Implement GPG api (#710)

* Implement GPG API

* Better handle error

* Apply review recommendation + simplify database operations

* Remove useless comments

models/error.go

@@ -245,6 +245,54 @@ func (err ErrKeyNameAlreadyUsed) Error() string {
 	return fmt.Sprintf("public key already exists [owner_id: %d, name: %s]", err.OwnerID, err.Name)
 }
 
+// ErrGPGKeyNotExist represents a "GPGKeyNotExist" kind of error.
+type ErrGPGKeyNotExist struct {
+	ID int64
+}
+
+// IsErrGPGKeyNotExist checks if an error is a ErrGPGKeyNotExist.
+func IsErrGPGKeyNotExist(err error) bool {
+	_, ok := err.(ErrGPGKeyNotExist)
+	return ok
+}
+
+func (err ErrGPGKeyNotExist) Error() string {
+	return fmt.Sprintf("public gpg key does not exist [id: %d]", err.ID)
+}
+
+// ErrGPGKeyIDAlreadyUsed represents a "GPGKeyIDAlreadyUsed" kind of error.
+type ErrGPGKeyIDAlreadyUsed struct {
+	KeyID string
+}
+
+// IsErrGPGKeyIDAlreadyUsed checks if an error is a ErrKeyNameAlreadyUsed.
+func IsErrGPGKeyIDAlreadyUsed(err error) bool {
+	_, ok := err.(ErrGPGKeyIDAlreadyUsed)
+	return ok
+}
+
+func (err ErrGPGKeyIDAlreadyUsed) Error() string {
+	return fmt.Sprintf("public key already exists [key_id: %s]", err.KeyID)
+}
+
+// ErrGPGKeyAccessDenied represents a "GPGKeyAccessDenied" kind of Error.
+type ErrGPGKeyAccessDenied struct {
+	UserID int64
+	KeyID  int64
+}
+
+// IsErrGPGKeyAccessDenied checks if an error is a ErrGPGKeyAccessDenied.
+func IsErrGPGKeyAccessDenied(err error) bool {
+	_, ok := err.(ErrGPGKeyAccessDenied)
+	return ok
+}
+
+// Error pretty-prints an error of type ErrGPGKeyAccessDenied.
+func (err ErrGPGKeyAccessDenied) Error() string {
+	return fmt.Sprintf("user does not have access to the key [user_id: %d, key_id: %d]",
+		err.UserID, err.KeyID)
+}
+
 // ErrKeyAccessDenied represents a "KeyAccessDenied" kind of error.
 type ErrKeyAccessDenied struct {
 	UserID int64

models/gpg_key.go

@@ -0,0 +1,276 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package models
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"strings"
+	"time"
+
+	"github.com/go-xorm/xorm"
+	"golang.org/x/crypto/openpgp"
+	"golang.org/x/crypto/openpgp/packet"
+)
+
+// GPGKey represents a GPG key.
+type GPGKey struct {
+	ID                int64     `xorm:"pk autoincr"`
+	OwnerID           int64     `xorm:"INDEX NOT NULL"`
+	KeyID             string    `xorm:"INDEX TEXT NOT NULL"`
+	PrimaryKeyID      string    `xorm:"TEXT"`
+	Content           string    `xorm:"TEXT NOT NULL"`
+	Created           time.Time `xorm:"-"`
+	CreatedUnix       int64
+	Expired           time.Time `xorm:"-"`
+	ExpiredUnix       int64
+	Added             time.Time `xorm:"-"`
+	AddedUnix         int64
+	SubsKey           []*GPGKey `xorm:"-"`
+	Emails            []*EmailAddress
+	CanSign           bool
+	CanEncryptComms   bool
+	CanEncryptStorage bool
+	CanCertify        bool
+}
+
+// BeforeInsert will be invoked by XORM before inserting a record
+func (key *GPGKey) BeforeInsert() {
+	key.AddedUnix = time.Now().Unix()
+	key.ExpiredUnix = key.Expired.Unix()
+	key.CreatedUnix = key.Created.Unix()
+}
+
+// AfterSet is invoked from XORM after setting the value of a field of this object.
+func (key *GPGKey) AfterSet(colName string, _ xorm.Cell) {
+	switch colName {
+	case "key_id":
+		x.Where("primary_key_id=?", key.KeyID).Find(&key.SubsKey)
+	case "added_unix":
+		key.Added = time.Unix(key.AddedUnix, 0).Local()
+	case "expired_unix":
+		key.Expired = time.Unix(key.ExpiredUnix, 0).Local()
+	case "created_unix":
+		key.Created = time.Unix(key.CreatedUnix, 0).Local()
+	}
+}
+
+// ListGPGKeys returns a list of public keys belongs to given user.
+func ListGPGKeys(uid int64) ([]*GPGKey, error) {
+	keys := make([]*GPGKey, 0, 5)
+	return keys, x.Where("owner_id=? AND primary_key_id=''", uid).Find(&keys)
+}
+
+// GetGPGKeyByID returns public key by given ID.
+func GetGPGKeyByID(keyID int64) (*GPGKey, error) {
+	key := new(GPGKey)
+	has, err := x.Id(keyID).Get(key)
+	if err != nil {
+		return nil, err
+	} else if !has {
+		return nil, ErrGPGKeyNotExist{keyID}
+	}
+	return key, nil
+}
+
+// checkArmoredGPGKeyString checks if the given key string is a valid GPG armored key.
+// The function returns the actual public key on success
+func checkArmoredGPGKeyString(content string) (*openpgp.Entity, error) {
+	list, err := openpgp.ReadArmoredKeyRing(strings.NewReader(content))
+	if err != nil {
+		return nil, err
+	}
+	return list[0], nil
+}
+
+//addGPGKey add key and subkeys to database
+func addGPGKey(e Engine, key *GPGKey) (err error) {
+	// Save GPG primary key.
+	if _, err = e.Insert(key); err != nil {
+		return err
+	}
+	// Save GPG subs key.
+	for _, subkey := range key.SubsKey {
+		if err := addGPGKey(e, subkey); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// AddGPGKey adds new public key to database.
+func AddGPGKey(ownerID int64, content string) (*GPGKey, error) {
+	ekey, err := checkArmoredGPGKeyString(content)
+	if err != nil {
+		return nil, err
+	}
+
+	// Key ID cannot be duplicated.
+	has, err := x.Where("key_id=?", ekey.PrimaryKey.KeyIdString()).
+		Get(new(GPGKey))
+	if err != nil {
+		return nil, err
+	} else if has {
+		return nil, ErrGPGKeyIDAlreadyUsed{ekey.PrimaryKey.KeyIdString()}
+	}
+
+	//Get DB session
+	sess := x.NewSession()
+	defer sessionRelease(sess)
+	if err = sess.Begin(); err != nil {
+		return nil, err
+	}
+
+	key, err := parseGPGKey(ownerID, ekey)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = addGPGKey(sess, key); err != nil {
+		return nil, err
+	}
+
+	return key, sess.Commit()
+}
+
+//base64EncPubKey encode public kay content to base 64
+func base64EncPubKey(pubkey *packet.PublicKey) (string, error) {
+	var w bytes.Buffer
+	err := pubkey.Serialize(&w)
+	if err != nil {
+		return "", err
+	}
+	return base64.StdEncoding.EncodeToString(w.Bytes()), nil
+}
+
+//parseSubGPGKey parse a sub Key
+func parseSubGPGKey(ownerID int64, primaryID string, pubkey *packet.PublicKey, expiry time.Time) (*GPGKey, error) {
+	content, err := base64EncPubKey(pubkey)
+	if err != nil {
+		return nil, err
+	}
+	return &GPGKey{
+		OwnerID:           ownerID,
+		KeyID:             pubkey.KeyIdString(),
+		PrimaryKeyID:      primaryID,
+		Content:           content,
+		Created:           pubkey.CreationTime,
+		Expired:           expiry,
+		CanSign:           pubkey.CanSign(),
+		CanEncryptComms:   pubkey.PubKeyAlgo.CanEncrypt(),
+		CanEncryptStorage: pubkey.PubKeyAlgo.CanEncrypt(),
+		CanCertify:        pubkey.PubKeyAlgo.CanSign(),
+	}, nil
+}
+
+//parseGPGKey parse a PrimaryKey entity (primary key + subs keys + self-signature)
+func parseGPGKey(ownerID int64, e *openpgp.Entity) (*GPGKey, error) {
+	pubkey := e.PrimaryKey
+
+	//Extract self-sign for expire date based on : https://github.com/golang/crypto/blob/master/openpgp/keys.go#L165
+	var selfSig *packet.Signature
+	for _, ident := range e.Identities {
+		if selfSig == nil {
+			selfSig = ident.SelfSignature
+		} else if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
+			selfSig = ident.SelfSignature
+			break
+		}
+	}
+	expiry := time.Time{}
+	if selfSig.KeyLifetimeSecs != nil {
+		expiry = selfSig.CreationTime.Add(time.Duration(*selfSig.KeyLifetimeSecs) * time.Second)
+	}
+
+	//Parse Subkeys
+	subkeys := make([]*GPGKey, len(e.Subkeys))
+	for i, k := range e.Subkeys {
+		subs, err := parseSubGPGKey(ownerID, pubkey.KeyIdString(), k.PublicKey, expiry)
+		if err != nil {
+			return nil, err
+		}
+		subkeys[i] = subs
+	}
+
+	//Check emails
+	userEmails, err := GetEmailAddresses(ownerID)
+	if err != nil {
+		return nil, err
+	}
+	emails := make([]*EmailAddress, len(e.Identities))
+	n := 0
+	for _, ident := range e.Identities {
+
+		for _, e := range userEmails {
+			if e.Email == ident.UserId.Email && e.IsActivated {
+				emails[n] = e
+				break
+			}
+		}
+		if emails[n] == nil {
+			return nil, fmt.Errorf("Failed to found email or is not confirmed : %s", ident.UserId.Email)
+		}
+		n++
+	}
+	content, err := base64EncPubKey(pubkey)
+	if err != nil {
+		return nil, err
+	}
+	return &GPGKey{
+		OwnerID:           ownerID,
+		KeyID:             pubkey.KeyIdString(),
+		PrimaryKeyID:      "",
+		Content:           content,
+		Created:           pubkey.CreationTime,
+		Expired:           expiry,
+		Emails:            emails,
+		SubsKey:           subkeys,
+		CanSign:           pubkey.CanSign(),
+		CanEncryptComms:   pubkey.PubKeyAlgo.CanEncrypt(),
+		CanEncryptStorage: pubkey.PubKeyAlgo.CanEncrypt(),
+		CanCertify:        pubkey.PubKeyAlgo.CanSign(),
+	}, nil
+}
+
+// deleteGPGKey does the actual key deletion
+func deleteGPGKey(e *xorm.Session, keyID string) (int64, error) {
+	if keyID == "" {
+		return 0, fmt.Errorf("empty KeyId forbidden") //Should never happen but just to be sure
+	}
+	return e.Where("key_id=?", keyID).Or("primary_key_id=?", keyID).Delete(new(GPGKey))
+}
+
+// DeleteGPGKey deletes GPG key information in database.
+func DeleteGPGKey(doer *User, id int64) (err error) {
+	key, err := GetGPGKeyByID(id)
+	if err != nil {
+		if IsErrGPGKeyNotExist(err) {
+			return nil
+		}
+		return fmt.Errorf("GetPublicKeyByID: %v", err)
+	}
+
+	// Check if user has access to delete this key.
+	if !doer.IsAdmin && doer.ID != key.OwnerID {
+		return ErrGPGKeyAccessDenied{doer.ID, key.ID}
+	}
+
+	sess := x.NewSession()
+	defer sessionRelease(sess)
+	if err = sess.Begin(); err != nil {
+		return err
+	}
+
+	if _, err = deleteGPGKey(sess, key.KeyID); err != nil {
+		return err
+	}
+
+	if err = sess.Commit(); err != nil {
+		return err
+	}
+
+	return nil
+}

models/gpg_key_test.go

@@ -0,0 +1,48 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package models
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCheckArmoredGPGKeyString(t *testing.T) {
+	testGPGArmor := `-----BEGIN PGP PUBLIC KEY BLOCK-----
+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+=i9b7
+-----END PGP PUBLIC KEY BLOCK-----`
+
+	key, err := checkArmoredGPGKeyString(testGPGArmor)
+	assert.Nil(t, err, "Could not parse a valid GPG armored key", key)
+	//TODO verify value of key
+}

models/models.go

@@ -111,6 +111,7 @@ func init() {
 		new(IssueUser),
 		new(LFSMetaObject),
 		new(TwoFactor),
+		new(GPGKey),
 		new(RepoUnit),
 		new(RepoRedirect),
 		new(ExternalLoginUser),

routers/api/v1/api.go

@@ -254,6 +254,7 @@ func RegisterRoutes(m *macaron.Macaron) {
 		m.Group("/users", func() {
 			m.Group("/:username", func() {
 				m.Get("/keys", user.ListPublicKeys)
+				m.Get("/gpg_keys", user.ListGPGKeys)
 
 				m.Get("/followers", user.ListFollowers)
 				m.Group("/following", func() {
@@ -286,6 +287,13 @@ func RegisterRoutes(m *macaron.Macaron) {
 					Delete(user.DeletePublicKey)
 			})
 
+			m.Group("/gpg_keys", func() {
+				m.Combo("").Get(user.ListMyGPGKeys).
+					Post(bind(api.CreateGPGKeyOption{}), user.CreateGPGKey)
+				m.Combo("/:id").Get(user.GetGPGKey).
+					Delete(user.DeleteGPGKey)
+			})
+
 			m.Combo("/repos").Get(user.ListMyRepos).
 				Post(bind(api.CreateRepoOption{}), repo.Create)
 

routers/api/v1/convert/convert.go

@@ -73,6 +73,51 @@ func ToPublicKey(apiLink string, key *models.PublicKey) *api.PublicKey {
 	}
 }
 
+// ToGPGKey converts models.GPGKey to api.GPGKey
+func ToGPGKey(key *models.GPGKey) *api.GPGKey {
+	subkeys := make([]*api.GPGKey, len(key.SubsKey))
+	for id, k := range key.SubsKey {
+		subkeys[id] = &api.GPGKey{
+			ID:                k.ID,
+			PrimaryKeyID:      k.PrimaryKeyID,
+			KeyID:             k.KeyID,
+			PublicKey:         k.Content,
+			Created:           k.Created,
+			Expires:           k.Expired,
+			CanSign:           k.CanSign,
+			CanEncryptComms:   k.CanEncryptComms,
+			CanEncryptStorage: k.CanEncryptStorage,
+			CanCertify:        k.CanSign,
+		}
+	}
+	emails := make([]*api.GPGKeyEmail, len(key.Emails))
+	for i, e := range key.Emails {
+		emails[i] = ToGPGKeyEmail(e)
+	}
+	return &api.GPGKey{
+		ID:                key.ID,
+		PrimaryKeyID:      key.PrimaryKeyID,
+		KeyID:             key.KeyID,
+		PublicKey:         key.Content,
+		Created:           key.Created,
+		Expires:           key.Expired,
+		Emails:            emails,
+		SubsKey:           subkeys,
+		CanSign:           key.CanSign,
+		CanEncryptComms:   key.CanEncryptComms,
+		CanEncryptStorage: key.CanEncryptStorage,
+		CanCertify:        key.CanSign,
+	}
+}
+
+// ToGPGKeyEmail convert models.EmailAddress to api.GPGKeyEmail
+func ToGPGKeyEmail(email *models.EmailAddress) *api.GPGKeyEmail {
+	return &api.GPGKeyEmail{
+		Email:    email.Email,
+		Verified: email.IsActivated,
+	}
+}
+
 // ToHook convert models.Webhook to api.Hook
 func ToHook(repoLink string, w *models.Webhook) *api.Hook {
 	config := map[string]string{

routers/api/v1/user/gpg_key.go

@@ -0,0 +1,102 @@
+// Copyright 2017 The Gitea Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package user
+
+import (
+	api "code.gitea.io/sdk/gitea"
+
+	"code.gitea.io/gitea/models"
+	"code.gitea.io/gitea/modules/context"
+	"code.gitea.io/gitea/modules/setting"
+	"code.gitea.io/gitea/routers/api/v1/convert"
+)
+
+func composePublicGPGKeysAPILink() string {
+	return setting.AppURL + "api/v1/user/gpg_keys/"
+}
+
+func listGPGKeys(ctx *context.APIContext, uid int64) {
+	keys, err := models.ListGPGKeys(uid)
+	if err != nil {
+		ctx.Error(500, "ListGPGKeys", err)
+		return
+	}
+
+	apiKeys := make([]*api.GPGKey, len(keys))
+	for i := range keys {
+		apiKeys[i] = convert.ToGPGKey(keys[i])
+	}
+
+	ctx.JSON(200, &apiKeys)
+}
+
+//ListGPGKeys get the GPG key list of a user
+func ListGPGKeys(ctx *context.APIContext) {
+	user := GetUserByParams(ctx)
+	if ctx.Written() {
+		return
+	}
+	listGPGKeys(ctx, user.ID)
+}
+
+//ListMyGPGKeys get the GPG key list of the logged user
+func ListMyGPGKeys(ctx *context.APIContext) {
+	listGPGKeys(ctx, ctx.User.ID)
+}
+
+//GetGPGKey get the GPG key based on a id
+func GetGPGKey(ctx *context.APIContext) {
+	key, err := models.GetGPGKeyByID(ctx.ParamsInt64(":id"))
+	if err != nil {
+		if models.IsErrGPGKeyNotExist(err) {
+			ctx.Status(404)
+		} else {
+			ctx.Error(500, "GetGPGKeyByID", err)
+		}
+		return
+	}
+	ctx.JSON(200, convert.ToGPGKey(key))
+}
+
+// CreateUserGPGKey creates new GPG key to given user by ID.
+func CreateUserGPGKey(ctx *context.APIContext, form api.CreateGPGKeyOption, uid int64) {
+	key, err := models.AddGPGKey(uid, form.ArmoredKey)
+	if err != nil {
+		HandleAddGPGKeyError(ctx, err)
+		return
+	}
+	ctx.JSON(201, convert.ToGPGKey(key))
+}
+
+//CreateGPGKey associate a GPG key to the current user
+func CreateGPGKey(ctx *context.APIContext, form api.CreateGPGKeyOption) {
+	CreateUserGPGKey(ctx, form, ctx.User.ID)
+}
+
+//DeleteGPGKey remove a GPG key associated to the current user
+func DeleteGPGKey(ctx *context.APIContext) {
+	if err := models.DeleteGPGKey(ctx.User, ctx.ParamsInt64(":id")); err != nil {
+		if models.IsErrGPGKeyAccessDenied(err) {
+			ctx.Error(403, "", "You do not have access to this key")
+		} else {
+			ctx.Error(500, "DeleteGPGKey", err)
+		}
+		return
+	}
+
+	ctx.Status(204)
+}
+
+// HandleAddGPGKeyError handle add GPGKey error
+func HandleAddGPGKeyError(ctx *context.APIContext, err error) {
+	switch {
+	case models.IsErrGPGKeyAccessDenied(err):
+		ctx.Error(422, "", "You do not have access to this gpg key")
+	case models.IsErrGPGKeyIDAlreadyUsed(err):
+		ctx.Error(422, "", "A key with the same keyid is allready in database")
+	default:
+		ctx.Error(500, "AddGPGKey", err)
+	}
+}

vendor/golang.org/x/crypto/cast5/cast5.go

@@ -0,0 +1,526 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package cast5 implements CAST5, as defined in RFC 2144. CAST5 is a common
+// OpenPGP cipher.
+package cast5 // import "golang.org/x/crypto/cast5"
+
+import "errors"
+
+const BlockSize = 8
+const KeySize = 16
+
+type Cipher struct {
+	masking [16]uint32
+	rotate  [16]uint8
+}
+
+func NewCipher(key []byte) (c *Cipher, err error) {
+	if len(key) != KeySize {
+		return nil, errors.New("CAST5: keys must be 16 bytes")
+	}
+
+	c = new(Cipher)
+	c.keySchedule(key)
+	return
+}
+
+func (c *Cipher) BlockSize() int {
+	return BlockSize
+}
+
+func (c *Cipher) Encrypt(dst, src []byte) {
+	l := uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3])
+	r := uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7])
+
+	l, r = r, l^f1(r, c.masking[0], c.rotate[0])
+	l, r = r, l^f2(r, c.masking[1], c.rotate[1])
+	l, r = r, l^f3(r, c.masking[2], c.rotate[2])
+	l, r = r, l^f1(r, c.masking[3], c.rotate[3])
+
+	l, r = r, l^f2(r, c.masking[4], c.rotate[4])
+	l, r = r, l^f3(r, c.masking[5], c.rotate[5])
+	l, r = r, l^f1(r, c.masking[6], c.rotate[6])
+	l, r = r, l^f2(r, c.masking[7], c.rotate[7])
+
+	l, r = r, l^f3(r, c.masking[8], c.rotate[8])
+	l, r = r, l^f1(r, c.masking[9], c.rotate[9])
+	l, r = r, l^f2(r, c.masking[10], c.rotate[10])
+	l, r = r, l^f3(r, c.masking[11], c.rotate[11])
+
+	l, r = r, l^f1(r, c.masking[12], c.rotate[12])
+	l, r = r, l^f2(r, c.masking[13], c.rotate[13])
+	l, r = r, l^f3(r, c.masking[14], c.rotate[14])
+	l, r = r, l^f1(r, c.masking[15], c.rotate[15])
+
+	dst[0] = uint8(r >> 24)
+	dst[1] = uint8(r >> 16)
+	dst[2] = uint8(r >> 8)
+	dst[3] = uint8(r)
+	dst[4] = uint8(l >> 24)
+	dst[5] = uint8(l >> 16)
+	dst[6] = uint8(l >> 8)
+	dst[7] = uint8(l)
+}
+
+func (c *Cipher) Decrypt(dst, src []byte) {
+	l := uint32(src[0])<<24 | uint32(src[1])<<16 | uint32(src[2])<<8 | uint32(src[3])
+	r := uint32(src[4])<<24 | uint32(src[5])<<16 | uint32(src[6])<<8 | uint32(src[7])
+
+	l, r = r, l^f1(r, c.masking[15], c.rotate[15])
+	l, r = r, l^f3(r, c.masking[14], c.rotate[14])
+	l, r = r, l^f2(r, c.masking[13], c.rotate[13])
+	l, r = r, l^f1(r, c.masking[12], c.rotate[12])
+
+	l, r = r, l^f3(r, c.masking[11], c.rotate[11])
+	l, r = r, l^f2(r, c.masking[10], c.rotate[10])
+	l, r = r, l^f1(r, c.masking[9], c.rotate[9])
+	l, r = r, l^f3(r, c.masking[8], c.rotate[8])
+
+	l, r = r, l^f2(r, c.masking[7], c.rotate[7])
+	l, r = r, l^f1(r, c.masking[6], c.rotate[6])
+	l, r = r, l^f3(r, c.masking[5], c.rotate[5])
+	l, r = r, l^f2(r, c.masking[4], c.rotate[4])
+
+	l, r = r, l^f1(r, c.masking[3], c.rotate[3])
+	l, r = r, l^f3(r, c.masking[2], c.rotate[2])
+	l, r = r, l^f2(r, c.masking[1], c.rotate[1])
+	l, r = r, l^f1(r, c.masking[0], c.rotate[0])
+
+	dst[0] = uint8(r >> 24)
+	dst[1] = uint8(r >> 16)
+	dst[2] = uint8(r >> 8)
+	dst[3] = uint8(r)
+	dst[4] = uint8(l >> 24)
+	dst[5] = uint8(l >> 16)
+	dst[6] = uint8(l >> 8)
+	dst[7] = uint8(l)
+}
+
+type keyScheduleA [4][7]uint8
+type keyScheduleB [4][5]uint8
+
+// keyScheduleRound contains the magic values for a round of the key schedule.
+// The keyScheduleA deals with the lines like:
+//   z0z1z2z3 = x0x1x2x3 ^ S5[xD] ^ S6[xF] ^ S7[xC] ^ S8[xE] ^ S7[x8]
+// Conceptually, both x and z are in the same array, x first. The first
+// element describes which word of this array gets written to and the
+// second, which word gets read. So, for the line above, it's "4, 0", because
+// it's writing to the first word of z, which, being after x, is word 4, and
+// reading from the first word of x: word 0.
+//
+// Next are the indexes into the S-boxes. Now the array is treated as bytes. So
+// "xD" is 0xd. The first byte of z is written as "16 + 0", just to be clear
+// that it's z that we're indexing.
+//
+// keyScheduleB deals with lines like:
+//   K1 = S5[z8] ^ S6[z9] ^ S7[z7] ^ S8[z6] ^ S5[z2]
+// "K1" is ignored because key words are always written in order. So the five
+// elements are the S-box indexes. They use the same form as in keyScheduleA,
+// above.
+
+type keyScheduleRound struct{}
+type keySchedule []keyScheduleRound
+
+var schedule = []struct {
+	a keyScheduleA
+	b keyScheduleB
+}{
+	{
+		keyScheduleA{
+			{4, 0, 0xd, 0xf, 0xc, 0xe, 0x8},
+			{5, 2, 16 + 0, 16 + 2, 16 + 1, 16 + 3, 0xa},
+			{6, 3, 16 + 7, 16 + 6, 16 + 5, 16 + 4, 9},
+			{7, 1, 16 + 0xa, 16 + 9, 16 + 0xb, 16 + 8, 0xb},
+		},
+		keyScheduleB{
+			{16 + 8, 16 + 9, 16 + 7, 16 + 6, 16 + 2},
+			{16 + 0xa, 16 + 0xb, 16 + 5, 16 + 4, 16 + 6},
+			{16 + 0xc, 16 + 0xd, 16 + 3, 16 + 2, 16 + 9},
+			{16 + 0xe, 16 + 0xf, 16 + 1, 16 + 0, 16 + 0xc},
+		},
+	},
+	{
+		keyScheduleA{
+			{0, 6, 16 + 5, 16 + 7, 16 + 4, 16 + 6, 16 + 0},
+			{1, 4, 0, 2, 1, 3, 16 + 2},
+			{2, 5, 7, 6, 5, 4, 16 + 1},
+			{3, 7, 0xa, 9, 0xb, 8, 16 + 3},
+		},
+		keyScheduleB{
+			{3, 2, 0xc, 0xd, 8},
+			{1, 0, 0xe, 0xf, 0xd},
+			{7, 6, 8, 9, 3},
+			{5, 4, 0xa, 0xb, 7},
+		},
+	},
+	{
+		keyScheduleA{
+			{4, 0, 0xd, 0xf, 0xc, 0xe, 8},
+			{5, 2, 16 + 0, 16 + 2, 16 + 1, 16 + 3, 0xa},
+			{6, 3, 16 + 7, 16 + 6, 16 + 5, 16 + 4, 9},
+			{7, 1, 16 + 0xa, 16 + 9, 16 + 0xb, 16 + 8, 0xb},
+		},
+		keyScheduleB{
+			{16 + 3, 16 + 2, 16 + 0xc, 16 + 0xd, 16 + 9},
+			{16 + 1, 16 + 0, 16 + 0xe, 16 + 0xf, 16 + 0xc},
+			{16 + 7, 16 + 6, 16 + 8, 16 + 9, 16 + 2},
+			{16 + 5, 16 + 4, 16 + 0xa, 16 + 0xb, 16 + 6},
+		},
+	},
+	{
+		keyScheduleA{
+			{0, 6, 16 + 5, 16 + 7, 16 + 4, 16 + 6, 16 + 0},
+			{1, 4, 0, 2, 1, 3, 16 + 2},
+			{2, 5, 7, 6, 5, 4, 16 + 1},
+			{3, 7, 0xa, 9, 0xb, 8, 16 + 3},
+		},
+		keyScheduleB{
+			{8, 9, 7, 6, 3},
+			{0xa, 0xb, 5, 4, 7},
+			{0xc, 0xd, 3, 2, 8},
+			{0xe, 0xf, 1, 0, 0xd},
+		},
+	},
+}
+
+func (c *Cipher) keySchedule(in []byte) {
+	var t [8]uint32
+	var k [32]uint32
+
+	for i := 0; i < 4; i++ {
+		j := i * 4
+		t[i] = uint32(in[j])<<24 | uint32(in[j+1])<<16 | uint32(in[j+2])<<8 | uint32(in[j+3])
+	}
+
+	x := []byte{6, 7, 4, 5}
+	ki := 0
+
+	for half := 0; half < 2; half++ {
+		for _, round := range schedule {
+			for j := 0; j < 4; j++ {
+				var a [7]uint8
+				copy(a[:], round.a[j][:])
+				w := t[a[1]]
+				w ^= sBox[4][(t[a[2]>>2]>>(24-8*(a[2]&3)))&0xff]
+				w ^= sBox[5][(t[a[3]>>2]>>(24-8*(a[3]&3)))&0xff]
+				w ^= sBox[6][(t[a[4]>>2]>>(24-8*(a[4]&3)))&0xff]
+				w ^= sBox[7][(t[a[5]>>2]>>(24-8*(a[5]&3)))&0xff]
+				w ^= sBox[x[j]][(t[a[6]>>2]>>(24-8*(a[6]&3)))&0xff]
+				t[a[0]] = w
+			}
+
+			for j := 0; j < 4; j++ {
+				var b [5]uint8
+				copy(b[:], round.b[j][:])
+				w := sBox[4][(t[b[0]>>2]>>(24-8*(b[0]&3)))&0xff]
+				w ^= sBox[5][(t[b[1]>>2]>>(24-8*(b[1]&3)))&0xff]
+				w ^= sBox[6][(t[b[2]>>2]>>(24-8*(b[2]&3)))&0xff]
+				w ^= sBox[7][(t[b[3]>>2]>>(24-8*(b[3]&3)))&0xff]
+				w ^= sBox[4+j][(t[b[4]>>2]>>(24-8*(b[4]&3)))&0xff]
+				k[ki] = w
+				ki++
+			}
+		}
+	}
+
+	for i := 0; i < 16; i++ {
+		c.masking[i] = k[i]
+		c.rotate[i] = uint8(k[16+i] & 0x1f)
+	}
+}
+
+// These are the three 'f' functions. See RFC 2144, section 2.2.
+func f1(d, m uint32, r uint8) uint32 {
+	t := m + d
+	I := (t << r) | (t >> (32 - r))
+	return ((sBox[0][I>>24] ^ sBox[1][(I>>16)&0xff]) - sBox[2][(I>>8)&0xff]) + sBox[3][I&0xff]
+}
+
+func f2(d, m uint32, r uint8) uint32 {
+	t := m ^ d
+	I := (t << r) | (t >> (32 - r))
+	return ((sBox[0][I>>24] - sBox[1][(I>>16)&0xff]) + sBox[2][(I>>8)&0xff]) ^ sBox[3][I&0xff]
+}
+
+func f3(d, m uint32, r uint8) uint32 {
+	t := m - d
+	I := (t << r) | (t >> (32 - r))
+	return ((sBox[0][I>>24] + sBox[1][(I>>16)&0xff]) ^ sBox[2][(I>>8)&0xff]) - sBox[3][I&0xff]
+}
+
+var sBox = [8][256]uint32{
+	{
+		0x30fb40d4, 0x9fa0ff0b, 0x6beccd2f, 0x3f258c7a, 0x1e213f2f, 0x9c004dd3, 0x6003e540, 0xcf9fc949,
+		0xbfd4af27, 0x88bbbdb5, 0xe2034090, 0x98d09675, 0x6e63a0e0, 0x15c361d2, 0xc2e7661d, 0x22d4ff8e,
+		0x28683b6f, 0xc07fd059, 0xff2379c8, 0x775f50e2, 0x43c340d3, 0xdf2f8656, 0x887ca41a, 0xa2d2bd2d,
+		0xa1c9e0d6, 0x346c4819, 0x61b76d87, 0x22540f2f, 0x2abe32e1, 0xaa54166b, 0x22568e3a, 0xa2d341d0,
+		0x66db40c8, 0xa784392f, 0x004dff2f, 0x2db9d2de, 0x97943fac, 0x4a97c1d8, 0x527644b7, 0xb5f437a7,
+		0xb82cbaef, 0xd751d159, 0x6ff7f0ed, 0x5a097a1f, 0x827b68d0, 0x90ecf52e, 0x22b0c054, 0xbc8e5935,
+		0x4b6d2f7f, 0x50bb64a2, 0xd2664910, 0xbee5812d, 0xb7332290, 0xe93b159f, 0xb48ee411, 0x4bff345d,
+		0xfd45c240, 0xad31973f, 0xc4f6d02e, 0x55fc8165, 0xd5b1caad, 0xa1ac2dae, 0xa2d4b76d, 0xc19b0c50,
+		0x882240f2, 0x0c6e4f38, 0xa4e4bfd7, 0x4f5ba272, 0x564c1d2f, 0xc59c5319, 0xb949e354, 0xb04669fe,
+		0xb1b6ab8a, 0xc71358dd, 0x6385c545, 0x110f935d, 0x57538ad5, 0x6a390493, 0xe63d37e0, 0x2a54f6b3,
+		0x3a787d5f, 0x6276a0b5, 0x19a6fcdf, 0x7a42206a, 0x29f9d4d5, 0xf61b1891, 0xbb72275e, 0xaa508167,
+		0x38901091, 0xc6b505eb, 0x84c7cb8c, 0x2ad75a0f, 0x874a1427, 0xa2d1936b, 0x2ad286af, 0xaa56d291,
+		0xd7894360, 0x425c750d, 0x93b39e26, 0x187184c9, 0x6c00b32d, 0x73e2bb14, 0xa0bebc3c, 0x54623779,
+		0x64459eab, 0x3f328b82, 0x7718cf82, 0x59a2cea6, 0x04ee002e, 0x89fe78e6, 0x3fab0950, 0x325ff6c2,
+		0x81383f05, 0x6963c5c8, 0x76cb5ad6, 0xd49974c9, 0xca180dcf, 0x380782d5, 0xc7fa5cf6, 0x8ac31511,
+		0x35e79e13, 0x47da91d0, 0xf40f9086, 0xa7e2419e, 0x31366241, 0x051ef495, 0xaa573b04, 0x4a805d8d,
+		0x548300d0, 0x00322a3c, 0xbf64cddf, 0xba57a68e, 0x75c6372b, 0x50afd341, 0xa7c13275, 0x915a0bf5,
+		0x6b54bfab, 0x2b0b1426, 0xab4cc9d7, 0x449ccd82, 0xf7fbf265, 0xab85c5f3, 0x1b55db94, 0xaad4e324,
+		0xcfa4bd3f, 0x2deaa3e2, 0x9e204d02, 0xc8bd25ac, 0xeadf55b3, 0xd5bd9e98, 0xe31231b2, 0x2ad5ad6c,
+		0x954329de, 0xadbe4528, 0xd8710f69, 0xaa51c90f, 0xaa786bf6, 0x22513f1e, 0xaa51a79b, 0x2ad344cc,
+		0x7b5a41f0, 0xd37cfbad, 0x1b069505, 0x41ece491, 0xb4c332e6, 0x032268d4, 0xc9600acc, 0xce387e6d,
+		0xbf6bb16c, 0x6a70fb78, 0x0d03d9c9, 0xd4df39de, 0xe01063da, 0x4736f464, 0x5ad328d8, 0xb347cc96,
+		0x75bb0fc3, 0x98511bfb, 0x4ffbcc35, 0xb58bcf6a, 0xe11f0abc, 0xbfc5fe4a, 0xa70aec10, 0xac39570a,
+		0x3f04442f, 0x6188b153, 0xe0397a2e, 0x5727cb79, 0x9ceb418f, 0x1cacd68d, 0x2ad37c96, 0x0175cb9d,
+		0xc69dff09, 0xc75b65f0, 0xd9db40d8, 0xec0e7779, 0x4744ead4, 0xb11c3274, 0xdd24cb9e, 0x7e1c54bd,
+		0xf01144f9, 0xd2240eb1, 0x9675b3fd, 0xa3ac3755, 0xd47c27af, 0x51c85f4d, 0x56907596, 0xa5bb15e6,
+		0x580304f0, 0xca042cf1, 0x011a37ea, 0x8dbfaadb, 0x35ba3e4a, 0x3526ffa0, 0xc37b4d09, 0xbc306ed9,
+		0x98a52666, 0x5648f725, 0xff5e569d, 0x0ced63d0, 0x7c63b2cf, 0x700b45e1, 0xd5ea50f1, 0x85a92872,
+		0xaf1fbda7, 0xd4234870, 0xa7870bf3, 0x2d3b4d79, 0x42e04198, 0x0cd0ede7, 0x26470db8, 0xf881814c,
+		0x474d6ad7, 0x7c0c5e5c, 0xd1231959, 0x381b7298, 0xf5d2f4db, 0xab838653, 0x6e2f1e23, 0x83719c9e,
+		0xbd91e046, 0x9a56456e, 0xdc39200c, 0x20c8c571, 0x962bda1c, 0xe1e696ff, 0xb141ab08, 0x7cca89b9,
+		0x1a69e783, 0x02cc4843, 0xa2f7c579, 0x429ef47d, 0x427b169c, 0x5ac9f049, 0xdd8f0f00, 0x5c8165bf,
+	},
+	{
+		0x1f201094, 0xef0ba75b, 0x69e3cf7e, 0x393f4380, 0xfe61cf7a, 0xeec5207a, 0x55889c94, 0x72fc0651,
+		0xada7ef79, 0x4e1d7235, 0xd55a63ce, 0xde0436ba, 0x99c430ef, 0x5f0c0794, 0x18dcdb7d, 0xa1d6eff3,
+		0xa0b52f7b, 0x59e83605, 0xee15b094, 0xe9ffd909, 0xdc440086, 0xef944459, 0xba83ccb3, 0xe0c3cdfb,
+		0xd1da4181, 0x3b092ab1, 0xf997f1c1, 0xa5e6cf7b, 0x01420ddb, 0xe4e7ef5b, 0x25a1ff41, 0xe180f806,
+		0x1fc41080, 0x179bee7a, 0xd37ac6a9, 0xfe5830a4, 0x98de8b7f, 0x77e83f4e, 0x79929269, 0x24fa9f7b,
+		0xe113c85b, 0xacc40083, 0xd7503525, 0xf7ea615f, 0x62143154, 0x0d554b63, 0x5d681121, 0xc866c359,
+		0x3d63cf73, 0xcee234c0, 0xd4d87e87, 0x5c672b21, 0x071f6181, 0x39f7627f, 0x361e3084, 0xe4eb573b,
+		0x602f64a4, 0xd63acd9c, 0x1bbc4635, 0x9e81032d, 0x2701f50c, 0x99847ab4, 0xa0e3df79, 0xba6cf38c,
+		0x10843094, 0x2537a95e, 0xf46f6ffe, 0xa1ff3b1f, 0x208cfb6a, 0x8f458c74, 0xd9e0a227, 0x4ec73a34,
+		0xfc884f69, 0x3e4de8df, 0xef0e0088, 0x3559648d, 0x8a45388c, 0x1d804366, 0x721d9bfd, 0xa58684bb,
+		0xe8256333, 0x844e8212, 0x128d8098, 0xfed33fb4, 0xce280ae1, 0x27e19ba5, 0xd5a6c252, 0xe49754bd,
+		0xc5d655dd, 0xeb667064, 0x77840b4d, 0xa1b6a801, 0x84db26a9, 0xe0b56714, 0x21f043b7, 0xe5d05860,
+		0x54f03084, 0x066ff472, 0xa31aa153, 0xdadc4755, 0xb5625dbf, 0x68561be6, 0x83ca6b94, 0x2d6ed23b,
+		0xeccf01db, 0xa6d3d0ba, 0xb6803d5c, 0xaf77a709, 0x33b4a34c, 0x397bc8d6, 0x5ee22b95, 0x5f0e5304,
+		0x81ed6f61, 0x20e74364, 0xb45e1378, 0xde18639b, 0x881ca122, 0xb96726d1, 0x8049a7e8, 0x22b7da7b,
+		0x5e552d25, 0x5272d237, 0x79d2951c, 0xc60d894c, 0x488cb402, 0x1ba4fe5b, 0xa4b09f6b, 0x1ca815cf,
+		0xa20c3005, 0x8871df63, 0xb9de2fcb, 0x0cc6c9e9, 0x0beeff53, 0xe3214517, 0xb4542835, 0x9f63293c,
+		0xee41e729, 0x6e1d2d7c, 0x50045286, 0x1e6685f3, 0xf33401c6, 0x30a22c95, 0x31a70850, 0x60930f13,
+		0x73f98417, 0xa1269859, 0xec645c44, 0x52c877a9, 0xcdff33a6, 0xa02b1741, 0x7cbad9a2, 0x2180036f,
+		0x50d99c08, 0xcb3f4861, 0xc26bd765, 0x64a3f6ab, 0x80342676, 0x25a75e7b, 0xe4e6d1fc, 0x20c710e6,
+		0xcdf0b680, 0x17844d3b, 0x31eef84d, 0x7e0824e4, 0x2ccb49eb, 0x846a3bae, 0x8ff77888, 0xee5d60f6,
+		0x7af75673, 0x2fdd5cdb, 0xa11631c1, 0x30f66f43, 0xb3faec54, 0x157fd7fa, 0xef8579cc, 0xd152de58,
+		0xdb2ffd5e, 0x8f32ce19, 0x306af97a, 0x02f03ef8, 0x99319ad5, 0xc242fa0f, 0xa7e3ebb0, 0xc68e4906,
+		0xb8da230c, 0x80823028, 0xdcdef3c8, 0xd35fb171, 0x088a1bc8, 0xbec0c560, 0x61a3c9e8, 0xbca8f54d,
+		0xc72feffa, 0x22822e99, 0x82c570b4, 0xd8d94e89, 0x8b1c34bc, 0x301e16e6, 0x273be979, 0xb0ffeaa6,
+		0x61d9b8c6, 0x00b24869, 0xb7ffce3f, 0x08dc283b, 0x43daf65a, 0xf7e19798, 0x7619b72f, 0x8f1c9ba4,
+		0xdc8637a0, 0x16a7d3b1, 0x9fc393b7, 0xa7136eeb, 0xc6bcc63e, 0x1a513742, 0xef6828bc, 0x520365d6,
+		0x2d6a77ab, 0x3527ed4b, 0x821fd216, 0x095c6e2e, 0xdb92f2fb, 0x5eea29cb, 0x145892f5, 0x91584f7f,
+		0x5483697b, 0x2667a8cc, 0x85196048, 0x8c4bacea, 0x833860d4, 0x0d23e0f9, 0x6c387e8a, 0x0ae6d249,
+		0xb284600c, 0xd835731d, 0xdcb1c647, 0xac4c56ea, 0x3ebd81b3, 0x230eabb0, 0x6438bc87, 0xf0b5b1fa,
+		0x8f5ea2b3, 0xfc184642, 0x0a036b7a, 0x4fb089bd, 0x649da589, 0xa345415e, 0x5c038323, 0x3e5d3bb9,
+		0x43d79572, 0x7e6dd07c, 0x06dfdf1e, 0x6c6cc4ef, 0x7160a539, 0x73bfbe70, 0x83877605, 0x4523ecf1,
+	},
+	{
+		0x8defc240, 0x25fa5d9f, 0xeb903dbf, 0xe810c907, 0x47607fff, 0x369fe44b, 0x8c1fc644, 0xaececa90,
+		0xbeb1f9bf, 0xeefbcaea, 0xe8cf1950, 0x51df07ae, 0x920e8806, 0xf0ad0548, 0xe13c8d83, 0x927010d5,
+		0x11107d9f, 0x07647db9, 0xb2e3e4d4, 0x3d4f285e, 0xb9afa820, 0xfade82e0, 0xa067268b, 0x8272792e,
+		0x553fb2c0, 0x489ae22b, 0xd4ef9794, 0x125e3fbc, 0x21fffcee, 0x825b1bfd, 0x9255c5ed, 0x1257a240,
+		0x4e1a8302, 0xbae07fff, 0x528246e7, 0x8e57140e, 0x3373f7bf, 0x8c9f8188, 0xa6fc4ee8, 0xc982b5a5,
+		0xa8c01db7, 0x579fc264, 0x67094f31, 0xf2bd3f5f, 0x40fff7c1, 0x1fb78dfc, 0x8e6bd2c1, 0x437be59b,
+		0x99b03dbf, 0xb5dbc64b, 0x638dc0e6, 0x55819d99, 0xa197c81c, 0x4a012d6e, 0xc5884a28, 0xccc36f71,
+		0xb843c213, 0x6c0743f1, 0x8309893c, 0x0feddd5f, 0x2f7fe850, 0xd7c07f7e, 0x02507fbf, 0x5afb9a04,
+		0xa747d2d0, 0x1651192e, 0xaf70bf3e, 0x58c31380, 0x5f98302e, 0x727cc3c4, 0x0a0fb402, 0x0f7fef82,
+		0x8c96fdad, 0x5d2c2aae, 0x8ee99a49, 0x50da88b8, 0x8427f4a0, 0x1eac5790, 0x796fb449, 0x8252dc15,
+		0xefbd7d9b, 0xa672597d, 0xada840d8, 0x45f54504, 0xfa5d7403, 0xe83ec305, 0x4f91751a, 0x925669c2,
+		0x23efe941, 0xa903f12e, 0x60270df2, 0x0276e4b6, 0x94fd6574, 0x927985b2, 0x8276dbcb, 0x02778176,
+		0xf8af918d, 0x4e48f79e, 0x8f616ddf, 0xe29d840e, 0x842f7d83, 0x340ce5c8, 0x96bbb682, 0x93b4b148,
+		0xef303cab, 0x984faf28, 0x779faf9b, 0x92dc560d, 0x224d1e20, 0x8437aa88, 0x7d29dc96, 0x2756d3dc,
+		0x8b907cee, 0xb51fd240, 0xe7c07ce3, 0xe566b4a1, 0xc3e9615e, 0x3cf8209d, 0x6094d1e3, 0xcd9ca341,
+		0x5c76460e, 0x00ea983b, 0xd4d67881, 0xfd47572c, 0xf76cedd9, 0xbda8229c, 0x127dadaa, 0x438a074e,
+		0x1f97c090, 0x081bdb8a, 0x93a07ebe, 0xb938ca15, 0x97b03cff, 0x3dc2c0f8, 0x8d1ab2ec, 0x64380e51,
+		0x68cc7bfb, 0xd90f2788, 0x12490181, 0x5de5ffd4, 0xdd7ef86a, 0x76a2e214, 0xb9a40368, 0x925d958f,
+		0x4b39fffa, 0xba39aee9, 0xa4ffd30b, 0xfaf7933b, 0x6d498623, 0x193cbcfa, 0x27627545, 0x825cf47a,
+		0x61bd8ba0, 0xd11e42d1, 0xcead04f4, 0x127ea392, 0x10428db7, 0x8272a972, 0x9270c4a8, 0x127de50b,
+		0x285ba1c8, 0x3c62f44f, 0x35c0eaa5, 0xe805d231, 0x428929fb, 0xb4fcdf82, 0x4fb66a53, 0x0e7dc15b,
+		0x1f081fab, 0x108618ae, 0xfcfd086d, 0xf9ff2889, 0x694bcc11, 0x236a5cae, 0x12deca4d, 0x2c3f8cc5,
+		0xd2d02dfe, 0xf8ef5896, 0xe4cf52da, 0x95155b67, 0x494a488c, 0xb9b6a80c, 0x5c8f82bc, 0x89d36b45,
+		0x3a609437, 0xec00c9a9, 0x44715253, 0x0a874b49, 0xd773bc40, 0x7c34671c, 0x02717ef6, 0x4feb5536,
+		0xa2d02fff, 0xd2bf60c4, 0xd43f03c0, 0x50b4ef6d, 0x07478cd1, 0x006e1888, 0xa2e53f55, 0xb9e6d4bc,
+		0xa2048016, 0x97573833, 0xd7207d67, 0xde0f8f3d, 0x72f87b33, 0xabcc4f33, 0x7688c55d, 0x7b00a6b0,
+		0x947b0001, 0x570075d2, 0xf9bb88f8, 0x8942019e, 0x4264a5ff, 0x856302e0, 0x72dbd92b, 0xee971b69,
+		0x6ea22fde, 0x5f08ae2b, 0xaf7a616d, 0xe5c98767, 0xcf1febd2, 0x61efc8c2, 0xf1ac2571, 0xcc8239c2,
+		0x67214cb8, 0xb1e583d1, 0xb7dc3e62, 0x7f10bdce, 0xf90a5c38, 0x0ff0443d, 0x606e6dc6, 0x60543a49,
+		0x5727c148, 0x2be98a1d, 0x8ab41738, 0x20e1be24, 0xaf96da0f, 0x68458425, 0x99833be5, 0x600d457d,
+		0x282f9350, 0x8334b362, 0xd91d1120, 0x2b6d8da0, 0x642b1e31, 0x9c305a00, 0x52bce688, 0x1b03588a,
+		0xf7baefd5, 0x4142ed9c, 0xa4315c11, 0x83323ec5, 0xdfef4636, 0xa133c501, 0xe9d3531c, 0xee353783,
+	},
+	{
+		0x9db30420, 0x1fb6e9de, 0xa7be7bef, 0xd273a298, 0x4a4f7bdb, 0x64ad8c57, 0x85510443, 0xfa020ed1,
+		0x7e287aff, 0xe60fb663, 0x095f35a1, 0x79ebf120, 0xfd059d43, 0x6497b7b1, 0xf3641f63, 0x241e4adf,
+		0x28147f5f, 0x4fa2b8cd, 0xc9430040, 0x0cc32220, 0xfdd30b30, 0xc0a5374f, 0x1d2d00d9, 0x24147b15,
+		0xee4d111a, 0x0fca5167, 0x71ff904c, 0x2d195ffe, 0x1a05645f, 0x0c13fefe, 0x081b08ca, 0x05170121,
+		0x80530100, 0xe83e5efe, 0xac9af4f8, 0x7fe72701, 0xd2b8ee5f, 0x06df4261, 0xbb9e9b8a, 0x7293ea25,
+		0xce84ffdf, 0xf5718801, 0x3dd64b04, 0xa26f263b, 0x7ed48400, 0x547eebe6, 0x446d4ca0, 0x6cf3d6f5,
+		0x2649abdf, 0xaea0c7f5, 0x36338cc1, 0x503f7e93, 0xd3772061, 0x11b638e1, 0x72500e03, 0xf80eb2bb,
+		0xabe0502e, 0xec8d77de, 0x57971e81, 0xe14f6746, 0xc9335400, 0x6920318f, 0x081dbb99, 0xffc304a5,
+		0x4d351805, 0x7f3d5ce3, 0xa6c866c6, 0x5d5bcca9, 0xdaec6fea, 0x9f926f91, 0x9f46222f, 0x3991467d,
+		0xa5bf6d8e, 0x1143c44f, 0x43958302, 0xd0214eeb, 0x022083b8, 0x3fb6180c, 0x18f8931e, 0x281658e6,
+		0x26486e3e, 0x8bd78a70, 0x7477e4c1, 0xb506e07c, 0xf32d0a25, 0x79098b02, 0xe4eabb81, 0x28123b23,
+		0x69dead38, 0x1574ca16, 0xdf871b62, 0x211c40b7, 0xa51a9ef9, 0x0014377b, 0x041e8ac8, 0x09114003,
+		0xbd59e4d2, 0xe3d156d5, 0x4fe876d5, 0x2f91a340, 0x557be8de, 0x00eae4a7, 0x0ce5c2ec, 0x4db4bba6,
+		0xe756bdff, 0xdd3369ac, 0xec17b035, 0x06572327, 0x99afc8b0, 0x56c8c391, 0x6b65811c, 0x5e146119,
+		0x6e85cb75, 0xbe07c002, 0xc2325577, 0x893ff4ec, 0x5bbfc92d, 0xd0ec3b25, 0xb7801ab7, 0x8d6d3b24,
+		0x20c763ef, 0xc366a5fc, 0x9c382880, 0x0ace3205, 0xaac9548a, 0xeca1d7c7, 0x041afa32, 0x1d16625a,
+		0x6701902c, 0x9b757a54, 0x31d477f7, 0x9126b031, 0x36cc6fdb, 0xc70b8b46, 0xd9e66a48, 0x56e55a79,
+		0x026a4ceb, 0x52437eff, 0x2f8f76b4, 0x0df980a5, 0x8674cde3, 0xedda04eb, 0x17a9be04, 0x2c18f4df,
+		0xb7747f9d, 0xab2af7b4, 0xefc34d20, 0x2e096b7c, 0x1741a254, 0xe5b6a035, 0x213d42f6, 0x2c1c7c26,
+		0x61c2f50f, 0x6552daf9, 0xd2c231f8, 0x25130f69, 0xd8167fa2, 0x0418f2c8, 0x001a96a6, 0x0d1526ab,
+		0x63315c21, 0x5e0a72ec, 0x49bafefd, 0x187908d9, 0x8d0dbd86, 0x311170a7, 0x3e9b640c, 0xcc3e10d7,
+		0xd5cad3b6, 0x0caec388, 0xf73001e1, 0x6c728aff, 0x71eae2a1, 0x1f9af36e, 0xcfcbd12f, 0xc1de8417,
+		0xac07be6b, 0xcb44a1d8, 0x8b9b0f56, 0x013988c3, 0xb1c52fca, 0xb4be31cd, 0xd8782806, 0x12a3a4e2,
+		0x6f7de532, 0x58fd7eb6, 0xd01ee900, 0x24adffc2, 0xf4990fc5, 0x9711aac5, 0x001d7b95, 0x82e5e7d2,
+		0x109873f6, 0x00613096, 0xc32d9521, 0xada121ff, 0x29908415, 0x7fbb977f, 0xaf9eb3db, 0x29c9ed2a,
+		0x5ce2a465, 0xa730f32c, 0xd0aa3fe8, 0x8a5cc091, 0xd49e2ce7, 0x0ce454a9, 0xd60acd86, 0x015f1919,
+		0x77079103, 0xdea03af6, 0x78a8565e, 0xdee356df, 0x21f05cbe, 0x8b75e387, 0xb3c50651, 0xb8a5c3ef,
+		0xd8eeb6d2, 0xe523be77, 0xc2154529, 0x2f69efdf, 0xafe67afb, 0xf470c4b2, 0xf3e0eb5b, 0xd6cc9876,
+		0x39e4460c, 0x1fda8538, 0x1987832f, 0xca007367, 0xa99144f8, 0x296b299e, 0x492fc295, 0x9266beab,
+		0xb5676e69, 0x9bd3ddda, 0xdf7e052f, 0xdb25701c, 0x1b5e51ee, 0xf65324e6, 0x6afce36c, 0x0316cc04,
+		0x8644213e, 0xb7dc59d0, 0x7965291f, 0xccd6fd43, 0x41823979, 0x932bcdf6, 0xb657c34d, 0x4edfd282,
+		0x7ae5290c, 0x3cb9536b, 0x851e20fe, 0x9833557e, 0x13ecf0b0, 0xd3ffb372, 0x3f85c5c1, 0x0aef7ed2,
+	},
+	{
+		0x7ec90c04, 0x2c6e74b9, 0x9b0e66df, 0xa6337911, 0xb86a7fff, 0x1dd358f5, 0x44dd9d44, 0x1731167f,
+		0x08fbf1fa, 0xe7f511cc, 0xd2051b00, 0x735aba00, 0x2ab722d8, 0x386381cb, 0xacf6243a, 0x69befd7a,
+		0xe6a2e77f, 0xf0c720cd, 0xc4494816, 0xccf5c180, 0x38851640, 0x15b0a848, 0xe68b18cb, 0x4caadeff,
+		0x5f480a01, 0x0412b2aa, 0x259814fc, 0x41d0efe2, 0x4e40b48d, 0x248eb6fb, 0x8dba1cfe, 0x41a99b02,
+		0x1a550a04, 0xba8f65cb, 0x7251f4e7, 0x95a51725, 0xc106ecd7, 0x97a5980a, 0xc539b9aa, 0x4d79fe6a,
+		0xf2f3f763, 0x68af8040, 0xed0c9e56, 0x11b4958b, 0xe1eb5a88, 0x8709e6b0, 0xd7e07156, 0x4e29fea7,
+		0x6366e52d, 0x02d1c000, 0xc4ac8e05, 0x9377f571, 0x0c05372a, 0x578535f2, 0x2261be02, 0xd642a0c9,
+		0xdf13a280, 0x74b55bd2, 0x682199c0, 0xd421e5ec, 0x53fb3ce8, 0xc8adedb3, 0x28a87fc9, 0x3d959981,
+		0x5c1ff900, 0xfe38d399, 0x0c4eff0b, 0x062407ea, 0xaa2f4fb1, 0x4fb96976, 0x90c79505, 0xb0a8a774,
+		0xef55a1ff, 0xe59ca2c2, 0xa6b62d27, 0xe66a4263, 0xdf65001f, 0x0ec50966, 0xdfdd55bc, 0x29de0655,
+		0x911e739a, 0x17af8975, 0x32c7911c, 0x89f89468, 0x0d01e980, 0x524755f4, 0x03b63cc9, 0x0cc844b2,
+		0xbcf3f0aa, 0x87ac36e9, 0xe53a7426, 0x01b3d82b, 0x1a9e7449, 0x64ee2d7e, 0xcddbb1da, 0x01c94910,
+		0xb868bf80, 0x0d26f3fd, 0x9342ede7, 0x04a5c284, 0x636737b6, 0x50f5b616, 0xf24766e3, 0x8eca36c1,
+		0x136e05db, 0xfef18391, 0xfb887a37, 0xd6e7f7d4, 0xc7fb7dc9, 0x3063fcdf, 0xb6f589de, 0xec2941da,
+		0x26e46695, 0xb7566419, 0xf654efc5, 0xd08d58b7, 0x48925401, 0xc1bacb7f, 0xe5ff550f, 0xb6083049,
+		0x5bb5d0e8, 0x87d72e5a, 0xab6a6ee1, 0x223a66ce, 0xc62bf3cd, 0x9e0885f9, 0x68cb3e47, 0x086c010f,
+		0xa21de820, 0xd18b69de, 0xf3f65777, 0xfa02c3f6, 0x407edac3, 0xcbb3d550, 0x1793084d, 0xb0d70eba,
+		0x0ab378d5, 0xd951fb0c, 0xded7da56, 0x4124bbe4, 0x94ca0b56, 0x0f5755d1, 0xe0e1e56e, 0x6184b5be,
+		0x580a249f, 0x94f74bc0, 0xe327888e, 0x9f7b5561, 0xc3dc0280, 0x05687715, 0x646c6bd7, 0x44904db3,
+		0x66b4f0a3, 0xc0f1648a, 0x697ed5af, 0x49e92ff6, 0x309e374f, 0x2cb6356a, 0x85808573, 0x4991f840,
+		0x76f0ae02, 0x083be84d, 0x28421c9a, 0x44489406, 0x736e4cb8, 0xc1092910, 0x8bc95fc6, 0x7d869cf4,
+		0x134f616f, 0x2e77118d, 0xb31b2be1, 0xaa90b472, 0x3ca5d717, 0x7d161bba, 0x9cad9010, 0xaf462ba2,
+		0x9fe459d2, 0x45d34559, 0xd9f2da13, 0xdbc65487, 0xf3e4f94e, 0x176d486f, 0x097c13ea, 0x631da5c7,
+		0x445f7382, 0x175683f4, 0xcdc66a97, 0x70be0288, 0xb3cdcf72, 0x6e5dd2f3, 0x20936079, 0x459b80a5,
+		0xbe60e2db, 0xa9c23101, 0xeba5315c, 0x224e42f2, 0x1c5c1572, 0xf6721b2c, 0x1ad2fff3, 0x8c25404e,
+		0x324ed72f, 0x4067b7fd, 0x0523138e, 0x5ca3bc78, 0xdc0fd66e, 0x75922283, 0x784d6b17, 0x58ebb16e,
+		0x44094f85, 0x3f481d87, 0xfcfeae7b, 0x77b5ff76, 0x8c2302bf, 0xaaf47556, 0x5f46b02a, 0x2b092801,
+		0x3d38f5f7, 0x0ca81f36, 0x52af4a8a, 0x66d5e7c0, 0xdf3b0874, 0x95055110, 0x1b5ad7a8, 0xf61ed5ad,
+		0x6cf6e479, 0x20758184, 0xd0cefa65, 0x88f7be58, 0x4a046826, 0x0ff6f8f3, 0xa09c7f70, 0x5346aba0,
+		0x5ce96c28, 0xe176eda3, 0x6bac307f, 0x376829d2, 0x85360fa9, 0x17e3fe2a, 0x24b79767, 0xf5a96b20,
+		0xd6cd2595, 0x68ff1ebf, 0x7555442c, 0xf19f06be, 0xf9e0659a, 0xeeb9491d, 0x34010718, 0xbb30cab8,
+		0xe822fe15, 0x88570983, 0x750e6249, 0xda627e55, 0x5e76ffa8, 0xb1534546, 0x6d47de08, 0xefe9e7d4,
+	},
+	{
+		0xf6fa8f9d, 0x2cac6ce1, 0x4ca34867, 0xe2337f7c, 0x95db08e7, 0x016843b4, 0xeced5cbc, 0x325553ac,
+		0xbf9f0960, 0xdfa1e2ed, 0x83f0579d, 0x63ed86b9, 0x1ab6a6b8, 0xde5ebe39, 0xf38ff732, 0x8989b138,
+		0x33f14961, 0xc01937bd, 0xf506c6da, 0xe4625e7e, 0xa308ea99, 0x4e23e33c, 0x79cbd7cc, 0x48a14367,
+		0xa3149619, 0xfec94bd5, 0xa114174a, 0xeaa01866, 0xa084db2d, 0x09a8486f, 0xa888614a, 0x2900af98,
+		0x01665991, 0xe1992863, 0xc8f30c60, 0x2e78ef3c, 0xd0d51932, 0xcf0fec14, 0xf7ca07d2, 0xd0a82072,
+		0xfd41197e, 0x9305a6b0, 0xe86be3da, 0x74bed3cd, 0x372da53c, 0x4c7f4448, 0xdab5d440, 0x6dba0ec3,
+		0x083919a7, 0x9fbaeed9, 0x49dbcfb0, 0x4e670c53, 0x5c3d9c01, 0x64bdb941, 0x2c0e636a, 0xba7dd9cd,
+		0xea6f7388, 0xe70bc762, 0x35f29adb, 0x5c4cdd8d, 0xf0d48d8c, 0xb88153e2, 0x08a19866, 0x1ae2eac8,
+		0x284caf89, 0xaa928223, 0x9334be53, 0x3b3a21bf, 0x16434be3, 0x9aea3906, 0xefe8c36e, 0xf890cdd9,
+		0x80226dae, 0xc340a4a3, 0xdf7e9c09, 0xa694a807, 0x5b7c5ecc, 0x221db3a6, 0x9a69a02f, 0x68818a54,
+		0xceb2296f, 0x53c0843a, 0xfe893655, 0x25bfe68a, 0xb4628abc, 0xcf222ebf, 0x25ac6f48, 0xa9a99387,
+		0x53bddb65, 0xe76ffbe7, 0xe967fd78, 0x0ba93563, 0x8e342bc1, 0xe8a11be9, 0x4980740d, 0xc8087dfc,
+		0x8de4bf99, 0xa11101a0, 0x7fd37975, 0xda5a26c0, 0xe81f994f, 0x9528cd89, 0xfd339fed, 0xb87834bf,
+		0x5f04456d, 0x22258698, 0xc9c4c83b, 0x2dc156be, 0x4f628daa, 0x57f55ec5, 0xe2220abe, 0xd2916ebf,
+		0x4ec75b95, 0x24f2c3c0, 0x42d15d99, 0xcd0d7fa0, 0x7b6e27ff, 0xa8dc8af0, 0x7345c106, 0xf41e232f,
+		0x35162386, 0xe6ea8926, 0x3333b094, 0x157ec6f2, 0x372b74af, 0x692573e4, 0xe9a9d848, 0xf3160289,
+		0x3a62ef1d, 0xa787e238, 0xf3a5f676, 0x74364853, 0x20951063, 0x4576698d, 0xb6fad407, 0x592af950,
+		0x36f73523, 0x4cfb6e87, 0x7da4cec0, 0x6c152daa, 0xcb0396a8, 0xc50dfe5d, 0xfcd707ab, 0x0921c42f,
+		0x89dff0bb, 0x5fe2be78, 0x448f4f33, 0x754613c9, 0x2b05d08d, 0x48b9d585, 0xdc049441, 0xc8098f9b,
+		0x7dede786, 0xc39a3373, 0x42410005, 0x6a091751, 0x0ef3c8a6, 0x890072d6, 0x28207682, 0xa9a9f7be,
+		0xbf32679d, 0xd45b5b75, 0xb353fd00, 0xcbb0e358, 0x830f220a, 0x1f8fb214, 0xd372cf08, 0xcc3c4a13,
+		0x8cf63166, 0x061c87be, 0x88c98f88, 0x6062e397, 0x47cf8e7a, 0xb6c85283, 0x3cc2acfb, 0x3fc06976,
+		0x4e8f0252, 0x64d8314d, 0xda3870e3, 0x1e665459, 0xc10908f0, 0x513021a5, 0x6c5b68b7, 0x822f8aa0,
+		0x3007cd3e, 0x74719eef, 0xdc872681, 0x073340d4, 0x7e432fd9, 0x0c5ec241, 0x8809286c, 0xf592d891,
+		0x08a930f6, 0x957ef305, 0xb7fbffbd, 0xc266e96f, 0x6fe4ac98, 0xb173ecc0, 0xbc60b42a, 0x953498da,
+		0xfba1ae12, 0x2d4bd736, 0x0f25faab, 0xa4f3fceb, 0xe2969123, 0x257f0c3d, 0x9348af49, 0x361400bc,
+		0xe8816f4a, 0x3814f200, 0xa3f94043, 0x9c7a54c2, 0xbc704f57, 0xda41e7f9, 0xc25ad33a, 0x54f4a084,
+		0xb17f5505, 0x59357cbe, 0xedbd15c8, 0x7f97c5ab, 0xba5ac7b5, 0xb6f6deaf, 0x3a479c3a, 0x5302da25,
+		0x653d7e6a, 0x54268d49, 0x51a477ea, 0x5017d55b, 0xd7d25d88, 0x44136c76, 0x0404a8c8, 0xb8e5a121,
+		0xb81a928a, 0x60ed5869, 0x97c55b96, 0xeaec991b, 0x29935913, 0x01fdb7f1, 0x088e8dfa, 0x9ab6f6f5,
+		0x3b4cbf9f, 0x4a5de3ab, 0xe6051d35, 0xa0e1d855, 0xd36b4cf1, 0xf544edeb, 0xb0e93524, 0xbebb8fbd,
+		0xa2d762cf, 0x49c92f54, 0x38b5f331, 0x7128a454, 0x48392905, 0xa65b1db8, 0x851c97bd, 0xd675cf2f,
+	},
+	{
+		0x85e04019, 0x332bf567, 0x662dbfff, 0xcfc65693, 0x2a8d7f6f, 0xab9bc912, 0xde6008a1, 0x2028da1f,
+		0x0227bce7, 0x4d642916, 0x18fac300, 0x50f18b82, 0x2cb2cb11, 0xb232e75c, 0x4b3695f2, 0xb28707de,
+		0xa05fbcf6, 0xcd4181e9, 0xe150210c, 0xe24ef1bd, 0xb168c381, 0xfde4e789, 0x5c79b0d8, 0x1e8bfd43,
+		0x4d495001, 0x38be4341, 0x913cee1d, 0x92a79c3f, 0x089766be, 0xbaeeadf4, 0x1286becf, 0xb6eacb19,
+		0x2660c200, 0x7565bde4, 0x64241f7a, 0x8248dca9, 0xc3b3ad66, 0x28136086, 0x0bd8dfa8, 0x356d1cf2,
+		0x107789be, 0xb3b2e9ce, 0x0502aa8f, 0x0bc0351e, 0x166bf52a, 0xeb12ff82, 0xe3486911, 0xd34d7516,
+		0x4e7b3aff, 0x5f43671b, 0x9cf6e037, 0x4981ac83, 0x334266ce, 0x8c9341b7, 0xd0d854c0, 0xcb3a6c88,
+		0x47bc2829, 0x4725ba37, 0xa66ad22b, 0x7ad61f1e, 0x0c5cbafa, 0x4437f107, 0xb6e79962, 0x42d2d816,
+		0x0a961288, 0xe1a5c06e, 0x13749e67, 0x72fc081a, 0xb1d139f7, 0xf9583745, 0xcf19df58, 0xbec3f756,
+		0xc06eba30, 0x07211b24, 0x45c28829, 0xc95e317f, 0xbc8ec511, 0x38bc46e9, 0xc6e6fa14, 0xbae8584a,
+		0xad4ebc46, 0x468f508b, 0x7829435f, 0xf124183b, 0x821dba9f, 0xaff60ff4, 0xea2c4e6d, 0x16e39264,
+		0x92544a8b, 0x009b4fc3, 0xaba68ced, 0x9ac96f78, 0x06a5b79a, 0xb2856e6e, 0x1aec3ca9, 0xbe838688,
+		0x0e0804e9, 0x55f1be56, 0xe7e5363b, 0xb3a1f25d, 0xf7debb85, 0x61fe033c, 0x16746233, 0x3c034c28,
+		0xda6d0c74, 0x79aac56c, 0x3ce4e1ad, 0x51f0c802, 0x98f8f35a, 0x1626a49f, 0xeed82b29, 0x1d382fe3,
+		0x0c4fb99a, 0xbb325778, 0x3ec6d97b, 0x6e77a6a9, 0xcb658b5c, 0xd45230c7, 0x2bd1408b, 0x60c03eb7,
+		0xb9068d78, 0xa33754f4, 0xf430c87d, 0xc8a71302, 0xb96d8c32, 0xebd4e7be, 0xbe8b9d2d, 0x7979fb06,
+		0xe7225308, 0x8b75cf77, 0x11ef8da4, 0xe083c858, 0x8d6b786f, 0x5a6317a6, 0xfa5cf7a0, 0x5dda0033,
+		0xf28ebfb0, 0xf5b9c310, 0xa0eac280, 0x08b9767a, 0xa3d9d2b0, 0x79d34217, 0x021a718d, 0x9ac6336a,
+		0x2711fd60, 0x438050e3, 0x069908a8, 0x3d7fedc4, 0x826d2bef, 0x4eeb8476, 0x488dcf25, 0x36c9d566,
+		0x28e74e41, 0xc2610aca, 0x3d49a9cf, 0xbae3b9df, 0xb65f8de6, 0x92aeaf64, 0x3ac7d5e6, 0x9ea80509,
+		0xf22b017d, 0xa4173f70, 0xdd1e16c3, 0x15e0d7f9, 0x50b1b887, 0x2b9f4fd5, 0x625aba82, 0x6a017962,
+		0x2ec01b9c, 0x15488aa9, 0xd716e740, 0x40055a2c, 0x93d29a22, 0xe32dbf9a, 0x058745b9, 0x3453dc1e,
+		0xd699296e, 0x496cff6f, 0x1c9f4986, 0xdfe2ed07, 0xb87242d1, 0x19de7eae, 0x053e561a, 0x15ad6f8c,
+		0x66626c1c, 0x7154c24c, 0xea082b2a, 0x93eb2939, 0x17dcb0f0, 0x58d4f2ae, 0x9ea294fb, 0x52cf564c,
+		0x9883fe66, 0x2ec40581, 0x763953c3, 0x01d6692e, 0xd3a0c108, 0xa1e7160e, 0xe4f2dfa6, 0x693ed285,
+		0x74904698, 0x4c2b0edd, 0x4f757656, 0x5d393378, 0xa132234f, 0x3d321c5d, 0xc3f5e194, 0x4b269301,
+		0xc79f022f, 0x3c997e7e, 0x5e4f9504, 0x3ffafbbd, 0x76f7ad0e, 0x296693f4, 0x3d1fce6f, 0xc61e45be,
+		0xd3b5ab34, 0xf72bf9b7, 0x1b0434c0, 0x4e72b567, 0x5592a33d, 0xb5229301, 0xcfd2a87f, 0x60aeb767,
+		0x1814386b, 0x30bcc33d, 0x38a0c07d, 0xfd1606f2, 0xc363519b, 0x589dd390, 0x5479f8e6, 0x1cb8d647,
+		0x97fd61a9, 0xea7759f4, 0x2d57539d, 0x569a58cf, 0xe84e63ad, 0x462e1b78, 0x6580f87e, 0xf3817914,
+		0x91da55f4, 0x40a230f3, 0xd1988f35, 0xb6e318d2, 0x3ffa50bc, 0x3d40f021, 0xc3c0bdae, 0x4958c24c,
+		0x518f36b2, 0x84b1d370, 0x0fedce83, 0x878ddada, 0xf2a279c7, 0x94e01be8, 0x90716f4b, 0x954b8aa3,
+	},
+	{
+		0xe216300d, 0xbbddfffc, 0xa7ebdabd, 0x35648095, 0x7789f8b7, 0xe6c1121b, 0x0e241600, 0x052ce8b5,
+		0x11a9cfb0, 0xe5952f11, 0xece7990a, 0x9386d174, 0x2a42931c, 0x76e38111, 0xb12def3a, 0x37ddddfc,
+		0xde9adeb1, 0x0a0cc32c, 0xbe197029, 0x84a00940, 0xbb243a0f, 0xb4d137cf, 0xb44e79f0, 0x049eedfd,
+		0x0b15a15d, 0x480d3168, 0x8bbbde5a, 0x669ded42, 0xc7ece831, 0x3f8f95e7, 0x72df191b, 0x7580330d,
+		0x94074251, 0x5c7dcdfa, 0xabbe6d63, 0xaa402164, 0xb301d40a, 0x02e7d1ca, 0x53571dae, 0x7a3182a2,
+		0x12a8ddec, 0xfdaa335d, 0x176f43e8, 0x71fb46d4, 0x38129022, 0xce949ad4, 0xb84769ad, 0x965bd862,
+		0x82f3d055, 0x66fb9767, 0x15b80b4e, 0x1d5b47a0, 0x4cfde06f, 0xc28ec4b8, 0x57e8726e, 0x647a78fc,
+		0x99865d44, 0x608bd593, 0x6c200e03, 0x39dc5ff6, 0x5d0b00a3, 0xae63aff2, 0x7e8bd632, 0x70108c0c,
+		0xbbd35049, 0x2998df04, 0x980cf42a, 0x9b6df491, 0x9e7edd53, 0x06918548, 0x58cb7e07, 0x3b74ef2e,
+		0x522fffb1, 0xd24708cc, 0x1c7e27cd, 0xa4eb215b, 0x3cf1d2e2, 0x19b47a38, 0x424f7618, 0x35856039,
+		0x9d17dee7, 0x27eb35e6, 0xc9aff67b, 0x36baf5b8, 0x09c467cd, 0xc18910b1, 0xe11dbf7b, 0x06cd1af8,
+		0x7170c608, 0x2d5e3354, 0xd4de495a, 0x64c6d006, 0xbcc0c62c, 0x3dd00db3, 0x708f8f34, 0x77d51b42,
+		0x264f620f, 0x24b8d2bf, 0x15c1b79e, 0x46a52564, 0xf8d7e54e, 0x3e378160, 0x7895cda5, 0x859c15a5,
+		0xe6459788, 0xc37bc75f, 0xdb07ba0c, 0x0676a3ab, 0x7f229b1e, 0x31842e7b, 0x24259fd7, 0xf8bef472,
+		0x835ffcb8, 0x6df4c1f2, 0x96f5b195, 0xfd0af0fc, 0xb0fe134c, 0xe2506d3d, 0x4f9b12ea, 0xf215f225,
+		0xa223736f, 0x9fb4c428, 0x25d04979, 0x34c713f8, 0xc4618187, 0xea7a6e98, 0x7cd16efc, 0x1436876c,
+		0xf1544107, 0xbedeee14, 0x56e9af27, 0xa04aa441, 0x3cf7c899, 0x92ecbae6, 0xdd67016d, 0x151682eb,
+		0xa842eedf, 0xfdba60b4, 0xf1907b75, 0x20e3030f, 0x24d8c29e, 0xe139673b, 0xefa63fb8, 0x71873054,
+		0xb6f2cf3b, 0x9f326442, 0xcb15a4cc, 0xb01a4504, 0xf1e47d8d, 0x844a1be5, 0xbae7dfdc, 0x42cbda70,
+		0xcd7dae0a, 0x57e85b7a, 0xd53f5af6, 0x20cf4d8c, 0xcea4d428, 0x79d130a4, 0x3486ebfb, 0x33d3cddc,
+		0x77853b53, 0x37effcb5, 0xc5068778, 0xe580b3e6, 0x4e68b8f4, 0xc5c8b37e, 0x0d809ea2, 0x398feb7c,
+		0x132a4f94, 0x43b7950e, 0x2fee7d1c, 0x223613bd, 0xdd06caa2, 0x37df932b, 0xc4248289, 0xacf3ebc3,
+		0x5715f6b7, 0xef3478dd, 0xf267616f, 0xc148cbe4, 0x9052815e, 0x5e410fab, 0xb48a2465, 0x2eda7fa4,
+		0xe87b40e4, 0xe98ea084, 0x5889e9e1, 0xefd390fc, 0xdd07d35b, 0xdb485694, 0x38d7e5b2, 0x57720101,
+		0x730edebc, 0x5b643113, 0x94917e4f, 0x503c2fba, 0x646f1282, 0x7523d24a, 0xe0779695, 0xf9c17a8f,
+		0x7a5b2121, 0xd187b896, 0x29263a4d, 0xba510cdf, 0x81f47c9f, 0xad1163ed, 0xea7b5965, 0x1a00726e,
+		0x11403092, 0x00da6d77, 0x4a0cdd61, 0xad1f4603, 0x605bdfb0, 0x9eedc364, 0x22ebe6a8, 0xcee7d28a,
+		0xa0e736a0, 0x5564a6b9, 0x10853209, 0xc7eb8f37, 0x2de705ca, 0x8951570f, 0xdf09822b, 0xbd691a6c,
+		0xaa12e4f2, 0x87451c0f, 0xe0f6a27a, 0x3ada4819, 0x4cf1764f, 0x0d771c2b, 0x67cdb156, 0x350d8384,
+		0x5938fa0f, 0x42399ef3, 0x36997b07, 0x0e84093d, 0x4aa93e61, 0x8360d87b, 0x1fa98b0c, 0x1149382c,
+		0xe97625a5, 0x0614d1b7, 0x0e25244b, 0x0c768347, 0x589e8d82, 0x0d2059d1, 0xa466bb1e, 0xf8da0a82,
+		0x04f19130, 0xba6e4ec0, 0x99265164, 0x1ee7230d, 0x50b2ad80, 0xeaee6801, 0x8db2a283, 0xea8bf59e,
+	},
+}

vendor/golang.org/x/crypto/openpgp/armor/armor.go

@@ -0,0 +1,219 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package armor implements OpenPGP ASCII Armor, see RFC 4880. OpenPGP Armor is
+// very similar to PEM except that it has an additional CRC checksum.
+package armor // import "golang.org/x/crypto/openpgp/armor"
+
+import (
+	"bufio"
+	"bytes"
+	"encoding/base64"
+	"golang.org/x/crypto/openpgp/errors"
+	"io"
+)
+
+// A Block represents an OpenPGP armored structure.
+//
+// The encoded form is:
+//    -----BEGIN Type-----
+//    Headers
+//
+//    base64-encoded Bytes
+//    '=' base64 encoded checksum
+//    -----END Type-----
+// where Headers is a possibly empty sequence of Key: Value lines.
+//
+// Since the armored data can be very large, this package presents a streaming
+// interface.
+type Block struct {
+	Type    string            // The type, taken from the preamble (i.e. "PGP SIGNATURE").
+	Header  map[string]string // Optional headers.
+	Body    io.Reader         // A Reader from which the contents can be read
+	lReader lineReader
+	oReader openpgpReader
+}
+
+var ArmorCorrupt error = errors.StructuralError("armor invalid")
+
+const crc24Init = 0xb704ce
+const crc24Poly = 0x1864cfb
+const crc24Mask = 0xffffff
+
+// crc24 calculates the OpenPGP checksum as specified in RFC 4880, section 6.1
+func crc24(crc uint32, d []byte) uint32 {
+	for _, b := range d {
+		crc ^= uint32(b) << 16
+		for i := 0; i < 8; i++ {
+			crc <<= 1
+			if crc&0x1000000 != 0 {
+				crc ^= crc24Poly
+			}
+		}
+	}
+	return crc
+}
+
+var armorStart = []byte("-----BEGIN ")
+var armorEnd = []byte("-----END ")
+var armorEndOfLine = []byte("-----")
+
+// lineReader wraps a line based reader. It watches for the end of an armor
+// block and records the expected CRC value.
+type lineReader struct {
+	in  *bufio.Reader
+	buf []byte
+	eof bool
+	crc uint32
+}
+
+func (l *lineReader) Read(p []byte) (n int, err error) {
+	if l.eof {
+		return 0, io.EOF
+	}
+
+	if len(l.buf) > 0 {
+		n = copy(p, l.buf)
+		l.buf = l.buf[n:]
+		return
+	}
+
+	line, isPrefix, err := l.in.ReadLine()
+	if err != nil {
+		return
+	}
+	if isPrefix {
+		return 0, ArmorCorrupt
+	}
+
+	if len(line) == 5 && line[0] == '=' {
+		// This is the checksum line
+		var expectedBytes [3]byte
+		var m int
+		m, err = base64.StdEncoding.Decode(expectedBytes[0:], line[1:])
+		if m != 3 || err != nil {
+			return
+		}
+		l.crc = uint32(expectedBytes[0])<<16 |
+			uint32(expectedBytes[1])<<8 |
+			uint32(expectedBytes[2])
+
+		line, _, err = l.in.ReadLine()
+		if err != nil && err != io.EOF {
+			return
+		}
+		if !bytes.HasPrefix(line, armorEnd) {
+			return 0, ArmorCorrupt
+		}
+
+		l.eof = true
+		return 0, io.EOF
+	}
+
+	if len(line) > 96 {
+		return 0, ArmorCorrupt
+	}
+
+	n = copy(p, line)
+	bytesToSave := len(line) - n
+	if bytesToSave > 0 {
+		if cap(l.buf) < bytesToSave {
+			l.buf = make([]byte, 0, bytesToSave)
+		}
+		l.buf = l.buf[0:bytesToSave]
+		copy(l.buf, line[n:])
+	}
+
+	return
+}
+
+// openpgpReader passes Read calls to the underlying base64 decoder, but keeps
+// a running CRC of the resulting data and checks the CRC against the value
+// found by the lineReader at EOF.
+type openpgpReader struct {
+	lReader    *lineReader
+	b64Reader  io.Reader
+	currentCRC uint32
+}
+
+func (r *openpgpReader) Read(p []byte) (n int, err error) {
+	n, err = r.b64Reader.Read(p)
+	r.currentCRC = crc24(r.currentCRC, p[:n])
+
+	if err == io.EOF {
+		if r.lReader.crc != uint32(r.currentCRC&crc24Mask) {
+			return 0, ArmorCorrupt
+		}
+	}
+
+	return
+}
+
+// Decode reads a PGP armored block from the given Reader. It will ignore
+// leading garbage. If it doesn't find a block, it will return nil, io.EOF. The
+// given Reader is not usable after calling this function: an arbitrary amount
+// of data may have been read past the end of the block.
+func Decode(in io.Reader) (p *Block, err error) {
+	r := bufio.NewReaderSize(in, 100)
+	var line []byte
+	ignoreNext := false
+
+TryNextBlock:
+	p = nil
+
+	// Skip leading garbage
+	for {
+		ignoreThis := ignoreNext
+		line, ignoreNext, err = r.ReadLine()
+		if err != nil {
+			return
+		}
+		if ignoreNext || ignoreThis {
+			continue
+		}
+		line = bytes.TrimSpace(line)
+		if len(line) > len(armorStart)+len(armorEndOfLine) && bytes.HasPrefix(line, armorStart) {
+			break
+		}
+	}
+
+	p = new(Block)
+	p.Type = string(line[len(armorStart) : len(line)-len(armorEndOfLine)])
+	p.Header = make(map[string]string)
+	nextIsContinuation := false
+	var lastKey string
+
+	// Read headers
+	for {
+		isContinuation := nextIsContinuation
+		line, nextIsContinuation, err = r.ReadLine()
+		if err != nil {
+			p = nil
+			return
+		}
+		if isContinuation {
+			p.Header[lastKey] += string(line)
+			continue
+		}
+		line = bytes.TrimSpace(line)
+		if len(line) == 0 {
+			break
+		}
+
+		i := bytes.Index(line, []byte(": "))
+		if i == -1 {
+			goto TryNextBlock
+		}
+		lastKey = string(line[:i])
+		p.Header[lastKey] = string(line[i+2:])
+	}
+
+	p.lReader.in = r
+	p.oReader.currentCRC = crc24Init
+	p.oReader.lReader = &p.lReader
+	p.oReader.b64Reader = base64.NewDecoder(base64.StdEncoding, &p.lReader)
+	p.Body = &p.oReader
+
+	return
+}

vendor/golang.org/x/crypto/openpgp/armor/encode.go

@@ -0,0 +1,160 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package armor
+
+import (
+	"encoding/base64"
+	"io"
+)
+
+var armorHeaderSep = []byte(": ")
+var blockEnd = []byte("\n=")
+var newline = []byte("\n")
+var armorEndOfLineOut = []byte("-----\n")
+
+// writeSlices writes its arguments to the given Writer.
+func writeSlices(out io.Writer, slices ...[]byte) (err error) {
+	for _, s := range slices {
+		_, err = out.Write(s)
+		if err != nil {
+			return err
+		}
+	}
+	return
+}
+
+// lineBreaker breaks data across several lines, all of the same byte length
+// (except possibly the last). Lines are broken with a single '\n'.
+type lineBreaker struct {
+	lineLength  int
+	line        []byte
+	used        int
+	out         io.Writer
+	haveWritten bool
+}
+
+func newLineBreaker(out io.Writer, lineLength int) *lineBreaker {
+	return &lineBreaker{
+		lineLength: lineLength,
+		line:       make([]byte, lineLength),
+		used:       0,
+		out:        out,
+	}
+}
+
+func (l *lineBreaker) Write(b []byte) (n int, err error) {
+	n = len(b)
+
+	if n == 0 {
+		return
+	}
+
+	if l.used == 0 && l.haveWritten {
+		_, err = l.out.Write([]byte{'\n'})
+		if err != nil {
+			return
+		}
+	}
+
+	if l.used+len(b) < l.lineLength {
+		l.used += copy(l.line[l.used:], b)
+		return
+	}
+
+	l.haveWritten = true
+	_, err = l.out.Write(l.line[0:l.used])
+	if err != nil {
+		return
+	}
+	excess := l.lineLength - l.used
+	l.used = 0
+
+	_, err = l.out.Write(b[0:excess])
+	if err != nil {
+		return
+	}
+
+	_, err = l.Write(b[excess:])
+	return
+}
+
+func (l *lineBreaker) Close() (err error) {
+	if l.used > 0 {
+		_, err = l.out.Write(l.line[0:l.used])
+		if err != nil {
+			return
+		}
+	}
+
+	return
+}
+
+// encoding keeps track of a running CRC24 over the data which has been written
+// to it and outputs a OpenPGP checksum when closed, followed by an armor
+// trailer.
+//
+// It's built into a stack of io.Writers:
+//    encoding -> base64 encoder -> lineBreaker -> out
+type encoding struct {
+	out       io.Writer
+	breaker   *lineBreaker
+	b64       io.WriteCloser
+	crc       uint32
+	blockType []byte
+}
+
+func (e *encoding) Write(data []byte) (n int, err error) {
+	e.crc = crc24(e.crc, data)
+	return e.b64.Write(data)
+}
+
+func (e *encoding) Close() (err error) {
+	err = e.b64.Close()
+	if err != nil {
+		return
+	}
+	e.breaker.Close()
+
+	var checksumBytes [3]byte
+	checksumBytes[0] = byte(e.crc >> 16)
+	checksumBytes[1] = byte(e.crc >> 8)
+	checksumBytes[2] = byte(e.crc)
+
+	var b64ChecksumBytes [4]byte
+	base64.StdEncoding.Encode(b64ChecksumBytes[:], checksumBytes[:])
+
+	return writeSlices(e.out, blockEnd, b64ChecksumBytes[:], newline, armorEnd, e.blockType, armorEndOfLine)
+}
+
+// Encode returns a WriteCloser which will encode the data written to it in
+// OpenPGP armor.
+func Encode(out io.Writer, blockType string, headers map[string]string) (w io.WriteCloser, err error) {
+	bType := []byte(blockType)
+	err = writeSlices(out, armorStart, bType, armorEndOfLineOut)
+	if err != nil {
+		return
+	}
+
+	for k, v := range headers {
+		err = writeSlices(out, []byte(k), armorHeaderSep, []byte(v), newline)
+		if err != nil {
+			return
+		}
+	}
+
+	_, err = out.Write(newline)
+	if err != nil {
+		return
+	}
+
+	e := &encoding{
+		out:       out,
+		breaker:   newLineBreaker(out, 64),
+		crc:       crc24Init,
+		blockType: bType,
+	}
+	e.b64 = base64.NewEncoder(base64.StdEncoding, e.breaker)
+	return e, nil
+}

vendor/golang.org/x/crypto/openpgp/canonical_text.go

@@ -0,0 +1,59 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package openpgp
+
+import "hash"
+
+// NewCanonicalTextHash reformats text written to it into the canonical
+// form and then applies the hash h.  See RFC 4880, section 5.2.1.
+func NewCanonicalTextHash(h hash.Hash) hash.Hash {
+	return &canonicalTextHash{h, 0}
+}
+
+type canonicalTextHash struct {
+	h hash.Hash
+	s int
+}
+
+var newline = []byte{'\r', '\n'}
+
+func (cth *canonicalTextHash) Write(buf []byte) (int, error) {
+	start := 0
+
+	for i, c := range buf {
+		switch cth.s {
+		case 0:
+			if c == '\r' {
+				cth.s = 1
+			} else if c == '\n' {
+				cth.h.Write(buf[start:i])
+				cth.h.Write(newline)
+				start = i + 1
+			}
+		case 1:
+			cth.s = 0
+		}
+	}
+
+	cth.h.Write(buf[start:])
+	return len(buf), nil
+}
+
+func (cth *canonicalTextHash) Sum(in []byte) []byte {
+	return cth.h.Sum(in)
+}
+
+func (cth *canonicalTextHash) Reset() {
+	cth.h.Reset()
+	cth.s = 0
+}
+
+func (cth *canonicalTextHash) Size() int {
+	return cth.h.Size()
+}
+
+func (cth *canonicalTextHash) BlockSize() int {
+	return cth.h.BlockSize()
+}

vendor/golang.org/x/crypto/openpgp/elgamal/elgamal.go

@@ -0,0 +1,122 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package elgamal implements ElGamal encryption, suitable for OpenPGP,
+// as specified in "A Public-Key Cryptosystem and a Signature Scheme Based on
+// Discrete Logarithms," IEEE Transactions on Information Theory, v. IT-31,
+// n. 4, 1985, pp. 469-472.
+//
+// This form of ElGamal embeds PKCS#1 v1.5 padding, which may make it
+// unsuitable for other protocols. RSA should be used in preference in any
+// case.
+package elgamal // import "golang.org/x/crypto/openpgp/elgamal"
+
+import (
+	"crypto/rand"
+	"crypto/subtle"
+	"errors"
+	"io"
+	"math/big"
+)
+
+// PublicKey represents an ElGamal public key.
+type PublicKey struct {
+	G, P, Y *big.Int
+}
+
+// PrivateKey represents an ElGamal private key.
+type PrivateKey struct {
+	PublicKey
+	X *big.Int
+}
+
+// Encrypt encrypts the given message to the given public key. The result is a
+// pair of integers. Errors can result from reading random, or because msg is
+// too large to be encrypted to the public key.
+func Encrypt(random io.Reader, pub *PublicKey, msg []byte) (c1, c2 *big.Int, err error) {
+	pLen := (pub.P.BitLen() + 7) / 8
+	if len(msg) > pLen-11 {
+		err = errors.New("elgamal: message too long")
+		return
+	}
+
+	// EM = 0x02 || PS || 0x00 || M
+	em := make([]byte, pLen-1)
+	em[0] = 2
+	ps, mm := em[1:len(em)-len(msg)-1], em[len(em)-len(msg):]
+	err = nonZeroRandomBytes(ps, random)
+	if err != nil {
+		return
+	}
+	em[len(em)-len(msg)-1] = 0
+	copy(mm, msg)
+
+	m := new(big.Int).SetBytes(em)
+
+	k, err := rand.Int(random, pub.P)
+	if err != nil {
+		return
+	}
+
+	c1 = new(big.Int).Exp(pub.G, k, pub.P)
+	s := new(big.Int).Exp(pub.Y, k, pub.P)
+	c2 = s.Mul(s, m)
+	c2.Mod(c2, pub.P)
+
+	return
+}
+
+// Decrypt takes two integers, resulting from an ElGamal encryption, and
+// returns the plaintext of the message. An error can result only if the
+// ciphertext is invalid. Users should keep in mind that this is a padding
+// oracle and thus, if exposed to an adaptive chosen ciphertext attack, can
+// be used to break the cryptosystem.  See ``Chosen Ciphertext Attacks
+// Against Protocols Based on the RSA Encryption Standard PKCS #1'', Daniel
+// Bleichenbacher, Advances in Cryptology (Crypto '98),
+func Decrypt(priv *PrivateKey, c1, c2 *big.Int) (msg []byte, err error) {
+	s := new(big.Int).Exp(c1, priv.X, priv.P)
+	s.ModInverse(s, priv.P)
+	s.Mul(s, c2)
+	s.Mod(s, priv.P)
+	em := s.Bytes()
+
+	firstByteIsTwo := subtle.ConstantTimeByteEq(em[0], 2)
+
+	// The remainder of the plaintext must be a string of non-zero random
+	// octets, followed by a 0, followed by the message.
+	//   lookingForIndex: 1 iff we are still looking for the zero.
+	//   index: the offset of the first zero byte.
+	var lookingForIndex, index int
+	lookingForIndex = 1
+
+	for i := 1; i < len(em); i++ {
+		equals0 := subtle.ConstantTimeByteEq(em[i], 0)
+		index = subtle.ConstantTimeSelect(lookingForIndex&equals0, i, index)
+		lookingForIndex = subtle.ConstantTimeSelect(equals0, 0, lookingForIndex)
+	}
+
+	if firstByteIsTwo != 1 || lookingForIndex != 0 || index < 9 {
+		return nil, errors.New("elgamal: decryption error")
+	}
+	return em[index+1:], nil
+}
+
+// nonZeroRandomBytes fills the given slice with non-zero random octets.
+func nonZeroRandomBytes(s []byte, rand io.Reader) (err error) {
+	_, err = io.ReadFull(rand, s)
+	if err != nil {
+		return
+	}
+
+	for i := 0; i < len(s); i++ {
+		for s[i] == 0 {
+			_, err = io.ReadFull(rand, s[i:i+1])
+			if err != nil {
+				return
+			}
+		}
+	}
+
+	return
+}

vendor/golang.org/x/crypto/openpgp/errors/errors.go

@@ -0,0 +1,72 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package errors contains common error types for the OpenPGP packages.
+package errors // import "golang.org/x/crypto/openpgp/errors"
+
+import (
+	"strconv"
+)
+
+// A StructuralError is returned when OpenPGP data is found to be syntactically
+// invalid.
+type StructuralError string
+
+func (s StructuralError) Error() string {
+	return "openpgp: invalid data: " + string(s)
+}
+
+// UnsupportedError indicates that, although the OpenPGP data is valid, it
+// makes use of currently unimplemented features.
+type UnsupportedError string
+
+func (s UnsupportedError) Error() string {
+	return "openpgp: unsupported feature: " + string(s)
+}
+
+// InvalidArgumentError indicates that the caller is in error and passed an
+// incorrect value.
+type InvalidArgumentError string
+
+func (i InvalidArgumentError) Error() string {
+	return "openpgp: invalid argument: " + string(i)
+}
+
+// SignatureError indicates that a syntactically valid signature failed to
+// validate.
+type SignatureError string
+
+func (b SignatureError) Error() string {
+	return "openpgp: invalid signature: " + string(b)
+}
+
+type keyIncorrectError int
+
+func (ki keyIncorrectError) Error() string {
+	return "openpgp: incorrect key"
+}
+
+var ErrKeyIncorrect error = keyIncorrectError(0)
+
+type unknownIssuerError int
+
+func (unknownIssuerError) Error() string {
+	return "openpgp: signature made by unknown entity"
+}
+
+var ErrUnknownIssuer error = unknownIssuerError(0)
+
+type keyRevokedError int
+
+func (keyRevokedError) Error() string {
+	return "openpgp: signature made by revoked key"
+}
+
+var ErrKeyRevoked error = keyRevokedError(0)
+
+type UnknownPacketTypeError uint8
+
+func (upte UnknownPacketTypeError) Error() string {
+	return "openpgp: unknown packet type: " + strconv.Itoa(int(upte))
+}

vendor/golang.org/x/crypto/openpgp/keys.go

@@ -0,0 +1,637 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package openpgp
+
+import (
+	"crypto/rsa"
+	"io"
+	"time"
+
+	"golang.org/x/crypto/openpgp/armor"
+	"golang.org/x/crypto/openpgp/errors"
+	"golang.org/x/crypto/openpgp/packet"
+)
+
+// PublicKeyType is the armor type for a PGP public key.
+var PublicKeyType = "PGP PUBLIC KEY BLOCK"
+
+// PrivateKeyType is the armor type for a PGP private key.
+var PrivateKeyType = "PGP PRIVATE KEY BLOCK"
+
+// An Entity represents the components of an OpenPGP key: a primary public key
+// (which must be a signing key), one or more identities claimed by that key,
+// and zero or more subkeys, which may be encryption keys.
+type Entity struct {
+	PrimaryKey  *packet.PublicKey
+	PrivateKey  *packet.PrivateKey
+	Identities  map[string]*Identity // indexed by Identity.Name
+	Revocations []*packet.Signature
+	Subkeys     []Subkey
+}
+
+// An Identity represents an identity claimed by an Entity and zero or more
+// assertions by other entities about that claim.
+type Identity struct {
+	Name          string // by convention, has the form "Full Name (comment) <email@example.com>"
+	UserId        *packet.UserId
+	SelfSignature *packet.Signature
+	Signatures    []*packet.Signature
+}
+
+// A Subkey is an additional public key in an Entity. Subkeys can be used for
+// encryption.
+type Subkey struct {
+	PublicKey  *packet.PublicKey
+	PrivateKey *packet.PrivateKey
+	Sig        *packet.Signature
+}
+
+// A Key identifies a specific public key in an Entity. This is either the
+// Entity's primary key or a subkey.
+type Key struct {
+	Entity        *Entity
+	PublicKey     *packet.PublicKey
+	PrivateKey    *packet.PrivateKey
+	SelfSignature *packet.Signature
+}
+
+// A KeyRing provides access to public and private keys.
+type KeyRing interface {
+	// KeysById returns the set of keys that have the given key id.
+	KeysById(id uint64) []Key
+	// KeysByIdAndUsage returns the set of keys with the given id
+	// that also meet the key usage given by requiredUsage.
+	// The requiredUsage is expressed as the bitwise-OR of
+	// packet.KeyFlag* values.
+	KeysByIdUsage(id uint64, requiredUsage byte) []Key
+	// DecryptionKeys returns all private keys that are valid for
+	// decryption.
+	DecryptionKeys() []Key
+}
+
+// primaryIdentity returns the Identity marked as primary or the first identity
+// if none are so marked.
+func (e *Entity) primaryIdentity() *Identity {
+	var firstIdentity *Identity
+	for _, ident := range e.Identities {
+		if firstIdentity == nil {
+			firstIdentity = ident
+		}
+		if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
+			return ident
+		}
+	}
+	return firstIdentity
+}
+
+// encryptionKey returns the best candidate Key for encrypting a message to the
+// given Entity.
+func (e *Entity) encryptionKey(now time.Time) (Key, bool) {
+	candidateSubkey := -1
+
+	// Iterate the keys to find the newest key
+	var maxTime time.Time
+	for i, subkey := range e.Subkeys {
+		if subkey.Sig.FlagsValid &&
+			subkey.Sig.FlagEncryptCommunications &&
+			subkey.PublicKey.PubKeyAlgo.CanEncrypt() &&
+			!subkey.Sig.KeyExpired(now) &&
+			(maxTime.IsZero() || subkey.Sig.CreationTime.After(maxTime)) {
+			candidateSubkey = i
+			maxTime = subkey.Sig.CreationTime
+		}
+	}
+
+	if candidateSubkey != -1 {
+		subkey := e.Subkeys[candidateSubkey]
+		return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
+	}
+
+	// If we don't have any candidate subkeys for encryption and
+	// the primary key doesn't have any usage metadata then we
+	// assume that the primary key is ok. Or, if the primary key is
+	// marked as ok to encrypt to, then we can obviously use it.
+	i := e.primaryIdentity()
+	if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagEncryptCommunications &&
+		e.PrimaryKey.PubKeyAlgo.CanEncrypt() &&
+		!i.SelfSignature.KeyExpired(now) {
+		return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
+	}
+
+	// This Entity appears to be signing only.
+	return Key{}, false
+}
+
+// signingKey return the best candidate Key for signing a message with this
+// Entity.
+func (e *Entity) signingKey(now time.Time) (Key, bool) {
+	candidateSubkey := -1
+
+	for i, subkey := range e.Subkeys {
+		if subkey.Sig.FlagsValid &&
+			subkey.Sig.FlagSign &&
+			subkey.PublicKey.PubKeyAlgo.CanSign() &&
+			!subkey.Sig.KeyExpired(now) {
+			candidateSubkey = i
+			break
+		}
+	}
+
+	if candidateSubkey != -1 {
+		subkey := e.Subkeys[candidateSubkey]
+		return Key{e, subkey.PublicKey, subkey.PrivateKey, subkey.Sig}, true
+	}
+
+	// If we have no candidate subkey then we assume that it's ok to sign
+	// with the primary key.
+	i := e.primaryIdentity()
+	if !i.SelfSignature.FlagsValid || i.SelfSignature.FlagSign &&
+		!i.SelfSignature.KeyExpired(now) {
+		return Key{e, e.PrimaryKey, e.PrivateKey, i.SelfSignature}, true
+	}
+
+	return Key{}, false
+}
+
+// An EntityList contains one or more Entities.
+type EntityList []*Entity
+
+// KeysById returns the set of keys that have the given key id.
+func (el EntityList) KeysById(id uint64) (keys []Key) {
+	for _, e := range el {
+		if e.PrimaryKey.KeyId == id {
+			var selfSig *packet.Signature
+			for _, ident := range e.Identities {
+				if selfSig == nil {
+					selfSig = ident.SelfSignature
+				} else if ident.SelfSignature.IsPrimaryId != nil && *ident.SelfSignature.IsPrimaryId {
+					selfSig = ident.SelfSignature
+					break
+				}
+			}
+			keys = append(keys, Key{e, e.PrimaryKey, e.PrivateKey, selfSig})
+		}
+
+		for _, subKey := range e.Subkeys {
+			if subKey.PublicKey.KeyId == id {
+				keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
+			}
+		}
+	}
+	return
+}
+
+// KeysByIdAndUsage returns the set of keys with the given id that also meet
+// the key usage given by requiredUsage.  The requiredUsage is expressed as
+// the bitwise-OR of packet.KeyFlag* values.
+func (el EntityList) KeysByIdUsage(id uint64, requiredUsage byte) (keys []Key) {
+	for _, key := range el.KeysById(id) {
+		if len(key.Entity.Revocations) > 0 {
+			continue
+		}
+
+		if key.SelfSignature.RevocationReason != nil {
+			continue
+		}
+
+		if key.SelfSignature.FlagsValid && requiredUsage != 0 {
+			var usage byte
+			if key.SelfSignature.FlagCertify {
+				usage |= packet.KeyFlagCertify
+			}
+			if key.SelfSignature.FlagSign {
+				usage |= packet.KeyFlagSign
+			}
+			if key.SelfSignature.FlagEncryptCommunications {
+				usage |= packet.KeyFlagEncryptCommunications
+			}
+			if key.SelfSignature.FlagEncryptStorage {
+				usage |= packet.KeyFlagEncryptStorage
+			}
+			if usage&requiredUsage != requiredUsage {
+				continue
+			}
+		}
+
+		keys = append(keys, key)
+	}
+	return
+}
+
+// DecryptionKeys returns all private keys that are valid for decryption.
+func (el EntityList) DecryptionKeys() (keys []Key) {
+	for _, e := range el {
+		for _, subKey := range e.Subkeys {
+			if subKey.PrivateKey != nil && (!subKey.Sig.FlagsValid || subKey.Sig.FlagEncryptStorage || subKey.Sig.FlagEncryptCommunications) {
+				keys = append(keys, Key{e, subKey.PublicKey, subKey.PrivateKey, subKey.Sig})
+			}
+		}
+	}
+	return
+}
+
+// ReadArmoredKeyRing reads one or more public/private keys from an armor keyring file.
+func ReadArmoredKeyRing(r io.Reader) (EntityList, error) {
+	block, err := armor.Decode(r)
+	if err == io.EOF {
+		return nil, errors.InvalidArgumentError("no armored data found")
+	}
+	if err != nil {
+		return nil, err
+	}
+	if block.Type != PublicKeyType && block.Type != PrivateKeyType {
+		return nil, errors.InvalidArgumentError("expected public or private key block, got: " + block.Type)
+	}
+
+	return ReadKeyRing(block.Body)
+}
+
+// ReadKeyRing reads one or more public/private keys. Unsupported keys are
+// ignored as long as at least a single valid key is found.
+func ReadKeyRing(r io.Reader) (el EntityList, err error) {
+	packets := packet.NewReader(r)
+	var lastUnsupportedError error
+
+	for {
+		var e *Entity
+		e, err = ReadEntity(packets)
+		if err != nil {
+			// TODO: warn about skipped unsupported/unreadable keys
+			if _, ok := err.(errors.UnsupportedError); ok {
+				lastUnsupportedError = err
+				err = readToNextPublicKey(packets)
+			} else if _, ok := err.(errors.StructuralError); ok {
+				// Skip unreadable, badly-formatted keys
+				lastUnsupportedError = err
+				err = readToNextPublicKey(packets)
+			}
+			if err == io.EOF {
+				err = nil
+				break
+			}
+			if err != nil {
+				el = nil
+				break
+			}
+		} else {
+			el = append(el, e)
+		}
+	}
+
+	if len(el) == 0 && err == nil {
+		err = lastUnsupportedError
+	}
+	return
+}
+
+// readToNextPublicKey reads packets until the start of the entity and leaves
+// the first packet of the new entity in the Reader.
+func readToNextPublicKey(packets *packet.Reader) (err error) {
+	var p packet.Packet
+	for {
+		p, err = packets.Next()
+		if err == io.EOF {
+			return
+		} else if err != nil {
+			if _, ok := err.(errors.UnsupportedError); ok {
+				err = nil
+				continue
+			}
+			return
+		}
+
+		if pk, ok := p.(*packet.PublicKey); ok && !pk.IsSubkey {
+			packets.Unread(p)
+			return
+		}
+	}
+}
+
+// ReadEntity reads an entity (public key, identities, subkeys etc) from the
+// given Reader.
+func ReadEntity(packets *packet.Reader) (*Entity, error) {
+	e := new(Entity)
+	e.Identities = make(map[string]*Identity)
+
+	p, err := packets.Next()
+	if err != nil {
+		return nil, err
+	}
+
+	var ok bool
+	if e.PrimaryKey, ok = p.(*packet.PublicKey); !ok {
+		if e.PrivateKey, ok = p.(*packet.PrivateKey); !ok {
+			packets.Unread(p)
+			return nil, errors.StructuralError("first packet was not a public/private key")
+		} else {
+			e.PrimaryKey = &e.PrivateKey.PublicKey
+		}
+	}
+
+	if !e.PrimaryKey.PubKeyAlgo.CanSign() {
+		return nil, errors.StructuralError("primary key cannot be used for signatures")
+	}
+
+	var current *Identity
+	var revocations []*packet.Signature
+EachPacket:
+	for {
+		p, err := packets.Next()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return nil, err
+		}
+
+		switch pkt := p.(type) {
+		case *packet.UserId:
+			current = new(Identity)
+			current.Name = pkt.Id
+			current.UserId = pkt
+			e.Identities[pkt.Id] = current
+
+			for {
+				p, err = packets.Next()
+				if err == io.EOF {
+					return nil, io.ErrUnexpectedEOF
+				} else if err != nil {
+					return nil, err
+				}
+
+				sig, ok := p.(*packet.Signature)
+				if !ok {
+					return nil, errors.StructuralError("user ID packet not followed by self-signature")
+				}
+
+				if (sig.SigType == packet.SigTypePositiveCert || sig.SigType == packet.SigTypeGenericCert) && sig.IssuerKeyId != nil && *sig.IssuerKeyId == e.PrimaryKey.KeyId {
+					if err = e.PrimaryKey.VerifyUserIdSignature(pkt.Id, e.PrimaryKey, sig); err != nil {
+						return nil, errors.StructuralError("user ID self-signature invalid: " + err.Error())
+					}
+					current.SelfSignature = sig
+					break
+				}
+				current.Signatures = append(current.Signatures, sig)
+			}
+		case *packet.Signature:
+			if pkt.SigType == packet.SigTypeKeyRevocation {
+				revocations = append(revocations, pkt)
+			} else if pkt.SigType == packet.SigTypeDirectSignature {
+				// TODO: RFC4880 5.2.1 permits signatures
+				// directly on keys (eg. to bind additional
+				// revocation keys).
+			} else if current == nil {
+				return nil, errors.StructuralError("signature packet found before user id packet")
+			} else {
+				current.Signatures = append(current.Signatures, pkt)
+			}
+		case *packet.PrivateKey:
+			if pkt.IsSubkey == false {
+				packets.Unread(p)
+				break EachPacket
+			}
+			err = addSubkey(e, packets, &pkt.PublicKey, pkt)
+			if err != nil {
+				return nil, err
+			}
+		case *packet.PublicKey:
+			if pkt.IsSubkey == false {
+				packets.Unread(p)
+				break EachPacket
+			}
+			err = addSubkey(e, packets, pkt, nil)
+			if err != nil {
+				return nil, err
+			}
+		default:
+			// we ignore unknown packets
+		}
+	}
+
+	if len(e.Identities) == 0 {
+		return nil, errors.StructuralError("entity without any identities")
+	}
+
+	for _, revocation := range revocations {
+		err = e.PrimaryKey.VerifyRevocationSignature(revocation)
+		if err == nil {
+			e.Revocations = append(e.Revocations, revocation)
+		} else {
+			// TODO: RFC 4880 5.2.3.15 defines revocation keys.
+			return nil, errors.StructuralError("revocation signature signed by alternate key")
+		}
+	}
+
+	return e, nil
+}
+
+func addSubkey(e *Entity, packets *packet.Reader, pub *packet.PublicKey, priv *packet.PrivateKey) error {
+	var subKey Subkey
+	subKey.PublicKey = pub
+	subKey.PrivateKey = priv
+	p, err := packets.Next()
+	if err == io.EOF {
+		return io.ErrUnexpectedEOF
+	}
+	if err != nil {
+		return errors.StructuralError("subkey signature invalid: " + err.Error())
+	}
+	var ok bool
+	subKey.Sig, ok = p.(*packet.Signature)
+	if !ok {
+		return errors.StructuralError("subkey packet not followed by signature")
+	}
+	if subKey.Sig.SigType != packet.SigTypeSubkeyBinding && subKey.Sig.SigType != packet.SigTypeSubkeyRevocation {
+		return errors.StructuralError("subkey signature with wrong type")
+	}
+	err = e.PrimaryKey.VerifyKeySignature(subKey.PublicKey, subKey.Sig)
+	if err != nil {
+		return errors.StructuralError("subkey signature invalid: " + err.Error())
+	}
+	e.Subkeys = append(e.Subkeys, subKey)
+	return nil
+}
+
+const defaultRSAKeyBits = 2048
+
+// NewEntity returns an Entity that contains a fresh RSA/RSA keypair with a
+// single identity composed of the given full name, comment and email, any of
+// which may be empty but must not contain any of "()<>\x00".
+// If config is nil, sensible defaults will be used.
+func NewEntity(name, comment, email string, config *packet.Config) (*Entity, error) {
+	currentTime := config.Now()
+
+	bits := defaultRSAKeyBits
+	if config != nil && config.RSABits != 0 {
+		bits = config.RSABits
+	}
+
+	uid := packet.NewUserId(name, comment, email)
+	if uid == nil {
+		return nil, errors.InvalidArgumentError("user id field contained invalid characters")
+	}
+	signingPriv, err := rsa.GenerateKey(config.Random(), bits)
+	if err != nil {
+		return nil, err
+	}
+	encryptingPriv, err := rsa.GenerateKey(config.Random(), bits)
+	if err != nil {
+		return nil, err
+	}
+
+	e := &Entity{
+		PrimaryKey: packet.NewRSAPublicKey(currentTime, &signingPriv.PublicKey),
+		PrivateKey: packet.NewRSAPrivateKey(currentTime, signingPriv),
+		Identities: make(map[string]*Identity),
+	}
+	isPrimaryId := true
+	e.Identities[uid.Id] = &Identity{
+		Name:   uid.Name,
+		UserId: uid,
+		SelfSignature: &packet.Signature{
+			CreationTime: currentTime,
+			SigType:      packet.SigTypePositiveCert,
+			PubKeyAlgo:   packet.PubKeyAlgoRSA,
+			Hash:         config.Hash(),
+			IsPrimaryId:  &isPrimaryId,
+			FlagsValid:   true,
+			FlagSign:     true,
+			FlagCertify:  true,
+			IssuerKeyId:  &e.PrimaryKey.KeyId,
+		},
+	}
+
+	// If the user passes in a DefaultHash via packet.Config,
+	// set the PreferredHash for the SelfSignature.
+	if config != nil && config.DefaultHash != 0 {
+		e.Identities[uid.Id].SelfSignature.PreferredHash = []uint8{hashToHashId(config.DefaultHash)}
+	}
+
+	e.Subkeys = make([]Subkey, 1)
+	e.Subkeys[0] = Subkey{
+		PublicKey:  packet.NewRSAPublicKey(currentTime, &encryptingPriv.PublicKey),
+		PrivateKey: packet.NewRSAPrivateKey(currentTime, encryptingPriv),
+		Sig: &packet.Signature{
+			CreationTime:              currentTime,
+			SigType:                   packet.SigTypeSubkeyBinding,
+			PubKeyAlgo:                packet.PubKeyAlgoRSA,
+			Hash:                      config.Hash(),
+			FlagsValid:                true,
+			FlagEncryptStorage:        true,
+			FlagEncryptCommunications: true,
+			IssuerKeyId:               &e.PrimaryKey.KeyId,
+		},
+	}
+	e.Subkeys[0].PublicKey.IsSubkey = true
+	e.Subkeys[0].PrivateKey.IsSubkey = true
+
+	return e, nil
+}
+
+// SerializePrivate serializes an Entity, including private key material, to
+// the given Writer. For now, it must only be used on an Entity returned from
+// NewEntity.
+// If config is nil, sensible defaults will be used.
+func (e *Entity) SerializePrivate(w io.Writer, config *packet.Config) (err error) {
+	err = e.PrivateKey.Serialize(w)
+	if err != nil {
+		return
+	}
+	for _, ident := range e.Identities {
+		err = ident.UserId.Serialize(w)
+		if err != nil {
+			return
+		}
+		err = ident.SelfSignature.SignUserId(ident.UserId.Id, e.PrimaryKey, e.PrivateKey, config)
+		if err != nil {
+			return
+		}
+		err = ident.SelfSignature.Serialize(w)
+		if err != nil {
+			return
+		}
+	}
+	for _, subkey := range e.Subkeys {
+		err = subkey.PrivateKey.Serialize(w)
+		if err != nil {
+			return
+		}
+		err = subkey.Sig.SignKey(subkey.PublicKey, e.PrivateKey, config)
+		if err != nil {
+			return
+		}
+		err = subkey.Sig.Serialize(w)
+		if err != nil {
+			return
+		}
+	}
+	return nil
+}
+
+// Serialize writes the public part of the given Entity to w. (No private
+// key material will be output).
+func (e *Entity) Serialize(w io.Writer) error {
+	err := e.PrimaryKey.Serialize(w)
+	if err != nil {
+		return err
+	}
+	for _, ident := range e.Identities {
+		err = ident.UserId.Serialize(w)
+		if err != nil {
+			return err
+		}
+		err = ident.SelfSignature.Serialize(w)
+		if err != nil {
+			return err
+		}
+		for _, sig := range ident.Signatures {
+			err = sig.Serialize(w)
+			if err != nil {
+				return err
+			}
+		}
+	}
+	for _, subkey := range e.Subkeys {
+		err = subkey.PublicKey.Serialize(w)
+		if err != nil {
+			return err
+		}
+		err = subkey.Sig.Serialize(w)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// SignIdentity adds a signature to e, from signer, attesting that identity is
+// associated with e. The provided identity must already be an element of
+// e.Identities and the private key of signer must have been decrypted if
+// necessary.
+// If config is nil, sensible defaults will be used.
+func (e *Entity) SignIdentity(identity string, signer *Entity, config *packet.Config) error {
+	if signer.PrivateKey == nil {
+		return errors.InvalidArgumentError("signing Entity must have a private key")
+	}
+	if signer.PrivateKey.Encrypted {
+		return errors.InvalidArgumentError("signing Entity's private key must be decrypted")
+	}
+	ident, ok := e.Identities[identity]
+	if !ok {
+		return errors.InvalidArgumentError("given identity string not found in Entity")
+	}
+
+	sig := &packet.Signature{
+		SigType:      packet.SigTypeGenericCert,
+		PubKeyAlgo:   signer.PrivateKey.PubKeyAlgo,
+		Hash:         config.Hash(),
+		CreationTime: config.Now(),
+		IssuerKeyId:  &signer.PrivateKey.KeyId,
+	}
+	if err := sig.SignUserId(identity, e.PrimaryKey, signer.PrivateKey, config); err != nil {
+		return err
+	}
+	ident.Signatures = append(ident.Signatures, sig)
+	return nil
+}

vendor/golang.org/x/crypto/openpgp/packet/compressed.go

@@ -0,0 +1,123 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"compress/bzip2"
+	"compress/flate"
+	"compress/zlib"
+	"golang.org/x/crypto/openpgp/errors"
+	"io"
+	"strconv"
+)
+
+// Compressed represents a compressed OpenPGP packet. The decompressed contents
+// will contain more OpenPGP packets. See RFC 4880, section 5.6.
+type Compressed struct {
+	Body io.Reader
+}
+
+const (
+	NoCompression      = flate.NoCompression
+	BestSpeed          = flate.BestSpeed
+	BestCompression    = flate.BestCompression
+	DefaultCompression = flate.DefaultCompression
+)
+
+// CompressionConfig contains compressor configuration settings.
+type CompressionConfig struct {
+	// Level is the compression level to use. It must be set to
+	// between -1 and 9, with -1 causing the compressor to use the
+	// default compression level, 0 causing the compressor to use
+	// no compression and 1 to 9 representing increasing (better,
+	// slower) compression levels. If Level is less than -1 or
+	// more then 9, a non-nil error will be returned during
+	// encryption. See the constants above for convenient common
+	// settings for Level.
+	Level int
+}
+
+func (c *Compressed) parse(r io.Reader) error {
+	var buf [1]byte
+	_, err := readFull(r, buf[:])
+	if err != nil {
+		return err
+	}
+
+	switch buf[0] {
+	case 1:
+		c.Body = flate.NewReader(r)
+	case 2:
+		c.Body, err = zlib.NewReader(r)
+	case 3:
+		c.Body = bzip2.NewReader(r)
+	default:
+		err = errors.UnsupportedError("unknown compression algorithm: " + strconv.Itoa(int(buf[0])))
+	}
+
+	return err
+}
+
+// compressedWriterCloser represents the serialized compression stream
+// header and the compressor. Its Close() method ensures that both the
+// compressor and serialized stream header are closed. Its Write()
+// method writes to the compressor.
+type compressedWriteCloser struct {
+	sh io.Closer      // Stream Header
+	c  io.WriteCloser // Compressor
+}
+
+func (cwc compressedWriteCloser) Write(p []byte) (int, error) {
+	return cwc.c.Write(p)
+}
+
+func (cwc compressedWriteCloser) Close() (err error) {
+	err = cwc.c.Close()
+	if err != nil {
+		return err
+	}
+
+	return cwc.sh.Close()
+}
+
+// SerializeCompressed serializes a compressed data packet to w and
+// returns a WriteCloser to which the literal data packets themselves
+// can be written and which MUST be closed on completion. If cc is
+// nil, sensible defaults will be used to configure the compression
+// algorithm.
+func SerializeCompressed(w io.WriteCloser, algo CompressionAlgo, cc *CompressionConfig) (literaldata io.WriteCloser, err error) {
+	compressed, err := serializeStreamHeader(w, packetTypeCompressed)
+	if err != nil {
+		return
+	}
+
+	_, err = compressed.Write([]byte{uint8(algo)})
+	if err != nil {
+		return
+	}
+
+	level := DefaultCompression
+	if cc != nil {
+		level = cc.Level
+	}
+
+	var compressor io.WriteCloser
+	switch algo {
+	case CompressionZIP:
+		compressor, err = flate.NewWriter(compressed, level)
+	case CompressionZLIB:
+		compressor, err = zlib.NewWriterLevel(compressed, level)
+	default:
+		s := strconv.Itoa(int(algo))
+		err = errors.UnsupportedError("Unsupported compression algorithm: " + s)
+	}
+	if err != nil {
+		return
+	}
+
+	literaldata = compressedWriteCloser{compressed, compressor}
+
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/config.go

@@ -0,0 +1,91 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"crypto"
+	"crypto/rand"
+	"io"
+	"time"
+)
+
+// Config collects a number of parameters along with sensible defaults.
+// A nil *Config is valid and results in all default values.
+type Config struct {
+	// Rand provides the source of entropy.
+	// If nil, the crypto/rand Reader is used.
+	Rand io.Reader
+	// DefaultHash is the default hash function to be used.
+	// If zero, SHA-256 is used.
+	DefaultHash crypto.Hash
+	// DefaultCipher is the cipher to be used.
+	// If zero, AES-128 is used.
+	DefaultCipher CipherFunction
+	// Time returns the current time as the number of seconds since the
+	// epoch. If Time is nil, time.Now is used.
+	Time func() time.Time
+	// DefaultCompressionAlgo is the compression algorithm to be
+	// applied to the plaintext before encryption. If zero, no
+	// compression is done.
+	DefaultCompressionAlgo CompressionAlgo
+	// CompressionConfig configures the compression settings.
+	CompressionConfig *CompressionConfig
+	// S2KCount is only used for symmetric encryption. It
+	// determines the strength of the passphrase stretching when
+	// the said passphrase is hashed to produce a key. S2KCount
+	// should be between 1024 and 65011712, inclusive. If Config
+	// is nil or S2KCount is 0, the value 65536 used. Not all
+	// values in the above range can be represented. S2KCount will
+	// be rounded up to the next representable value if it cannot
+	// be encoded exactly. When set, it is strongly encrouraged to
+	// use a value that is at least 65536. See RFC 4880 Section
+	// 3.7.1.3.
+	S2KCount int
+	// RSABits is the number of bits in new RSA keys made with NewEntity.
+	// If zero, then 2048 bit keys are created.
+	RSABits int
+}
+
+func (c *Config) Random() io.Reader {
+	if c == nil || c.Rand == nil {
+		return rand.Reader
+	}
+	return c.Rand
+}
+
+func (c *Config) Hash() crypto.Hash {
+	if c == nil || uint(c.DefaultHash) == 0 {
+		return crypto.SHA256
+	}
+	return c.DefaultHash
+}
+
+func (c *Config) Cipher() CipherFunction {
+	if c == nil || uint8(c.DefaultCipher) == 0 {
+		return CipherAES128
+	}
+	return c.DefaultCipher
+}
+
+func (c *Config) Now() time.Time {
+	if c == nil || c.Time == nil {
+		return time.Now()
+	}
+	return c.Time()
+}
+
+func (c *Config) Compression() CompressionAlgo {
+	if c == nil {
+		return CompressionNone
+	}
+	return c.DefaultCompressionAlgo
+}
+
+func (c *Config) PasswordHashIterations() int {
+	if c == nil || c.S2KCount == 0 {
+		return 0
+	}
+	return c.S2KCount
+}

vendor/golang.org/x/crypto/openpgp/packet/encrypted_key.go

@@ -0,0 +1,199 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"crypto/rsa"
+	"encoding/binary"
+	"io"
+	"math/big"
+	"strconv"
+
+	"golang.org/x/crypto/openpgp/elgamal"
+	"golang.org/x/crypto/openpgp/errors"
+)
+
+const encryptedKeyVersion = 3
+
+// EncryptedKey represents a public-key encrypted session key. See RFC 4880,
+// section 5.1.
+type EncryptedKey struct {
+	KeyId      uint64
+	Algo       PublicKeyAlgorithm
+	CipherFunc CipherFunction // only valid after a successful Decrypt
+	Key        []byte         // only valid after a successful Decrypt
+
+	encryptedMPI1, encryptedMPI2 parsedMPI
+}
+
+func (e *EncryptedKey) parse(r io.Reader) (err error) {
+	var buf [10]byte
+	_, err = readFull(r, buf[:])
+	if err != nil {
+		return
+	}
+	if buf[0] != encryptedKeyVersion {
+		return errors.UnsupportedError("unknown EncryptedKey version " + strconv.Itoa(int(buf[0])))
+	}
+	e.KeyId = binary.BigEndian.Uint64(buf[1:9])
+	e.Algo = PublicKeyAlgorithm(buf[9])
+	switch e.Algo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		e.encryptedMPI1.bytes, e.encryptedMPI1.bitLength, err = readMPI(r)
+	case PubKeyAlgoElGamal:
+		e.encryptedMPI1.bytes, e.encryptedMPI1.bitLength, err = readMPI(r)
+		if err != nil {
+			return
+		}
+		e.encryptedMPI2.bytes, e.encryptedMPI2.bitLength, err = readMPI(r)
+	}
+	_, err = consumeAll(r)
+	return
+}
+
+func checksumKeyMaterial(key []byte) uint16 {
+	var checksum uint16
+	for _, v := range key {
+		checksum += uint16(v)
+	}
+	return checksum
+}
+
+// Decrypt decrypts an encrypted session key with the given private key. The
+// private key must have been decrypted first.
+// If config is nil, sensible defaults will be used.
+func (e *EncryptedKey) Decrypt(priv *PrivateKey, config *Config) error {
+	var err error
+	var b []byte
+
+	// TODO(agl): use session key decryption routines here to avoid
+	// padding oracle attacks.
+	switch priv.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		b, err = rsa.DecryptPKCS1v15(config.Random(), priv.PrivateKey.(*rsa.PrivateKey), e.encryptedMPI1.bytes)
+	case PubKeyAlgoElGamal:
+		c1 := new(big.Int).SetBytes(e.encryptedMPI1.bytes)
+		c2 := new(big.Int).SetBytes(e.encryptedMPI2.bytes)
+		b, err = elgamal.Decrypt(priv.PrivateKey.(*elgamal.PrivateKey), c1, c2)
+	default:
+		err = errors.InvalidArgumentError("cannot decrypted encrypted session key with private key of type " + strconv.Itoa(int(priv.PubKeyAlgo)))
+	}
+
+	if err != nil {
+		return err
+	}
+
+	e.CipherFunc = CipherFunction(b[0])
+	e.Key = b[1 : len(b)-2]
+	expectedChecksum := uint16(b[len(b)-2])<<8 | uint16(b[len(b)-1])
+	checksum := checksumKeyMaterial(e.Key)
+	if checksum != expectedChecksum {
+		return errors.StructuralError("EncryptedKey checksum incorrect")
+	}
+
+	return nil
+}
+
+// Serialize writes the encrypted key packet, e, to w.
+func (e *EncryptedKey) Serialize(w io.Writer) error {
+	var mpiLen int
+	switch e.Algo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		mpiLen = 2 + len(e.encryptedMPI1.bytes)
+	case PubKeyAlgoElGamal:
+		mpiLen = 2 + len(e.encryptedMPI1.bytes) + 2 + len(e.encryptedMPI2.bytes)
+	default:
+		return errors.InvalidArgumentError("don't know how to serialize encrypted key type " + strconv.Itoa(int(e.Algo)))
+	}
+
+	serializeHeader(w, packetTypeEncryptedKey, 1 /* version */ +8 /* key id */ +1 /* algo */ +mpiLen)
+
+	w.Write([]byte{encryptedKeyVersion})
+	binary.Write(w, binary.BigEndian, e.KeyId)
+	w.Write([]byte{byte(e.Algo)})
+
+	switch e.Algo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		writeMPIs(w, e.encryptedMPI1)
+	case PubKeyAlgoElGamal:
+		writeMPIs(w, e.encryptedMPI1, e.encryptedMPI2)
+	default:
+		panic("internal error")
+	}
+
+	return nil
+}
+
+// SerializeEncryptedKey serializes an encrypted key packet to w that contains
+// key, encrypted to pub.
+// If config is nil, sensible defaults will be used.
+func SerializeEncryptedKey(w io.Writer, pub *PublicKey, cipherFunc CipherFunction, key []byte, config *Config) error {
+	var buf [10]byte
+	buf[0] = encryptedKeyVersion
+	binary.BigEndian.PutUint64(buf[1:9], pub.KeyId)
+	buf[9] = byte(pub.PubKeyAlgo)
+
+	keyBlock := make([]byte, 1 /* cipher type */ +len(key)+2 /* checksum */)
+	keyBlock[0] = byte(cipherFunc)
+	copy(keyBlock[1:], key)
+	checksum := checksumKeyMaterial(key)
+	keyBlock[1+len(key)] = byte(checksum >> 8)
+	keyBlock[1+len(key)+1] = byte(checksum)
+
+	switch pub.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly:
+		return serializeEncryptedKeyRSA(w, config.Random(), buf, pub.PublicKey.(*rsa.PublicKey), keyBlock)
+	case PubKeyAlgoElGamal:
+		return serializeEncryptedKeyElGamal(w, config.Random(), buf, pub.PublicKey.(*elgamal.PublicKey), keyBlock)
+	case PubKeyAlgoDSA, PubKeyAlgoRSASignOnly:
+		return errors.InvalidArgumentError("cannot encrypt to public key of type " + strconv.Itoa(int(pub.PubKeyAlgo)))
+	}
+
+	return errors.UnsupportedError("encrypting a key to public key of type " + strconv.Itoa(int(pub.PubKeyAlgo)))
+}
+
+func serializeEncryptedKeyRSA(w io.Writer, rand io.Reader, header [10]byte, pub *rsa.PublicKey, keyBlock []byte) error {
+	cipherText, err := rsa.EncryptPKCS1v15(rand, pub, keyBlock)
+	if err != nil {
+		return errors.InvalidArgumentError("RSA encryption failed: " + err.Error())
+	}
+
+	packetLen := 10 /* header length */ + 2 /* mpi size */ + len(cipherText)
+
+	err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(header[:])
+	if err != nil {
+		return err
+	}
+	return writeMPI(w, 8*uint16(len(cipherText)), cipherText)
+}
+
+func serializeEncryptedKeyElGamal(w io.Writer, rand io.Reader, header [10]byte, pub *elgamal.PublicKey, keyBlock []byte) error {
+	c1, c2, err := elgamal.Encrypt(rand, pub, keyBlock)
+	if err != nil {
+		return errors.InvalidArgumentError("ElGamal encryption failed: " + err.Error())
+	}
+
+	packetLen := 10 /* header length */
+	packetLen += 2 /* mpi size */ + (c1.BitLen()+7)/8
+	packetLen += 2 /* mpi size */ + (c2.BitLen()+7)/8
+
+	err = serializeHeader(w, packetTypeEncryptedKey, packetLen)
+	if err != nil {
+		return err
+	}
+	_, err = w.Write(header[:])
+	if err != nil {
+		return err
+	}
+	err = writeBig(w, c1)
+	if err != nil {
+		return err
+	}
+	return writeBig(w, c2)
+}

vendor/golang.org/x/crypto/openpgp/packet/literal.go

@@ -0,0 +1,89 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"encoding/binary"
+	"io"
+)
+
+// LiteralData represents an encrypted file. See RFC 4880, section 5.9.
+type LiteralData struct {
+	IsBinary bool
+	FileName string
+	Time     uint32 // Unix epoch time. Either creation time or modification time. 0 means undefined.
+	Body     io.Reader
+}
+
+// ForEyesOnly returns whether the contents of the LiteralData have been marked
+// as especially sensitive.
+func (l *LiteralData) ForEyesOnly() bool {
+	return l.FileName == "_CONSOLE"
+}
+
+func (l *LiteralData) parse(r io.Reader) (err error) {
+	var buf [256]byte
+
+	_, err = readFull(r, buf[:2])
+	if err != nil {
+		return
+	}
+
+	l.IsBinary = buf[0] == 'b'
+	fileNameLen := int(buf[1])
+
+	_, err = readFull(r, buf[:fileNameLen])
+	if err != nil {
+		return
+	}
+
+	l.FileName = string(buf[:fileNameLen])
+
+	_, err = readFull(r, buf[:4])
+	if err != nil {
+		return
+	}
+
+	l.Time = binary.BigEndian.Uint32(buf[:4])
+	l.Body = r
+	return
+}
+
+// SerializeLiteral serializes a literal data packet to w and returns a
+// WriteCloser to which the data itself can be written and which MUST be closed
+// on completion. The fileName is truncated to 255 bytes.
+func SerializeLiteral(w io.WriteCloser, isBinary bool, fileName string, time uint32) (plaintext io.WriteCloser, err error) {
+	var buf [4]byte
+	buf[0] = 't'
+	if isBinary {
+		buf[0] = 'b'
+	}
+	if len(fileName) > 255 {
+		fileName = fileName[:255]
+	}
+	buf[1] = byte(len(fileName))
+
+	inner, err := serializeStreamHeader(w, packetTypeLiteralData)
+	if err != nil {
+		return
+	}
+
+	_, err = inner.Write(buf[:2])
+	if err != nil {
+		return
+	}
+	_, err = inner.Write([]byte(fileName))
+	if err != nil {
+		return
+	}
+	binary.BigEndian.PutUint32(buf[:], time)
+	_, err = inner.Write(buf[:])
+	if err != nil {
+		return
+	}
+
+	plaintext = inner
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/ocfb.go

@@ -0,0 +1,143 @@
+// Copyright 2010 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// OpenPGP CFB Mode. http://tools.ietf.org/html/rfc4880#section-13.9
+
+package packet
+
+import (
+	"crypto/cipher"
+)
+
+type ocfbEncrypter struct {
+	b       cipher.Block
+	fre     []byte
+	outUsed int
+}
+
+// An OCFBResyncOption determines if the "resynchronization step" of OCFB is
+// performed.
+type OCFBResyncOption bool
+
+const (
+	OCFBResync   OCFBResyncOption = true
+	OCFBNoResync OCFBResyncOption = false
+)
+
+// NewOCFBEncrypter returns a cipher.Stream which encrypts data with OpenPGP's
+// cipher feedback mode using the given cipher.Block, and an initial amount of
+// ciphertext.  randData must be random bytes and be the same length as the
+// cipher.Block's block size. Resync determines if the "resynchronization step"
+// from RFC 4880, 13.9 step 7 is performed. Different parts of OpenPGP vary on
+// this point.
+func NewOCFBEncrypter(block cipher.Block, randData []byte, resync OCFBResyncOption) (cipher.Stream, []byte) {
+	blockSize := block.BlockSize()
+	if len(randData) != blockSize {
+		return nil, nil
+	}
+
+	x := &ocfbEncrypter{
+		b:       block,
+		fre:     make([]byte, blockSize),
+		outUsed: 0,
+	}
+	prefix := make([]byte, blockSize+2)
+
+	block.Encrypt(x.fre, x.fre)
+	for i := 0; i < blockSize; i++ {
+		prefix[i] = randData[i] ^ x.fre[i]
+	}
+
+	block.Encrypt(x.fre, prefix[:blockSize])
+	prefix[blockSize] = x.fre[0] ^ randData[blockSize-2]
+	prefix[blockSize+1] = x.fre[1] ^ randData[blockSize-1]
+
+	if resync {
+		block.Encrypt(x.fre, prefix[2:])
+	} else {
+		x.fre[0] = prefix[blockSize]
+		x.fre[1] = prefix[blockSize+1]
+		x.outUsed = 2
+	}
+	return x, prefix
+}
+
+func (x *ocfbEncrypter) XORKeyStream(dst, src []byte) {
+	for i := 0; i < len(src); i++ {
+		if x.outUsed == len(x.fre) {
+			x.b.Encrypt(x.fre, x.fre)
+			x.outUsed = 0
+		}
+
+		x.fre[x.outUsed] ^= src[i]
+		dst[i] = x.fre[x.outUsed]
+		x.outUsed++
+	}
+}
+
+type ocfbDecrypter struct {
+	b       cipher.Block
+	fre     []byte
+	outUsed int
+}
+
+// NewOCFBDecrypter returns a cipher.Stream which decrypts data with OpenPGP's
+// cipher feedback mode using the given cipher.Block. Prefix must be the first
+// blockSize + 2 bytes of the ciphertext, where blockSize is the cipher.Block's
+// block size. If an incorrect key is detected then nil is returned. On
+// successful exit, blockSize+2 bytes of decrypted data are written into
+// prefix. Resync determines if the "resynchronization step" from RFC 4880,
+// 13.9 step 7 is performed. Different parts of OpenPGP vary on this point.
+func NewOCFBDecrypter(block cipher.Block, prefix []byte, resync OCFBResyncOption) cipher.Stream {
+	blockSize := block.BlockSize()
+	if len(prefix) != blockSize+2 {
+		return nil
+	}
+
+	x := &ocfbDecrypter{
+		b:       block,
+		fre:     make([]byte, blockSize),
+		outUsed: 0,
+	}
+	prefixCopy := make([]byte, len(prefix))
+	copy(prefixCopy, prefix)
+
+	block.Encrypt(x.fre, x.fre)
+	for i := 0; i < blockSize; i++ {
+		prefixCopy[i] ^= x.fre[i]
+	}
+
+	block.Encrypt(x.fre, prefix[:blockSize])
+	prefixCopy[blockSize] ^= x.fre[0]
+	prefixCopy[blockSize+1] ^= x.fre[1]
+
+	if prefixCopy[blockSize-2] != prefixCopy[blockSize] ||
+		prefixCopy[blockSize-1] != prefixCopy[blockSize+1] {
+		return nil
+	}
+
+	if resync {
+		block.Encrypt(x.fre, prefix[2:])
+	} else {
+		x.fre[0] = prefix[blockSize]
+		x.fre[1] = prefix[blockSize+1]
+		x.outUsed = 2
+	}
+	copy(prefix, prefixCopy)
+	return x
+}
+
+func (x *ocfbDecrypter) XORKeyStream(dst, src []byte) {
+	for i := 0; i < len(src); i++ {
+		if x.outUsed == len(x.fre) {
+			x.b.Encrypt(x.fre, x.fre)
+			x.outUsed = 0
+		}
+
+		c := src[i]
+		dst[i] = x.fre[x.outUsed] ^ src[i]
+		x.fre[x.outUsed] = c
+		x.outUsed++
+	}
+}

vendor/golang.org/x/crypto/openpgp/packet/one_pass_signature.go

@@ -0,0 +1,73 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"crypto"
+	"encoding/binary"
+	"golang.org/x/crypto/openpgp/errors"
+	"golang.org/x/crypto/openpgp/s2k"
+	"io"
+	"strconv"
+)
+
+// OnePassSignature represents a one-pass signature packet. See RFC 4880,
+// section 5.4.
+type OnePassSignature struct {
+	SigType    SignatureType
+	Hash       crypto.Hash
+	PubKeyAlgo PublicKeyAlgorithm
+	KeyId      uint64
+	IsLast     bool
+}
+
+const onePassSignatureVersion = 3
+
+func (ops *OnePassSignature) parse(r io.Reader) (err error) {
+	var buf [13]byte
+
+	_, err = readFull(r, buf[:])
+	if err != nil {
+		return
+	}
+	if buf[0] != onePassSignatureVersion {
+		err = errors.UnsupportedError("one-pass-signature packet version " + strconv.Itoa(int(buf[0])))
+	}
+
+	var ok bool
+	ops.Hash, ok = s2k.HashIdToHash(buf[2])
+	if !ok {
+		return errors.UnsupportedError("hash function: " + strconv.Itoa(int(buf[2])))
+	}
+
+	ops.SigType = SignatureType(buf[1])
+	ops.PubKeyAlgo = PublicKeyAlgorithm(buf[3])
+	ops.KeyId = binary.BigEndian.Uint64(buf[4:12])
+	ops.IsLast = buf[12] != 0
+	return
+}
+
+// Serialize marshals the given OnePassSignature to w.
+func (ops *OnePassSignature) Serialize(w io.Writer) error {
+	var buf [13]byte
+	buf[0] = onePassSignatureVersion
+	buf[1] = uint8(ops.SigType)
+	var ok bool
+	buf[2], ok = s2k.HashToHashId(ops.Hash)
+	if !ok {
+		return errors.UnsupportedError("hash type: " + strconv.Itoa(int(ops.Hash)))
+	}
+	buf[3] = uint8(ops.PubKeyAlgo)
+	binary.BigEndian.PutUint64(buf[4:12], ops.KeyId)
+	if ops.IsLast {
+		buf[12] = 1
+	}
+
+	if err := serializeHeader(w, packetTypeOnePassSignature, len(buf)); err != nil {
+		return err
+	}
+	_, err := w.Write(buf[:])
+	return err
+}

vendor/golang.org/x/crypto/openpgp/packet/opaque.go

@@ -0,0 +1,162 @@
+// Copyright 2012 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"bytes"
+	"io"
+	"io/ioutil"
+
+	"golang.org/x/crypto/openpgp/errors"
+)
+
+// OpaquePacket represents an OpenPGP packet as raw, unparsed data. This is
+// useful for splitting and storing the original packet contents separately,
+// handling unsupported packet types or accessing parts of the packet not yet
+// implemented by this package.
+type OpaquePacket struct {
+	// Packet type
+	Tag uint8
+	// Reason why the packet was parsed opaquely
+	Reason error
+	// Binary contents of the packet data
+	Contents []byte
+}
+
+func (op *OpaquePacket) parse(r io.Reader) (err error) {
+	op.Contents, err = ioutil.ReadAll(r)
+	return
+}
+
+// Serialize marshals the packet to a writer in its original form, including
+// the packet header.
+func (op *OpaquePacket) Serialize(w io.Writer) (err error) {
+	err = serializeHeader(w, packetType(op.Tag), len(op.Contents))
+	if err == nil {
+		_, err = w.Write(op.Contents)
+	}
+	return
+}
+
+// Parse attempts to parse the opaque contents into a structure supported by
+// this package. If the packet is not known then the result will be another
+// OpaquePacket.
+func (op *OpaquePacket) Parse() (p Packet, err error) {
+	hdr := bytes.NewBuffer(nil)
+	err = serializeHeader(hdr, packetType(op.Tag), len(op.Contents))
+	if err != nil {
+		op.Reason = err
+		return op, err
+	}
+	p, err = Read(io.MultiReader(hdr, bytes.NewBuffer(op.Contents)))
+	if err != nil {
+		op.Reason = err
+		p = op
+	}
+	return
+}
+
+// OpaqueReader reads OpaquePackets from an io.Reader.
+type OpaqueReader struct {
+	r io.Reader
+}
+
+func NewOpaqueReader(r io.Reader) *OpaqueReader {
+	return &OpaqueReader{r: r}
+}
+
+// Read the next OpaquePacket.
+func (or *OpaqueReader) Next() (op *OpaquePacket, err error) {
+	tag, _, contents, err := readHeader(or.r)
+	if err != nil {
+		return
+	}
+	op = &OpaquePacket{Tag: uint8(tag), Reason: err}
+	err = op.parse(contents)
+	if err != nil {
+		consumeAll(contents)
+	}
+	return
+}
+
+// OpaqueSubpacket represents an unparsed OpenPGP subpacket,
+// as found in signature and user attribute packets.
+type OpaqueSubpacket struct {
+	SubType  uint8
+	Contents []byte
+}
+
+// OpaqueSubpackets extracts opaque, unparsed OpenPGP subpackets from
+// their byte representation.
+func OpaqueSubpackets(contents []byte) (result []*OpaqueSubpacket, err error) {
+	var (
+		subHeaderLen int
+		subPacket    *OpaqueSubpacket
+	)
+	for len(contents) > 0 {
+		subHeaderLen, subPacket, err = nextSubpacket(contents)
+		if err != nil {
+			break
+		}
+		result = append(result, subPacket)
+		contents = contents[subHeaderLen+len(subPacket.Contents):]
+	}
+	return
+}
+
+func nextSubpacket(contents []byte) (subHeaderLen int, subPacket *OpaqueSubpacket, err error) {
+	// RFC 4880, section 5.2.3.1
+	var subLen uint32
+	if len(contents) < 1 {
+		goto Truncated
+	}
+	subPacket = &OpaqueSubpacket{}
+	switch {
+	case contents[0] < 192:
+		subHeaderLen = 2 // 1 length byte, 1 subtype byte
+		if len(contents) < subHeaderLen {
+			goto Truncated
+		}
+		subLen = uint32(contents[0])
+		contents = contents[1:]
+	case contents[0] < 255:
+		subHeaderLen = 3 // 2 length bytes, 1 subtype
+		if len(contents) < subHeaderLen {
+			goto Truncated
+		}
+		subLen = uint32(contents[0]-192)<<8 + uint32(contents[1]) + 192
+		contents = contents[2:]
+	default:
+		subHeaderLen = 6 // 5 length bytes, 1 subtype
+		if len(contents) < subHeaderLen {
+			goto Truncated
+		}
+		subLen = uint32(contents[1])<<24 |
+			uint32(contents[2])<<16 |
+			uint32(contents[3])<<8 |
+			uint32(contents[4])
+		contents = contents[5:]
+	}
+	if subLen > uint32(len(contents)) || subLen == 0 {
+		goto Truncated
+	}
+	subPacket.SubType = contents[0]
+	subPacket.Contents = contents[1:subLen]
+	return
+Truncated:
+	err = errors.StructuralError("subpacket truncated")
+	return
+}
+
+func (osp *OpaqueSubpacket) Serialize(w io.Writer) (err error) {
+	buf := make([]byte, 6)
+	n := serializeSubpacketLength(buf, len(osp.Contents)+1)
+	buf[n] = osp.SubType
+	if _, err = w.Write(buf[:n+1]); err != nil {
+		return
+	}
+	_, err = w.Write(osp.Contents)
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/packet.go

@@ -0,0 +1,537 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package packet implements parsing and serialization of OpenPGP packets, as
+// specified in RFC 4880.
+package packet // import "golang.org/x/crypto/openpgp/packet"
+
+import (
+	"bufio"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/des"
+	"golang.org/x/crypto/cast5"
+	"golang.org/x/crypto/openpgp/errors"
+	"io"
+	"math/big"
+)
+
+// readFull is the same as io.ReadFull except that reading zero bytes returns
+// ErrUnexpectedEOF rather than EOF.
+func readFull(r io.Reader, buf []byte) (n int, err error) {
+	n, err = io.ReadFull(r, buf)
+	if err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	return
+}
+
+// readLength reads an OpenPGP length from r. See RFC 4880, section 4.2.2.
+func readLength(r io.Reader) (length int64, isPartial bool, err error) {
+	var buf [4]byte
+	_, err = readFull(r, buf[:1])
+	if err != nil {
+		return
+	}
+	switch {
+	case buf[0] < 192:
+		length = int64(buf[0])
+	case buf[0] < 224:
+		length = int64(buf[0]-192) << 8
+		_, err = readFull(r, buf[0:1])
+		if err != nil {
+			return
+		}
+		length += int64(buf[0]) + 192
+	case buf[0] < 255:
+		length = int64(1) << (buf[0] & 0x1f)
+		isPartial = true
+	default:
+		_, err = readFull(r, buf[0:4])
+		if err != nil {
+			return
+		}
+		length = int64(buf[0])<<24 |
+			int64(buf[1])<<16 |
+			int64(buf[2])<<8 |
+			int64(buf[3])
+	}
+	return
+}
+
+// partialLengthReader wraps an io.Reader and handles OpenPGP partial lengths.
+// The continuation lengths are parsed and removed from the stream and EOF is
+// returned at the end of the packet. See RFC 4880, section 4.2.2.4.
+type partialLengthReader struct {
+	r         io.Reader
+	remaining int64
+	isPartial bool
+}
+
+func (r *partialLengthReader) Read(p []byte) (n int, err error) {
+	for r.remaining == 0 {
+		if !r.isPartial {
+			return 0, io.EOF
+		}
+		r.remaining, r.isPartial, err = readLength(r.r)
+		if err != nil {
+			return 0, err
+		}
+	}
+
+	toRead := int64(len(p))
+	if toRead > r.remaining {
+		toRead = r.remaining
+	}
+
+	n, err = r.r.Read(p[:int(toRead)])
+	r.remaining -= int64(n)
+	if n < int(toRead) && err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	return
+}
+
+// partialLengthWriter writes a stream of data using OpenPGP partial lengths.
+// See RFC 4880, section 4.2.2.4.
+type partialLengthWriter struct {
+	w          io.WriteCloser
+	lengthByte [1]byte
+}
+
+func (w *partialLengthWriter) Write(p []byte) (n int, err error) {
+	for len(p) > 0 {
+		for power := uint(14); power < 32; power-- {
+			l := 1 << power
+			if len(p) >= l {
+				w.lengthByte[0] = 224 + uint8(power)
+				_, err = w.w.Write(w.lengthByte[:])
+				if err != nil {
+					return
+				}
+				var m int
+				m, err = w.w.Write(p[:l])
+				n += m
+				if err != nil {
+					return
+				}
+				p = p[l:]
+				break
+			}
+		}
+	}
+	return
+}
+
+func (w *partialLengthWriter) Close() error {
+	w.lengthByte[0] = 0
+	_, err := w.w.Write(w.lengthByte[:])
+	if err != nil {
+		return err
+	}
+	return w.w.Close()
+}
+
+// A spanReader is an io.LimitReader, but it returns ErrUnexpectedEOF if the
+// underlying Reader returns EOF before the limit has been reached.
+type spanReader struct {
+	r io.Reader
+	n int64
+}
+
+func (l *spanReader) Read(p []byte) (n int, err error) {
+	if l.n <= 0 {
+		return 0, io.EOF
+	}
+	if int64(len(p)) > l.n {
+		p = p[0:l.n]
+	}
+	n, err = l.r.Read(p)
+	l.n -= int64(n)
+	if l.n > 0 && err == io.EOF {
+		err = io.ErrUnexpectedEOF
+	}
+	return
+}
+
+// readHeader parses a packet header and returns an io.Reader which will return
+// the contents of the packet. See RFC 4880, section 4.2.
+func readHeader(r io.Reader) (tag packetType, length int64, contents io.Reader, err error) {
+	var buf [4]byte
+	_, err = io.ReadFull(r, buf[:1])
+	if err != nil {
+		return
+	}
+	if buf[0]&0x80 == 0 {
+		err = errors.StructuralError("tag byte does not have MSB set")
+		return
+	}
+	if buf[0]&0x40 == 0 {
+		// Old format packet
+		tag = packetType((buf[0] & 0x3f) >> 2)
+		lengthType := buf[0] & 3
+		if lengthType == 3 {
+			length = -1
+			contents = r
+			return
+		}
+		lengthBytes := 1 << lengthType
+		_, err = readFull(r, buf[0:lengthBytes])
+		if err != nil {
+			return
+		}
+		for i := 0; i < lengthBytes; i++ {
+			length <<= 8
+			length |= int64(buf[i])
+		}
+		contents = &spanReader{r, length}
+		return
+	}
+
+	// New format packet
+	tag = packetType(buf[0] & 0x3f)
+	length, isPartial, err := readLength(r)
+	if err != nil {
+		return
+	}
+	if isPartial {
+		contents = &partialLengthReader{
+			remaining: length,
+			isPartial: true,
+			r:         r,
+		}
+		length = -1
+	} else {
+		contents = &spanReader{r, length}
+	}
+	return
+}
+
+// serializeHeader writes an OpenPGP packet header to w. See RFC 4880, section
+// 4.2.
+func serializeHeader(w io.Writer, ptype packetType, length int) (err error) {
+	var buf [6]byte
+	var n int
+
+	buf[0] = 0x80 | 0x40 | byte(ptype)
+	if length < 192 {
+		buf[1] = byte(length)
+		n = 2
+	} else if length < 8384 {
+		length -= 192
+		buf[1] = 192 + byte(length>>8)
+		buf[2] = byte(length)
+		n = 3
+	} else {
+		buf[1] = 255
+		buf[2] = byte(length >> 24)
+		buf[3] = byte(length >> 16)
+		buf[4] = byte(length >> 8)
+		buf[5] = byte(length)
+		n = 6
+	}
+
+	_, err = w.Write(buf[:n])
+	return
+}
+
+// serializeStreamHeader writes an OpenPGP packet header to w where the
+// length of the packet is unknown. It returns a io.WriteCloser which can be
+// used to write the contents of the packet. See RFC 4880, section 4.2.
+func serializeStreamHeader(w io.WriteCloser, ptype packetType) (out io.WriteCloser, err error) {
+	var buf [1]byte
+	buf[0] = 0x80 | 0x40 | byte(ptype)
+	_, err = w.Write(buf[:])
+	if err != nil {
+		return
+	}
+	out = &partialLengthWriter{w: w}
+	return
+}
+
+// Packet represents an OpenPGP packet. Users are expected to try casting
+// instances of this interface to specific packet types.
+type Packet interface {
+	parse(io.Reader) error
+}
+
+// consumeAll reads from the given Reader until error, returning the number of
+// bytes read.
+func consumeAll(r io.Reader) (n int64, err error) {
+	var m int
+	var buf [1024]byte
+
+	for {
+		m, err = r.Read(buf[:])
+		n += int64(m)
+		if err == io.EOF {
+			err = nil
+			return
+		}
+		if err != nil {
+			return
+		}
+	}
+}
+
+// packetType represents the numeric ids of the different OpenPGP packet types. See
+// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-2
+type packetType uint8
+
+const (
+	packetTypeEncryptedKey              packetType = 1
+	packetTypeSignature                 packetType = 2
+	packetTypeSymmetricKeyEncrypted     packetType = 3
+	packetTypeOnePassSignature          packetType = 4
+	packetTypePrivateKey                packetType = 5
+	packetTypePublicKey                 packetType = 6
+	packetTypePrivateSubkey             packetType = 7
+	packetTypeCompressed                packetType = 8
+	packetTypeSymmetricallyEncrypted    packetType = 9
+	packetTypeLiteralData               packetType = 11
+	packetTypeUserId                    packetType = 13
+	packetTypePublicSubkey              packetType = 14
+	packetTypeUserAttribute             packetType = 17
+	packetTypeSymmetricallyEncryptedMDC packetType = 18
+)
+
+// peekVersion detects the version of a public key packet about to
+// be read. A bufio.Reader at the original position of the io.Reader
+// is returned.
+func peekVersion(r io.Reader) (bufr *bufio.Reader, ver byte, err error) {
+	bufr = bufio.NewReader(r)
+	var verBuf []byte
+	if verBuf, err = bufr.Peek(1); err != nil {
+		return
+	}
+	ver = verBuf[0]
+	return
+}
+
+// Read reads a single OpenPGP packet from the given io.Reader. If there is an
+// error parsing a packet, the whole packet is consumed from the input.
+func Read(r io.Reader) (p Packet, err error) {
+	tag, _, contents, err := readHeader(r)
+	if err != nil {
+		return
+	}
+
+	switch tag {
+	case packetTypeEncryptedKey:
+		p = new(EncryptedKey)
+	case packetTypeSignature:
+		var version byte
+		// Detect signature version
+		if contents, version, err = peekVersion(contents); err != nil {
+			return
+		}
+		if version < 4 {
+			p = new(SignatureV3)
+		} else {
+			p = new(Signature)
+		}
+	case packetTypeSymmetricKeyEncrypted:
+		p = new(SymmetricKeyEncrypted)
+	case packetTypeOnePassSignature:
+		p = new(OnePassSignature)
+	case packetTypePrivateKey, packetTypePrivateSubkey:
+		pk := new(PrivateKey)
+		if tag == packetTypePrivateSubkey {
+			pk.IsSubkey = true
+		}
+		p = pk
+	case packetTypePublicKey, packetTypePublicSubkey:
+		var version byte
+		if contents, version, err = peekVersion(contents); err != nil {
+			return
+		}
+		isSubkey := tag == packetTypePublicSubkey
+		if version < 4 {
+			p = &PublicKeyV3{IsSubkey: isSubkey}
+		} else {
+			p = &PublicKey{IsSubkey: isSubkey}
+		}
+	case packetTypeCompressed:
+		p = new(Compressed)
+	case packetTypeSymmetricallyEncrypted:
+		p = new(SymmetricallyEncrypted)
+	case packetTypeLiteralData:
+		p = new(LiteralData)
+	case packetTypeUserId:
+		p = new(UserId)
+	case packetTypeUserAttribute:
+		p = new(UserAttribute)
+	case packetTypeSymmetricallyEncryptedMDC:
+		se := new(SymmetricallyEncrypted)
+		se.MDC = true
+		p = se
+	default:
+		err = errors.UnknownPacketTypeError(tag)
+	}
+	if p != nil {
+		err = p.parse(contents)
+	}
+	if err != nil {
+		consumeAll(contents)
+	}
+	return
+}
+
+// SignatureType represents the different semantic meanings of an OpenPGP
+// signature. See RFC 4880, section 5.2.1.
+type SignatureType uint8
+
+const (
+	SigTypeBinary            SignatureType = 0
+	SigTypeText                            = 1
+	SigTypeGenericCert                     = 0x10
+	SigTypePersonaCert                     = 0x11
+	SigTypeCasualCert                      = 0x12
+	SigTypePositiveCert                    = 0x13
+	SigTypeSubkeyBinding                   = 0x18
+	SigTypePrimaryKeyBinding               = 0x19
+	SigTypeDirectSignature                 = 0x1F
+	SigTypeKeyRevocation                   = 0x20
+	SigTypeSubkeyRevocation                = 0x28
+)
+
+// PublicKeyAlgorithm represents the different public key system specified for
+// OpenPGP. See
+// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-12
+type PublicKeyAlgorithm uint8
+
+const (
+	PubKeyAlgoRSA            PublicKeyAlgorithm = 1
+	PubKeyAlgoRSAEncryptOnly PublicKeyAlgorithm = 2
+	PubKeyAlgoRSASignOnly    PublicKeyAlgorithm = 3
+	PubKeyAlgoElGamal        PublicKeyAlgorithm = 16
+	PubKeyAlgoDSA            PublicKeyAlgorithm = 17
+	// RFC 6637, Section 5.
+	PubKeyAlgoECDH  PublicKeyAlgorithm = 18
+	PubKeyAlgoECDSA PublicKeyAlgorithm = 19
+)
+
+// CanEncrypt returns true if it's possible to encrypt a message to a public
+// key of the given type.
+func (pka PublicKeyAlgorithm) CanEncrypt() bool {
+	switch pka {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoElGamal:
+		return true
+	}
+	return false
+}
+
+// CanSign returns true if it's possible for a public key of the given type to
+// sign a message.
+func (pka PublicKeyAlgorithm) CanSign() bool {
+	switch pka {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA:
+		return true
+	}
+	return false
+}
+
+// CipherFunction represents the different block ciphers specified for OpenPGP. See
+// http://www.iana.org/assignments/pgp-parameters/pgp-parameters.xhtml#pgp-parameters-13
+type CipherFunction uint8
+
+const (
+	Cipher3DES   CipherFunction = 2
+	CipherCAST5  CipherFunction = 3
+	CipherAES128 CipherFunction = 7
+	CipherAES192 CipherFunction = 8
+	CipherAES256 CipherFunction = 9
+)
+
+// KeySize returns the key size, in bytes, of cipher.
+func (cipher CipherFunction) KeySize() int {
+	switch cipher {
+	case Cipher3DES:
+		return 24
+	case CipherCAST5:
+		return cast5.KeySize
+	case CipherAES128:
+		return 16
+	case CipherAES192:
+		return 24
+	case CipherAES256:
+		return 32
+	}
+	return 0
+}
+
+// blockSize returns the block size, in bytes, of cipher.
+func (cipher CipherFunction) blockSize() int {
+	switch cipher {
+	case Cipher3DES:
+		return des.BlockSize
+	case CipherCAST5:
+		return 8
+	case CipherAES128, CipherAES192, CipherAES256:
+		return 16
+	}
+	return 0
+}
+
+// new returns a fresh instance of the given cipher.
+func (cipher CipherFunction) new(key []byte) (block cipher.Block) {
+	switch cipher {
+	case Cipher3DES:
+		block, _ = des.NewTripleDESCipher(key)
+	case CipherCAST5:
+		block, _ = cast5.NewCipher(key)
+	case CipherAES128, CipherAES192, CipherAES256:
+		block, _ = aes.NewCipher(key)
+	}
+	return
+}
+
+// readMPI reads a big integer from r. The bit length returned is the bit
+// length that was specified in r. This is preserved so that the integer can be
+// reserialized exactly.
+func readMPI(r io.Reader) (mpi []byte, bitLength uint16, err error) {
+	var buf [2]byte
+	_, err = readFull(r, buf[0:])
+	if err != nil {
+		return
+	}
+	bitLength = uint16(buf[0])<<8 | uint16(buf[1])
+	numBytes := (int(bitLength) + 7) / 8
+	mpi = make([]byte, numBytes)
+	_, err = readFull(r, mpi)
+	return
+}
+
+// mpiLength returns the length of the given *big.Int when serialized as an
+// MPI.
+func mpiLength(n *big.Int) (mpiLengthInBytes int) {
+	mpiLengthInBytes = 2 /* MPI length */
+	mpiLengthInBytes += (n.BitLen() + 7) / 8
+	return
+}
+
+// writeMPI serializes a big integer to w.
+func writeMPI(w io.Writer, bitLength uint16, mpiBytes []byte) (err error) {
+	_, err = w.Write([]byte{byte(bitLength >> 8), byte(bitLength)})
+	if err == nil {
+		_, err = w.Write(mpiBytes)
+	}
+	return
+}
+
+// writeBig serializes a *big.Int to w.
+func writeBig(w io.Writer, i *big.Int) error {
+	return writeMPI(w, uint16(i.BitLen()), i.Bytes())
+}
+
+// CompressionAlgo Represents the different compression algorithms
+// supported by OpenPGP (except for BZIP2, which is not currently
+// supported). See Section 9.3 of RFC 4880.
+type CompressionAlgo uint8
+
+const (
+	CompressionNone CompressionAlgo = 0
+	CompressionZIP  CompressionAlgo = 1
+	CompressionZLIB CompressionAlgo = 2
+)

vendor/golang.org/x/crypto/openpgp/packet/private_key.go

@@ -0,0 +1,380 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/cipher"
+	"crypto/dsa"
+	"crypto/ecdsa"
+	"crypto/rsa"
+	"crypto/sha1"
+	"io"
+	"io/ioutil"
+	"math/big"
+	"strconv"
+	"time"
+
+	"golang.org/x/crypto/openpgp/elgamal"
+	"golang.org/x/crypto/openpgp/errors"
+	"golang.org/x/crypto/openpgp/s2k"
+)
+
+// PrivateKey represents a possibly encrypted private key. See RFC 4880,
+// section 5.5.3.
+type PrivateKey struct {
+	PublicKey
+	Encrypted     bool // if true then the private key is unavailable until Decrypt has been called.
+	encryptedData []byte
+	cipher        CipherFunction
+	s2k           func(out, in []byte)
+	PrivateKey    interface{} // An *{rsa|dsa|ecdsa}.PrivateKey or a crypto.Signer.
+	sha1Checksum  bool
+	iv            []byte
+}
+
+func NewRSAPrivateKey(currentTime time.Time, priv *rsa.PrivateKey) *PrivateKey {
+	pk := new(PrivateKey)
+	pk.PublicKey = *NewRSAPublicKey(currentTime, &priv.PublicKey)
+	pk.PrivateKey = priv
+	return pk
+}
+
+func NewDSAPrivateKey(currentTime time.Time, priv *dsa.PrivateKey) *PrivateKey {
+	pk := new(PrivateKey)
+	pk.PublicKey = *NewDSAPublicKey(currentTime, &priv.PublicKey)
+	pk.PrivateKey = priv
+	return pk
+}
+
+func NewElGamalPrivateKey(currentTime time.Time, priv *elgamal.PrivateKey) *PrivateKey {
+	pk := new(PrivateKey)
+	pk.PublicKey = *NewElGamalPublicKey(currentTime, &priv.PublicKey)
+	pk.PrivateKey = priv
+	return pk
+}
+
+func NewECDSAPrivateKey(currentTime time.Time, priv *ecdsa.PrivateKey) *PrivateKey {
+	pk := new(PrivateKey)
+	pk.PublicKey = *NewECDSAPublicKey(currentTime, &priv.PublicKey)
+	pk.PrivateKey = priv
+	return pk
+}
+
+// NewSignerPrivateKey creates a sign-only PrivateKey from a crypto.Signer that
+// implements RSA or ECDSA.
+func NewSignerPrivateKey(currentTime time.Time, signer crypto.Signer) *PrivateKey {
+	pk := new(PrivateKey)
+	switch pubkey := signer.Public().(type) {
+	case rsa.PublicKey:
+		pk.PublicKey = *NewRSAPublicKey(currentTime, &pubkey)
+		pk.PubKeyAlgo = PubKeyAlgoRSASignOnly
+	case ecdsa.PublicKey:
+		pk.PublicKey = *NewECDSAPublicKey(currentTime, &pubkey)
+	default:
+		panic("openpgp: unknown crypto.Signer type in NewSignerPrivateKey")
+	}
+	pk.PrivateKey = signer
+	return pk
+}
+
+func (pk *PrivateKey) parse(r io.Reader) (err error) {
+	err = (&pk.PublicKey).parse(r)
+	if err != nil {
+		return
+	}
+	var buf [1]byte
+	_, err = readFull(r, buf[:])
+	if err != nil {
+		return
+	}
+
+	s2kType := buf[0]
+
+	switch s2kType {
+	case 0:
+		pk.s2k = nil
+		pk.Encrypted = false
+	case 254, 255:
+		_, err = readFull(r, buf[:])
+		if err != nil {
+			return
+		}
+		pk.cipher = CipherFunction(buf[0])
+		pk.Encrypted = true
+		pk.s2k, err = s2k.Parse(r)
+		if err != nil {
+			return
+		}
+		if s2kType == 254 {
+			pk.sha1Checksum = true
+		}
+	default:
+		return errors.UnsupportedError("deprecated s2k function in private key")
+	}
+
+	if pk.Encrypted {
+		blockSize := pk.cipher.blockSize()
+		if blockSize == 0 {
+			return errors.UnsupportedError("unsupported cipher in private key: " + strconv.Itoa(int(pk.cipher)))
+		}
+		pk.iv = make([]byte, blockSize)
+		_, err = readFull(r, pk.iv)
+		if err != nil {
+			return
+		}
+	}
+
+	pk.encryptedData, err = ioutil.ReadAll(r)
+	if err != nil {
+		return
+	}
+
+	if !pk.Encrypted {
+		return pk.parsePrivateKey(pk.encryptedData)
+	}
+
+	return
+}
+
+func mod64kHash(d []byte) uint16 {
+	var h uint16
+	for _, b := range d {
+		h += uint16(b)
+	}
+	return h
+}
+
+func (pk *PrivateKey) Serialize(w io.Writer) (err error) {
+	// TODO(agl): support encrypted private keys
+	buf := bytes.NewBuffer(nil)
+	err = pk.PublicKey.serializeWithoutHeaders(buf)
+	if err != nil {
+		return
+	}
+	buf.WriteByte(0 /* no encryption */)
+
+	privateKeyBuf := bytes.NewBuffer(nil)
+
+	switch priv := pk.PrivateKey.(type) {
+	case *rsa.PrivateKey:
+		err = serializeRSAPrivateKey(privateKeyBuf, priv)
+	case *dsa.PrivateKey:
+		err = serializeDSAPrivateKey(privateKeyBuf, priv)
+	case *elgamal.PrivateKey:
+		err = serializeElGamalPrivateKey(privateKeyBuf, priv)
+	case *ecdsa.PrivateKey:
+		err = serializeECDSAPrivateKey(privateKeyBuf, priv)
+	default:
+		err = errors.InvalidArgumentError("unknown private key type")
+	}
+	if err != nil {
+		return
+	}
+
+	ptype := packetTypePrivateKey
+	contents := buf.Bytes()
+	privateKeyBytes := privateKeyBuf.Bytes()
+	if pk.IsSubkey {
+		ptype = packetTypePrivateSubkey
+	}
+	err = serializeHeader(w, ptype, len(contents)+len(privateKeyBytes)+2)
+	if err != nil {
+		return
+	}
+	_, err = w.Write(contents)
+	if err != nil {
+		return
+	}
+	_, err = w.Write(privateKeyBytes)
+	if err != nil {
+		return
+	}
+
+	checksum := mod64kHash(privateKeyBytes)
+	var checksumBytes [2]byte
+	checksumBytes[0] = byte(checksum >> 8)
+	checksumBytes[1] = byte(checksum)
+	_, err = w.Write(checksumBytes[:])
+
+	return
+}
+
+func serializeRSAPrivateKey(w io.Writer, priv *rsa.PrivateKey) error {
+	err := writeBig(w, priv.D)
+	if err != nil {
+		return err
+	}
+	err = writeBig(w, priv.Primes[1])
+	if err != nil {
+		return err
+	}
+	err = writeBig(w, priv.Primes[0])
+	if err != nil {
+		return err
+	}
+	return writeBig(w, priv.Precomputed.Qinv)
+}
+
+func serializeDSAPrivateKey(w io.Writer, priv *dsa.PrivateKey) error {
+	return writeBig(w, priv.X)
+}
+
+func serializeElGamalPrivateKey(w io.Writer, priv *elgamal.PrivateKey) error {
+	return writeBig(w, priv.X)
+}
+
+func serializeECDSAPrivateKey(w io.Writer, priv *ecdsa.PrivateKey) error {
+	return writeBig(w, priv.D)
+}
+
+// Decrypt decrypts an encrypted private key using a passphrase.
+func (pk *PrivateKey) Decrypt(passphrase []byte) error {
+	if !pk.Encrypted {
+		return nil
+	}
+
+	key := make([]byte, pk.cipher.KeySize())
+	pk.s2k(key, passphrase)
+	block := pk.cipher.new(key)
+	cfb := cipher.NewCFBDecrypter(block, pk.iv)
+
+	data := make([]byte, len(pk.encryptedData))
+	cfb.XORKeyStream(data, pk.encryptedData)
+
+	if pk.sha1Checksum {
+		if len(data) < sha1.Size {
+			return errors.StructuralError("truncated private key data")
+		}
+		h := sha1.New()
+		h.Write(data[:len(data)-sha1.Size])
+		sum := h.Sum(nil)
+		if !bytes.Equal(sum, data[len(data)-sha1.Size:]) {
+			return errors.StructuralError("private key checksum failure")
+		}
+		data = data[:len(data)-sha1.Size]
+	} else {
+		if len(data) < 2 {
+			return errors.StructuralError("truncated private key data")
+		}
+		var sum uint16
+		for i := 0; i < len(data)-2; i++ {
+			sum += uint16(data[i])
+		}
+		if data[len(data)-2] != uint8(sum>>8) ||
+			data[len(data)-1] != uint8(sum) {
+			return errors.StructuralError("private key checksum failure")
+		}
+		data = data[:len(data)-2]
+	}
+
+	return pk.parsePrivateKey(data)
+}
+
+func (pk *PrivateKey) parsePrivateKey(data []byte) (err error) {
+	switch pk.PublicKey.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoRSAEncryptOnly:
+		return pk.parseRSAPrivateKey(data)
+	case PubKeyAlgoDSA:
+		return pk.parseDSAPrivateKey(data)
+	case PubKeyAlgoElGamal:
+		return pk.parseElGamalPrivateKey(data)
+	case PubKeyAlgoECDSA:
+		return pk.parseECDSAPrivateKey(data)
+	}
+	panic("impossible")
+}
+
+func (pk *PrivateKey) parseRSAPrivateKey(data []byte) (err error) {
+	rsaPub := pk.PublicKey.PublicKey.(*rsa.PublicKey)
+	rsaPriv := new(rsa.PrivateKey)
+	rsaPriv.PublicKey = *rsaPub
+
+	buf := bytes.NewBuffer(data)
+	d, _, err := readMPI(buf)
+	if err != nil {
+		return
+	}
+	p, _, err := readMPI(buf)
+	if err != nil {
+		return
+	}
+	q, _, err := readMPI(buf)
+	if err != nil {
+		return
+	}
+
+	rsaPriv.D = new(big.Int).SetBytes(d)
+	rsaPriv.Primes = make([]*big.Int, 2)
+	rsaPriv.Primes[0] = new(big.Int).SetBytes(p)
+	rsaPriv.Primes[1] = new(big.Int).SetBytes(q)
+	if err := rsaPriv.Validate(); err != nil {
+		return err
+	}
+	rsaPriv.Precompute()
+	pk.PrivateKey = rsaPriv
+	pk.Encrypted = false
+	pk.encryptedData = nil
+
+	return nil
+}
+
+func (pk *PrivateKey) parseDSAPrivateKey(data []byte) (err error) {
+	dsaPub := pk.PublicKey.PublicKey.(*dsa.PublicKey)
+	dsaPriv := new(dsa.PrivateKey)
+	dsaPriv.PublicKey = *dsaPub
+
+	buf := bytes.NewBuffer(data)
+	x, _, err := readMPI(buf)
+	if err != nil {
+		return
+	}
+
+	dsaPriv.X = new(big.Int).SetBytes(x)
+	pk.PrivateKey = dsaPriv
+	pk.Encrypted = false
+	pk.encryptedData = nil
+
+	return nil
+}
+
+func (pk *PrivateKey) parseElGamalPrivateKey(data []byte) (err error) {
+	pub := pk.PublicKey.PublicKey.(*elgamal.PublicKey)
+	priv := new(elgamal.PrivateKey)
+	priv.PublicKey = *pub
+
+	buf := bytes.NewBuffer(data)
+	x, _, err := readMPI(buf)
+	if err != nil {
+		return
+	}
+
+	priv.X = new(big.Int).SetBytes(x)
+	pk.PrivateKey = priv
+	pk.Encrypted = false
+	pk.encryptedData = nil
+
+	return nil
+}
+
+func (pk *PrivateKey) parseECDSAPrivateKey(data []byte) (err error) {
+	ecdsaPub := pk.PublicKey.PublicKey.(*ecdsa.PublicKey)
+
+	buf := bytes.NewBuffer(data)
+	d, _, err := readMPI(buf)
+	if err != nil {
+		return
+	}
+
+	pk.PrivateKey = &ecdsa.PrivateKey{
+		PublicKey: *ecdsaPub,
+		D:         new(big.Int).SetBytes(d),
+	}
+	pk.Encrypted = false
+	pk.encryptedData = nil
+
+	return nil
+}

vendor/golang.org/x/crypto/openpgp/packet/public_key.go

@@ -0,0 +1,748 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/dsa"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rsa"
+	"crypto/sha1"
+	_ "crypto/sha256"
+	_ "crypto/sha512"
+	"encoding/binary"
+	"fmt"
+	"hash"
+	"io"
+	"math/big"
+	"strconv"
+	"time"
+
+	"golang.org/x/crypto/openpgp/elgamal"
+	"golang.org/x/crypto/openpgp/errors"
+)
+
+var (
+	// NIST curve P-256
+	oidCurveP256 []byte = []byte{0x2A, 0x86, 0x48, 0xCE, 0x3D, 0x03, 0x01, 0x07}
+	// NIST curve P-384
+	oidCurveP384 []byte = []byte{0x2B, 0x81, 0x04, 0x00, 0x22}
+	// NIST curve P-521
+	oidCurveP521 []byte = []byte{0x2B, 0x81, 0x04, 0x00, 0x23}
+)
+
+const maxOIDLength = 8
+
+// ecdsaKey stores the algorithm-specific fields for ECDSA keys.
+// as defined in RFC 6637, Section 9.
+type ecdsaKey struct {
+	// oid contains the OID byte sequence identifying the elliptic curve used
+	oid []byte
+	// p contains the elliptic curve point that represents the public key
+	p parsedMPI
+}
+
+// parseOID reads the OID for the curve as defined in RFC 6637, Section 9.
+func parseOID(r io.Reader) (oid []byte, err error) {
+	buf := make([]byte, maxOIDLength)
+	if _, err = readFull(r, buf[:1]); err != nil {
+		return
+	}
+	oidLen := buf[0]
+	if int(oidLen) > len(buf) {
+		err = errors.UnsupportedError("invalid oid length: " + strconv.Itoa(int(oidLen)))
+		return
+	}
+	oid = buf[:oidLen]
+	_, err = readFull(r, oid)
+	return
+}
+
+func (f *ecdsaKey) parse(r io.Reader) (err error) {
+	if f.oid, err = parseOID(r); err != nil {
+		return err
+	}
+	f.p.bytes, f.p.bitLength, err = readMPI(r)
+	return
+}
+
+func (f *ecdsaKey) serialize(w io.Writer) (err error) {
+	buf := make([]byte, maxOIDLength+1)
+	buf[0] = byte(len(f.oid))
+	copy(buf[1:], f.oid)
+	if _, err = w.Write(buf[:len(f.oid)+1]); err != nil {
+		return
+	}
+	return writeMPIs(w, f.p)
+}
+
+func (f *ecdsaKey) newECDSA() (*ecdsa.PublicKey, error) {
+	var c elliptic.Curve
+	if bytes.Equal(f.oid, oidCurveP256) {
+		c = elliptic.P256()
+	} else if bytes.Equal(f.oid, oidCurveP384) {
+		c = elliptic.P384()
+	} else if bytes.Equal(f.oid, oidCurveP521) {
+		c = elliptic.P521()
+	} else {
+		return nil, errors.UnsupportedError(fmt.Sprintf("unsupported oid: %x", f.oid))
+	}
+	x, y := elliptic.Unmarshal(c, f.p.bytes)
+	if x == nil {
+		return nil, errors.UnsupportedError("failed to parse EC point")
+	}
+	return &ecdsa.PublicKey{Curve: c, X: x, Y: y}, nil
+}
+
+func (f *ecdsaKey) byteLen() int {
+	return 1 + len(f.oid) + 2 + len(f.p.bytes)
+}
+
+type kdfHashFunction byte
+type kdfAlgorithm byte
+
+// ecdhKdf stores key derivation function parameters
+// used for ECDH encryption. See RFC 6637, Section 9.
+type ecdhKdf struct {
+	KdfHash kdfHashFunction
+	KdfAlgo kdfAlgorithm
+}
+
+func (f *ecdhKdf) parse(r io.Reader) (err error) {
+	buf := make([]byte, 1)
+	if _, err = readFull(r, buf); err != nil {
+		return
+	}
+	kdfLen := int(buf[0])
+	if kdfLen < 3 {
+		return errors.UnsupportedError("Unsupported ECDH KDF length: " + strconv.Itoa(kdfLen))
+	}
+	buf = make([]byte, kdfLen)
+	if _, err = readFull(r, buf); err != nil {
+		return
+	}
+	reserved := int(buf[0])
+	f.KdfHash = kdfHashFunction(buf[1])
+	f.KdfAlgo = kdfAlgorithm(buf[2])
+	if reserved != 0x01 {
+		return errors.UnsupportedError("Unsupported KDF reserved field: " + strconv.Itoa(reserved))
+	}
+	return
+}
+
+func (f *ecdhKdf) serialize(w io.Writer) (err error) {
+	buf := make([]byte, 4)
+	// See RFC 6637, Section 9, Algorithm-Specific Fields for ECDH keys.
+	buf[0] = byte(0x03) // Length of the following fields
+	buf[1] = byte(0x01) // Reserved for future extensions, must be 1 for now
+	buf[2] = byte(f.KdfHash)
+	buf[3] = byte(f.KdfAlgo)
+	_, err = w.Write(buf[:])
+	return
+}
+
+func (f *ecdhKdf) byteLen() int {
+	return 4
+}
+
+// PublicKey represents an OpenPGP public key. See RFC 4880, section 5.5.2.
+type PublicKey struct {
+	CreationTime time.Time
+	PubKeyAlgo   PublicKeyAlgorithm
+	PublicKey    interface{} // *rsa.PublicKey, *dsa.PublicKey or *ecdsa.PublicKey
+	Fingerprint  [20]byte
+	KeyId        uint64
+	IsSubkey     bool
+
+	n, e, p, q, g, y parsedMPI
+
+	// RFC 6637 fields
+	ec   *ecdsaKey
+	ecdh *ecdhKdf
+}
+
+// signingKey provides a convenient abstraction over signature verification
+// for v3 and v4 public keys.
+type signingKey interface {
+	SerializeSignaturePrefix(io.Writer)
+	serializeWithoutHeaders(io.Writer) error
+}
+
+func fromBig(n *big.Int) parsedMPI {
+	return parsedMPI{
+		bytes:     n.Bytes(),
+		bitLength: uint16(n.BitLen()),
+	}
+}
+
+// NewRSAPublicKey returns a PublicKey that wraps the given rsa.PublicKey.
+func NewRSAPublicKey(creationTime time.Time, pub *rsa.PublicKey) *PublicKey {
+	pk := &PublicKey{
+		CreationTime: creationTime,
+		PubKeyAlgo:   PubKeyAlgoRSA,
+		PublicKey:    pub,
+		n:            fromBig(pub.N),
+		e:            fromBig(big.NewInt(int64(pub.E))),
+	}
+
+	pk.setFingerPrintAndKeyId()
+	return pk
+}
+
+// NewDSAPublicKey returns a PublicKey that wraps the given dsa.PublicKey.
+func NewDSAPublicKey(creationTime time.Time, pub *dsa.PublicKey) *PublicKey {
+	pk := &PublicKey{
+		CreationTime: creationTime,
+		PubKeyAlgo:   PubKeyAlgoDSA,
+		PublicKey:    pub,
+		p:            fromBig(pub.P),
+		q:            fromBig(pub.Q),
+		g:            fromBig(pub.G),
+		y:            fromBig(pub.Y),
+	}
+
+	pk.setFingerPrintAndKeyId()
+	return pk
+}
+
+// NewElGamalPublicKey returns a PublicKey that wraps the given elgamal.PublicKey.
+func NewElGamalPublicKey(creationTime time.Time, pub *elgamal.PublicKey) *PublicKey {
+	pk := &PublicKey{
+		CreationTime: creationTime,
+		PubKeyAlgo:   PubKeyAlgoElGamal,
+		PublicKey:    pub,
+		p:            fromBig(pub.P),
+		g:            fromBig(pub.G),
+		y:            fromBig(pub.Y),
+	}
+
+	pk.setFingerPrintAndKeyId()
+	return pk
+}
+
+func NewECDSAPublicKey(creationTime time.Time, pub *ecdsa.PublicKey) *PublicKey {
+	pk := &PublicKey{
+		CreationTime: creationTime,
+		PubKeyAlgo:   PubKeyAlgoECDSA,
+		PublicKey:    pub,
+		ec:           new(ecdsaKey),
+	}
+
+	switch pub.Curve {
+	case elliptic.P256():
+		pk.ec.oid = oidCurveP256
+	case elliptic.P384():
+		pk.ec.oid = oidCurveP384
+	case elliptic.P521():
+		pk.ec.oid = oidCurveP521
+	default:
+		panic("unknown elliptic curve")
+	}
+
+	pk.ec.p.bytes = elliptic.Marshal(pub.Curve, pub.X, pub.Y)
+	pk.ec.p.bitLength = uint16(8 * len(pk.ec.p.bytes))
+
+	pk.setFingerPrintAndKeyId()
+	return pk
+}
+
+func (pk *PublicKey) parse(r io.Reader) (err error) {
+	// RFC 4880, section 5.5.2
+	var buf [6]byte
+	_, err = readFull(r, buf[:])
+	if err != nil {
+		return
+	}
+	if buf[0] != 4 {
+		return errors.UnsupportedError("public key version")
+	}
+	pk.CreationTime = time.Unix(int64(uint32(buf[1])<<24|uint32(buf[2])<<16|uint32(buf[3])<<8|uint32(buf[4])), 0)
+	pk.PubKeyAlgo = PublicKeyAlgorithm(buf[5])
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		err = pk.parseRSA(r)
+	case PubKeyAlgoDSA:
+		err = pk.parseDSA(r)
+	case PubKeyAlgoElGamal:
+		err = pk.parseElGamal(r)
+	case PubKeyAlgoECDSA:
+		pk.ec = new(ecdsaKey)
+		if err = pk.ec.parse(r); err != nil {
+			return err
+		}
+		pk.PublicKey, err = pk.ec.newECDSA()
+	case PubKeyAlgoECDH:
+		pk.ec = new(ecdsaKey)
+		if err = pk.ec.parse(r); err != nil {
+			return
+		}
+		pk.ecdh = new(ecdhKdf)
+		if err = pk.ecdh.parse(r); err != nil {
+			return
+		}
+		// The ECDH key is stored in an ecdsa.PublicKey for convenience.
+		pk.PublicKey, err = pk.ec.newECDSA()
+	default:
+		err = errors.UnsupportedError("public key type: " + strconv.Itoa(int(pk.PubKeyAlgo)))
+	}
+	if err != nil {
+		return
+	}
+
+	pk.setFingerPrintAndKeyId()
+	return
+}
+
+func (pk *PublicKey) setFingerPrintAndKeyId() {
+	// RFC 4880, section 12.2
+	fingerPrint := sha1.New()
+	pk.SerializeSignaturePrefix(fingerPrint)
+	pk.serializeWithoutHeaders(fingerPrint)
+	copy(pk.Fingerprint[:], fingerPrint.Sum(nil))
+	pk.KeyId = binary.BigEndian.Uint64(pk.Fingerprint[12:20])
+}
+
+// parseRSA parses RSA public key material from the given Reader. See RFC 4880,
+// section 5.5.2.
+func (pk *PublicKey) parseRSA(r io.Reader) (err error) {
+	pk.n.bytes, pk.n.bitLength, err = readMPI(r)
+	if err != nil {
+		return
+	}
+	pk.e.bytes, pk.e.bitLength, err = readMPI(r)
+	if err != nil {
+		return
+	}
+
+	if len(pk.e.bytes) > 3 {
+		err = errors.UnsupportedError("large public exponent")
+		return
+	}
+	rsa := &rsa.PublicKey{
+		N: new(big.Int).SetBytes(pk.n.bytes),
+		E: 0,
+	}
+	for i := 0; i < len(pk.e.bytes); i++ {
+		rsa.E <<= 8
+		rsa.E |= int(pk.e.bytes[i])
+	}
+	pk.PublicKey = rsa
+	return
+}
+
+// parseDSA parses DSA public key material from the given Reader. See RFC 4880,
+// section 5.5.2.
+func (pk *PublicKey) parseDSA(r io.Reader) (err error) {
+	pk.p.bytes, pk.p.bitLength, err = readMPI(r)
+	if err != nil {
+		return
+	}
+	pk.q.bytes, pk.q.bitLength, err = readMPI(r)
+	if err != nil {
+		return
+	}
+	pk.g.bytes, pk.g.bitLength, err = readMPI(r)
+	if err != nil {
+		return
+	}
+	pk.y.bytes, pk.y.bitLength, err = readMPI(r)
+	if err != nil {
+		return
+	}
+
+	dsa := new(dsa.PublicKey)
+	dsa.P = new(big.Int).SetBytes(pk.p.bytes)
+	dsa.Q = new(big.Int).SetBytes(pk.q.bytes)
+	dsa.G = new(big.Int).SetBytes(pk.g.bytes)
+	dsa.Y = new(big.Int).SetBytes(pk.y.bytes)
+	pk.PublicKey = dsa
+	return
+}
+
+// parseElGamal parses ElGamal public key material from the given Reader. See
+// RFC 4880, section 5.5.2.
+func (pk *PublicKey) parseElGamal(r io.Reader) (err error) {
+	pk.p.bytes, pk.p.bitLength, err = readMPI(r)
+	if err != nil {
+		return
+	}
+	pk.g.bytes, pk.g.bitLength, err = readMPI(r)
+	if err != nil {
+		return
+	}
+	pk.y.bytes, pk.y.bitLength, err = readMPI(r)
+	if err != nil {
+		return
+	}
+
+	elgamal := new(elgamal.PublicKey)
+	elgamal.P = new(big.Int).SetBytes(pk.p.bytes)
+	elgamal.G = new(big.Int).SetBytes(pk.g.bytes)
+	elgamal.Y = new(big.Int).SetBytes(pk.y.bytes)
+	pk.PublicKey = elgamal
+	return
+}
+
+// SerializeSignaturePrefix writes the prefix for this public key to the given Writer.
+// The prefix is used when calculating a signature over this public key. See
+// RFC 4880, section 5.2.4.
+func (pk *PublicKey) SerializeSignaturePrefix(h io.Writer) {
+	var pLength uint16
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		pLength += 2 + uint16(len(pk.n.bytes))
+		pLength += 2 + uint16(len(pk.e.bytes))
+	case PubKeyAlgoDSA:
+		pLength += 2 + uint16(len(pk.p.bytes))
+		pLength += 2 + uint16(len(pk.q.bytes))
+		pLength += 2 + uint16(len(pk.g.bytes))
+		pLength += 2 + uint16(len(pk.y.bytes))
+	case PubKeyAlgoElGamal:
+		pLength += 2 + uint16(len(pk.p.bytes))
+		pLength += 2 + uint16(len(pk.g.bytes))
+		pLength += 2 + uint16(len(pk.y.bytes))
+	case PubKeyAlgoECDSA:
+		pLength += uint16(pk.ec.byteLen())
+	case PubKeyAlgoECDH:
+		pLength += uint16(pk.ec.byteLen())
+		pLength += uint16(pk.ecdh.byteLen())
+	default:
+		panic("unknown public key algorithm")
+	}
+	pLength += 6
+	h.Write([]byte{0x99, byte(pLength >> 8), byte(pLength)})
+	return
+}
+
+func (pk *PublicKey) Serialize(w io.Writer) (err error) {
+	length := 6 // 6 byte header
+
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		length += 2 + len(pk.n.bytes)
+		length += 2 + len(pk.e.bytes)
+	case PubKeyAlgoDSA:
+		length += 2 + len(pk.p.bytes)
+		length += 2 + len(pk.q.bytes)
+		length += 2 + len(pk.g.bytes)
+		length += 2 + len(pk.y.bytes)
+	case PubKeyAlgoElGamal:
+		length += 2 + len(pk.p.bytes)
+		length += 2 + len(pk.g.bytes)
+		length += 2 + len(pk.y.bytes)
+	case PubKeyAlgoECDSA:
+		length += pk.ec.byteLen()
+	case PubKeyAlgoECDH:
+		length += pk.ec.byteLen()
+		length += pk.ecdh.byteLen()
+	default:
+		panic("unknown public key algorithm")
+	}
+
+	packetType := packetTypePublicKey
+	if pk.IsSubkey {
+		packetType = packetTypePublicSubkey
+	}
+	err = serializeHeader(w, packetType, length)
+	if err != nil {
+		return
+	}
+	return pk.serializeWithoutHeaders(w)
+}
+
+// serializeWithoutHeaders marshals the PublicKey to w in the form of an
+// OpenPGP public key packet, not including the packet header.
+func (pk *PublicKey) serializeWithoutHeaders(w io.Writer) (err error) {
+	var buf [6]byte
+	buf[0] = 4
+	t := uint32(pk.CreationTime.Unix())
+	buf[1] = byte(t >> 24)
+	buf[2] = byte(t >> 16)
+	buf[3] = byte(t >> 8)
+	buf[4] = byte(t)
+	buf[5] = byte(pk.PubKeyAlgo)
+
+	_, err = w.Write(buf[:])
+	if err != nil {
+		return
+	}
+
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		return writeMPIs(w, pk.n, pk.e)
+	case PubKeyAlgoDSA:
+		return writeMPIs(w, pk.p, pk.q, pk.g, pk.y)
+	case PubKeyAlgoElGamal:
+		return writeMPIs(w, pk.p, pk.g, pk.y)
+	case PubKeyAlgoECDSA:
+		return pk.ec.serialize(w)
+	case PubKeyAlgoECDH:
+		if err = pk.ec.serialize(w); err != nil {
+			return
+		}
+		return pk.ecdh.serialize(w)
+	}
+	return errors.InvalidArgumentError("bad public-key algorithm")
+}
+
+// CanSign returns true iff this public key can generate signatures
+func (pk *PublicKey) CanSign() bool {
+	return pk.PubKeyAlgo != PubKeyAlgoRSAEncryptOnly && pk.PubKeyAlgo != PubKeyAlgoElGamal
+}
+
+// VerifySignature returns nil iff sig is a valid signature, made by this
+// public key, of the data hashed into signed. signed is mutated by this call.
+func (pk *PublicKey) VerifySignature(signed hash.Hash, sig *Signature) (err error) {
+	if !pk.CanSign() {
+		return errors.InvalidArgumentError("public key cannot generate signatures")
+	}
+
+	signed.Write(sig.HashSuffix)
+	hashBytes := signed.Sum(nil)
+
+	if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
+		return errors.SignatureError("hash tag doesn't match")
+	}
+
+	if pk.PubKeyAlgo != sig.PubKeyAlgo {
+		return errors.InvalidArgumentError("public key and signature use different algorithms")
+	}
+
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+		rsaPublicKey, _ := pk.PublicKey.(*rsa.PublicKey)
+		err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes)
+		if err != nil {
+			return errors.SignatureError("RSA verification failure")
+		}
+		return nil
+	case PubKeyAlgoDSA:
+		dsaPublicKey, _ := pk.PublicKey.(*dsa.PublicKey)
+		// Need to truncate hashBytes to match FIPS 186-3 section 4.6.
+		subgroupSize := (dsaPublicKey.Q.BitLen() + 7) / 8
+		if len(hashBytes) > subgroupSize {
+			hashBytes = hashBytes[:subgroupSize]
+		}
+		if !dsa.Verify(dsaPublicKey, hashBytes, new(big.Int).SetBytes(sig.DSASigR.bytes), new(big.Int).SetBytes(sig.DSASigS.bytes)) {
+			return errors.SignatureError("DSA verification failure")
+		}
+		return nil
+	case PubKeyAlgoECDSA:
+		ecdsaPublicKey := pk.PublicKey.(*ecdsa.PublicKey)
+		if !ecdsa.Verify(ecdsaPublicKey, hashBytes, new(big.Int).SetBytes(sig.ECDSASigR.bytes), new(big.Int).SetBytes(sig.ECDSASigS.bytes)) {
+			return errors.SignatureError("ECDSA verification failure")
+		}
+		return nil
+	default:
+		return errors.SignatureError("Unsupported public key algorithm used in signature")
+	}
+}
+
+// VerifySignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, of the data hashed into signed. signed is mutated by this call.
+func (pk *PublicKey) VerifySignatureV3(signed hash.Hash, sig *SignatureV3) (err error) {
+	if !pk.CanSign() {
+		return errors.InvalidArgumentError("public key cannot generate signatures")
+	}
+
+	suffix := make([]byte, 5)
+	suffix[0] = byte(sig.SigType)
+	binary.BigEndian.PutUint32(suffix[1:], uint32(sig.CreationTime.Unix()))
+	signed.Write(suffix)
+	hashBytes := signed.Sum(nil)
+
+	if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
+		return errors.SignatureError("hash tag doesn't match")
+	}
+
+	if pk.PubKeyAlgo != sig.PubKeyAlgo {
+		return errors.InvalidArgumentError("public key and signature use different algorithms")
+	}
+
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+		rsaPublicKey := pk.PublicKey.(*rsa.PublicKey)
+		if err = rsa.VerifyPKCS1v15(rsaPublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes); err != nil {
+			return errors.SignatureError("RSA verification failure")
+		}
+		return
+	case PubKeyAlgoDSA:
+		dsaPublicKey := pk.PublicKey.(*dsa.PublicKey)
+		// Need to truncate hashBytes to match FIPS 186-3 section 4.6.
+		subgroupSize := (dsaPublicKey.Q.BitLen() + 7) / 8
+		if len(hashBytes) > subgroupSize {
+			hashBytes = hashBytes[:subgroupSize]
+		}
+		if !dsa.Verify(dsaPublicKey, hashBytes, new(big.Int).SetBytes(sig.DSASigR.bytes), new(big.Int).SetBytes(sig.DSASigS.bytes)) {
+			return errors.SignatureError("DSA verification failure")
+		}
+		return nil
+	default:
+		panic("shouldn't happen")
+	}
+}
+
+// keySignatureHash returns a Hash of the message that needs to be signed for
+// pk to assert a subkey relationship to signed.
+func keySignatureHash(pk, signed signingKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
+	if !hashFunc.Available() {
+		return nil, errors.UnsupportedError("hash function")
+	}
+	h = hashFunc.New()
+
+	// RFC 4880, section 5.2.4
+	pk.SerializeSignaturePrefix(h)
+	pk.serializeWithoutHeaders(h)
+	signed.SerializeSignaturePrefix(h)
+	signed.serializeWithoutHeaders(h)
+	return
+}
+
+// VerifyKeySignature returns nil iff sig is a valid signature, made by this
+// public key, of signed.
+func (pk *PublicKey) VerifyKeySignature(signed *PublicKey, sig *Signature) error {
+	h, err := keySignatureHash(pk, signed, sig.Hash)
+	if err != nil {
+		return err
+	}
+	if err = pk.VerifySignature(h, sig); err != nil {
+		return err
+	}
+
+	if sig.FlagSign {
+		// Signing subkeys must be cross-signed. See
+		// https://www.gnupg.org/faq/subkey-cross-certify.html.
+		if sig.EmbeddedSignature == nil {
+			return errors.StructuralError("signing subkey is missing cross-signature")
+		}
+		// Verify the cross-signature. This is calculated over the same
+		// data as the main signature, so we cannot just recursively
+		// call signed.VerifyKeySignature(...)
+		if h, err = keySignatureHash(pk, signed, sig.EmbeddedSignature.Hash); err != nil {
+			return errors.StructuralError("error while hashing for cross-signature: " + err.Error())
+		}
+		if err := signed.VerifySignature(h, sig.EmbeddedSignature); err != nil {
+			return errors.StructuralError("error while verifying cross-signature: " + err.Error())
+		}
+	}
+
+	return nil
+}
+
+func keyRevocationHash(pk signingKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
+	if !hashFunc.Available() {
+		return nil, errors.UnsupportedError("hash function")
+	}
+	h = hashFunc.New()
+
+	// RFC 4880, section 5.2.4
+	pk.SerializeSignaturePrefix(h)
+	pk.serializeWithoutHeaders(h)
+
+	return
+}
+
+// VerifyRevocationSignature returns nil iff sig is a valid signature, made by this
+// public key.
+func (pk *PublicKey) VerifyRevocationSignature(sig *Signature) (err error) {
+	h, err := keyRevocationHash(pk, sig.Hash)
+	if err != nil {
+		return err
+	}
+	return pk.VerifySignature(h, sig)
+}
+
+// userIdSignatureHash returns a Hash of the message that needs to be signed
+// to assert that pk is a valid key for id.
+func userIdSignatureHash(id string, pk *PublicKey, hashFunc crypto.Hash) (h hash.Hash, err error) {
+	if !hashFunc.Available() {
+		return nil, errors.UnsupportedError("hash function")
+	}
+	h = hashFunc.New()
+
+	// RFC 4880, section 5.2.4
+	pk.SerializeSignaturePrefix(h)
+	pk.serializeWithoutHeaders(h)
+
+	var buf [5]byte
+	buf[0] = 0xb4
+	buf[1] = byte(len(id) >> 24)
+	buf[2] = byte(len(id) >> 16)
+	buf[3] = byte(len(id) >> 8)
+	buf[4] = byte(len(id))
+	h.Write(buf[:])
+	h.Write([]byte(id))
+
+	return
+}
+
+// VerifyUserIdSignature returns nil iff sig is a valid signature, made by this
+// public key, that id is the identity of pub.
+func (pk *PublicKey) VerifyUserIdSignature(id string, pub *PublicKey, sig *Signature) (err error) {
+	h, err := userIdSignatureHash(id, pub, sig.Hash)
+	if err != nil {
+		return err
+	}
+	return pk.VerifySignature(h, sig)
+}
+
+// VerifyUserIdSignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, that id is the identity of pub.
+func (pk *PublicKey) VerifyUserIdSignatureV3(id string, pub *PublicKey, sig *SignatureV3) (err error) {
+	h, err := userIdSignatureV3Hash(id, pub, sig.Hash)
+	if err != nil {
+		return err
+	}
+	return pk.VerifySignatureV3(h, sig)
+}
+
+// KeyIdString returns the public key's fingerprint in capital hex
+// (e.g. "6C7EE1B8621CC013").
+func (pk *PublicKey) KeyIdString() string {
+	return fmt.Sprintf("%X", pk.Fingerprint[12:20])
+}
+
+// KeyIdShortString returns the short form of public key's fingerprint
+// in capital hex, as shown by gpg --list-keys (e.g. "621CC013").
+func (pk *PublicKey) KeyIdShortString() string {
+	return fmt.Sprintf("%X", pk.Fingerprint[16:20])
+}
+
+// A parsedMPI is used to store the contents of a big integer, along with the
+// bit length that was specified in the original input. This allows the MPI to
+// be reserialized exactly.
+type parsedMPI struct {
+	bytes     []byte
+	bitLength uint16
+}
+
+// writeMPIs is a utility function for serializing several big integers to the
+// given Writer.
+func writeMPIs(w io.Writer, mpis ...parsedMPI) (err error) {
+	for _, mpi := range mpis {
+		err = writeMPI(w, mpi.bitLength, mpi.bytes)
+		if err != nil {
+			return
+		}
+	}
+	return
+}
+
+// BitLength returns the bit length for the given public key.
+func (pk *PublicKey) BitLength() (bitLength uint16, err error) {
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		bitLength = pk.n.bitLength
+	case PubKeyAlgoDSA:
+		bitLength = pk.p.bitLength
+	case PubKeyAlgoElGamal:
+		bitLength = pk.p.bitLength
+	default:
+		err = errors.InvalidArgumentError("bad public-key algorithm")
+	}
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/public_key_v3.go

@@ -0,0 +1,279 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"crypto"
+	"crypto/md5"
+	"crypto/rsa"
+	"encoding/binary"
+	"fmt"
+	"hash"
+	"io"
+	"math/big"
+	"strconv"
+	"time"
+
+	"golang.org/x/crypto/openpgp/errors"
+)
+
+// PublicKeyV3 represents older, version 3 public keys. These keys are less secure and
+// should not be used for signing or encrypting. They are supported here only for
+// parsing version 3 key material and validating signatures.
+// See RFC 4880, section 5.5.2.
+type PublicKeyV3 struct {
+	CreationTime time.Time
+	DaysToExpire uint16
+	PubKeyAlgo   PublicKeyAlgorithm
+	PublicKey    *rsa.PublicKey
+	Fingerprint  [16]byte
+	KeyId        uint64
+	IsSubkey     bool
+
+	n, e parsedMPI
+}
+
+// newRSAPublicKeyV3 returns a PublicKey that wraps the given rsa.PublicKey.
+// Included here for testing purposes only. RFC 4880, section 5.5.2:
+// "an implementation MUST NOT generate a V3 key, but MAY accept it."
+func newRSAPublicKeyV3(creationTime time.Time, pub *rsa.PublicKey) *PublicKeyV3 {
+	pk := &PublicKeyV3{
+		CreationTime: creationTime,
+		PublicKey:    pub,
+		n:            fromBig(pub.N),
+		e:            fromBig(big.NewInt(int64(pub.E))),
+	}
+
+	pk.setFingerPrintAndKeyId()
+	return pk
+}
+
+func (pk *PublicKeyV3) parse(r io.Reader) (err error) {
+	// RFC 4880, section 5.5.2
+	var buf [8]byte
+	if _, err = readFull(r, buf[:]); err != nil {
+		return
+	}
+	if buf[0] < 2 || buf[0] > 3 {
+		return errors.UnsupportedError("public key version")
+	}
+	pk.CreationTime = time.Unix(int64(uint32(buf[1])<<24|uint32(buf[2])<<16|uint32(buf[3])<<8|uint32(buf[4])), 0)
+	pk.DaysToExpire = binary.BigEndian.Uint16(buf[5:7])
+	pk.PubKeyAlgo = PublicKeyAlgorithm(buf[7])
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		err = pk.parseRSA(r)
+	default:
+		err = errors.UnsupportedError("public key type: " + strconv.Itoa(int(pk.PubKeyAlgo)))
+	}
+	if err != nil {
+		return
+	}
+
+	pk.setFingerPrintAndKeyId()
+	return
+}
+
+func (pk *PublicKeyV3) setFingerPrintAndKeyId() {
+	// RFC 4880, section 12.2
+	fingerPrint := md5.New()
+	fingerPrint.Write(pk.n.bytes)
+	fingerPrint.Write(pk.e.bytes)
+	fingerPrint.Sum(pk.Fingerprint[:0])
+	pk.KeyId = binary.BigEndian.Uint64(pk.n.bytes[len(pk.n.bytes)-8:])
+}
+
+// parseRSA parses RSA public key material from the given Reader. See RFC 4880,
+// section 5.5.2.
+func (pk *PublicKeyV3) parseRSA(r io.Reader) (err error) {
+	if pk.n.bytes, pk.n.bitLength, err = readMPI(r); err != nil {
+		return
+	}
+	if pk.e.bytes, pk.e.bitLength, err = readMPI(r); err != nil {
+		return
+	}
+
+	// RFC 4880 Section 12.2 requires the low 8 bytes of the
+	// modulus to form the key id.
+	if len(pk.n.bytes) < 8 {
+		return errors.StructuralError("v3 public key modulus is too short")
+	}
+	if len(pk.e.bytes) > 3 {
+		err = errors.UnsupportedError("large public exponent")
+		return
+	}
+	rsa := &rsa.PublicKey{N: new(big.Int).SetBytes(pk.n.bytes)}
+	for i := 0; i < len(pk.e.bytes); i++ {
+		rsa.E <<= 8
+		rsa.E |= int(pk.e.bytes[i])
+	}
+	pk.PublicKey = rsa
+	return
+}
+
+// SerializeSignaturePrefix writes the prefix for this public key to the given Writer.
+// The prefix is used when calculating a signature over this public key. See
+// RFC 4880, section 5.2.4.
+func (pk *PublicKeyV3) SerializeSignaturePrefix(w io.Writer) {
+	var pLength uint16
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		pLength += 2 + uint16(len(pk.n.bytes))
+		pLength += 2 + uint16(len(pk.e.bytes))
+	default:
+		panic("unknown public key algorithm")
+	}
+	pLength += 6
+	w.Write([]byte{0x99, byte(pLength >> 8), byte(pLength)})
+	return
+}
+
+func (pk *PublicKeyV3) Serialize(w io.Writer) (err error) {
+	length := 8 // 8 byte header
+
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		length += 2 + len(pk.n.bytes)
+		length += 2 + len(pk.e.bytes)
+	default:
+		panic("unknown public key algorithm")
+	}
+
+	packetType := packetTypePublicKey
+	if pk.IsSubkey {
+		packetType = packetTypePublicSubkey
+	}
+	if err = serializeHeader(w, packetType, length); err != nil {
+		return
+	}
+	return pk.serializeWithoutHeaders(w)
+}
+
+// serializeWithoutHeaders marshals the PublicKey to w in the form of an
+// OpenPGP public key packet, not including the packet header.
+func (pk *PublicKeyV3) serializeWithoutHeaders(w io.Writer) (err error) {
+	var buf [8]byte
+	// Version 3
+	buf[0] = 3
+	// Creation time
+	t := uint32(pk.CreationTime.Unix())
+	buf[1] = byte(t >> 24)
+	buf[2] = byte(t >> 16)
+	buf[3] = byte(t >> 8)
+	buf[4] = byte(t)
+	// Days to expire
+	buf[5] = byte(pk.DaysToExpire >> 8)
+	buf[6] = byte(pk.DaysToExpire)
+	// Public key algorithm
+	buf[7] = byte(pk.PubKeyAlgo)
+
+	if _, err = w.Write(buf[:]); err != nil {
+		return
+	}
+
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		return writeMPIs(w, pk.n, pk.e)
+	}
+	return errors.InvalidArgumentError("bad public-key algorithm")
+}
+
+// CanSign returns true iff this public key can generate signatures
+func (pk *PublicKeyV3) CanSign() bool {
+	return pk.PubKeyAlgo != PubKeyAlgoRSAEncryptOnly
+}
+
+// VerifySignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, of the data hashed into signed. signed is mutated by this call.
+func (pk *PublicKeyV3) VerifySignatureV3(signed hash.Hash, sig *SignatureV3) (err error) {
+	if !pk.CanSign() {
+		return errors.InvalidArgumentError("public key cannot generate signatures")
+	}
+
+	suffix := make([]byte, 5)
+	suffix[0] = byte(sig.SigType)
+	binary.BigEndian.PutUint32(suffix[1:], uint32(sig.CreationTime.Unix()))
+	signed.Write(suffix)
+	hashBytes := signed.Sum(nil)
+
+	if hashBytes[0] != sig.HashTag[0] || hashBytes[1] != sig.HashTag[1] {
+		return errors.SignatureError("hash tag doesn't match")
+	}
+
+	if pk.PubKeyAlgo != sig.PubKeyAlgo {
+		return errors.InvalidArgumentError("public key and signature use different algorithms")
+	}
+
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+		if err = rsa.VerifyPKCS1v15(pk.PublicKey, sig.Hash, hashBytes, sig.RSASignature.bytes); err != nil {
+			return errors.SignatureError("RSA verification failure")
+		}
+		return
+	default:
+		// V3 public keys only support RSA.
+		panic("shouldn't happen")
+	}
+}
+
+// VerifyUserIdSignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, that id is the identity of pub.
+func (pk *PublicKeyV3) VerifyUserIdSignatureV3(id string, pub *PublicKeyV3, sig *SignatureV3) (err error) {
+	h, err := userIdSignatureV3Hash(id, pk, sig.Hash)
+	if err != nil {
+		return err
+	}
+	return pk.VerifySignatureV3(h, sig)
+}
+
+// VerifyKeySignatureV3 returns nil iff sig is a valid signature, made by this
+// public key, of signed.
+func (pk *PublicKeyV3) VerifyKeySignatureV3(signed *PublicKeyV3, sig *SignatureV3) (err error) {
+	h, err := keySignatureHash(pk, signed, sig.Hash)
+	if err != nil {
+		return err
+	}
+	return pk.VerifySignatureV3(h, sig)
+}
+
+// userIdSignatureV3Hash returns a Hash of the message that needs to be signed
+// to assert that pk is a valid key for id.
+func userIdSignatureV3Hash(id string, pk signingKey, hfn crypto.Hash) (h hash.Hash, err error) {
+	if !hfn.Available() {
+		return nil, errors.UnsupportedError("hash function")
+	}
+	h = hfn.New()
+
+	// RFC 4880, section 5.2.4
+	pk.SerializeSignaturePrefix(h)
+	pk.serializeWithoutHeaders(h)
+
+	h.Write([]byte(id))
+
+	return
+}
+
+// KeyIdString returns the public key's fingerprint in capital hex
+// (e.g. "6C7EE1B8621CC013").
+func (pk *PublicKeyV3) KeyIdString() string {
+	return fmt.Sprintf("%X", pk.KeyId)
+}
+
+// KeyIdShortString returns the short form of public key's fingerprint
+// in capital hex, as shown by gpg --list-keys (e.g. "621CC013").
+func (pk *PublicKeyV3) KeyIdShortString() string {
+	return fmt.Sprintf("%X", pk.KeyId&0xFFFFFFFF)
+}
+
+// BitLength returns the bit length for the given public key.
+func (pk *PublicKeyV3) BitLength() (bitLength uint16, err error) {
+	switch pk.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSAEncryptOnly, PubKeyAlgoRSASignOnly:
+		bitLength = pk.n.bitLength
+	default:
+		err = errors.InvalidArgumentError("bad public-key algorithm")
+	}
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/reader.go

@@ -0,0 +1,76 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"golang.org/x/crypto/openpgp/errors"
+	"io"
+)
+
+// Reader reads packets from an io.Reader and allows packets to be 'unread' so
+// that they result from the next call to Next.
+type Reader struct {
+	q       []Packet
+	readers []io.Reader
+}
+
+// New io.Readers are pushed when a compressed or encrypted packet is processed
+// and recursively treated as a new source of packets. However, a carefully
+// crafted packet can trigger an infinite recursive sequence of packets. See
+// http://mumble.net/~campbell/misc/pgp-quine
+// https://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2013-4402
+// This constant limits the number of recursive packets that may be pushed.
+const maxReaders = 32
+
+// Next returns the most recently unread Packet, or reads another packet from
+// the top-most io.Reader. Unknown packet types are skipped.
+func (r *Reader) Next() (p Packet, err error) {
+	if len(r.q) > 0 {
+		p = r.q[len(r.q)-1]
+		r.q = r.q[:len(r.q)-1]
+		return
+	}
+
+	for len(r.readers) > 0 {
+		p, err = Read(r.readers[len(r.readers)-1])
+		if err == nil {
+			return
+		}
+		if err == io.EOF {
+			r.readers = r.readers[:len(r.readers)-1]
+			continue
+		}
+		if _, ok := err.(errors.UnknownPacketTypeError); !ok {
+			return nil, err
+		}
+	}
+
+	return nil, io.EOF
+}
+
+// Push causes the Reader to start reading from a new io.Reader. When an EOF
+// error is seen from the new io.Reader, it is popped and the Reader continues
+// to read from the next most recent io.Reader. Push returns a StructuralError
+// if pushing the reader would exceed the maximum recursion level, otherwise it
+// returns nil.
+func (r *Reader) Push(reader io.Reader) (err error) {
+	if len(r.readers) >= maxReaders {
+		return errors.StructuralError("too many layers of packets")
+	}
+	r.readers = append(r.readers, reader)
+	return nil
+}
+
+// Unread causes the given Packet to be returned from the next call to Next.
+func (r *Reader) Unread(p Packet) {
+	r.q = append(r.q, p)
+}
+
+func NewReader(r io.Reader) *Reader {
+	return &Reader{
+		q:       nil,
+		readers: []io.Reader{r},
+	}
+}

vendor/golang.org/x/crypto/openpgp/packet/signature.go

@@ -0,0 +1,731 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"bytes"
+	"crypto"
+	"crypto/dsa"
+	"crypto/ecdsa"
+	"encoding/asn1"
+	"encoding/binary"
+	"hash"
+	"io"
+	"math/big"
+	"strconv"
+	"time"
+
+	"golang.org/x/crypto/openpgp/errors"
+	"golang.org/x/crypto/openpgp/s2k"
+)
+
+const (
+	// See RFC 4880, section 5.2.3.21 for details.
+	KeyFlagCertify = 1 << iota
+	KeyFlagSign
+	KeyFlagEncryptCommunications
+	KeyFlagEncryptStorage
+)
+
+// Signature represents a signature. See RFC 4880, section 5.2.
+type Signature struct {
+	SigType    SignatureType
+	PubKeyAlgo PublicKeyAlgorithm
+	Hash       crypto.Hash
+
+	// HashSuffix is extra data that is hashed in after the signed data.
+	HashSuffix []byte
+	// HashTag contains the first two bytes of the hash for fast rejection
+	// of bad signed data.
+	HashTag      [2]byte
+	CreationTime time.Time
+
+	RSASignature         parsedMPI
+	DSASigR, DSASigS     parsedMPI
+	ECDSASigR, ECDSASigS parsedMPI
+
+	// rawSubpackets contains the unparsed subpackets, in order.
+	rawSubpackets []outputSubpacket
+
+	// The following are optional so are nil when not included in the
+	// signature.
+
+	SigLifetimeSecs, KeyLifetimeSecs                        *uint32
+	PreferredSymmetric, PreferredHash, PreferredCompression []uint8
+	IssuerKeyId                                             *uint64
+	IsPrimaryId                                             *bool
+
+	// FlagsValid is set if any flags were given. See RFC 4880, section
+	// 5.2.3.21 for details.
+	FlagsValid                                                           bool
+	FlagCertify, FlagSign, FlagEncryptCommunications, FlagEncryptStorage bool
+
+	// RevocationReason is set if this signature has been revoked.
+	// See RFC 4880, section 5.2.3.23 for details.
+	RevocationReason     *uint8
+	RevocationReasonText string
+
+	// MDC is set if this signature has a feature packet that indicates
+	// support for MDC subpackets.
+	MDC bool
+
+	// EmbeddedSignature, if non-nil, is a signature of the parent key, by
+	// this key. This prevents an attacker from claiming another's signing
+	// subkey as their own.
+	EmbeddedSignature *Signature
+
+	outSubpackets []outputSubpacket
+}
+
+func (sig *Signature) parse(r io.Reader) (err error) {
+	// RFC 4880, section 5.2.3
+	var buf [5]byte
+	_, err = readFull(r, buf[:1])
+	if err != nil {
+		return
+	}
+	if buf[0] != 4 {
+		err = errors.UnsupportedError("signature packet version " + strconv.Itoa(int(buf[0])))
+		return
+	}
+
+	_, err = readFull(r, buf[:5])
+	if err != nil {
+		return
+	}
+	sig.SigType = SignatureType(buf[0])
+	sig.PubKeyAlgo = PublicKeyAlgorithm(buf[1])
+	switch sig.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA, PubKeyAlgoECDSA:
+	default:
+		err = errors.UnsupportedError("public key algorithm " + strconv.Itoa(int(sig.PubKeyAlgo)))
+		return
+	}
+
+	var ok bool
+	sig.Hash, ok = s2k.HashIdToHash(buf[2])
+	if !ok {
+		return errors.UnsupportedError("hash function " + strconv.Itoa(int(buf[2])))
+	}
+
+	hashedSubpacketsLength := int(buf[3])<<8 | int(buf[4])
+	l := 6 + hashedSubpacketsLength
+	sig.HashSuffix = make([]byte, l+6)
+	sig.HashSuffix[0] = 4
+	copy(sig.HashSuffix[1:], buf[:5])
+	hashedSubpackets := sig.HashSuffix[6:l]
+	_, err = readFull(r, hashedSubpackets)
+	if err != nil {
+		return
+	}
+	// See RFC 4880, section 5.2.4
+	trailer := sig.HashSuffix[l:]
+	trailer[0] = 4
+	trailer[1] = 0xff
+	trailer[2] = uint8(l >> 24)
+	trailer[3] = uint8(l >> 16)
+	trailer[4] = uint8(l >> 8)
+	trailer[5] = uint8(l)
+
+	err = parseSignatureSubpackets(sig, hashedSubpackets, true)
+	if err != nil {
+		return
+	}
+
+	_, err = readFull(r, buf[:2])
+	if err != nil {
+		return
+	}
+	unhashedSubpacketsLength := int(buf[0])<<8 | int(buf[1])
+	unhashedSubpackets := make([]byte, unhashedSubpacketsLength)
+	_, err = readFull(r, unhashedSubpackets)
+	if err != nil {
+		return
+	}
+	err = parseSignatureSubpackets(sig, unhashedSubpackets, false)
+	if err != nil {
+		return
+	}
+
+	_, err = readFull(r, sig.HashTag[:2])
+	if err != nil {
+		return
+	}
+
+	switch sig.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+		sig.RSASignature.bytes, sig.RSASignature.bitLength, err = readMPI(r)
+	case PubKeyAlgoDSA:
+		sig.DSASigR.bytes, sig.DSASigR.bitLength, err = readMPI(r)
+		if err == nil {
+			sig.DSASigS.bytes, sig.DSASigS.bitLength, err = readMPI(r)
+		}
+	case PubKeyAlgoECDSA:
+		sig.ECDSASigR.bytes, sig.ECDSASigR.bitLength, err = readMPI(r)
+		if err == nil {
+			sig.ECDSASigS.bytes, sig.ECDSASigS.bitLength, err = readMPI(r)
+		}
+	default:
+		panic("unreachable")
+	}
+	return
+}
+
+// parseSignatureSubpackets parses subpackets of the main signature packet. See
+// RFC 4880, section 5.2.3.1.
+func parseSignatureSubpackets(sig *Signature, subpackets []byte, isHashed bool) (err error) {
+	for len(subpackets) > 0 {
+		subpackets, err = parseSignatureSubpacket(sig, subpackets, isHashed)
+		if err != nil {
+			return
+		}
+	}
+
+	if sig.CreationTime.IsZero() {
+		err = errors.StructuralError("no creation time in signature")
+	}
+
+	return
+}
+
+type signatureSubpacketType uint8
+
+const (
+	creationTimeSubpacket        signatureSubpacketType = 2
+	signatureExpirationSubpacket signatureSubpacketType = 3
+	keyExpirationSubpacket       signatureSubpacketType = 9
+	prefSymmetricAlgosSubpacket  signatureSubpacketType = 11
+	issuerSubpacket              signatureSubpacketType = 16
+	prefHashAlgosSubpacket       signatureSubpacketType = 21
+	prefCompressionSubpacket     signatureSubpacketType = 22
+	primaryUserIdSubpacket       signatureSubpacketType = 25
+	keyFlagsSubpacket            signatureSubpacketType = 27
+	reasonForRevocationSubpacket signatureSubpacketType = 29
+	featuresSubpacket            signatureSubpacketType = 30
+	embeddedSignatureSubpacket   signatureSubpacketType = 32
+)
+
+// parseSignatureSubpacket parses a single subpacket. len(subpacket) is >= 1.
+func parseSignatureSubpacket(sig *Signature, subpacket []byte, isHashed bool) (rest []byte, err error) {
+	// RFC 4880, section 5.2.3.1
+	var (
+		length     uint32
+		packetType signatureSubpacketType
+		isCritical bool
+	)
+	switch {
+	case subpacket[0] < 192:
+		length = uint32(subpacket[0])
+		subpacket = subpacket[1:]
+	case subpacket[0] < 255:
+		if len(subpacket) < 2 {
+			goto Truncated
+		}
+		length = uint32(subpacket[0]-192)<<8 + uint32(subpacket[1]) + 192
+		subpacket = subpacket[2:]
+	default:
+		if len(subpacket) < 5 {
+			goto Truncated
+		}
+		length = uint32(subpacket[1])<<24 |
+			uint32(subpacket[2])<<16 |
+			uint32(subpacket[3])<<8 |
+			uint32(subpacket[4])
+		subpacket = subpacket[5:]
+	}
+	if length > uint32(len(subpacket)) {
+		goto Truncated
+	}
+	rest = subpacket[length:]
+	subpacket = subpacket[:length]
+	if len(subpacket) == 0 {
+		err = errors.StructuralError("zero length signature subpacket")
+		return
+	}
+	packetType = signatureSubpacketType(subpacket[0] & 0x7f)
+	isCritical = subpacket[0]&0x80 == 0x80
+	subpacket = subpacket[1:]
+	sig.rawSubpackets = append(sig.rawSubpackets, outputSubpacket{isHashed, packetType, isCritical, subpacket})
+	switch packetType {
+	case creationTimeSubpacket:
+		if !isHashed {
+			err = errors.StructuralError("signature creation time in non-hashed area")
+			return
+		}
+		if len(subpacket) != 4 {
+			err = errors.StructuralError("signature creation time not four bytes")
+			return
+		}
+		t := binary.BigEndian.Uint32(subpacket)
+		sig.CreationTime = time.Unix(int64(t), 0)
+	case signatureExpirationSubpacket:
+		// Signature expiration time, section 5.2.3.10
+		if !isHashed {
+			return
+		}
+		if len(subpacket) != 4 {
+			err = errors.StructuralError("expiration subpacket with bad length")
+			return
+		}
+		sig.SigLifetimeSecs = new(uint32)
+		*sig.SigLifetimeSecs = binary.BigEndian.Uint32(subpacket)
+	case keyExpirationSubpacket:
+		// Key expiration time, section 5.2.3.6
+		if !isHashed {
+			return
+		}
+		if len(subpacket) != 4 {
+			err = errors.StructuralError("key expiration subpacket with bad length")
+			return
+		}
+		sig.KeyLifetimeSecs = new(uint32)
+		*sig.KeyLifetimeSecs = binary.BigEndian.Uint32(subpacket)
+	case prefSymmetricAlgosSubpacket:
+		// Preferred symmetric algorithms, section 5.2.3.7
+		if !isHashed {
+			return
+		}
+		sig.PreferredSymmetric = make([]byte, len(subpacket))
+		copy(sig.PreferredSymmetric, subpacket)
+	case issuerSubpacket:
+		// Issuer, section 5.2.3.5
+		if len(subpacket) != 8 {
+			err = errors.StructuralError("issuer subpacket with bad length")
+			return
+		}
+		sig.IssuerKeyId = new(uint64)
+		*sig.IssuerKeyId = binary.BigEndian.Uint64(subpacket)
+	case prefHashAlgosSubpacket:
+		// Preferred hash algorithms, section 5.2.3.8
+		if !isHashed {
+			return
+		}
+		sig.PreferredHash = make([]byte, len(subpacket))
+		copy(sig.PreferredHash, subpacket)
+	case prefCompressionSubpacket:
+		// Preferred compression algorithms, section 5.2.3.9
+		if !isHashed {
+			return
+		}
+		sig.PreferredCompression = make([]byte, len(subpacket))
+		copy(sig.PreferredCompression, subpacket)
+	case primaryUserIdSubpacket:
+		// Primary User ID, section 5.2.3.19
+		if !isHashed {
+			return
+		}
+		if len(subpacket) != 1 {
+			err = errors.StructuralError("primary user id subpacket with bad length")
+			return
+		}
+		sig.IsPrimaryId = new(bool)
+		if subpacket[0] > 0 {
+			*sig.IsPrimaryId = true
+		}
+	case keyFlagsSubpacket:
+		// Key flags, section 5.2.3.21
+		if !isHashed {
+			return
+		}
+		if len(subpacket) == 0 {
+			err = errors.StructuralError("empty key flags subpacket")
+			return
+		}
+		sig.FlagsValid = true
+		if subpacket[0]&KeyFlagCertify != 0 {
+			sig.FlagCertify = true
+		}
+		if subpacket[0]&KeyFlagSign != 0 {
+			sig.FlagSign = true
+		}
+		if subpacket[0]&KeyFlagEncryptCommunications != 0 {
+			sig.FlagEncryptCommunications = true
+		}
+		if subpacket[0]&KeyFlagEncryptStorage != 0 {
+			sig.FlagEncryptStorage = true
+		}
+	case reasonForRevocationSubpacket:
+		// Reason For Revocation, section 5.2.3.23
+		if !isHashed {
+			return
+		}
+		if len(subpacket) == 0 {
+			err = errors.StructuralError("empty revocation reason subpacket")
+			return
+		}
+		sig.RevocationReason = new(uint8)
+		*sig.RevocationReason = subpacket[0]
+		sig.RevocationReasonText = string(subpacket[1:])
+	case featuresSubpacket:
+		// Features subpacket, section 5.2.3.24 specifies a very general
+		// mechanism for OpenPGP implementations to signal support for new
+		// features. In practice, the subpacket is used exclusively to
+		// indicate support for MDC-protected encryption.
+		sig.MDC = len(subpacket) >= 1 && subpacket[0]&1 == 1
+	case embeddedSignatureSubpacket:
+		// Only usage is in signatures that cross-certify
+		// signing subkeys. section 5.2.3.26 describes the
+		// format, with its usage described in section 11.1
+		if sig.EmbeddedSignature != nil {
+			err = errors.StructuralError("Cannot have multiple embedded signatures")
+			return
+		}
+		sig.EmbeddedSignature = new(Signature)
+		// Embedded signatures are required to be v4 signatures see
+		// section 12.1. However, we only parse v4 signatures in this
+		// file anyway.
+		if err := sig.EmbeddedSignature.parse(bytes.NewBuffer(subpacket)); err != nil {
+			return nil, err
+		}
+		if sigType := sig.EmbeddedSignature.SigType; sigType != SigTypePrimaryKeyBinding {
+			return nil, errors.StructuralError("cross-signature has unexpected type " + strconv.Itoa(int(sigType)))
+		}
+	default:
+		if isCritical {
+			err = errors.UnsupportedError("unknown critical signature subpacket type " + strconv.Itoa(int(packetType)))
+			return
+		}
+	}
+	return
+
+Truncated:
+	err = errors.StructuralError("signature subpacket truncated")
+	return
+}
+
+// subpacketLengthLength returns the length, in bytes, of an encoded length value.
+func subpacketLengthLength(length int) int {
+	if length < 192 {
+		return 1
+	}
+	if length < 16320 {
+		return 2
+	}
+	return 5
+}
+
+// serializeSubpacketLength marshals the given length into to.
+func serializeSubpacketLength(to []byte, length int) int {
+	// RFC 4880, Section 4.2.2.
+	if length < 192 {
+		to[0] = byte(length)
+		return 1
+	}
+	if length < 16320 {
+		length -= 192
+		to[0] = byte((length >> 8) + 192)
+		to[1] = byte(length)
+		return 2
+	}
+	to[0] = 255
+	to[1] = byte(length >> 24)
+	to[2] = byte(length >> 16)
+	to[3] = byte(length >> 8)
+	to[4] = byte(length)
+	return 5
+}
+
+// subpacketsLength returns the serialized length, in bytes, of the given
+// subpackets.
+func subpacketsLength(subpackets []outputSubpacket, hashed bool) (length int) {
+	for _, subpacket := range subpackets {
+		if subpacket.hashed == hashed {
+			length += subpacketLengthLength(len(subpacket.contents) + 1)
+			length += 1 // type byte
+			length += len(subpacket.contents)
+		}
+	}
+	return
+}
+
+// serializeSubpackets marshals the given subpackets into to.
+func serializeSubpackets(to []byte, subpackets []outputSubpacket, hashed bool) {
+	for _, subpacket := range subpackets {
+		if subpacket.hashed == hashed {
+			n := serializeSubpacketLength(to, len(subpacket.contents)+1)
+			to[n] = byte(subpacket.subpacketType)
+			to = to[1+n:]
+			n = copy(to, subpacket.contents)
+			to = to[n:]
+		}
+	}
+	return
+}
+
+// KeyExpired returns whether sig is a self-signature of a key that has
+// expired.
+func (sig *Signature) KeyExpired(currentTime time.Time) bool {
+	if sig.KeyLifetimeSecs == nil {
+		return false
+	}
+	expiry := sig.CreationTime.Add(time.Duration(*sig.KeyLifetimeSecs) * time.Second)
+	return currentTime.After(expiry)
+}
+
+// buildHashSuffix constructs the HashSuffix member of sig in preparation for signing.
+func (sig *Signature) buildHashSuffix() (err error) {
+	hashedSubpacketsLen := subpacketsLength(sig.outSubpackets, true)
+
+	var ok bool
+	l := 6 + hashedSubpacketsLen
+	sig.HashSuffix = make([]byte, l+6)
+	sig.HashSuffix[0] = 4
+	sig.HashSuffix[1] = uint8(sig.SigType)
+	sig.HashSuffix[2] = uint8(sig.PubKeyAlgo)
+	sig.HashSuffix[3], ok = s2k.HashToHashId(sig.Hash)
+	if !ok {
+		sig.HashSuffix = nil
+		return errors.InvalidArgumentError("hash cannot be represented in OpenPGP: " + strconv.Itoa(int(sig.Hash)))
+	}
+	sig.HashSuffix[4] = byte(hashedSubpacketsLen >> 8)
+	sig.HashSuffix[5] = byte(hashedSubpacketsLen)
+	serializeSubpackets(sig.HashSuffix[6:l], sig.outSubpackets, true)
+	trailer := sig.HashSuffix[l:]
+	trailer[0] = 4
+	trailer[1] = 0xff
+	trailer[2] = byte(l >> 24)
+	trailer[3] = byte(l >> 16)
+	trailer[4] = byte(l >> 8)
+	trailer[5] = byte(l)
+	return
+}
+
+func (sig *Signature) signPrepareHash(h hash.Hash) (digest []byte, err error) {
+	err = sig.buildHashSuffix()
+	if err != nil {
+		return
+	}
+
+	h.Write(sig.HashSuffix)
+	digest = h.Sum(nil)
+	copy(sig.HashTag[:], digest)
+	return
+}
+
+// Sign signs a message with a private key. The hash, h, must contain
+// the hash of the message to be signed and will be mutated by this function.
+// On success, the signature is stored in sig. Call Serialize to write it out.
+// If config is nil, sensible defaults will be used.
+func (sig *Signature) Sign(h hash.Hash, priv *PrivateKey, config *Config) (err error) {
+	sig.outSubpackets = sig.buildSubpackets()
+	digest, err := sig.signPrepareHash(h)
+	if err != nil {
+		return
+	}
+
+	switch priv.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+		// supports both *rsa.PrivateKey and crypto.Signer
+		sig.RSASignature.bytes, err = priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, sig.Hash)
+		sig.RSASignature.bitLength = uint16(8 * len(sig.RSASignature.bytes))
+	case PubKeyAlgoDSA:
+		dsaPriv := priv.PrivateKey.(*dsa.PrivateKey)
+
+		// Need to truncate hashBytes to match FIPS 186-3 section 4.6.
+		subgroupSize := (dsaPriv.Q.BitLen() + 7) / 8
+		if len(digest) > subgroupSize {
+			digest = digest[:subgroupSize]
+		}
+		r, s, err := dsa.Sign(config.Random(), dsaPriv, digest)
+		if err == nil {
+			sig.DSASigR.bytes = r.Bytes()
+			sig.DSASigR.bitLength = uint16(8 * len(sig.DSASigR.bytes))
+			sig.DSASigS.bytes = s.Bytes()
+			sig.DSASigS.bitLength = uint16(8 * len(sig.DSASigS.bytes))
+		}
+	case PubKeyAlgoECDSA:
+		var r, s *big.Int
+		if pk, ok := priv.PrivateKey.(*ecdsa.PrivateKey); ok {
+			// direct support, avoid asn1 wrapping/unwrapping
+			r, s, err = ecdsa.Sign(config.Random(), pk, digest)
+		} else {
+			var b []byte
+			b, err = priv.PrivateKey.(crypto.Signer).Sign(config.Random(), digest, nil)
+			if err == nil {
+				r, s, err = unwrapECDSASig(b)
+			}
+		}
+		if err == nil {
+			sig.ECDSASigR = fromBig(r)
+			sig.ECDSASigS = fromBig(s)
+		}
+	default:
+		err = errors.UnsupportedError("public key algorithm: " + strconv.Itoa(int(sig.PubKeyAlgo)))
+	}
+
+	return
+}
+
+// unwrapECDSASig parses the two integer components of an ASN.1-encoded ECDSA
+// signature.
+func unwrapECDSASig(b []byte) (r, s *big.Int, err error) {
+	var ecsdaSig struct {
+		R, S *big.Int
+	}
+	_, err = asn1.Unmarshal(b, &ecsdaSig)
+	if err != nil {
+		return
+	}
+	return ecsdaSig.R, ecsdaSig.S, nil
+}
+
+// SignUserId computes a signature from priv, asserting that pub is a valid
+// key for the identity id.  On success, the signature is stored in sig. Call
+// Serialize to write it out.
+// If config is nil, sensible defaults will be used.
+func (sig *Signature) SignUserId(id string, pub *PublicKey, priv *PrivateKey, config *Config) error {
+	h, err := userIdSignatureHash(id, pub, sig.Hash)
+	if err != nil {
+		return err
+	}
+	return sig.Sign(h, priv, config)
+}
+
+// SignKey computes a signature from priv, asserting that pub is a subkey. On
+// success, the signature is stored in sig. Call Serialize to write it out.
+// If config is nil, sensible defaults will be used.
+func (sig *Signature) SignKey(pub *PublicKey, priv *PrivateKey, config *Config) error {
+	h, err := keySignatureHash(&priv.PublicKey, pub, sig.Hash)
+	if err != nil {
+		return err
+	}
+	return sig.Sign(h, priv, config)
+}
+
+// Serialize marshals sig to w. Sign, SignUserId or SignKey must have been
+// called first.
+func (sig *Signature) Serialize(w io.Writer) (err error) {
+	if len(sig.outSubpackets) == 0 {
+		sig.outSubpackets = sig.rawSubpackets
+	}
+	if sig.RSASignature.bytes == nil && sig.DSASigR.bytes == nil && sig.ECDSASigR.bytes == nil {
+		return errors.InvalidArgumentError("Signature: need to call Sign, SignUserId or SignKey before Serialize")
+	}
+
+	sigLength := 0
+	switch sig.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+		sigLength = 2 + len(sig.RSASignature.bytes)
+	case PubKeyAlgoDSA:
+		sigLength = 2 + len(sig.DSASigR.bytes)
+		sigLength += 2 + len(sig.DSASigS.bytes)
+	case PubKeyAlgoECDSA:
+		sigLength = 2 + len(sig.ECDSASigR.bytes)
+		sigLength += 2 + len(sig.ECDSASigS.bytes)
+	default:
+		panic("impossible")
+	}
+
+	unhashedSubpacketsLen := subpacketsLength(sig.outSubpackets, false)
+	length := len(sig.HashSuffix) - 6 /* trailer not included */ +
+		2 /* length of unhashed subpackets */ + unhashedSubpacketsLen +
+		2 /* hash tag */ + sigLength
+	err = serializeHeader(w, packetTypeSignature, length)
+	if err != nil {
+		return
+	}
+
+	_, err = w.Write(sig.HashSuffix[:len(sig.HashSuffix)-6])
+	if err != nil {
+		return
+	}
+
+	unhashedSubpackets := make([]byte, 2+unhashedSubpacketsLen)
+	unhashedSubpackets[0] = byte(unhashedSubpacketsLen >> 8)
+	unhashedSubpackets[1] = byte(unhashedSubpacketsLen)
+	serializeSubpackets(unhashedSubpackets[2:], sig.outSubpackets, false)
+
+	_, err = w.Write(unhashedSubpackets)
+	if err != nil {
+		return
+	}
+	_, err = w.Write(sig.HashTag[:])
+	if err != nil {
+		return
+	}
+
+	switch sig.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+		err = writeMPIs(w, sig.RSASignature)
+	case PubKeyAlgoDSA:
+		err = writeMPIs(w, sig.DSASigR, sig.DSASigS)
+	case PubKeyAlgoECDSA:
+		err = writeMPIs(w, sig.ECDSASigR, sig.ECDSASigS)
+	default:
+		panic("impossible")
+	}
+	return
+}
+
+// outputSubpacket represents a subpacket to be marshaled.
+type outputSubpacket struct {
+	hashed        bool // true if this subpacket is in the hashed area.
+	subpacketType signatureSubpacketType
+	isCritical    bool
+	contents      []byte
+}
+
+func (sig *Signature) buildSubpackets() (subpackets []outputSubpacket) {
+	creationTime := make([]byte, 4)
+	binary.BigEndian.PutUint32(creationTime, uint32(sig.CreationTime.Unix()))
+	subpackets = append(subpackets, outputSubpacket{true, creationTimeSubpacket, false, creationTime})
+
+	if sig.IssuerKeyId != nil {
+		keyId := make([]byte, 8)
+		binary.BigEndian.PutUint64(keyId, *sig.IssuerKeyId)
+		subpackets = append(subpackets, outputSubpacket{true, issuerSubpacket, false, keyId})
+	}
+
+	if sig.SigLifetimeSecs != nil && *sig.SigLifetimeSecs != 0 {
+		sigLifetime := make([]byte, 4)
+		binary.BigEndian.PutUint32(sigLifetime, *sig.SigLifetimeSecs)
+		subpackets = append(subpackets, outputSubpacket{true, signatureExpirationSubpacket, true, sigLifetime})
+	}
+
+	// Key flags may only appear in self-signatures or certification signatures.
+
+	if sig.FlagsValid {
+		var flags byte
+		if sig.FlagCertify {
+			flags |= KeyFlagCertify
+		}
+		if sig.FlagSign {
+			flags |= KeyFlagSign
+		}
+		if sig.FlagEncryptCommunications {
+			flags |= KeyFlagEncryptCommunications
+		}
+		if sig.FlagEncryptStorage {
+			flags |= KeyFlagEncryptStorage
+		}
+		subpackets = append(subpackets, outputSubpacket{true, keyFlagsSubpacket, false, []byte{flags}})
+	}
+
+	// The following subpackets may only appear in self-signatures
+
+	if sig.KeyLifetimeSecs != nil && *sig.KeyLifetimeSecs != 0 {
+		keyLifetime := make([]byte, 4)
+		binary.BigEndian.PutUint32(keyLifetime, *sig.KeyLifetimeSecs)
+		subpackets = append(subpackets, outputSubpacket{true, keyExpirationSubpacket, true, keyLifetime})
+	}
+
+	if sig.IsPrimaryId != nil && *sig.IsPrimaryId {
+		subpackets = append(subpackets, outputSubpacket{true, primaryUserIdSubpacket, false, []byte{1}})
+	}
+
+	if len(sig.PreferredSymmetric) > 0 {
+		subpackets = append(subpackets, outputSubpacket{true, prefSymmetricAlgosSubpacket, false, sig.PreferredSymmetric})
+	}
+
+	if len(sig.PreferredHash) > 0 {
+		subpackets = append(subpackets, outputSubpacket{true, prefHashAlgosSubpacket, false, sig.PreferredHash})
+	}
+
+	if len(sig.PreferredCompression) > 0 {
+		subpackets = append(subpackets, outputSubpacket{true, prefCompressionSubpacket, false, sig.PreferredCompression})
+	}
+
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/signature_v3.go

@@ -0,0 +1,146 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"crypto"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"strconv"
+	"time"
+
+	"golang.org/x/crypto/openpgp/errors"
+	"golang.org/x/crypto/openpgp/s2k"
+)
+
+// SignatureV3 represents older version 3 signatures. These signatures are less secure
+// than version 4 and should not be used to create new signatures. They are included
+// here for backwards compatibility to read and validate with older key material.
+// See RFC 4880, section 5.2.2.
+type SignatureV3 struct {
+	SigType      SignatureType
+	CreationTime time.Time
+	IssuerKeyId  uint64
+	PubKeyAlgo   PublicKeyAlgorithm
+	Hash         crypto.Hash
+	HashTag      [2]byte
+
+	RSASignature     parsedMPI
+	DSASigR, DSASigS parsedMPI
+}
+
+func (sig *SignatureV3) parse(r io.Reader) (err error) {
+	// RFC 4880, section 5.2.2
+	var buf [8]byte
+	if _, err = readFull(r, buf[:1]); err != nil {
+		return
+	}
+	if buf[0] < 2 || buf[0] > 3 {
+		err = errors.UnsupportedError("signature packet version " + strconv.Itoa(int(buf[0])))
+		return
+	}
+	if _, err = readFull(r, buf[:1]); err != nil {
+		return
+	}
+	if buf[0] != 5 {
+		err = errors.UnsupportedError(
+			"invalid hashed material length " + strconv.Itoa(int(buf[0])))
+		return
+	}
+
+	// Read hashed material: signature type + creation time
+	if _, err = readFull(r, buf[:5]); err != nil {
+		return
+	}
+	sig.SigType = SignatureType(buf[0])
+	t := binary.BigEndian.Uint32(buf[1:5])
+	sig.CreationTime = time.Unix(int64(t), 0)
+
+	// Eight-octet Key ID of signer.
+	if _, err = readFull(r, buf[:8]); err != nil {
+		return
+	}
+	sig.IssuerKeyId = binary.BigEndian.Uint64(buf[:])
+
+	// Public-key and hash algorithm
+	if _, err = readFull(r, buf[:2]); err != nil {
+		return
+	}
+	sig.PubKeyAlgo = PublicKeyAlgorithm(buf[0])
+	switch sig.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly, PubKeyAlgoDSA:
+	default:
+		err = errors.UnsupportedError("public key algorithm " + strconv.Itoa(int(sig.PubKeyAlgo)))
+		return
+	}
+	var ok bool
+	if sig.Hash, ok = s2k.HashIdToHash(buf[1]); !ok {
+		return errors.UnsupportedError("hash function " + strconv.Itoa(int(buf[2])))
+	}
+
+	// Two-octet field holding left 16 bits of signed hash value.
+	if _, err = readFull(r, sig.HashTag[:2]); err != nil {
+		return
+	}
+
+	switch sig.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+		sig.RSASignature.bytes, sig.RSASignature.bitLength, err = readMPI(r)
+	case PubKeyAlgoDSA:
+		if sig.DSASigR.bytes, sig.DSASigR.bitLength, err = readMPI(r); err != nil {
+			return
+		}
+		sig.DSASigS.bytes, sig.DSASigS.bitLength, err = readMPI(r)
+	default:
+		panic("unreachable")
+	}
+	return
+}
+
+// Serialize marshals sig to w. Sign, SignUserId or SignKey must have been
+// called first.
+func (sig *SignatureV3) Serialize(w io.Writer) (err error) {
+	buf := make([]byte, 8)
+
+	// Write the sig type and creation time
+	buf[0] = byte(sig.SigType)
+	binary.BigEndian.PutUint32(buf[1:5], uint32(sig.CreationTime.Unix()))
+	if _, err = w.Write(buf[:5]); err != nil {
+		return
+	}
+
+	// Write the issuer long key ID
+	binary.BigEndian.PutUint64(buf[:8], sig.IssuerKeyId)
+	if _, err = w.Write(buf[:8]); err != nil {
+		return
+	}
+
+	// Write public key algorithm, hash ID, and hash value
+	buf[0] = byte(sig.PubKeyAlgo)
+	hashId, ok := s2k.HashToHashId(sig.Hash)
+	if !ok {
+		return errors.UnsupportedError(fmt.Sprintf("hash function %v", sig.Hash))
+	}
+	buf[1] = hashId
+	copy(buf[2:4], sig.HashTag[:])
+	if _, err = w.Write(buf[:4]); err != nil {
+		return
+	}
+
+	if sig.RSASignature.bytes == nil && sig.DSASigR.bytes == nil {
+		return errors.InvalidArgumentError("Signature: need to call Sign, SignUserId or SignKey before Serialize")
+	}
+
+	switch sig.PubKeyAlgo {
+	case PubKeyAlgoRSA, PubKeyAlgoRSASignOnly:
+		err = writeMPIs(w, sig.RSASignature)
+	case PubKeyAlgoDSA:
+		err = writeMPIs(w, sig.DSASigR, sig.DSASigS)
+	default:
+		panic("impossible")
+	}
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/symmetric_key_encrypted.go

@@ -0,0 +1,155 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"bytes"
+	"crypto/cipher"
+	"io"
+	"strconv"
+
+	"golang.org/x/crypto/openpgp/errors"
+	"golang.org/x/crypto/openpgp/s2k"
+)
+
+// This is the largest session key that we'll support. Since no 512-bit cipher
+// has even been seriously used, this is comfortably large.
+const maxSessionKeySizeInBytes = 64
+
+// SymmetricKeyEncrypted represents a passphrase protected session key. See RFC
+// 4880, section 5.3.
+type SymmetricKeyEncrypted struct {
+	CipherFunc   CipherFunction
+	s2k          func(out, in []byte)
+	encryptedKey []byte
+}
+
+const symmetricKeyEncryptedVersion = 4
+
+func (ske *SymmetricKeyEncrypted) parse(r io.Reader) error {
+	// RFC 4880, section 5.3.
+	var buf [2]byte
+	if _, err := readFull(r, buf[:]); err != nil {
+		return err
+	}
+	if buf[0] != symmetricKeyEncryptedVersion {
+		return errors.UnsupportedError("SymmetricKeyEncrypted version")
+	}
+	ske.CipherFunc = CipherFunction(buf[1])
+
+	if ske.CipherFunc.KeySize() == 0 {
+		return errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(buf[1])))
+	}
+
+	var err error
+	ske.s2k, err = s2k.Parse(r)
+	if err != nil {
+		return err
+	}
+
+	encryptedKey := make([]byte, maxSessionKeySizeInBytes)
+	// The session key may follow. We just have to try and read to find
+	// out. If it exists then we limit it to maxSessionKeySizeInBytes.
+	n, err := readFull(r, encryptedKey)
+	if err != nil && err != io.ErrUnexpectedEOF {
+		return err
+	}
+
+	if n != 0 {
+		if n == maxSessionKeySizeInBytes {
+			return errors.UnsupportedError("oversized encrypted session key")
+		}
+		ske.encryptedKey = encryptedKey[:n]
+	}
+
+	return nil
+}
+
+// Decrypt attempts to decrypt an encrypted session key and returns the key and
+// the cipher to use when decrypting a subsequent Symmetrically Encrypted Data
+// packet.
+func (ske *SymmetricKeyEncrypted) Decrypt(passphrase []byte) ([]byte, CipherFunction, error) {
+	key := make([]byte, ske.CipherFunc.KeySize())
+	ske.s2k(key, passphrase)
+
+	if len(ske.encryptedKey) == 0 {
+		return key, ske.CipherFunc, nil
+	}
+
+	// the IV is all zeros
+	iv := make([]byte, ske.CipherFunc.blockSize())
+	c := cipher.NewCFBDecrypter(ske.CipherFunc.new(key), iv)
+	plaintextKey := make([]byte, len(ske.encryptedKey))
+	c.XORKeyStream(plaintextKey, ske.encryptedKey)
+	cipherFunc := CipherFunction(plaintextKey[0])
+	if cipherFunc.blockSize() == 0 {
+		return nil, ske.CipherFunc, errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(cipherFunc)))
+	}
+	plaintextKey = plaintextKey[1:]
+	if l := len(plaintextKey); l == 0 || l%cipherFunc.blockSize() != 0 {
+		return nil, cipherFunc, errors.StructuralError("length of decrypted key not a multiple of block size")
+	}
+
+	return plaintextKey, cipherFunc, nil
+}
+
+// SerializeSymmetricKeyEncrypted serializes a symmetric key packet to w. The
+// packet contains a random session key, encrypted by a key derived from the
+// given passphrase. The session key is returned and must be passed to
+// SerializeSymmetricallyEncrypted.
+// If config is nil, sensible defaults will be used.
+func SerializeSymmetricKeyEncrypted(w io.Writer, passphrase []byte, config *Config) (key []byte, err error) {
+	cipherFunc := config.Cipher()
+	keySize := cipherFunc.KeySize()
+	if keySize == 0 {
+		return nil, errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(cipherFunc)))
+	}
+
+	s2kBuf := new(bytes.Buffer)
+	keyEncryptingKey := make([]byte, keySize)
+	// s2k.Serialize salts and stretches the passphrase, and writes the
+	// resulting key to keyEncryptingKey and the s2k descriptor to s2kBuf.
+	err = s2k.Serialize(s2kBuf, keyEncryptingKey, config.Random(), passphrase, &s2k.Config{Hash: config.Hash(), S2KCount: config.PasswordHashIterations()})
+	if err != nil {
+		return
+	}
+	s2kBytes := s2kBuf.Bytes()
+
+	packetLength := 2 /* header */ + len(s2kBytes) + 1 /* cipher type */ + keySize
+	err = serializeHeader(w, packetTypeSymmetricKeyEncrypted, packetLength)
+	if err != nil {
+		return
+	}
+
+	var buf [2]byte
+	buf[0] = symmetricKeyEncryptedVersion
+	buf[1] = byte(cipherFunc)
+	_, err = w.Write(buf[:])
+	if err != nil {
+		return
+	}
+	_, err = w.Write(s2kBytes)
+	if err != nil {
+		return
+	}
+
+	sessionKey := make([]byte, keySize)
+	_, err = io.ReadFull(config.Random(), sessionKey)
+	if err != nil {
+		return
+	}
+	iv := make([]byte, cipherFunc.blockSize())
+	c := cipher.NewCFBEncrypter(cipherFunc.new(keyEncryptingKey), iv)
+	encryptedCipherAndKey := make([]byte, keySize+1)
+	c.XORKeyStream(encryptedCipherAndKey, buf[1:])
+	c.XORKeyStream(encryptedCipherAndKey[1:], sessionKey)
+	_, err = w.Write(encryptedCipherAndKey)
+	if err != nil {
+		return
+	}
+
+	key = sessionKey
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/symmetrically_encrypted.go

@@ -0,0 +1,290 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"crypto/cipher"
+	"crypto/sha1"
+	"crypto/subtle"
+	"golang.org/x/crypto/openpgp/errors"
+	"hash"
+	"io"
+	"strconv"
+)
+
+// SymmetricallyEncrypted represents a symmetrically encrypted byte string. The
+// encrypted contents will consist of more OpenPGP packets. See RFC 4880,
+// sections 5.7 and 5.13.
+type SymmetricallyEncrypted struct {
+	MDC      bool // true iff this is a type 18 packet and thus has an embedded MAC.
+	contents io.Reader
+	prefix   []byte
+}
+
+const symmetricallyEncryptedVersion = 1
+
+func (se *SymmetricallyEncrypted) parse(r io.Reader) error {
+	if se.MDC {
+		// See RFC 4880, section 5.13.
+		var buf [1]byte
+		_, err := readFull(r, buf[:])
+		if err != nil {
+			return err
+		}
+		if buf[0] != symmetricallyEncryptedVersion {
+			return errors.UnsupportedError("unknown SymmetricallyEncrypted version")
+		}
+	}
+	se.contents = r
+	return nil
+}
+
+// Decrypt returns a ReadCloser, from which the decrypted contents of the
+// packet can be read. An incorrect key can, with high probability, be detected
+// immediately and this will result in a KeyIncorrect error being returned.
+func (se *SymmetricallyEncrypted) Decrypt(c CipherFunction, key []byte) (io.ReadCloser, error) {
+	keySize := c.KeySize()
+	if keySize == 0 {
+		return nil, errors.UnsupportedError("unknown cipher: " + strconv.Itoa(int(c)))
+	}
+	if len(key) != keySize {
+		return nil, errors.InvalidArgumentError("SymmetricallyEncrypted: incorrect key length")
+	}
+
+	if se.prefix == nil {
+		se.prefix = make([]byte, c.blockSize()+2)
+		_, err := readFull(se.contents, se.prefix)
+		if err != nil {
+			return nil, err
+		}
+	} else if len(se.prefix) != c.blockSize()+2 {
+		return nil, errors.InvalidArgumentError("can't try ciphers with different block lengths")
+	}
+
+	ocfbResync := OCFBResync
+	if se.MDC {
+		// MDC packets use a different form of OCFB mode.
+		ocfbResync = OCFBNoResync
+	}
+
+	s := NewOCFBDecrypter(c.new(key), se.prefix, ocfbResync)
+	if s == nil {
+		return nil, errors.ErrKeyIncorrect
+	}
+
+	plaintext := cipher.StreamReader{S: s, R: se.contents}
+
+	if se.MDC {
+		// MDC packets have an embedded hash that we need to check.
+		h := sha1.New()
+		h.Write(se.prefix)
+		return &seMDCReader{in: plaintext, h: h}, nil
+	}
+
+	// Otherwise, we just need to wrap plaintext so that it's a valid ReadCloser.
+	return seReader{plaintext}, nil
+}
+
+// seReader wraps an io.Reader with a no-op Close method.
+type seReader struct {
+	in io.Reader
+}
+
+func (ser seReader) Read(buf []byte) (int, error) {
+	return ser.in.Read(buf)
+}
+
+func (ser seReader) Close() error {
+	return nil
+}
+
+const mdcTrailerSize = 1 /* tag byte */ + 1 /* length byte */ + sha1.Size
+
+// An seMDCReader wraps an io.Reader, maintains a running hash and keeps hold
+// of the most recent 22 bytes (mdcTrailerSize). Upon EOF, those bytes form an
+// MDC packet containing a hash of the previous contents which is checked
+// against the running hash. See RFC 4880, section 5.13.
+type seMDCReader struct {
+	in          io.Reader
+	h           hash.Hash
+	trailer     [mdcTrailerSize]byte
+	scratch     [mdcTrailerSize]byte
+	trailerUsed int
+	error       bool
+	eof         bool
+}
+
+func (ser *seMDCReader) Read(buf []byte) (n int, err error) {
+	if ser.error {
+		err = io.ErrUnexpectedEOF
+		return
+	}
+	if ser.eof {
+		err = io.EOF
+		return
+	}
+
+	// If we haven't yet filled the trailer buffer then we must do that
+	// first.
+	for ser.trailerUsed < mdcTrailerSize {
+		n, err = ser.in.Read(ser.trailer[ser.trailerUsed:])
+		ser.trailerUsed += n
+		if err == io.EOF {
+			if ser.trailerUsed != mdcTrailerSize {
+				n = 0
+				err = io.ErrUnexpectedEOF
+				ser.error = true
+				return
+			}
+			ser.eof = true
+			n = 0
+			return
+		}
+
+		if err != nil {
+			n = 0
+			return
+		}
+	}
+
+	// If it's a short read then we read into a temporary buffer and shift
+	// the data into the caller's buffer.
+	if len(buf) <= mdcTrailerSize {
+		n, err = readFull(ser.in, ser.scratch[:len(buf)])
+		copy(buf, ser.trailer[:n])
+		ser.h.Write(buf[:n])
+		copy(ser.trailer[:], ser.trailer[n:])
+		copy(ser.trailer[mdcTrailerSize-n:], ser.scratch[:])
+		if n < len(buf) {
+			ser.eof = true
+			err = io.EOF
+		}
+		return
+	}
+
+	n, err = ser.in.Read(buf[mdcTrailerSize:])
+	copy(buf, ser.trailer[:])
+	ser.h.Write(buf[:n])
+	copy(ser.trailer[:], buf[n:])
+
+	if err == io.EOF {
+		ser.eof = true
+	}
+	return
+}
+
+// This is a new-format packet tag byte for a type 19 (MDC) packet.
+const mdcPacketTagByte = byte(0x80) | 0x40 | 19
+
+func (ser *seMDCReader) Close() error {
+	if ser.error {
+		return errors.SignatureError("error during reading")
+	}
+
+	for !ser.eof {
+		// We haven't seen EOF so we need to read to the end
+		var buf [1024]byte
+		_, err := ser.Read(buf[:])
+		if err == io.EOF {
+			break
+		}
+		if err != nil {
+			return errors.SignatureError("error during reading")
+		}
+	}
+
+	if ser.trailer[0] != mdcPacketTagByte || ser.trailer[1] != sha1.Size {
+		return errors.SignatureError("MDC packet not found")
+	}
+	ser.h.Write(ser.trailer[:2])
+
+	final := ser.h.Sum(nil)
+	if subtle.ConstantTimeCompare(final, ser.trailer[2:]) != 1 {
+		return errors.SignatureError("hash mismatch")
+	}
+	return nil
+}
+
+// An seMDCWriter writes through to an io.WriteCloser while maintains a running
+// hash of the data written. On close, it emits an MDC packet containing the
+// running hash.
+type seMDCWriter struct {
+	w io.WriteCloser
+	h hash.Hash
+}
+
+func (w *seMDCWriter) Write(buf []byte) (n int, err error) {
+	w.h.Write(buf)
+	return w.w.Write(buf)
+}
+
+func (w *seMDCWriter) Close() (err error) {
+	var buf [mdcTrailerSize]byte
+
+	buf[0] = mdcPacketTagByte
+	buf[1] = sha1.Size
+	w.h.Write(buf[:2])
+	digest := w.h.Sum(nil)
+	copy(buf[2:], digest)
+
+	_, err = w.w.Write(buf[:])
+	if err != nil {
+		return
+	}
+	return w.w.Close()
+}
+
+// noOpCloser is like an ioutil.NopCloser, but for an io.Writer.
+type noOpCloser struct {
+	w io.Writer
+}
+
+func (c noOpCloser) Write(data []byte) (n int, err error) {
+	return c.w.Write(data)
+}
+
+func (c noOpCloser) Close() error {
+	return nil
+}
+
+// SerializeSymmetricallyEncrypted serializes a symmetrically encrypted packet
+// to w and returns a WriteCloser to which the to-be-encrypted packets can be
+// written.
+// If config is nil, sensible defaults will be used.
+func SerializeSymmetricallyEncrypted(w io.Writer, c CipherFunction, key []byte, config *Config) (contents io.WriteCloser, err error) {
+	if c.KeySize() != len(key) {
+		return nil, errors.InvalidArgumentError("SymmetricallyEncrypted.Serialize: bad key length")
+	}
+	writeCloser := noOpCloser{w}
+	ciphertext, err := serializeStreamHeader(writeCloser, packetTypeSymmetricallyEncryptedMDC)
+	if err != nil {
+		return
+	}
+
+	_, err = ciphertext.Write([]byte{symmetricallyEncryptedVersion})
+	if err != nil {
+		return
+	}
+
+	block := c.new(key)
+	blockSize := block.BlockSize()
+	iv := make([]byte, blockSize)
+	_, err = config.Random().Read(iv)
+	if err != nil {
+		return
+	}
+	s, prefix := NewOCFBEncrypter(block, iv, OCFBNoResync)
+	_, err = ciphertext.Write(prefix)
+	if err != nil {
+		return
+	}
+	plaintext := cipher.StreamWriter{S: s, W: ciphertext}
+
+	h := sha1.New()
+	h.Write(iv)
+	h.Write(iv[blockSize-2:])
+	contents = &seMDCWriter{w: plaintext, h: h}
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/userattribute.go

@@ -0,0 +1,91 @@
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"bytes"
+	"image"
+	"image/jpeg"
+	"io"
+	"io/ioutil"
+)
+
+const UserAttrImageSubpacket = 1
+
+// UserAttribute is capable of storing other types of data about a user
+// beyond name, email and a text comment. In practice, user attributes are typically used
+// to store a signed thumbnail photo JPEG image of the user.
+// See RFC 4880, section 5.12.
+type UserAttribute struct {
+	Contents []*OpaqueSubpacket
+}
+
+// NewUserAttributePhoto creates a user attribute packet
+// containing the given images.
+func NewUserAttributePhoto(photos ...image.Image) (uat *UserAttribute, err error) {
+	uat = new(UserAttribute)
+	for _, photo := range photos {
+		var buf bytes.Buffer
+		// RFC 4880, Section 5.12.1.
+		data := []byte{
+			0x10, 0x00, // Little-endian image header length (16 bytes)
+			0x01,       // Image header version 1
+			0x01,       // JPEG
+			0, 0, 0, 0, // 12 reserved octets, must be all zero.
+			0, 0, 0, 0,
+			0, 0, 0, 0}
+		if _, err = buf.Write(data); err != nil {
+			return
+		}
+		if err = jpeg.Encode(&buf, photo, nil); err != nil {
+			return
+		}
+		uat.Contents = append(uat.Contents, &OpaqueSubpacket{
+			SubType:  UserAttrImageSubpacket,
+			Contents: buf.Bytes()})
+	}
+	return
+}
+
+// NewUserAttribute creates a new user attribute packet containing the given subpackets.
+func NewUserAttribute(contents ...*OpaqueSubpacket) *UserAttribute {
+	return &UserAttribute{Contents: contents}
+}
+
+func (uat *UserAttribute) parse(r io.Reader) (err error) {
+	// RFC 4880, section 5.13
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		return
+	}
+	uat.Contents, err = OpaqueSubpackets(b)
+	return
+}
+
+// Serialize marshals the user attribute to w in the form of an OpenPGP packet, including
+// header.
+func (uat *UserAttribute) Serialize(w io.Writer) (err error) {
+	var buf bytes.Buffer
+	for _, sp := range uat.Contents {
+		sp.Serialize(&buf)
+	}
+	if err = serializeHeader(w, packetTypeUserAttribute, buf.Len()); err != nil {
+		return err
+	}
+	_, err = w.Write(buf.Bytes())
+	return
+}
+
+// ImageData returns zero or more byte slices, each containing
+// JPEG File Interchange Format (JFIF), for each photo in the
+// the user attribute packet.
+func (uat *UserAttribute) ImageData() (imageData [][]byte) {
+	for _, sp := range uat.Contents {
+		if sp.SubType == UserAttrImageSubpacket && len(sp.Contents) > 16 {
+			imageData = append(imageData, sp.Contents[16:])
+		}
+	}
+	return
+}

vendor/golang.org/x/crypto/openpgp/packet/userid.go

@@ -0,0 +1,160 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package packet
+
+import (
+	"io"
+	"io/ioutil"
+	"strings"
+)
+
+// UserId contains text that is intended to represent the name and email
+// address of the key holder. See RFC 4880, section 5.11. By convention, this
+// takes the form "Full Name (Comment) <email@example.com>"
+type UserId struct {
+	Id string // By convention, this takes the form "Full Name (Comment) <email@example.com>" which is split out in the fields below.
+
+	Name, Comment, Email string
+}
+
+func hasInvalidCharacters(s string) bool {
+	for _, c := range s {
+		switch c {
+		case '(', ')', '<', '>', 0:
+			return true
+		}
+	}
+	return false
+}
+
+// NewUserId returns a UserId or nil if any of the arguments contain invalid
+// characters. The invalid characters are '\x00', '(', ')', '<' and '>'
+func NewUserId(name, comment, email string) *UserId {
+	// RFC 4880 doesn't deal with the structure of userid strings; the
+	// name, comment and email form is just a convention. However, there's
+	// no convention about escaping the metacharacters and GPG just refuses
+	// to create user ids where, say, the name contains a '('. We mirror
+	// this behaviour.
+
+	if hasInvalidCharacters(name) || hasInvalidCharacters(comment) || hasInvalidCharacters(email) {
+		return nil
+	}
+
+	uid := new(UserId)
+	uid.Name, uid.Comment, uid.Email = name, comment, email
+	uid.Id = name
+	if len(comment) > 0 {
+		if len(uid.Id) > 0 {
+			uid.Id += " "
+		}
+		uid.Id += "("
+		uid.Id += comment
+		uid.Id += ")"
+	}
+	if len(email) > 0 {
+		if len(uid.Id) > 0 {
+			uid.Id += " "
+		}
+		uid.Id += "<"
+		uid.Id += email
+		uid.Id += ">"
+	}
+	return uid
+}
+
+func (uid *UserId) parse(r io.Reader) (err error) {
+	// RFC 4880, section 5.11
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		return
+	}
+	uid.Id = string(b)
+	uid.Name, uid.Comment, uid.Email = parseUserId(uid.Id)
+	return
+}
+
+// Serialize marshals uid to w in the form of an OpenPGP packet, including
+// header.
+func (uid *UserId) Serialize(w io.Writer) error {
+	err := serializeHeader(w, packetTypeUserId, len(uid.Id))
+	if err != nil {
+		return err
+	}
+	_, err = w.Write([]byte(uid.Id))
+	return err
+}
+
+// parseUserId extracts the name, comment and email from a user id string that
+// is formatted as "Full Name (Comment) <email@example.com>".
+func parseUserId(id string) (name, comment, email string) {
+	var n, c, e struct {
+		start, end int
+	}
+	var state int
+
+	for offset, rune := range id {
+		switch state {
+		case 0:
+			// Entering name
+			n.start = offset
+			state = 1
+			fallthrough
+		case 1:
+			// In name
+			if rune == '(' {
+				state = 2
+				n.end = offset
+			} else if rune == '<' {
+				state = 5
+				n.end = offset
+			}
+		case 2:
+			// Entering comment
+			c.start = offset
+			state = 3
+			fallthrough
+		case 3:
+			// In comment
+			if rune == ')' {
+				state = 4
+				c.end = offset
+			}
+		case 4:
+			// Between comment and email
+			if rune == '<' {
+				state = 5
+			}
+		case 5:
+			// Entering email
+			e.start = offset
+			state = 6
+			fallthrough
+		case 6:
+			// In email
+			if rune == '>' {
+				state = 7
+				e.end = offset
+			}
+		default:
+			// After email
+		}
+	}
+	switch state {
+	case 1:
+		// ended in the name
+		n.end = len(id)
+	case 3:
+		// ended in comment
+		c.end = len(id)
+	case 6:
+		// ended in email
+		e.end = len(id)
+	}
+
+	name = strings.TrimSpace(id[n.start:n.end])
+	comment = strings.TrimSpace(id[c.start:c.end])
+	email = strings.TrimSpace(id[e.start:e.end])
+	return
+}

vendor/golang.org/x/crypto/openpgp/read.go

@@ -0,0 +1,442 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package openpgp implements high level operations on OpenPGP messages.
+package openpgp // import "golang.org/x/crypto/openpgp"
+
+import (
+	"crypto"
+	_ "crypto/sha256"
+	"hash"
+	"io"
+	"strconv"
+
+	"golang.org/x/crypto/openpgp/armor"
+	"golang.org/x/crypto/openpgp/errors"
+	"golang.org/x/crypto/openpgp/packet"
+)
+
+// SignatureType is the armor type for a PGP signature.
+var SignatureType = "PGP SIGNATURE"
+
+// readArmored reads an armored block with the given type.
+func readArmored(r io.Reader, expectedType string) (body io.Reader, err error) {
+	block, err := armor.Decode(r)
+	if err != nil {
+		return
+	}
+
+	if block.Type != expectedType {
+		return nil, errors.InvalidArgumentError("expected '" + expectedType + "', got: " + block.Type)
+	}
+
+	return block.Body, nil
+}
+
+// MessageDetails contains the result of parsing an OpenPGP encrypted and/or
+// signed message.
+type MessageDetails struct {
+	IsEncrypted              bool                // true if the message was encrypted.
+	EncryptedToKeyIds        []uint64            // the list of recipient key ids.
+	IsSymmetricallyEncrypted bool                // true if a passphrase could have decrypted the message.
+	DecryptedWith            Key                 // the private key used to decrypt the message, if any.
+	IsSigned                 bool                // true if the message is signed.
+	SignedByKeyId            uint64              // the key id of the signer, if any.
+	SignedBy                 *Key                // the key of the signer, if available.
+	LiteralData              *packet.LiteralData // the metadata of the contents
+	UnverifiedBody           io.Reader           // the contents of the message.
+
+	// If IsSigned is true and SignedBy is non-zero then the signature will
+	// be verified as UnverifiedBody is read. The signature cannot be
+	// checked until the whole of UnverifiedBody is read so UnverifiedBody
+	// must be consumed until EOF before the data can be trusted. Even if a
+	// message isn't signed (or the signer is unknown) the data may contain
+	// an authentication code that is only checked once UnverifiedBody has
+	// been consumed. Once EOF has been seen, the following fields are
+	// valid. (An authentication code failure is reported as a
+	// SignatureError error when reading from UnverifiedBody.)
+	SignatureError error               // nil if the signature is good.
+	Signature      *packet.Signature   // the signature packet itself, if v4 (default)
+	SignatureV3    *packet.SignatureV3 // the signature packet if it is a v2 or v3 signature
+
+	decrypted io.ReadCloser
+}
+
+// A PromptFunction is used as a callback by functions that may need to decrypt
+// a private key, or prompt for a passphrase. It is called with a list of
+// acceptable, encrypted private keys and a boolean that indicates whether a
+// passphrase is usable. It should either decrypt a private key or return a
+// passphrase to try. If the decrypted private key or given passphrase isn't
+// correct, the function will be called again, forever. Any error returned will
+// be passed up.
+type PromptFunction func(keys []Key, symmetric bool) ([]byte, error)
+
+// A keyEnvelopePair is used to store a private key with the envelope that
+// contains a symmetric key, encrypted with that key.
+type keyEnvelopePair struct {
+	key          Key
+	encryptedKey *packet.EncryptedKey
+}
+
+// ReadMessage parses an OpenPGP message that may be signed and/or encrypted.
+// The given KeyRing should contain both public keys (for signature
+// verification) and, possibly encrypted, private keys for decrypting.
+// If config is nil, sensible defaults will be used.
+func ReadMessage(r io.Reader, keyring KeyRing, prompt PromptFunction, config *packet.Config) (md *MessageDetails, err error) {
+	var p packet.Packet
+
+	var symKeys []*packet.SymmetricKeyEncrypted
+	var pubKeys []keyEnvelopePair
+	var se *packet.SymmetricallyEncrypted
+
+	packets := packet.NewReader(r)
+	md = new(MessageDetails)
+	md.IsEncrypted = true
+
+	// The message, if encrypted, starts with a number of packets
+	// containing an encrypted decryption key. The decryption key is either
+	// encrypted to a public key, or with a passphrase. This loop
+	// collects these packets.
+ParsePackets:
+	for {
+		p, err = packets.Next()
+		if err != nil {
+			return nil, err
+		}
+		switch p := p.(type) {
+		case *packet.SymmetricKeyEncrypted:
+			// This packet contains the decryption key encrypted with a passphrase.
+			md.IsSymmetricallyEncrypted = true
+			symKeys = append(symKeys, p)
+		case *packet.EncryptedKey:
+			// This packet contains the decryption key encrypted to a public key.
+			md.EncryptedToKeyIds = append(md.EncryptedToKeyIds, p.KeyId)
+			switch p.Algo {
+			case packet.PubKeyAlgoRSA, packet.PubKeyAlgoRSAEncryptOnly, packet.PubKeyAlgoElGamal:
+				break
+			default:
+				continue
+			}
+			var keys []Key
+			if p.KeyId == 0 {
+				keys = keyring.DecryptionKeys()
+			} else {
+				keys = keyring.KeysById(p.KeyId)
+			}
+			for _, k := range keys {
+				pubKeys = append(pubKeys, keyEnvelopePair{k, p})
+			}
+		case *packet.SymmetricallyEncrypted:
+			se = p
+			break ParsePackets
+		case *packet.Compressed, *packet.LiteralData, *packet.OnePassSignature:
+			// This message isn't encrypted.
+			if len(symKeys) != 0 || len(pubKeys) != 0 {
+				return nil, errors.StructuralError("key material not followed by encrypted message")
+			}
+			packets.Unread(p)
+			return readSignedMessage(packets, nil, keyring)
+		}
+	}
+
+	var candidates []Key
+	var decrypted io.ReadCloser
+
+	// Now that we have the list of encrypted keys we need to decrypt at
+	// least one of them or, if we cannot, we need to call the prompt
+	// function so that it can decrypt a key or give us a passphrase.
+FindKey:
+	for {
+		// See if any of the keys already have a private key available
+		candidates = candidates[:0]
+		candidateFingerprints := make(map[string]bool)
+
+		for _, pk := range pubKeys {
+			if pk.key.PrivateKey == nil {
+				continue
+			}
+			if !pk.key.PrivateKey.Encrypted {
+				if len(pk.encryptedKey.Key) == 0 {
+					pk.encryptedKey.Decrypt(pk.key.PrivateKey, config)
+				}
+				if len(pk.encryptedKey.Key) == 0 {
+					continue
+				}
+				decrypted, err = se.Decrypt(pk.encryptedKey.CipherFunc, pk.encryptedKey.Key)
+				if err != nil && err != errors.ErrKeyIncorrect {
+					return nil, err
+				}
+				if decrypted != nil {
+					md.DecryptedWith = pk.key
+					break FindKey
+				}
+			} else {
+				fpr := string(pk.key.PublicKey.Fingerprint[:])
+				if v := candidateFingerprints[fpr]; v {
+					continue
+				}
+				candidates = append(candidates, pk.key)
+				candidateFingerprints[fpr] = true
+			}
+		}
+
+		if len(candidates) == 0 && len(symKeys) == 0 {
+			return nil, errors.ErrKeyIncorrect
+		}
+
+		if prompt == nil {
+			return nil, errors.ErrKeyIncorrect
+		}
+
+		passphrase, err := prompt(candidates, len(symKeys) != 0)
+		if err != nil {
+			return nil, err
+		}
+
+		// Try the symmetric passphrase first
+		if len(symKeys) != 0 && passphrase != nil {
+			for _, s := range symKeys {
+				key, cipherFunc, err := s.Decrypt(passphrase)
+				if err == nil {
+					decrypted, err = se.Decrypt(cipherFunc, key)
+					if err != nil && err != errors.ErrKeyIncorrect {
+						return nil, err
+					}
+					if decrypted != nil {
+						break FindKey
+					}
+				}
+
+			}
+		}
+	}
+
+	md.decrypted = decrypted
+	if err := packets.Push(decrypted); err != nil {
+		return nil, err
+	}
+	return readSignedMessage(packets, md, keyring)
+}
+
+// readSignedMessage reads a possibly signed message if mdin is non-zero then
+// that structure is updated and returned. Otherwise a fresh MessageDetails is
+// used.
+func readSignedMessage(packets *packet.Reader, mdin *MessageDetails, keyring KeyRing) (md *MessageDetails, err error) {
+	if mdin == nil {
+		mdin = new(MessageDetails)
+	}
+	md = mdin
+
+	var p packet.Packet
+	var h hash.Hash
+	var wrappedHash hash.Hash
+FindLiteralData:
+	for {
+		p, err = packets.Next()
+		if err != nil {
+			return nil, err
+		}
+		switch p := p.(type) {
+		case *packet.Compressed:
+			if err := packets.Push(p.Body); err != nil {
+				return nil, err
+			}
+		case *packet.OnePassSignature:
+			if !p.IsLast {
+				return nil, errors.UnsupportedError("nested signatures")
+			}
+
+			h, wrappedHash, err = hashForSignature(p.Hash, p.SigType)
+			if err != nil {
+				md = nil
+				return
+			}
+
+			md.IsSigned = true
+			md.SignedByKeyId = p.KeyId
+			keys := keyring.KeysByIdUsage(p.KeyId, packet.KeyFlagSign)
+			if len(keys) > 0 {
+				md.SignedBy = &keys[0]
+			}
+		case *packet.LiteralData:
+			md.LiteralData = p
+			break FindLiteralData
+		}
+	}
+
+	if md.SignedBy != nil {
+		md.UnverifiedBody = &signatureCheckReader{packets, h, wrappedHash, md}
+	} else if md.decrypted != nil {
+		md.UnverifiedBody = checkReader{md}
+	} else {
+		md.UnverifiedBody = md.LiteralData.Body
+	}
+
+	return md, nil
+}
+
+// hashForSignature returns a pair of hashes that can be used to verify a
+// signature. The signature may specify that the contents of the signed message
+// should be preprocessed (i.e. to normalize line endings). Thus this function
+// returns two hashes. The second should be used to hash the message itself and
+// performs any needed preprocessing.
+func hashForSignature(hashId crypto.Hash, sigType packet.SignatureType) (hash.Hash, hash.Hash, error) {
+	if !hashId.Available() {
+		return nil, nil, errors.UnsupportedError("hash not available: " + strconv.Itoa(int(hashId)))
+	}
+	h := hashId.New()
+
+	switch sigType {
+	case packet.SigTypeBinary:
+		return h, h, nil
+	case packet.SigTypeText:
+		return h, NewCanonicalTextHash(h), nil
+	}
+
+	return nil, nil, errors.UnsupportedError("unsupported signature type: " + strconv.Itoa(int(sigType)))
+}
+
+// checkReader wraps an io.Reader from a LiteralData packet. When it sees EOF
+// it closes the ReadCloser from any SymmetricallyEncrypted packet to trigger
+// MDC checks.
+type checkReader struct {
+	md *MessageDetails
+}
+
+func (cr checkReader) Read(buf []byte) (n int, err error) {
+	n, err = cr.md.LiteralData.Body.Read(buf)
+	if err == io.EOF {
+		mdcErr := cr.md.decrypted.Close()
+		if mdcErr != nil {
+			err = mdcErr
+		}
+	}
+	return
+}
+
+// signatureCheckReader wraps an io.Reader from a LiteralData packet and hashes
+// the data as it is read. When it sees an EOF from the underlying io.Reader
+// it parses and checks a trailing Signature packet and triggers any MDC checks.
+type signatureCheckReader struct {
+	packets        *packet.Reader
+	h, wrappedHash hash.Hash
+	md             *MessageDetails
+}
+
+func (scr *signatureCheckReader) Read(buf []byte) (n int, err error) {
+	n, err = scr.md.LiteralData.Body.Read(buf)
+	scr.wrappedHash.Write(buf[:n])
+	if err == io.EOF {
+		var p packet.Packet
+		p, scr.md.SignatureError = scr.packets.Next()
+		if scr.md.SignatureError != nil {
+			return
+		}
+
+		var ok bool
+		if scr.md.Signature, ok = p.(*packet.Signature); ok {
+			scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignature(scr.h, scr.md.Signature)
+		} else if scr.md.SignatureV3, ok = p.(*packet.SignatureV3); ok {
+			scr.md.SignatureError = scr.md.SignedBy.PublicKey.VerifySignatureV3(scr.h, scr.md.SignatureV3)
+		} else {
+			scr.md.SignatureError = errors.StructuralError("LiteralData not followed by Signature")
+			return
+		}
+
+		// The SymmetricallyEncrypted packet, if any, might have an
+		// unsigned hash of its own. In order to check this we need to
+		// close that Reader.
+		if scr.md.decrypted != nil {
+			mdcErr := scr.md.decrypted.Close()
+			if mdcErr != nil {
+				err = mdcErr
+			}
+		}
+	}
+	return
+}
+
+// CheckDetachedSignature takes a signed file and a detached signature and
+// returns the signer if the signature is valid. If the signer isn't known,
+// ErrUnknownIssuer is returned.
+func CheckDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, err error) {
+	var issuerKeyId uint64
+	var hashFunc crypto.Hash
+	var sigType packet.SignatureType
+	var keys []Key
+	var p packet.Packet
+
+	packets := packet.NewReader(signature)
+	for {
+		p, err = packets.Next()
+		if err == io.EOF {
+			return nil, errors.ErrUnknownIssuer
+		}
+		if err != nil {
+			return nil, err
+		}
+
+		switch sig := p.(type) {
+		case *packet.Signature:
+			if sig.IssuerKeyId == nil {
+				return nil, errors.StructuralError("signature doesn't have an issuer")
+			}
+			issuerKeyId = *sig.IssuerKeyId
+			hashFunc = sig.Hash
+			sigType = sig.SigType
+		case *packet.SignatureV3:
+			issuerKeyId = sig.IssuerKeyId
+			hashFunc = sig.Hash
+			sigType = sig.SigType
+		default:
+			return nil, errors.StructuralError("non signature packet found")
+		}
+
+		keys = keyring.KeysByIdUsage(issuerKeyId, packet.KeyFlagSign)
+		if len(keys) > 0 {
+			break
+		}
+	}
+
+	if len(keys) == 0 {
+		panic("unreachable")
+	}
+
+	h, wrappedHash, err := hashForSignature(hashFunc, sigType)
+	if err != nil {
+		return nil, err
+	}
+
+	if _, err := io.Copy(wrappedHash, signed); err != nil && err != io.EOF {
+		return nil, err
+	}
+
+	for _, key := range keys {
+		switch sig := p.(type) {
+		case *packet.Signature:
+			err = key.PublicKey.VerifySignature(h, sig)
+		case *packet.SignatureV3:
+			err = key.PublicKey.VerifySignatureV3(h, sig)
+		default:
+			panic("unreachable")
+		}
+
+		if err == nil {
+			return key.Entity, nil
+		}
+	}
+
+	return nil, err
+}
+
+// CheckArmoredDetachedSignature performs the same actions as
+// CheckDetachedSignature but expects the signature to be armored.
+func CheckArmoredDetachedSignature(keyring KeyRing, signed, signature io.Reader) (signer *Entity, err error) {
+	body, err := readArmored(signature, SignatureType)
+	if err != nil {
+		return
+	}
+
+	return CheckDetachedSignature(keyring, signed, body)
+}

vendor/golang.org/x/crypto/openpgp/s2k/s2k.go

@@ -0,0 +1,273 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package s2k implements the various OpenPGP string-to-key transforms as
+// specified in RFC 4800 section 3.7.1.
+package s2k // import "golang.org/x/crypto/openpgp/s2k"
+
+import (
+	"crypto"
+	"hash"
+	"io"
+	"strconv"
+
+	"golang.org/x/crypto/openpgp/errors"
+)
+
+// Config collects configuration parameters for s2k key-stretching
+// transformatioms. A nil *Config is valid and results in all default
+// values. Currently, Config is used only by the Serialize function in
+// this package.
+type Config struct {
+	// Hash is the default hash function to be used. If
+	// nil, SHA1 is used.
+	Hash crypto.Hash
+	// S2KCount is only used for symmetric encryption. It
+	// determines the strength of the passphrase stretching when
+	// the said passphrase is hashed to produce a key. S2KCount
+	// should be between 1024 and 65011712, inclusive. If Config
+	// is nil or S2KCount is 0, the value 65536 used. Not all
+	// values in the above range can be represented. S2KCount will
+	// be rounded up to the next representable value if it cannot
+	// be encoded exactly. When set, it is strongly encrouraged to
+	// use a value that is at least 65536. See RFC 4880 Section
+	// 3.7.1.3.
+	S2KCount int
+}
+
+func (c *Config) hash() crypto.Hash {
+	if c == nil || uint(c.Hash) == 0 {
+		// SHA1 is the historical default in this package.
+		return crypto.SHA1
+	}
+
+	return c.Hash
+}
+
+func (c *Config) encodedCount() uint8 {
+	if c == nil || c.S2KCount == 0 {
+		return 96 // The common case. Correspoding to 65536
+	}
+
+	i := c.S2KCount
+	switch {
+	// Behave like GPG. Should we make 65536 the lowest value used?
+	case i < 1024:
+		i = 1024
+	case i > 65011712:
+		i = 65011712
+	}
+
+	return encodeCount(i)
+}
+
+// encodeCount converts an iterative "count" in the range 1024 to
+// 65011712, inclusive, to an encoded count. The return value is the
+// octet that is actually stored in the GPG file. encodeCount panics
+// if i is not in the above range (encodedCount above takes care to
+// pass i in the correct range). See RFC 4880 Section 3.7.7.1.
+func encodeCount(i int) uint8 {
+	if i < 1024 || i > 65011712 {
+		panic("count arg i outside the required range")
+	}
+
+	for encoded := 0; encoded < 256; encoded++ {
+		count := decodeCount(uint8(encoded))
+		if count >= i {
+			return uint8(encoded)
+		}
+	}
+
+	return 255
+}
+
+// decodeCount returns the s2k mode 3 iterative "count" corresponding to
+// the encoded octet c.
+func decodeCount(c uint8) int {
+	return (16 + int(c&15)) << (uint32(c>>4) + 6)
+}
+
+// Simple writes to out the result of computing the Simple S2K function (RFC
+// 4880, section 3.7.1.1) using the given hash and input passphrase.
+func Simple(out []byte, h hash.Hash, in []byte) {
+	Salted(out, h, in, nil)
+}
+
+var zero [1]byte
+
+// Salted writes to out the result of computing the Salted S2K function (RFC
+// 4880, section 3.7.1.2) using the given hash, input passphrase and salt.
+func Salted(out []byte, h hash.Hash, in []byte, salt []byte) {
+	done := 0
+	var digest []byte
+
+	for i := 0; done < len(out); i++ {
+		h.Reset()
+		for j := 0; j < i; j++ {
+			h.Write(zero[:])
+		}
+		h.Write(salt)
+		h.Write(in)
+		digest = h.Sum(digest[:0])
+		n := copy(out[done:], digest)
+		done += n
+	}
+}
+
+// Iterated writes to out the result of computing the Iterated and Salted S2K
+// function (RFC 4880, section 3.7.1.3) using the given hash, input passphrase,
+// salt and iteration count.
+func Iterated(out []byte, h hash.Hash, in []byte, salt []byte, count int) {
+	combined := make([]byte, len(in)+len(salt))
+	copy(combined, salt)
+	copy(combined[len(salt):], in)
+
+	if count < len(combined) {
+		count = len(combined)
+	}
+
+	done := 0
+	var digest []byte
+	for i := 0; done < len(out); i++ {
+		h.Reset()
+		for j := 0; j < i; j++ {
+			h.Write(zero[:])
+		}
+		written := 0
+		for written < count {
+			if written+len(combined) > count {
+				todo := count - written
+				h.Write(combined[:todo])
+				written = count
+			} else {
+				h.Write(combined)
+				written += len(combined)
+			}
+		}
+		digest = h.Sum(digest[:0])
+		n := copy(out[done:], digest)
+		done += n
+	}
+}
+
+// Parse reads a binary specification for a string-to-key transformation from r
+// and returns a function which performs that transform.
+func Parse(r io.Reader) (f func(out, in []byte), err error) {
+	var buf [9]byte
+
+	_, err = io.ReadFull(r, buf[:2])
+	if err != nil {
+		return
+	}
+
+	hash, ok := HashIdToHash(buf[1])
+	if !ok {
+		return nil, errors.UnsupportedError("hash for S2K function: " + strconv.Itoa(int(buf[1])))
+	}
+	if !hash.Available() {
+		return nil, errors.UnsupportedError("hash not available: " + strconv.Itoa(int(hash)))
+	}
+	h := hash.New()
+
+	switch buf[0] {
+	case 0:
+		f := func(out, in []byte) {
+			Simple(out, h, in)
+		}
+		return f, nil
+	case 1:
+		_, err = io.ReadFull(r, buf[:8])
+		if err != nil {
+			return
+		}
+		f := func(out, in []byte) {
+			Salted(out, h, in, buf[:8])
+		}
+		return f, nil
+	case 3:
+		_, err = io.ReadFull(r, buf[:9])
+		if err != nil {
+			return
+		}
+		count := decodeCount(buf[8])
+		f := func(out, in []byte) {
+			Iterated(out, h, in, buf[:8], count)
+		}
+		return f, nil
+	}
+
+	return nil, errors.UnsupportedError("S2K function")
+}
+
+// Serialize salts and stretches the given passphrase and writes the
+// resulting key into key. It also serializes an S2K descriptor to
+// w. The key stretching can be configured with c, which may be
+// nil. In that case, sensible defaults will be used.
+func Serialize(w io.Writer, key []byte, rand io.Reader, passphrase []byte, c *Config) error {
+	var buf [11]byte
+	buf[0] = 3 /* iterated and salted */
+	buf[1], _ = HashToHashId(c.hash())
+	salt := buf[2:10]
+	if _, err := io.ReadFull(rand, salt); err != nil {
+		return err
+	}
+	encodedCount := c.encodedCount()
+	count := decodeCount(encodedCount)
+	buf[10] = encodedCount
+	if _, err := w.Write(buf[:]); err != nil {
+		return err
+	}
+
+	Iterated(key, c.hash().New(), passphrase, salt, count)
+	return nil
+}
+
+// hashToHashIdMapping contains pairs relating OpenPGP's hash identifier with
+// Go's crypto.Hash type. See RFC 4880, section 9.4.
+var hashToHashIdMapping = []struct {
+	id   byte
+	hash crypto.Hash
+	name string
+}{
+	{1, crypto.MD5, "MD5"},
+	{2, crypto.SHA1, "SHA1"},
+	{3, crypto.RIPEMD160, "RIPEMD160"},
+	{8, crypto.SHA256, "SHA256"},
+	{9, crypto.SHA384, "SHA384"},
+	{10, crypto.SHA512, "SHA512"},
+	{11, crypto.SHA224, "SHA224"},
+}
+
+// HashIdToHash returns a crypto.Hash which corresponds to the given OpenPGP
+// hash id.
+func HashIdToHash(id byte) (h crypto.Hash, ok bool) {
+	for _, m := range hashToHashIdMapping {
+		if m.id == id {
+			return m.hash, true
+		}
+	}
+	return 0, false
+}
+
+// HashIdToString returns the name of the hash function corresponding to the
+// given OpenPGP hash id.
+func HashIdToString(id byte) (name string, ok bool) {
+	for _, m := range hashToHashIdMapping {
+		if m.id == id {
+			return m.name, true
+		}
+	}
+
+	return "", false
+}
+
+// HashIdToHash returns an OpenPGP hash id which corresponds the given Hash.
+func HashToHashId(h crypto.Hash) (id byte, ok bool) {
+	for _, m := range hashToHashIdMapping {
+		if m.hash == h {
+			return m.id, true
+		}
+	}
+	return 0, false
+}

vendor/golang.org/x/crypto/openpgp/write.go

@@ -0,0 +1,378 @@
+// Copyright 2011 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package openpgp
+
+import (
+	"crypto"
+	"hash"
+	"io"
+	"strconv"
+	"time"
+
+	"golang.org/x/crypto/openpgp/armor"
+	"golang.org/x/crypto/openpgp/errors"
+	"golang.org/x/crypto/openpgp/packet"
+	"golang.org/x/crypto/openpgp/s2k"
+)
+
+// DetachSign signs message with the private key from signer (which must
+// already have been decrypted) and writes the signature to w.
+// If config is nil, sensible defaults will be used.
+func DetachSign(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error {
+	return detachSign(w, signer, message, packet.SigTypeBinary, config)
+}
+
+// ArmoredDetachSign signs message with the private key from signer (which
+// must already have been decrypted) and writes an armored signature to w.
+// If config is nil, sensible defaults will be used.
+func ArmoredDetachSign(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) (err error) {
+	return armoredDetachSign(w, signer, message, packet.SigTypeBinary, config)
+}
+
+// DetachSignText signs message (after canonicalising the line endings) with
+// the private key from signer (which must already have been decrypted) and
+// writes the signature to w.
+// If config is nil, sensible defaults will be used.
+func DetachSignText(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error {
+	return detachSign(w, signer, message, packet.SigTypeText, config)
+}
+
+// ArmoredDetachSignText signs message (after canonicalising the line endings)
+// with the private key from signer (which must already have been decrypted)
+// and writes an armored signature to w.
+// If config is nil, sensible defaults will be used.
+func ArmoredDetachSignText(w io.Writer, signer *Entity, message io.Reader, config *packet.Config) error {
+	return armoredDetachSign(w, signer, message, packet.SigTypeText, config)
+}
+
+func armoredDetachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error) {
+	out, err := armor.Encode(w, SignatureType, nil)
+	if err != nil {
+		return
+	}
+	err = detachSign(out, signer, message, sigType, config)
+	if err != nil {
+		return
+	}
+	return out.Close()
+}
+
+func detachSign(w io.Writer, signer *Entity, message io.Reader, sigType packet.SignatureType, config *packet.Config) (err error) {
+	if signer.PrivateKey == nil {
+		return errors.InvalidArgumentError("signing key doesn't have a private key")
+	}
+	if signer.PrivateKey.Encrypted {
+		return errors.InvalidArgumentError("signing key is encrypted")
+	}
+
+	sig := new(packet.Signature)
+	sig.SigType = sigType
+	sig.PubKeyAlgo = signer.PrivateKey.PubKeyAlgo
+	sig.Hash = config.Hash()
+	sig.CreationTime = config.Now()
+	sig.IssuerKeyId = &signer.PrivateKey.KeyId
+
+	h, wrappedHash, err := hashForSignature(sig.Hash, sig.SigType)
+	if err != nil {
+		return
+	}
+	io.Copy(wrappedHash, message)
+
+	err = sig.Sign(h, signer.PrivateKey, config)
+	if err != nil {
+		return
+	}
+
+	return sig.Serialize(w)
+}
+
+// FileHints contains metadata about encrypted files. This metadata is, itself,
+// encrypted.
+type FileHints struct {
+	// IsBinary can be set to hint that the contents are binary data.
+	IsBinary bool
+	// FileName hints at the name of the file that should be written. It's
+	// truncated to 255 bytes if longer. It may be empty to suggest that the
+	// file should not be written to disk. It may be equal to "_CONSOLE" to
+	// suggest the data should not be written to disk.
+	FileName string
+	// ModTime contains the modification time of the file, or the zero time if not applicable.
+	ModTime time.Time
+}
+
+// SymmetricallyEncrypt acts like gpg -c: it encrypts a file with a passphrase.
+// The resulting WriteCloser must be closed after the contents of the file have
+// been written.
+// If config is nil, sensible defaults will be used.
+func SymmetricallyEncrypt(ciphertext io.Writer, passphrase []byte, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
+	if hints == nil {
+		hints = &FileHints{}
+	}
+
+	key, err := packet.SerializeSymmetricKeyEncrypted(ciphertext, passphrase, config)
+	if err != nil {
+		return
+	}
+	w, err := packet.SerializeSymmetricallyEncrypted(ciphertext, config.Cipher(), key, config)
+	if err != nil {
+		return
+	}
+
+	literaldata := w
+	if algo := config.Compression(); algo != packet.CompressionNone {
+		var compConfig *packet.CompressionConfig
+		if config != nil {
+			compConfig = config.CompressionConfig
+		}
+		literaldata, err = packet.SerializeCompressed(w, algo, compConfig)
+		if err != nil {
+			return
+		}
+	}
+
+	var epochSeconds uint32
+	if !hints.ModTime.IsZero() {
+		epochSeconds = uint32(hints.ModTime.Unix())
+	}
+	return packet.SerializeLiteral(literaldata, hints.IsBinary, hints.FileName, epochSeconds)
+}
+
+// intersectPreferences mutates and returns a prefix of a that contains only
+// the values in the intersection of a and b. The order of a is preserved.
+func intersectPreferences(a []uint8, b []uint8) (intersection []uint8) {
+	var j int
+	for _, v := range a {
+		for _, v2 := range b {
+			if v == v2 {
+				a[j] = v
+				j++
+				break
+			}
+		}
+	}
+
+	return a[:j]
+}
+
+func hashToHashId(h crypto.Hash) uint8 {
+	v, ok := s2k.HashToHashId(h)
+	if !ok {
+		panic("tried to convert unknown hash")
+	}
+	return v
+}
+
+// Encrypt encrypts a message to a number of recipients and, optionally, signs
+// it. hints contains optional information, that is also encrypted, that aids
+// the recipients in processing the message. The resulting WriteCloser must
+// be closed after the contents of the file have been written.
+// If config is nil, sensible defaults will be used.
+func Encrypt(ciphertext io.Writer, to []*Entity, signed *Entity, hints *FileHints, config *packet.Config) (plaintext io.WriteCloser, err error) {
+	var signer *packet.PrivateKey
+	if signed != nil {
+		signKey, ok := signed.signingKey(config.Now())
+		if !ok {
+			return nil, errors.InvalidArgumentError("no valid signing keys")
+		}
+		signer = signKey.PrivateKey
+		if signer == nil {
+			return nil, errors.InvalidArgumentError("no private key in signing key")
+		}
+		if signer.Encrypted {
+			return nil, errors.InvalidArgumentError("signing key must be decrypted")
+		}
+	}
+
+	// These are the possible ciphers that we'll use for the message.
+	candidateCiphers := []uint8{
+		uint8(packet.CipherAES128),
+		uint8(packet.CipherAES256),
+		uint8(packet.CipherCAST5),
+	}
+	// These are the possible hash functions that we'll use for the signature.
+	candidateHashes := []uint8{
+		hashToHashId(crypto.SHA256),
+		hashToHashId(crypto.SHA512),
+		hashToHashId(crypto.SHA1),
+		hashToHashId(crypto.RIPEMD160),
+	}
+	// In the event that a recipient doesn't specify any supported ciphers
+	// or hash functions, these are the ones that we assume that every
+	// implementation supports.
+	defaultCiphers := candidateCiphers[len(candidateCiphers)-1:]
+	defaultHashes := candidateHashes[len(candidateHashes)-1:]
+
+	encryptKeys := make([]Key, len(to))
+	for i := range to {
+		var ok bool
+		encryptKeys[i], ok = to[i].encryptionKey(config.Now())
+		if !ok {
+			return nil, errors.InvalidArgumentError("cannot encrypt a message to key id " + strconv.FormatUint(to[i].PrimaryKey.KeyId, 16) + " because it has no encryption keys")
+		}
+
+		sig := to[i].primaryIdentity().SelfSignature
+
+		preferredSymmetric := sig.PreferredSymmetric
+		if len(preferredSymmetric) == 0 {
+			preferredSymmetric = defaultCiphers
+		}
+		preferredHashes := sig.PreferredHash
+		if len(preferredHashes) == 0 {
+			preferredHashes = defaultHashes
+		}
+		candidateCiphers = intersectPreferences(candidateCiphers, preferredSymmetric)
+		candidateHashes = intersectPreferences(candidateHashes, preferredHashes)
+	}
+
+	if len(candidateCiphers) == 0 || len(candidateHashes) == 0 {
+		return nil, errors.InvalidArgumentError("cannot encrypt because recipient set shares no common algorithms")
+	}
+
+	cipher := packet.CipherFunction(candidateCiphers[0])
+	// If the cipher specified by config is a candidate, we'll use that.
+	configuredCipher := config.Cipher()
+	for _, c := range candidateCiphers {
+		cipherFunc := packet.CipherFunction(c)
+		if cipherFunc == configuredCipher {
+			cipher = cipherFunc
+			break
+		}
+	}
+
+	var hash crypto.Hash
+	for _, hashId := range candidateHashes {
+		if h, ok := s2k.HashIdToHash(hashId); ok && h.Available() {
+			hash = h
+			break
+		}
+	}
+
+	// If the hash specified by config is a candidate, we'll use that.
+	if configuredHash := config.Hash(); configuredHash.Available() {
+		for _, hashId := range candidateHashes {
+			if h, ok := s2k.HashIdToHash(hashId); ok && h == configuredHash {
+				hash = h
+				break
+			}
+		}
+	}
+
+	if hash == 0 {
+		hashId := candidateHashes[0]
+		name, ok := s2k.HashIdToString(hashId)
+		if !ok {
+			name = "#" + strconv.Itoa(int(hashId))
+		}
+		return nil, errors.InvalidArgumentError("cannot encrypt because no candidate hash functions are compiled in. (Wanted " + name + " in this case.)")
+	}
+
+	symKey := make([]byte, cipher.KeySize())
+	if _, err := io.ReadFull(config.Random(), symKey); err != nil {
+		return nil, err
+	}
+
+	for _, key := range encryptKeys {
+		if err := packet.SerializeEncryptedKey(ciphertext, key.PublicKey, cipher, symKey, config); err != nil {
+			return nil, err
+		}
+	}
+
+	encryptedData, err := packet.SerializeSymmetricallyEncrypted(ciphertext, cipher, symKey, config)
+	if err != nil {
+		return
+	}
+
+	if signer != nil {
+		ops := &packet.OnePassSignature{
+			SigType:    packet.SigTypeBinary,
+			Hash:       hash,
+			PubKeyAlgo: signer.PubKeyAlgo,
+			KeyId:      signer.KeyId,
+			IsLast:     true,
+		}
+		if err := ops.Serialize(encryptedData); err != nil {
+			return nil, err
+		}
+	}
+
+	if hints == nil {
+		hints = &FileHints{}
+	}
+
+	w := encryptedData
+	if signer != nil {
+		// If we need to write a signature packet after the literal
+		// data then we need to stop literalData from closing
+		// encryptedData.
+		w = noOpCloser{encryptedData}
+
+	}
+	var epochSeconds uint32
+	if !hints.ModTime.IsZero() {
+		epochSeconds = uint32(hints.ModTime.Unix())
+	}
+	literalData, err := packet.SerializeLiteral(w, hints.IsBinary, hints.FileName, epochSeconds)
+	if err != nil {
+		return nil, err
+	}
+
+	if signer != nil {
+		return signatureWriter{encryptedData, literalData, hash, hash.New(), signer, config}, nil
+	}
+	return literalData, nil
+}
+
+// signatureWriter hashes the contents of a message while passing it along to
+// literalData. When closed, it closes literalData, writes a signature packet
+// to encryptedData and then also closes encryptedData.
+type signatureWriter struct {
+	encryptedData io.WriteCloser
+	literalData   io.WriteCloser
+	hashType      crypto.Hash
+	h             hash.Hash
+	signer        *packet.PrivateKey
+	config        *packet.Config
+}
+
+func (s signatureWriter) Write(data []byte) (int, error) {
+	s.h.Write(data)
+	return s.literalData.Write(data)
+}
+
+func (s signatureWriter) Close() error {
+	sig := &packet.Signature{
+		SigType:      packet.SigTypeBinary,
+		PubKeyAlgo:   s.signer.PubKeyAlgo,
+		Hash:         s.hashType,
+		CreationTime: s.config.Now(),
+		IssuerKeyId:  &s.signer.KeyId,
+	}
+
+	if err := sig.Sign(s.h, s.signer, s.config); err != nil {
+		return err
+	}
+	if err := s.literalData.Close(); err != nil {
+		return err
+	}
+	if err := sig.Serialize(s.encryptedData); err != nil {
+		return err
+	}
+	return s.encryptedData.Close()
+}
+
+// noOpCloser is like an ioutil.NopCloser, but for an io.Writer.
+// TODO: we have two of these in OpenPGP packages alone. This probably needs
+// to be promoted somewhere more common.
+type noOpCloser struct {
+	w io.Writer
+}
+
+func (c noOpCloser) Write(data []byte) (n int, err error) {
+	return c.w.Write(data)
+}
+
+func (c noOpCloser) Close() error {
+	return nil
+}

vendor/vendor.json

@@ -1157,6 +1157,12 @@
 			"revision": "d86a009f5e13f83df65d0d6cee9a2e3f1445f0da",
 			"revisionTime": "2016-11-02T13:18:01Z"
 		},
+		{
+			"checksumSHA1": "TT1rac6kpQp2vz24m5yDGUNQ/QQ=",
+			"path": "golang.org/x/crypto/cast5",
+			"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
+			"revisionTime": "2017-01-13T19:21:00Z"
+		},
 		{
 			"checksumSHA1": "dwOedwBJ1EIK9+S3t108Bx054Y8=",
 			"path": "golang.org/x/crypto/curve25519",
@@ -1181,6 +1187,42 @@
 			"revision": "ede567c8e044a5913dad1d1af3696d9da953104c",
 			"revisionTime": "2016-11-04T19:41:44Z"
 		},
+		{
+			"checksumSHA1": "IIhFTrLlmlc6lEFSitqi4aw2lw0=",
+			"path": "golang.org/x/crypto/openpgp",
+			"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
+			"revisionTime": "2017-01-13T19:21:00Z"
+		},
+		{
+			"checksumSHA1": "olOKkhrdkYQHZ0lf1orrFQPQrv4=",
+			"path": "golang.org/x/crypto/openpgp/armor",
+			"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
+			"revisionTime": "2017-01-13T19:21:00Z"
+		},
+		{
+			"checksumSHA1": "eo/KtdjieJQXH7Qy+faXFcF70ME=",
+			"path": "golang.org/x/crypto/openpgp/elgamal",
+			"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
+			"revisionTime": "2017-01-13T19:21:00Z"
+		},
+		{
+			"checksumSHA1": "rlxVSaGgqdAgwblsErxTxIfuGfg=",
+			"path": "golang.org/x/crypto/openpgp/errors",
+			"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
+			"revisionTime": "2017-01-13T19:21:00Z"
+		},
+		{
+			"checksumSHA1": "LWdaR8Q9yn6eBCcnGl0HvJRDUBE=",
+			"path": "golang.org/x/crypto/openpgp/packet",
+			"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
+			"revisionTime": "2017-01-13T19:21:00Z"
+		},
+		{
+			"checksumSHA1": "s2qT4UwvzBSkzXuiuMkowif1Olw=",
+			"path": "golang.org/x/crypto/openpgp/s2k",
+			"revision": "b8a2a83acfe6e6770b75de42d5ff4c67596675c0",
+			"revisionTime": "2017-01-13T19:21:00Z"
+		},
 		{
 			"checksumSHA1": "1MGpGDQqnUoRpv7VEcQrXOBydXE=",
 			"path": "golang.org/x/crypto/pbkdf2",