Update go-jose to v2.1.8

glide.lock

@@ -1,5 +1,5 @@
-hash: c41e5b1fbd68f04f14b6e9b2ebab8bf18b857b3dc3a5754e4adf7c1884981de7
+hash: 12d0ad2fc0df4ab221e45c1ba7821708b908033c82741e250cc46dcd445b67eb
-updated: 2018-09-05T08:40:39.486766558+02:00
+updated: 2018-09-18T23:51:30.787348994+02:00
 imports:
 - name: github.com/beevik/etree
   version: 4cd0dd976db869f817248477718071a28e978df0
@@ -108,6 +108,9 @@ imports:
   subpackages:
   - bcrypt
   - blowfish
+  - ed25519
+  - ed25519/internal/edwards25519
+  - pbkdf2
 - name: golang.org/x/net
   version: 5602c733f70afc6dcec6766be0d5034d4c4f14de
   subpackages:
@@ -168,7 +171,7 @@ imports:
 - name: gopkg.in/ldap.v2
   version: 0e7db8eb77695b5a952f0e5d78df9ab160050c73
 - name: gopkg.in/square/go-jose.v2
-  version: 8c5257b2f658f86d174ae68c6a592eaf6a9608d9
+  version: 8254d6c783765f38c8675fae4427a1fe73fbd09d
   subpackages:
   - cipher
   - json

glide.yaml

@@ -25,7 +25,7 @@ import:
 
 # Used for JOSE functionality (JWKs, JWTs, etc.).
 - package: gopkg.in/square/go-jose.v2
-  version: v2.0.0
+  version: v2.1.8
   subpackages:
   - cipher
   - json

vendor/golang.org/x/crypto/ed25519/ed25519.go

@@ -0,0 +1,181 @@
+// Copyright 2016 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 ed25519 implements the Ed25519 signature algorithm. See
+// http://ed25519.cr.yp.to/.
+//
+// These functions are also compatible with the “Ed25519” function defined in
+// https://tools.ietf.org/html/draft-irtf-cfrg-eddsa-05.
+package ed25519
+
+// This code is a port of the public domain, “ref10” implementation of ed25519
+// from SUPERCOP.
+
+import (
+	"crypto"
+	cryptorand "crypto/rand"
+	"crypto/sha512"
+	"crypto/subtle"
+	"errors"
+	"io"
+	"strconv"
+
+	"golang.org/x/crypto/ed25519/internal/edwards25519"
+)
+
+const (
+	// PublicKeySize is the size, in bytes, of public keys as used in this package.
+	PublicKeySize = 32
+	// PrivateKeySize is the size, in bytes, of private keys as used in this package.
+	PrivateKeySize = 64
+	// SignatureSize is the size, in bytes, of signatures generated and verified by this package.
+	SignatureSize = 64
+)
+
+// PublicKey is the type of Ed25519 public keys.
+type PublicKey []byte
+
+// PrivateKey is the type of Ed25519 private keys. It implements crypto.Signer.
+type PrivateKey []byte
+
+// Public returns the PublicKey corresponding to priv.
+func (priv PrivateKey) Public() crypto.PublicKey {
+	publicKey := make([]byte, PublicKeySize)
+	copy(publicKey, priv[32:])
+	return PublicKey(publicKey)
+}
+
+// Sign signs the given message with priv.
+// Ed25519 performs two passes over messages to be signed and therefore cannot
+// handle pre-hashed messages. Thus opts.HashFunc() must return zero to
+// indicate the message hasn't been hashed. This can be achieved by passing
+// crypto.Hash(0) as the value for opts.
+func (priv PrivateKey) Sign(rand io.Reader, message []byte, opts crypto.SignerOpts) (signature []byte, err error) {
+	if opts.HashFunc() != crypto.Hash(0) {
+		return nil, errors.New("ed25519: cannot sign hashed message")
+	}
+
+	return Sign(priv, message), nil
+}
+
+// GenerateKey generates a public/private key pair using entropy from rand.
+// If rand is nil, crypto/rand.Reader will be used.
+func GenerateKey(rand io.Reader) (publicKey PublicKey, privateKey PrivateKey, err error) {
+	if rand == nil {
+		rand = cryptorand.Reader
+	}
+
+	privateKey = make([]byte, PrivateKeySize)
+	publicKey = make([]byte, PublicKeySize)
+	_, err = io.ReadFull(rand, privateKey[:32])
+	if err != nil {
+		return nil, nil, err
+	}
+
+	digest := sha512.Sum512(privateKey[:32])
+	digest[0] &= 248
+	digest[31] &= 127
+	digest[31] |= 64
+
+	var A edwards25519.ExtendedGroupElement
+	var hBytes [32]byte
+	copy(hBytes[:], digest[:])
+	edwards25519.GeScalarMultBase(&A, &hBytes)
+	var publicKeyBytes [32]byte
+	A.ToBytes(&publicKeyBytes)
+
+	copy(privateKey[32:], publicKeyBytes[:])
+	copy(publicKey, publicKeyBytes[:])
+
+	return publicKey, privateKey, nil
+}
+
+// Sign signs the message with privateKey and returns a signature. It will
+// panic if len(privateKey) is not PrivateKeySize.
+func Sign(privateKey PrivateKey, message []byte) []byte {
+	if l := len(privateKey); l != PrivateKeySize {
+		panic("ed25519: bad private key length: " + strconv.Itoa(l))
+	}
+
+	h := sha512.New()
+	h.Write(privateKey[:32])
+
+	var digest1, messageDigest, hramDigest [64]byte
+	var expandedSecretKey [32]byte
+	h.Sum(digest1[:0])
+	copy(expandedSecretKey[:], digest1[:])
+	expandedSecretKey[0] &= 248
+	expandedSecretKey[31] &= 63
+	expandedSecretKey[31] |= 64
+
+	h.Reset()
+	h.Write(digest1[32:])
+	h.Write(message)
+	h.Sum(messageDigest[:0])
+
+	var messageDigestReduced [32]byte
+	edwards25519.ScReduce(&messageDigestReduced, &messageDigest)
+	var R edwards25519.ExtendedGroupElement
+	edwards25519.GeScalarMultBase(&R, &messageDigestReduced)
+
+	var encodedR [32]byte
+	R.ToBytes(&encodedR)
+
+	h.Reset()
+	h.Write(encodedR[:])
+	h.Write(privateKey[32:])
+	h.Write(message)
+	h.Sum(hramDigest[:0])
+	var hramDigestReduced [32]byte
+	edwards25519.ScReduce(&hramDigestReduced, &hramDigest)
+
+	var s [32]byte
+	edwards25519.ScMulAdd(&s, &hramDigestReduced, &expandedSecretKey, &messageDigestReduced)
+
+	signature := make([]byte, SignatureSize)
+	copy(signature[:], encodedR[:])
+	copy(signature[32:], s[:])
+
+	return signature
+}
+
+// Verify reports whether sig is a valid signature of message by publicKey. It
+// will panic if len(publicKey) is not PublicKeySize.
+func Verify(publicKey PublicKey, message, sig []byte) bool {
+	if l := len(publicKey); l != PublicKeySize {
+		panic("ed25519: bad public key length: " + strconv.Itoa(l))
+	}
+
+	if len(sig) != SignatureSize || sig[63]&224 != 0 {
+		return false
+	}
+
+	var A edwards25519.ExtendedGroupElement
+	var publicKeyBytes [32]byte
+	copy(publicKeyBytes[:], publicKey)
+	if !A.FromBytes(&publicKeyBytes) {
+		return false
+	}
+	edwards25519.FeNeg(&A.X, &A.X)
+	edwards25519.FeNeg(&A.T, &A.T)
+
+	h := sha512.New()
+	h.Write(sig[:32])
+	h.Write(publicKey[:])
+	h.Write(message)
+	var digest [64]byte
+	h.Sum(digest[:0])
+
+	var hReduced [32]byte
+	edwards25519.ScReduce(&hReduced, &digest)
+
+	var R edwards25519.ProjectiveGroupElement
+	var b [32]byte
+	copy(b[:], sig[32:])
+	edwards25519.GeDoubleScalarMultVartime(&R, &hReduced, &A, &b)
+
+	var checkR [32]byte
+	R.ToBytes(&checkR)
+	return subtle.ConstantTimeCompare(sig[:32], checkR[:]) == 1
+}

vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go

@@ -0,0 +1,77 @@
+// 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 pbkdf2 implements the key derivation function PBKDF2 as defined in RFC
+2898 / PKCS #5 v2.0.
+
+A key derivation function is useful when encrypting data based on a password
+or any other not-fully-random data. It uses a pseudorandom function to derive
+a secure encryption key based on the password.
+
+While v2.0 of the standard defines only one pseudorandom function to use,
+HMAC-SHA1, the drafted v2.1 specification allows use of all five FIPS Approved
+Hash Functions SHA-1, SHA-224, SHA-256, SHA-384 and SHA-512 for HMAC. To
+choose, you can pass the `New` functions from the different SHA packages to
+pbkdf2.Key.
+*/
+package pbkdf2 // import "golang.org/x/crypto/pbkdf2"
+
+import (
+	"crypto/hmac"
+	"hash"
+)
+
+// Key derives a key from the password, salt and iteration count, returning a
+// []byte of length keylen that can be used as cryptographic key. The key is
+// derived based on the method described as PBKDF2 with the HMAC variant using
+// the supplied hash function.
+//
+// For example, to use a HMAC-SHA-1 based PBKDF2 key derivation function, you
+// can get a derived key for e.g. AES-256 (which needs a 32-byte key) by
+// doing:
+//
+// 	dk := pbkdf2.Key([]byte("some password"), salt, 4096, 32, sha1.New)
+//
+// Remember to get a good random salt. At least 8 bytes is recommended by the
+// RFC.
+//
+// Using a higher iteration count will increase the cost of an exhaustive
+// search but will also make derivation proportionally slower.
+func Key(password, salt []byte, iter, keyLen int, h func() hash.Hash) []byte {
+	prf := hmac.New(h, password)
+	hashLen := prf.Size()
+	numBlocks := (keyLen + hashLen - 1) / hashLen
+
+	var buf [4]byte
+	dk := make([]byte, 0, numBlocks*hashLen)
+	U := make([]byte, hashLen)
+	for block := 1; block <= numBlocks; block++ {
+		// N.B.: || means concatenation, ^ means XOR
+		// for each block T_i = U_1 ^ U_2 ^ ... ^ U_iter
+		// U_1 = PRF(password, salt || uint(i))
+		prf.Reset()
+		prf.Write(salt)
+		buf[0] = byte(block >> 24)
+		buf[1] = byte(block >> 16)
+		buf[2] = byte(block >> 8)
+		buf[3] = byte(block)
+		prf.Write(buf[:4])
+		dk = prf.Sum(dk)
+		T := dk[len(dk)-hashLen:]
+		copy(U, T)
+
+		// U_n = PRF(password, U_(n-1))
+		for n := 2; n <= iter; n++ {
+			prf.Reset()
+			prf.Write(U)
+			U = U[:0]
+			U = prf.Sum(U)
+			for x := range U {
+				T[x] ^= U[x]
+			}
+		}
+	}
+	return dk[:keyLen]
+}

vendor/gopkg.in/square/go-jose.v2/asymmetric.go

@@ -28,7 +28,9 @@ import (
 	"fmt"
 	"math/big"
 
+	"golang.org/x/crypto/ed25519"
 	"gopkg.in/square/go-jose.v2/cipher"
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 // A generic RSA-based encrypter/verifier
@@ -46,6 +48,10 @@ type ecEncrypterVerifier struct {
 	publicKey *ecdsa.PublicKey
 }
 
+type edEncrypterVerifier struct {
+	publicKey ed25519.PublicKey
+}
+
 // A key generator for ECDH-ES
 type ecKeyGenerator struct {
 	size      int
@@ -58,6 +64,10 @@ type ecDecrypterSigner struct {
 	privateKey *ecdsa.PrivateKey
 }
 
+type edDecrypterSigner struct {
+	privateKey ed25519.PrivateKey
+}
+
 // newRSARecipient creates recipientKeyInfo based on the given key.
 func newRSARecipient(keyAlg KeyAlgorithm, publicKey *rsa.PublicKey) (recipientKeyInfo, error) {
 	// Verify that key management algorithm is supported by this encrypter
@@ -94,15 +104,34 @@ func newRSASigner(sigAlg SignatureAlgorithm, privateKey *rsa.PrivateKey) (recipi
 
 	return recipientSigInfo{
 		sigAlg: sigAlg,
-		publicKey: &JSONWebKey{
+		publicKey: staticPublicKey(&JSONWebKey{
-			Key: &privateKey.PublicKey,
+			Key: privateKey.Public(),
-		},
+		}),
 		signer: &rsaDecrypterSigner{
 			privateKey: privateKey,
 		},
 	}, nil
 }
 
+func newEd25519Signer(sigAlg SignatureAlgorithm, privateKey ed25519.PrivateKey) (recipientSigInfo, error) {
+	if sigAlg != EdDSA {
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	if privateKey == nil {
+		return recipientSigInfo{}, errors.New("invalid private key")
+	}
+	return recipientSigInfo{
+		sigAlg: sigAlg,
+		publicKey: staticPublicKey(&JSONWebKey{
+			Key: privateKey.Public(),
+		}),
+		signer: &edDecrypterSigner{
+			privateKey: privateKey,
+		},
+	}, nil
+}
+
 // newECDHRecipient creates recipientKeyInfo based on the given key.
 func newECDHRecipient(keyAlg KeyAlgorithm, publicKey *ecdsa.PublicKey) (recipientKeyInfo, error) {
 	// Verify that key management algorithm is supported by this encrypter
@@ -139,9 +168,9 @@ func newECDSASigner(sigAlg SignatureAlgorithm, privateKey *ecdsa.PrivateKey) (re
 
 	return recipientSigInfo{
 		sigAlg: sigAlg,
-		publicKey: &JSONWebKey{
+		publicKey: staticPublicKey(&JSONWebKey{
-			Key: &privateKey.PublicKey,
+			Key: privateKey.Public(),
-		},
+		}),
 		signer: &ecDecrypterSigner{
 			privateKey: privateKey,
 		},
@@ -178,7 +207,7 @@ func (ctx rsaEncrypterVerifier) encrypt(cek []byte, alg KeyAlgorithm) ([]byte, e
 
 // Decrypt the given payload and return the content encryption key.
 func (ctx rsaDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
-	return ctx.decrypt(recipient.encryptedKey, KeyAlgorithm(headers.Alg), generator)
+	return ctx.decrypt(recipient.encryptedKey, headers.getAlgorithm(), generator)
 }
 
 // Decrypt the given payload. Based on the key encryption algorithm,
@@ -366,10 +395,15 @@ func (ctx ecKeyGenerator) genKey() ([]byte, rawHeader, error) {
 
 	out := josecipher.DeriveECDHES(ctx.algID, []byte{}, []byte{}, priv, ctx.publicKey, ctx.size)
 
+	b, err := json.Marshal(&JSONWebKey{
+		Key: &priv.PublicKey,
+	})
+	if err != nil {
+		return nil, nil, err
+	}
+
 	headers := rawHeader{
-		Epk: &JSONWebKey{
+		headerEPK: makeRawMessage(b),
-			Key: &priv.PublicKey,
-		},
 	}
 
 	return out, headers, nil
@@ -377,11 +411,15 @@ func (ctx ecKeyGenerator) genKey() ([]byte, rawHeader, error) {
 
 // Decrypt the given payload and return the content encryption key.
 func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
-	if headers.Epk == nil {
+	epk, err := headers.getEPK()
+	if err != nil {
+		return nil, errors.New("square/go-jose: invalid epk header")
+	}
+	if epk == nil {
 		return nil, errors.New("square/go-jose: missing epk header")
 	}
 
-	publicKey, ok := headers.Epk.Key.(*ecdsa.PublicKey)
+	publicKey, ok := epk.Key.(*ecdsa.PublicKey)
 	if publicKey == nil || !ok {
 		return nil, errors.New("square/go-jose: invalid epk header")
 	}
@@ -390,19 +428,26 @@ func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientI
 		return nil, errors.New("square/go-jose: invalid public key in epk header")
 	}
 
-	apuData := headers.Apu.bytes()
+	apuData, err := headers.getAPU()
-	apvData := headers.Apv.bytes()
+	if err != nil {
+		return nil, errors.New("square/go-jose: invalid apu header")
+	}
+	apvData, err := headers.getAPV()
+	if err != nil {
+		return nil, errors.New("square/go-jose: invalid apv header")
+	}
 
 	deriveKey := func(algID string, size int) []byte {
-		return josecipher.DeriveECDHES(algID, apuData, apvData, ctx.privateKey, publicKey, size)
+		return josecipher.DeriveECDHES(algID, apuData.bytes(), apvData.bytes(), ctx.privateKey, publicKey, size)
 	}
 
 	var keySize int
 
-	switch KeyAlgorithm(headers.Alg) {
+	algorithm := headers.getAlgorithm()
+	switch algorithm {
 	case ECDH_ES:
 		// ECDH-ES uses direct key agreement, no key unwrapping necessary.
-		return deriveKey(string(headers.Enc), generator.keySize()), nil
+		return deriveKey(string(headers.getEncryption()), generator.keySize()), nil
 	case ECDH_ES_A128KW:
 		keySize = 16
 	case ECDH_ES_A192KW:
@@ -413,7 +458,7 @@ func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientI
 		return nil, ErrUnsupportedAlgorithm
 	}
 
-	key := deriveKey(headers.Alg, keySize)
+	key := deriveKey(string(algorithm), keySize)
 	block, err := aes.NewCipher(key)
 	if err != nil {
 		return nil, err
@@ -422,6 +467,33 @@ func (ctx ecDecrypterSigner) decryptKey(headers rawHeader, recipient *recipientI
 	return josecipher.KeyUnwrap(block, recipient.encryptedKey)
 }
 
+func (ctx edDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	if alg != EdDSA {
+		return Signature{}, ErrUnsupportedAlgorithm
+	}
+
+	sig, err := ctx.privateKey.Sign(randReader, payload, crypto.Hash(0))
+	if err != nil {
+		return Signature{}, err
+	}
+
+	return Signature{
+		Signature: sig,
+		protected: &rawHeader{},
+	}, nil
+}
+
+func (ctx edEncrypterVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
+	if alg != EdDSA {
+		return ErrUnsupportedAlgorithm
+	}
+	ok := ed25519.Verify(ctx.publicKey, payload, signature)
+	if !ok {
+		return errors.New("square/go-jose: ed25519 signature failed to verify")
+	}
+	return nil
+}
+
 // Sign the given payload
 func (ctx ecDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
 	var expectedBitSize int
@@ -460,7 +532,7 @@ func (ctx ecDecrypterSigner) signPayload(payload []byte, alg SignatureAlgorithm)
 		keyBytes++
 	}
 
-	// We serialize the outpus (r and s) into big-endian byte arrays and pad
+	// We serialize the outputs (r and s) into big-endian byte arrays and pad
 	// them with zeros on the left to make sure the sizes work out. Both arrays
 	// must be keyBytes long, and the output must be 2*keyBytes long.
 	rBytes := r.Bytes()

vendor/gopkg.in/square/go-jose.v2/cipher/ecdh_es.go

@@ -28,7 +28,7 @@ import (
 // size may be at most 1<<16 bytes (64 KiB).
 func DeriveECDHES(alg string, apuData, apvData []byte, priv *ecdsa.PrivateKey, pub *ecdsa.PublicKey, size int) []byte {
 	if size > 1<<16 {
-		panic("ECDH-ES output size too large, must be less than 1<<16")
+		panic("ECDH-ES output size too large, must be less than or equal to 1<<16")
 	}
 
 	// algId, partyUInfo, partyVInfo inputs must be prefixed with the length

vendor/gopkg.in/square/go-jose.v2/crypter.go

@@ -22,12 +22,15 @@ import (
 	"errors"
 	"fmt"
 	"reflect"
+
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 // Encrypter represents an encrypter which produces an encrypted JWE object.
 type Encrypter interface {
 	Encrypt(plaintext []byte) (*JSONWebEncryption, error)
 	EncryptWithAuthData(plaintext []byte, aad []byte) (*JSONWebEncryption, error)
+	Options() EncrypterOptions
 }
 
 // A generic content cipher
@@ -60,6 +63,7 @@ type genericEncrypter struct {
 	cipher         contentCipher
 	recipients     []recipientKeyInfo
 	keyGenerator   keyGenerator
+	extraHeaders   map[HeaderKey]interface{}
 }
 
 type recipientKeyInfo struct {
@@ -71,13 +75,47 @@ type recipientKeyInfo struct {
 // EncrypterOptions represents options that can be set on new encrypters.
 type EncrypterOptions struct {
 	Compression CompressionAlgorithm
+
+	// Optional map of additional keys to be inserted into the protected header
+	// of a JWS object. Some specifications which make use of JWS like to insert
+	// additional values here. All values must be JSON-serializable.
+	ExtraHeaders map[HeaderKey]interface{}
+}
+
+// WithHeader adds an arbitrary value to the ExtraHeaders map, initializing it
+// if necessary. It returns itself and so can be used in a fluent style.
+func (eo *EncrypterOptions) WithHeader(k HeaderKey, v interface{}) *EncrypterOptions {
+	if eo.ExtraHeaders == nil {
+		eo.ExtraHeaders = map[HeaderKey]interface{}{}
+	}
+	eo.ExtraHeaders[k] = v
+	return eo
+}
+
+// WithContentType adds a content type ("cty") header and returns the updated
+// EncrypterOptions.
+func (eo *EncrypterOptions) WithContentType(contentType ContentType) *EncrypterOptions {
+	return eo.WithHeader(HeaderContentType, contentType)
+}
+
+// WithType adds a type ("typ") header and returns the updated EncrypterOptions.
+func (eo *EncrypterOptions) WithType(typ ContentType) *EncrypterOptions {
+	return eo.WithHeader(HeaderType, typ)
 }
 
 // Recipient represents an algorithm/key to encrypt messages to.
+//
+// PBES2Count and PBES2Salt correspond with the  "p2c" and "p2s" headers used
+// on the password-based encryption algorithms PBES2-HS256+A128KW,
+// PBES2-HS384+A192KW, and PBES2-HS512+A256KW. If they are not provided a safe
+// default of 100000 will be used for the count and a 128-bit random salt will
+// be generated.
 type Recipient struct {
-	Algorithm KeyAlgorithm
+	Algorithm  KeyAlgorithm
-	Key       interface{}
+	Key        interface{}
-	KeyID     string
+	KeyID      string
+	PBES2Count int
+	PBES2Salt  []byte
 }
 
 // NewEncrypter creates an appropriate encrypter based on the key type
@@ -89,6 +127,7 @@ func NewEncrypter(enc ContentEncryption, rcpt Recipient, opts *EncrypterOptions)
 	}
 	if opts != nil {
 		encrypter.compressionAlg = opts.Compression
+		encrypter.extraHeaders = opts.ExtraHeaders
 	}
 
 	if encrypter.cipher == nil {
@@ -98,9 +137,10 @@ func NewEncrypter(enc ContentEncryption, rcpt Recipient, opts *EncrypterOptions)
 	var keyID string
 	var rawKey interface{}
 	switch encryptionKey := rcpt.Key.(type) {
+	case JSONWebKey:
+		keyID, rawKey = encryptionKey.KeyID, encryptionKey.Key
 	case *JSONWebKey:
-		keyID = encryptionKey.KeyID
+		keyID, rawKey = encryptionKey.KeyID, encryptionKey.Key
-		rawKey = encryptionKey.Key
 	default:
 		rawKey = encryptionKey
 	}
@@ -196,6 +236,14 @@ func (ctx *genericEncrypter) addRecipient(recipient Recipient) (err error) {
 		recipientInfo.keyID = recipient.KeyID
 	}
 
+	switch recipient.Algorithm {
+	case PBES2_HS256_A128KW, PBES2_HS384_A192KW, PBES2_HS512_A256KW:
+		if sr, ok := recipientInfo.keyEncrypter.(*symmetricKeyCipher); ok {
+			sr.p2c = recipient.PBES2Count
+			sr.p2s = recipient.PBES2Salt
+		}
+	}
+
 	if err == nil {
 		ctx.recipients = append(ctx.recipients, recipientInfo)
 	}
@@ -210,6 +258,8 @@ func makeJWERecipient(alg KeyAlgorithm, encryptionKey interface{}) (recipientKey
 		return newECDHRecipient(alg, encryptionKey)
 	case []byte:
 		return newSymmetricRecipient(alg, encryptionKey)
+	case string:
+		return newSymmetricRecipient(alg, []byte(encryptionKey))
 	case *JSONWebKey:
 		recipient, err := makeJWERecipient(alg, encryptionKey.Key)
 		recipient.keyID = encryptionKey.KeyID
@@ -234,6 +284,12 @@ func newDecrypter(decryptionKey interface{}) (keyDecrypter, error) {
 		return &symmetricKeyCipher{
 			key: decryptionKey,
 		}, nil
+	case string:
+		return &symmetricKeyCipher{
+			key: []byte(decryptionKey),
+		}, nil
+	case JSONWebKey:
+		return newDecrypter(decryptionKey.Key)
 	case *JSONWebKey:
 		return newDecrypter(decryptionKey.Key)
 	default:
@@ -251,9 +307,12 @@ func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JSONWe
 	obj := &JSONWebEncryption{}
 	obj.aad = aad
 
-	obj.protected = &rawHeader{
+	obj.protected = &rawHeader{}
-		Enc: ctx.contentAlg,
+	err := obj.protected.set(headerEncryption, ctx.contentAlg)
+	if err != nil {
+		return nil, err
 	}
+
 	obj.recipients = make([]recipientInfo, len(ctx.recipients))
 
 	if len(ctx.recipients) == 0 {
@@ -273,9 +332,16 @@ func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JSONWe
 			return nil, err
 		}
 
-		recipient.header.Alg = string(info.keyAlg)
+		err = recipient.header.set(headerAlgorithm, info.keyAlg)
+		if err != nil {
+			return nil, err
+		}
+
 		if info.keyID != "" {
-			recipient.header.Kid = info.keyID
+			err = recipient.header.set(headerKeyID, info.keyID)
+			if err != nil {
+				return nil, err
+			}
 		}
 		obj.recipients[i] = recipient
 	}
@@ -293,7 +359,18 @@ func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JSONWe
 			return nil, err
 		}
 
-		obj.protected.Zip = ctx.compressionAlg
+		err = obj.protected.set(headerCompression, ctx.compressionAlg)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	for k, v := range ctx.extraHeaders {
+		b, err := json.Marshal(v)
+		if err != nil {
+			return nil, err
+		}
+		(*obj.protected)[k] = makeRawMessage(b)
 	}
 
 	authData := obj.computeAuthData()
@@ -309,6 +386,13 @@ func (ctx *genericEncrypter) EncryptWithAuthData(plaintext, aad []byte) (*JSONWe
 	return obj, nil
 }
 
+func (ctx *genericEncrypter) Options() EncrypterOptions {
+	return EncrypterOptions{
+		Compression:  ctx.compressionAlg,
+		ExtraHeaders: ctx.extraHeaders,
+	}
+}
+
 // Decrypt and validate the object and return the plaintext. Note that this
 // function does not support multi-recipient, if you desire multi-recipient
 // decryption use DecryptMulti instead.
@@ -319,7 +403,12 @@ func (obj JSONWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error)
 		return nil, errors.New("square/go-jose: too many recipients in payload; expecting only one")
 	}
 
-	if len(headers.Crit) > 0 {
+	critical, err := headers.getCritical()
+	if err != nil {
+		return nil, fmt.Errorf("square/go-jose: invalid crit header")
+	}
+
+	if len(critical) > 0 {
 		return nil, fmt.Errorf("square/go-jose: unsupported crit header")
 	}
 
@@ -328,9 +417,9 @@ func (obj JSONWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error)
 		return nil, err
 	}
 
-	cipher := getContentCipher(headers.Enc)
+	cipher := getContentCipher(headers.getEncryption())
 	if cipher == nil {
-		return nil, fmt.Errorf("square/go-jose: unsupported enc value '%s'", string(headers.Enc))
+		return nil, fmt.Errorf("square/go-jose: unsupported enc value '%s'", string(headers.getEncryption()))
 	}
 
 	generator := randomKeyGenerator{
@@ -360,8 +449,8 @@ func (obj JSONWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error)
 	}
 
 	// The "zip" header parameter may only be present in the protected header.
-	if obj.protected.Zip != "" {
+	if comp := obj.protected.getCompression(); comp != "" {
-		plaintext, err = decompress(obj.protected.Zip, plaintext)
+		plaintext, err = decompress(comp, plaintext)
 	}
 
 	return plaintext, err
@@ -374,7 +463,12 @@ func (obj JSONWebEncryption) Decrypt(decryptionKey interface{}) ([]byte, error)
 func (obj JSONWebEncryption) DecryptMulti(decryptionKey interface{}) (int, Header, []byte, error) {
 	globalHeaders := obj.mergedHeaders(nil)
 
-	if len(globalHeaders.Crit) > 0 {
+	critical, err := globalHeaders.getCritical()
+	if err != nil {
+		return -1, Header{}, nil, fmt.Errorf("square/go-jose: invalid crit header")
+	}
+
+	if len(critical) > 0 {
 		return -1, Header{}, nil, fmt.Errorf("square/go-jose: unsupported crit header")
 	}
 
@@ -383,9 +477,10 @@ func (obj JSONWebEncryption) DecryptMulti(decryptionKey interface{}) (int, Heade
 		return -1, Header{}, nil, err
 	}
 
-	cipher := getContentCipher(globalHeaders.Enc)
+	encryption := globalHeaders.getEncryption()
+	cipher := getContentCipher(encryption)
 	if cipher == nil {
-		return -1, Header{}, nil, fmt.Errorf("square/go-jose: unsupported enc value '%s'", string(globalHeaders.Enc))
+		return -1, Header{}, nil, fmt.Errorf("square/go-jose: unsupported enc value '%s'", string(encryption))
 	}
 
 	generator := randomKeyGenerator{
@@ -424,9 +519,14 @@ func (obj JSONWebEncryption) DecryptMulti(decryptionKey interface{}) (int, Heade
 	}
 
 	// The "zip" header parameter may only be present in the protected header.
-	if obj.protected.Zip != "" {
+	if comp := obj.protected.getCompression(); comp != "" {
-		plaintext, err = decompress(obj.protected.Zip, plaintext)
+		plaintext, err = decompress(comp, plaintext)
 	}
 
-	return index, headers.sanitized(), plaintext, err
+	sanitized, err := headers.sanitized()
+	if err != nil {
+		return -1, Header{}, nil, fmt.Errorf("square/go-jose: failed to sanitize header: %v", err)
+	}
+
+	return index, sanitized, plaintext, err
 }

vendor/gopkg.in/square/go-jose.v2/doc.go

@@ -17,10 +17,11 @@
 /*
 
 Package jose aims to provide an implementation of the Javascript Object Signing
-and Encryption set of standards. For the moment, it mainly focuses on
+and Encryption set of standards. It implements encryption and signing based on
-encryption and signing based on the JSON Web Encryption and JSON Web Signature
+the JSON Web Encryption and JSON Web Signature standards, with optional JSON
-standards.  The library supports both the compact and full serialization
+Web Token support available in a sub-package. The library supports both the
-formats, and has optional support for multiple recipients.
+compact and full serialization formats, and has optional support for multiple
+recipients.
 
 */
 package jose

vendor/gopkg.in/square/go-jose.v2/encoding.go

@@ -21,10 +21,11 @@ import (
 	"compress/flate"
 	"encoding/base64"
 	"encoding/binary"
-	"encoding/json"
 	"io"
 	"math/big"
 	"regexp"
+
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 var stripWhitespaceRegex = regexp.MustCompile("\\s")

vendor/gopkg.in/square/go-jose.v2/jwe.go

@@ -18,9 +18,10 @@ package jose
 
 import (
 	"encoding/base64"
-	"encoding/json"
 	"fmt"
 	"strings"
+
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 // rawJSONWebEncryption represents a raw JWE JSON object. Used for parsing/serializing.
@@ -85,10 +86,12 @@ func (obj JSONWebEncryption) mergedHeaders(recipient *recipientInfo) rawHeader {
 func (obj JSONWebEncryption) computeAuthData() []byte {
 	var protected string
 
-	if obj.original != nil {
+	if obj.original != nil && obj.original.Protected != nil {
 		protected = obj.original.Protected.base64()
-	} else {
+	} else if obj.protected != nil {
 		protected = base64.RawURLEncoding.EncodeToString(mustSerializeJSON((obj.protected)))
+	} else {
+		protected = ""
 	}
 
 	output := []byte(protected)
@@ -129,9 +132,15 @@ func (parsed *rawJSONWebEncryption) sanitized() (*JSONWebEncryption, error) {
 	}
 
 	// Check that there is not a nonce in the unprotected headers
-	if (parsed.Unprotected != nil && parsed.Unprotected.Nonce != "") ||
+	if parsed.Unprotected != nil {
-		(parsed.Header != nil && parsed.Header.Nonce != "") {
+		if nonce := parsed.Unprotected.getNonce(); nonce != "" {
-		return nil, ErrUnprotectedNonce
+			return nil, ErrUnprotectedNonce
+		}
+	}
+	if parsed.Header != nil {
+		if nonce := parsed.Header.getNonce(); nonce != "" {
+			return nil, ErrUnprotectedNonce
+		}
 	}
 
 	if parsed.Protected != nil && len(parsed.Protected.bytes()) > 0 {
@@ -143,7 +152,12 @@ func (parsed *rawJSONWebEncryption) sanitized() (*JSONWebEncryption, error) {
 
 	// Note: this must be called _after_ we parse the protected header,
 	// otherwise fields from the protected header will not get picked up.
-	obj.Header = obj.mergedHeaders(nil).sanitized()
+	var err error
+	mergedHeaders := obj.mergedHeaders(nil)
+	obj.Header, err = mergedHeaders.sanitized()
+	if err != nil {
+		return nil, fmt.Errorf("square/go-jose: cannot sanitize merged headers: %v (%v)", err, mergedHeaders)
+	}
 
 	if len(parsed.Recipients) == 0 {
 		obj.recipients = []recipientInfo{
@@ -161,7 +175,7 @@ func (parsed *rawJSONWebEncryption) sanitized() (*JSONWebEncryption, error) {
 			}
 
 			// Check that there is not a nonce in the unprotected header
-			if parsed.Recipients[r].Header != nil && parsed.Recipients[r].Header.Nonce != "" {
+			if parsed.Recipients[r].Header != nil && parsed.Recipients[r].Header.getNonce() != "" {
 				return nil, ErrUnprotectedNonce
 			}
 
@@ -172,7 +186,7 @@ func (parsed *rawJSONWebEncryption) sanitized() (*JSONWebEncryption, error) {
 
 	for _, recipient := range obj.recipients {
 		headers := obj.mergedHeaders(&recipient)
-		if headers.Alg == "" || headers.Enc == "" {
+		if headers.getAlgorithm() == "" || headers.getEncryption() == "" {
 			return nil, fmt.Errorf("square/go-jose: message is missing alg/enc headers")
 		}
 	}

vendor/gopkg.in/square/go-jose.v2/jwk.go

@@ -29,6 +29,8 @@ import (
 	"reflect"
 	"strings"
 
+	"golang.org/x/crypto/ed25519"
+
 	"gopkg.in/square/go-jose.v2/json"
 )
 
@@ -73,10 +75,14 @@ func (k JSONWebKey) MarshalJSON() ([]byte, error) {
 	var err error
 
 	switch key := k.Key.(type) {
+	case ed25519.PublicKey:
+		raw = fromEdPublicKey(key)
 	case *ecdsa.PublicKey:
 		raw, err = fromEcPublicKey(key)
 	case *rsa.PublicKey:
 		raw = fromRsaPublicKey(key)
+	case ed25519.PrivateKey:
+		raw, err = fromEdPrivateKey(key)
 	case *ecdsa.PrivateKey:
 		raw, err = fromEcPrivateKey(key)
 	case *rsa.PrivateKey:
@@ -126,23 +132,26 @@ func (k *JSONWebKey) UnmarshalJSON(data []byte) (err error) {
 		}
 	case "oct":
 		key, err = raw.symmetricKey()
+	case "OKP":
+		if raw.Crv == "Ed25519" && raw.X != nil {
+			if raw.D != nil {
+				key, err = raw.edPrivateKey()
+			} else {
+				key, err = raw.edPublicKey()
+			}
+		} else {
+			err = fmt.Errorf("square/go-jose: unknown curve %s'", raw.Crv)
+		}
 	default:
 		err = fmt.Errorf("square/go-jose: unknown json web key type '%s'", raw.Kty)
 	}
 
 	if err == nil {
 		*k = JSONWebKey{Key: key, KeyID: raw.Kid, Algorithm: raw.Alg, Use: raw.Use}
-	}
 
-	k.Certificates = make([]*x509.Certificate, len(raw.X5c))
+		k.Certificates, err = parseCertificateChain(raw.X5c)
-	for i, cert := range raw.X5c {
-		raw, err := base64.StdEncoding.DecodeString(cert)
 		if err != nil {
-			return err
+			return fmt.Errorf("failed to unmarshal x5c field: %s", err)
-		}
-		k.Certificates[i], err = x509.ParseCertificate(raw)
-		if err != nil {
-			return err
 		}
 	}
 
@@ -171,6 +180,7 @@ func (s *JSONWebKeySet) Key(kid string) []JSONWebKey {
 
 const rsaThumbprintTemplate = `{"e":"%s","kty":"RSA","n":"%s"}`
 const ecThumbprintTemplate = `{"crv":"%s","kty":"EC","x":"%s","y":"%s"}`
+const edThumbprintTemplate = `{"crv":"%s","kty":"OKP",x":"%s"}`
 
 func ecThumbprintInput(curve elliptic.Curve, x, y *big.Int) (string, error) {
 	coordLength := curveSize(curve)
@@ -179,6 +189,10 @@ func ecThumbprintInput(curve elliptic.Curve, x, y *big.Int) (string, error) {
 		return "", err
 	}
 
+	if len(x.Bytes()) > coordLength || len(y.Bytes()) > coordLength {
+		return "", errors.New("square/go-jose: invalid elliptic key (too large)")
+	}
+
 	return fmt.Sprintf(ecThumbprintTemplate, crv,
 		newFixedSizeBuffer(x.Bytes(), coordLength).base64(),
 		newFixedSizeBuffer(y.Bytes(), coordLength).base64()), nil
@@ -190,12 +204,23 @@ func rsaThumbprintInput(n *big.Int, e int) (string, error) {
 		newBuffer(n.Bytes()).base64()), nil
 }
 
+func edThumbprintInput(ed ed25519.PublicKey) (string, error) {
+	crv := "Ed25519"
+	if len(ed) > 32 {
+		return "", errors.New("square/go-jose: invalid elliptic key (too large)")
+	}
+	return fmt.Sprintf(edThumbprintTemplate, crv,
+		newFixedSizeBuffer(ed, 32).base64()), nil
+}
+
 // Thumbprint computes the JWK Thumbprint of a key using the
 // indicated hash algorithm.
 func (k *JSONWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
 	var input string
 	var err error
 	switch key := k.Key.(type) {
+	case ed25519.PublicKey:
+		input, err = edThumbprintInput(key)
 	case *ecdsa.PublicKey:
 		input, err = ecThumbprintInput(key.Curve, key.X, key.Y)
 	case *ecdsa.PrivateKey:
@@ -204,6 +229,8 @@ func (k *JSONWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
 		input, err = rsaThumbprintInput(key.N, key.E)
 	case *rsa.PrivateKey:
 		input, err = rsaThumbprintInput(key.N, key.E)
+	case ed25519.PrivateKey:
+		input, err = edThumbprintInput(ed25519.PublicKey(key[0:32]))
 	default:
 		return nil, fmt.Errorf("square/go-jose: unknown key type '%s'", reflect.TypeOf(key))
 	}
@@ -220,13 +247,32 @@ func (k *JSONWebKey) Thumbprint(hash crypto.Hash) ([]byte, error) {
 // IsPublic returns true if the JWK represents a public key (not symmetric, not private).
 func (k *JSONWebKey) IsPublic() bool {
 	switch k.Key.(type) {
-	case *ecdsa.PublicKey, *rsa.PublicKey:
+	case *ecdsa.PublicKey, *rsa.PublicKey, ed25519.PublicKey:
 		return true
 	default:
 		return false
 	}
 }
 
+// Public creates JSONWebKey with corresponding publik key if JWK represents asymmetric private key.
+func (k *JSONWebKey) Public() JSONWebKey {
+	if k.IsPublic() {
+		return *k
+	}
+	ret := *k
+	switch key := k.Key.(type) {
+	case *ecdsa.PrivateKey:
+		ret.Key = key.Public()
+	case *rsa.PrivateKey:
+		ret.Key = key.Public()
+	case ed25519.PrivateKey:
+		ret.Key = key.Public()
+	default:
+		return JSONWebKey{} // returning invalid key
+	}
+	return ret
+}
+
 // Valid checks that the key contains the expected parameters.
 func (k *JSONWebKey) Valid() bool {
 	if k.Key == nil {
@@ -249,6 +295,14 @@ func (k *JSONWebKey) Valid() bool {
 		if key.N == nil || key.E == 0 || key.D == nil || len(key.Primes) < 2 {
 			return false
 		}
+	case ed25519.PublicKey:
+		if len(key) != 32 {
+			return false
+		}
+	case ed25519.PrivateKey:
+		if len(key) != 64 {
+			return false
+		}
 	default:
 		return false
 	}
@@ -266,6 +320,14 @@ func (key rawJSONWebKey) rsaPublicKey() (*rsa.PublicKey, error) {
 	}, nil
 }
 
+func fromEdPublicKey(pub ed25519.PublicKey) *rawJSONWebKey {
+	return &rawJSONWebKey{
+		Kty: "OKP",
+		Crv: "Ed25519",
+		X:   newBuffer(pub),
+	}
+}
+
 func fromRsaPublicKey(pub *rsa.PublicKey) *rawJSONWebKey {
 	return &rawJSONWebKey{
 		Kty: "RSA",
@@ -334,6 +396,36 @@ func fromEcPublicKey(pub *ecdsa.PublicKey) (*rawJSONWebKey, error) {
 	return key, nil
 }
 
+func (key rawJSONWebKey) edPrivateKey() (ed25519.PrivateKey, error) {
+	var missing []string
+	switch {
+	case key.D == nil:
+		missing = append(missing, "D")
+	case key.X == nil:
+		missing = append(missing, "X")
+	}
+
+	if len(missing) > 0 {
+		return nil, fmt.Errorf("square/go-jose: invalid Ed25519 private key, missing %s value(s)", strings.Join(missing, ", "))
+	}
+
+	privateKey := make([]byte, ed25519.PrivateKeySize)
+	copy(privateKey[0:32], key.X.bytes())
+	copy(privateKey[32:], key.D.bytes())
+	rv := ed25519.PrivateKey(privateKey)
+	return rv, nil
+}
+
+func (key rawJSONWebKey) edPublicKey() (ed25519.PublicKey, error) {
+	if key.X == nil {
+		return nil, fmt.Errorf("square/go-jose: invalid Ed key, missing x value")
+	}
+	publicKey := make([]byte, ed25519.PublicKeySize)
+	copy(publicKey[0:32], key.X.bytes())
+	rv := ed25519.PublicKey(publicKey)
+	return rv, nil
+}
+
 func (key rawJSONWebKey) rsaPrivateKey() (*rsa.PrivateKey, error) {
 	var missing []string
 	switch {
@@ -379,6 +471,13 @@ func (key rawJSONWebKey) rsaPrivateKey() (*rsa.PrivateKey, error) {
 	return rv, err
 }
 
+func fromEdPrivateKey(ed ed25519.PrivateKey) (*rawJSONWebKey, error) {
+	raw := fromEdPublicKey(ed25519.PublicKey(ed[0:32]))
+
+	raw.D = newBuffer(ed[32:])
+	return raw, nil
+}
+
 func fromRsaPrivateKey(rsa *rsa.PrivateKey) (*rawJSONWebKey, error) {
 	if len(rsa.Primes) != 2 {
 		return nil, ErrUnsupportedKeyType

vendor/gopkg.in/square/go-jose.v2/jws.go

@@ -52,9 +52,20 @@ type JSONWebSignature struct {
 
 // Signature represents a single signature over the JWS payload and protected header.
 type Signature struct {
-	// Header fields, such as the signature algorithm
+	// Merged header fields. Contains both protected and unprotected header
+	// values. Prefer using Protected and Unprotected fields instead of this.
+	// Values in this header may or may not have been signed and in general
+	// should not be trusted.
 	Header Header
 
+	// Protected header. Values in this header were signed and
+	// will be verified as part of the signature verification process.
+	Protected Header
+
+	// Unprotected header. Values in this header were not signed
+	// and in general should not be trusted.
+	Unprotected Header
+
 	// The actual signature value
 	Signature []byte
 
@@ -82,7 +93,7 @@ func (sig Signature) mergedHeaders() rawHeader {
 }
 
 // Compute data to be signed
-func (obj JSONWebSignature) computeAuthData(signature *Signature) []byte {
+func (obj JSONWebSignature) computeAuthData(payload []byte, signature *Signature) []byte {
 	var serializedProtected string
 
 	if signature.original != nil && signature.original.Protected != nil {
@@ -95,7 +106,7 @@ func (obj JSONWebSignature) computeAuthData(signature *Signature) []byte {
 
 	return []byte(fmt.Sprintf("%s.%s",
 		serializedProtected,
-		base64.RawURLEncoding.EncodeToString(obj.payload)))
+		base64.RawURLEncoding.EncodeToString(payload)))
 }
 
 // parseSignedFull parses a message in full format.
@@ -132,7 +143,7 @@ func (parsed *rawJSONWebSignature) sanitized() (*JSONWebSignature, error) {
 		}
 
 		// Check that there is not a nonce in the unprotected header
-		if parsed.Header != nil && parsed.Header.Nonce != "" {
+		if parsed.Header != nil && parsed.Header.getNonce() != "" {
 			return nil, ErrUnprotectedNonce
 		}
 
@@ -153,7 +164,25 @@ func (parsed *rawJSONWebSignature) sanitized() (*JSONWebSignature, error) {
 			Signature: parsed.Signature,
 		}
 
-		signature.Header = signature.mergedHeaders().sanitized()
+		var err error
+		signature.Header, err = signature.mergedHeaders().sanitized()
+		if err != nil {
+			return nil, err
+		}
+
+		if signature.header != nil {
+			signature.Unprotected, err = signature.header.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		if signature.protected != nil {
+			signature.Protected, err = signature.protected.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
 
 		// As per RFC 7515 Section 4.1.3, only public keys are allowed to be embedded.
 		jwk := signature.Header.JSONWebKey
@@ -174,11 +203,30 @@ func (parsed *rawJSONWebSignature) sanitized() (*JSONWebSignature, error) {
 		}
 
 		// Check that there is not a nonce in the unprotected header
-		if sig.Header != nil && sig.Header.Nonce != "" {
+		if sig.Header != nil && sig.Header.getNonce() != "" {
 			return nil, ErrUnprotectedNonce
 		}
 
-		obj.Signatures[i].Header = obj.Signatures[i].mergedHeaders().sanitized()
+		var err error
+		obj.Signatures[i].Header, err = obj.Signatures[i].mergedHeaders().sanitized()
+		if err != nil {
+			return nil, err
+		}
+
+		if obj.Signatures[i].header != nil {
+			obj.Signatures[i].Unprotected, err = obj.Signatures[i].header.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
+		if obj.Signatures[i].protected != nil {
+			obj.Signatures[i].Protected, err = obj.Signatures[i].protected.sanitized()
+			if err != nil {
+				return nil, err
+			}
+		}
+
 		obj.Signatures[i].Signature = sig.Signature.bytes()
 
 		// As per RFC 7515 Section 4.1.3, only public keys are allowed to be embedded.

vendor/gopkg.in/square/go-jose.v2/opaque.go

@@ -0,0 +1,83 @@
+/*-
+ * Copyright 2018 Square Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package jose
+
+// OpaqueSigner is an interface that supports signing payloads with opaque
+// private key(s). Private key operations preformed by implementors may, for
+// example, occur in a hardware module. An OpaqueSigner may rotate signing keys
+// transparently to the user of this interface.
+type OpaqueSigner interface {
+	// Public returns the public key of the current signing key.
+	Public() *JSONWebKey
+	// Algs returns a list of supported signing algorithms.
+	Algs() []SignatureAlgorithm
+	// SignPayload signs a payload with the current signing key using the given
+	// algorithm.
+	SignPayload(payload []byte, alg SignatureAlgorithm) ([]byte, error)
+}
+
+type opaqueSigner struct {
+	signer OpaqueSigner
+}
+
+func newOpaqueSigner(alg SignatureAlgorithm, signer OpaqueSigner) (recipientSigInfo, error) {
+	var algSupported bool
+	for _, salg := range signer.Algs() {
+		if alg == salg {
+			algSupported = true
+			break
+		}
+	}
+	if !algSupported {
+		return recipientSigInfo{}, ErrUnsupportedAlgorithm
+	}
+
+	return recipientSigInfo{
+		sigAlg:    alg,
+		publicKey: signer.Public,
+		signer: &opaqueSigner{
+			signer: signer,
+		},
+	}, nil
+}
+
+func (o *opaqueSigner) signPayload(payload []byte, alg SignatureAlgorithm) (Signature, error) {
+	out, err := o.signer.SignPayload(payload, alg)
+	if err != nil {
+		return Signature{}, err
+	}
+
+	return Signature{
+		Signature: out,
+		protected: &rawHeader{},
+	}, nil
+}
+
+// OpaqueVerifier is an interface that supports verifying payloads with opaque
+// public key(s). An OpaqueSigner may rotate signing keys transparently to the
+// user of this interface.
+type OpaqueVerifier interface {
+	VerifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error
+}
+
+type opaqueVerifier struct {
+	verifier OpaqueVerifier
+}
+
+func (o *opaqueVerifier) verifyPayload(payload []byte, signature []byte, alg SignatureAlgorithm) error {
+	return o.verifier.VerifyPayload(payload, signature, alg)
+}

vendor/gopkg.in/square/go-jose.v2/shared.go

@@ -18,8 +18,12 @@ package jose
 
 import (
 	"crypto/elliptic"
+	"crypto/x509"
+	"encoding/base64"
 	"errors"
 	"fmt"
+
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 // KeyAlgorithm represents a key management algorithm.
@@ -34,6 +38,9 @@ type ContentEncryption string
 // CompressionAlgorithm represents an algorithm used for plaintext compression.
 type CompressionAlgorithm string
 
+// ContentType represents type of the contained data.
+type ContentType string
+
 var (
 	// ErrCryptoFailure represents an error in cryptographic primitive. This
 	// occurs when, for example, a message had an invalid authentication tag or
@@ -63,6 +70,7 @@ var (
 
 // Key management algorithms
 const (
+	ED25519            = KeyAlgorithm("ED25519")
 	RSA1_5             = KeyAlgorithm("RSA1_5")             // RSA-PKCS1v1.5
 	RSA_OAEP           = KeyAlgorithm("RSA-OAEP")           // RSA-OAEP-SHA1
 	RSA_OAEP_256       = KeyAlgorithm("RSA-OAEP-256")       // RSA-OAEP-SHA256
@@ -84,6 +92,7 @@ const (
 
 // Signature algorithms
 const (
+	EdDSA = SignatureAlgorithm("EdDSA")
 	HS256 = SignatureAlgorithm("HS256") // HMAC using SHA-256
 	HS384 = SignatureAlgorithm("HS384") // HMAC using SHA-384
 	HS512 = SignatureAlgorithm("HS512") // HMAC using SHA-512
@@ -114,21 +123,44 @@ const (
 	DEFLATE = CompressionAlgorithm("DEF") // DEFLATE (RFC 1951)
 )
 
+// A key in the protected header of a JWS object. Use of the Header...
+// constants is preferred to enhance type safety.
+type HeaderKey string
+
+const (
+	HeaderType        HeaderKey = "typ" // string
+	HeaderContentType           = "cty" // string
+
+	// These are set by go-jose and shouldn't need to be set by consumers of the
+	// library.
+	headerAlgorithm   = "alg"  // string
+	headerEncryption  = "enc"  // ContentEncryption
+	headerCompression = "zip"  // CompressionAlgorithm
+	headerCritical    = "crit" // []string
+
+	headerAPU = "apu" // *byteBuffer
+	headerAPV = "apv" // *byteBuffer
+	headerEPK = "epk" // *JSONWebKey
+	headerIV  = "iv"  // *byteBuffer
+	headerTag = "tag" // *byteBuffer
+	headerX5c = "x5c" // []*x509.Certificate
+
+	headerJWK   = "jwk"   // *JSONWebKey
+	headerKeyID = "kid"   // string
+	headerNonce = "nonce" // string
+
+	headerP2C = "p2c" // *byteBuffer (int)
+	headerP2S = "p2s" // *byteBuffer ([]byte)
+
+)
+
 // rawHeader represents the JOSE header for JWE/JWS objects (used for parsing).
-type rawHeader struct {
+//
-	Alg   string               `json:"alg,omitempty"`
+// The decoding of the constituent items is deferred because we want to marshal
-	Enc   ContentEncryption    `json:"enc,omitempty"`
+// some members into particular structs rather than generic maps, but at the
-	Zip   CompressionAlgorithm `json:"zip,omitempty"`
+// same time we need to receive any extra fields unhandled by this library to
-	Crit  []string             `json:"crit,omitempty"`
+// pass through to consuming code in case it wants to examine them.
-	Apu   *byteBuffer          `json:"apu,omitempty"`
+type rawHeader map[HeaderKey]*json.RawMessage
-	Apv   *byteBuffer          `json:"apv,omitempty"`
-	Epk   *JSONWebKey          `json:"epk,omitempty"`
-	Iv    *byteBuffer          `json:"iv,omitempty"`
-	Tag   *byteBuffer          `json:"tag,omitempty"`
-	Jwk   *JSONWebKey          `json:"jwk,omitempty"`
-	Kid   string               `json:"kid,omitempty"`
-	Nonce string               `json:"nonce,omitempty"`
-}
 
 // Header represents the read-only JOSE header for JWE/JWS objects.
 type Header struct {
@@ -136,62 +168,295 @@ type Header struct {
 	JSONWebKey *JSONWebKey
 	Algorithm  string
 	Nonce      string
+
+	// Unverified certificate chain parsed from x5c header.
+	certificates []*x509.Certificate
+
+	// Any headers not recognised above get unmarshaled
+	// from JSON in a generic manner and placed in this map.
+	ExtraHeaders map[HeaderKey]interface{}
+}
+
+// Certificates verifies & returns the certificate chain present
+// in the x5c header field of a message, if one was present. Returns
+// an error if there was no x5c header present or the chain could
+// not be validated with the given verify options.
+func (h Header) Certificates(opts x509.VerifyOptions) ([][]*x509.Certificate, error) {
+	if len(h.certificates) == 0 {
+		return nil, errors.New("square/go-jose: no x5c header present in message")
+	}
+
+	leaf := h.certificates[0]
+	if opts.Intermediates == nil {
+		opts.Intermediates = x509.NewCertPool()
+		for _, intermediate := range h.certificates[1:] {
+			opts.Intermediates.AddCert(intermediate)
+		}
+	}
+
+	return leaf.Verify(opts)
+}
+
+func (parsed rawHeader) set(k HeaderKey, v interface{}) error {
+	b, err := json.Marshal(v)
+	if err != nil {
+		return err
+	}
+
+	parsed[k] = makeRawMessage(b)
+	return nil
+}
+
+// getString gets a string from the raw JSON, defaulting to "".
+func (parsed rawHeader) getString(k HeaderKey) string {
+	v, ok := parsed[k]
+	if !ok || v == nil {
+		return ""
+	}
+	var s string
+	err := json.Unmarshal(*v, &s)
+	if err != nil {
+		return ""
+	}
+	return s
+}
+
+// getByteBuffer gets a byte buffer from the raw JSON. Returns (nil, nil) if
+// not specified.
+func (parsed rawHeader) getByteBuffer(k HeaderKey) (*byteBuffer, error) {
+	v := parsed[k]
+	if v == nil {
+		return nil, nil
+	}
+	var bb *byteBuffer
+	err := json.Unmarshal(*v, &bb)
+	if err != nil {
+		return nil, err
+	}
+	return bb, nil
+}
+
+// getAlgorithm extracts parsed "alg" from the raw JSON as a KeyAlgorithm.
+func (parsed rawHeader) getAlgorithm() KeyAlgorithm {
+	return KeyAlgorithm(parsed.getString(headerAlgorithm))
+}
+
+// getSignatureAlgorithm extracts parsed "alg" from the raw JSON as a SignatureAlgorithm.
+func (parsed rawHeader) getSignatureAlgorithm() SignatureAlgorithm {
+	return SignatureAlgorithm(parsed.getString(headerAlgorithm))
+}
+
+// getEncryption extracts parsed "enc" from the raw JSON.
+func (parsed rawHeader) getEncryption() ContentEncryption {
+	return ContentEncryption(parsed.getString(headerEncryption))
+}
+
+// getCompression extracts parsed "zip" from the raw JSON.
+func (parsed rawHeader) getCompression() CompressionAlgorithm {
+	return CompressionAlgorithm(parsed.getString(headerCompression))
+}
+
+func (parsed rawHeader) getNonce() string {
+	return parsed.getString(headerNonce)
+}
+
+// getEPK extracts parsed "epk" from the raw JSON.
+func (parsed rawHeader) getEPK() (*JSONWebKey, error) {
+	v := parsed[headerEPK]
+	if v == nil {
+		return nil, nil
+	}
+	var epk *JSONWebKey
+	err := json.Unmarshal(*v, &epk)
+	if err != nil {
+		return nil, err
+	}
+	return epk, nil
+}
+
+// getAPU extracts parsed "apu" from the raw JSON.
+func (parsed rawHeader) getAPU() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerAPU)
+}
+
+// getAPV extracts parsed "apv" from the raw JSON.
+func (parsed rawHeader) getAPV() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerAPV)
+}
+
+// getIV extracts parsed "iv" frpom the raw JSON.
+func (parsed rawHeader) getIV() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerIV)
+}
+
+// getTag extracts parsed "tag" frpom the raw JSON.
+func (parsed rawHeader) getTag() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerTag)
+}
+
+// getJWK extracts parsed "jwk" from the raw JSON.
+func (parsed rawHeader) getJWK() (*JSONWebKey, error) {
+	v := parsed[headerJWK]
+	if v == nil {
+		return nil, nil
+	}
+	var jwk *JSONWebKey
+	err := json.Unmarshal(*v, &jwk)
+	if err != nil {
+		return nil, err
+	}
+	return jwk, nil
+}
+
+// getCritical extracts parsed "crit" from the raw JSON. If omitted, it
+// returns an empty slice.
+func (parsed rawHeader) getCritical() ([]string, error) {
+	v := parsed[headerCritical]
+	if v == nil {
+		return nil, nil
+	}
+
+	var q []string
+	err := json.Unmarshal(*v, &q)
+	if err != nil {
+		return nil, err
+	}
+	return q, nil
+}
+
+// getS2C extracts parsed "p2c" from the raw JSON.
+func (parsed rawHeader) getP2C() (int, error) {
+	v := parsed[headerP2C]
+	if v == nil {
+		return 0, nil
+	}
+
+	var p2c int
+	err := json.Unmarshal(*v, &p2c)
+	if err != nil {
+		return 0, err
+	}
+	return p2c, nil
+}
+
+// getS2S extracts parsed "p2s" from the raw JSON.
+func (parsed rawHeader) getP2S() (*byteBuffer, error) {
+	return parsed.getByteBuffer(headerP2S)
 }
 
 // sanitized produces a cleaned-up header object from the raw JSON.
-func (parsed rawHeader) sanitized() Header {
+func (parsed rawHeader) sanitized() (h Header, err error) {
-	return Header{
+	for k, v := range parsed {
-		KeyID:      parsed.Kid,
+		if v == nil {
-		JSONWebKey: parsed.Jwk,
+			continue
-		Algorithm:  parsed.Alg,
+		}
-		Nonce:      parsed.Nonce,
+		switch k {
+		case headerJWK:
+			var jwk *JSONWebKey
+			err = json.Unmarshal(*v, &jwk)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal JWK: %v: %#v", err, string(*v))
+				return
+			}
+			h.JSONWebKey = jwk
+		case headerKeyID:
+			var s string
+			err = json.Unmarshal(*v, &s)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal key ID: %v: %#v", err, string(*v))
+				return
+			}
+			h.KeyID = s
+		case headerAlgorithm:
+			var s string
+			err = json.Unmarshal(*v, &s)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal algorithm: %v: %#v", err, string(*v))
+				return
+			}
+			h.Algorithm = s
+		case headerNonce:
+			var s string
+			err = json.Unmarshal(*v, &s)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal nonce: %v: %#v", err, string(*v))
+				return
+			}
+			h.Nonce = s
+		case headerX5c:
+			c := []string{}
+			err = json.Unmarshal(*v, &c)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal x5c header: %v: %#v", err, string(*v))
+				return
+			}
+			h.certificates, err = parseCertificateChain(c)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal x5c header: %v: %#v", err, string(*v))
+				return
+			}
+		default:
+			if h.ExtraHeaders == nil {
+				h.ExtraHeaders = map[HeaderKey]interface{}{}
+			}
+			var v2 interface{}
+			err = json.Unmarshal(*v, &v2)
+			if err != nil {
+				err = fmt.Errorf("failed to unmarshal value: %v: %#v", err, string(*v))
+				return
+			}
+			h.ExtraHeaders[k] = v2
+		}
 	}
+	return
+}
+
+func parseCertificateChain(chain []string) ([]*x509.Certificate, error) {
+	out := make([]*x509.Certificate, len(chain))
+	for i, cert := range chain {
+		raw, err := base64.StdEncoding.DecodeString(cert)
+		if err != nil {
+			return nil, err
+		}
+		out[i], err = x509.ParseCertificate(raw)
+		if err != nil {
+			return nil, err
+		}
+	}
+	return out, nil
+}
+
+func (dst rawHeader) isSet(k HeaderKey) bool {
+	dvr := dst[k]
+	if dvr == nil {
+		return false
+	}
+
+	var dv interface{}
+	err := json.Unmarshal(*dvr, &dv)
+	if err != nil {
+		return true
+	}
+
+	if dvStr, ok := dv.(string); ok {
+		return dvStr != ""
+	}
+
+	return true
 }
 
 // Merge headers from src into dst, giving precedence to headers from l.
-func (dst *rawHeader) merge(src *rawHeader) {
+func (dst rawHeader) merge(src *rawHeader) {
 	if src == nil {
 		return
 	}
 
-	if dst.Alg == "" {
+	for k, v := range *src {
-		dst.Alg = src.Alg
+		if dst.isSet(k) {
-	}
+			continue
-	if dst.Enc == "" {
+		}
-		dst.Enc = src.Enc
+
-	}
+		dst[k] = v
-	if dst.Zip == "" {
-		dst.Zip = src.Zip
-	}
-	if dst.Crit == nil {
-		dst.Crit = src.Crit
-	}
-	if dst.Crit == nil {
-		dst.Crit = src.Crit
-	}
-	if dst.Apu == nil {
-		dst.Apu = src.Apu
-	}
-	if dst.Apv == nil {
-		dst.Apv = src.Apv
-	}
-	if dst.Epk == nil {
-		dst.Epk = src.Epk
-	}
-	if dst.Iv == nil {
-		dst.Iv = src.Iv
-	}
-	if dst.Tag == nil {
-		dst.Tag = src.Tag
-	}
-	if dst.Kid == "" {
-		dst.Kid = src.Kid
-	}
-	if dst.Jwk == nil {
-		dst.Jwk = src.Jwk
-	}
-	if dst.Nonce == "" {
-		dst.Nonce = src.Nonce
 	}
 }
 
@@ -222,3 +487,8 @@ func curveSize(crv elliptic.Curve) int {
 
 	return div + 1
 }
+
+func makeRawMessage(b []byte) *json.RawMessage {
+	rm := json.RawMessage(b)
+	return &rm
+}

vendor/gopkg.in/square/go-jose.v2/signing.go

@@ -22,6 +22,10 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
+
+	"golang.org/x/crypto/ed25519"
+
+	"gopkg.in/square/go-jose.v2/json"
 )
 
 // NonceSource represents a source of random nonces to go into JWS objects
@@ -32,6 +36,7 @@ type NonceSource interface {
 // Signer represents a signer which takes a payload and produces a signed JWS object.
 type Signer interface {
 	Sign(payload []byte) (*JSONWebSignature, error)
+	Options() SignerOptions
 }
 
 // SigningKey represents an algorithm/key used to sign a message.
@@ -44,6 +49,32 @@ type SigningKey struct {
 type SignerOptions struct {
 	NonceSource NonceSource
 	EmbedJWK    bool
+
+	// Optional map of additional keys to be inserted into the protected header
+	// of a JWS object. Some specifications which make use of JWS like to insert
+	// additional values here. All values must be JSON-serializable.
+	ExtraHeaders map[HeaderKey]interface{}
+}
+
+// WithHeader adds an arbitrary value to the ExtraHeaders map, initializing it
+// if necessary. It returns itself and so can be used in a fluent style.
+func (so *SignerOptions) WithHeader(k HeaderKey, v interface{}) *SignerOptions {
+	if so.ExtraHeaders == nil {
+		so.ExtraHeaders = map[HeaderKey]interface{}{}
+	}
+	so.ExtraHeaders[k] = v
+	return so
+}
+
+// WithContentType adds a content type ("cty") header and returns the updated
+// SignerOptions.
+func (so *SignerOptions) WithContentType(contentType ContentType) *SignerOptions {
+	return so.WithHeader(HeaderContentType, contentType)
+}
+
+// WithType adds a type ("typ") header and returns the updated SignerOptions.
+func (so *SignerOptions) WithType(typ ContentType) *SignerOptions {
+	return so.WithHeader(HeaderType, typ)
 }
 
 type payloadSigner interface {
@@ -55,17 +86,24 @@ type payloadVerifier interface {
 }
 
 type genericSigner struct {
-	recipients  []recipientSigInfo
+	recipients   []recipientSigInfo
-	nonceSource NonceSource
+	nonceSource  NonceSource
-	embedJWK    bool
+	embedJWK     bool
+	extraHeaders map[HeaderKey]interface{}
 }
 
 type recipientSigInfo struct {
 	sigAlg    SignatureAlgorithm
-	publicKey *JSONWebKey
+	publicKey func() *JSONWebKey
 	signer    payloadSigner
 }
 
+func staticPublicKey(jwk *JSONWebKey) func() *JSONWebKey {
+	return func() *JSONWebKey {
+		return jwk
+	}
+}
+
 // NewSigner creates an appropriate signer based on the key type
 func NewSigner(sig SigningKey, opts *SignerOptions) (Signer, error) {
 	return NewMultiSigner([]SigningKey{sig}, opts)
@@ -78,6 +116,7 @@ func NewMultiSigner(sigs []SigningKey, opts *SignerOptions) (Signer, error) {
 	if opts != nil {
 		signer.nonceSource = opts.NonceSource
 		signer.embedJWK = opts.EmbedJWK
+		signer.extraHeaders = opts.ExtraHeaders
 	}
 
 	for _, sig := range sigs {
@@ -93,6 +132,10 @@ func NewMultiSigner(sigs []SigningKey, opts *SignerOptions) (Signer, error) {
 // newVerifier creates a verifier based on the key type
 func newVerifier(verificationKey interface{}) (payloadVerifier, error) {
 	switch verificationKey := verificationKey.(type) {
+	case ed25519.PublicKey:
+		return &edEncrypterVerifier{
+			publicKey: verificationKey,
+		}, nil
 	case *rsa.PublicKey:
 		return &rsaEncrypterVerifier{
 			publicKey: verificationKey,
@@ -105,11 +148,15 @@ func newVerifier(verificationKey interface{}) (payloadVerifier, error) {
 		return &symmetricMac{
 			key: verificationKey,
 		}, nil
+	case JSONWebKey:
+		return newVerifier(verificationKey.Key)
 	case *JSONWebKey:
 		return newVerifier(verificationKey.Key)
-	default:
-		return nil, ErrUnsupportedKeyType
 	}
+	if ov, ok := verificationKey.(OpaqueVerifier); ok {
+		return &opaqueVerifier{verifier: ov}, nil
+	}
+	return nil, ErrUnsupportedKeyType
 }
 
 func (ctx *genericSigner) addRecipient(alg SignatureAlgorithm, signingKey interface{}) error {
@@ -124,22 +171,44 @@ func (ctx *genericSigner) addRecipient(alg SignatureAlgorithm, signingKey interf
 
 func makeJWSRecipient(alg SignatureAlgorithm, signingKey interface{}) (recipientSigInfo, error) {
 	switch signingKey := signingKey.(type) {
+	case ed25519.PrivateKey:
+		return newEd25519Signer(alg, signingKey)
 	case *rsa.PrivateKey:
 		return newRSASigner(alg, signingKey)
 	case *ecdsa.PrivateKey:
 		return newECDSASigner(alg, signingKey)
 	case []byte:
 		return newSymmetricSigner(alg, signingKey)
+	case JSONWebKey:
+		return newJWKSigner(alg, signingKey)
 	case *JSONWebKey:
-		recipient, err := makeJWSRecipient(alg, signingKey.Key)
+		return newJWKSigner(alg, *signingKey)
-		if err != nil {
-			return recipientSigInfo{}, err
-		}
-		recipient.publicKey.KeyID = signingKey.KeyID
-		return recipient, nil
-	default:
-		return recipientSigInfo{}, ErrUnsupportedKeyType
 	}
+	if signer, ok := signingKey.(OpaqueSigner); ok {
+		return newOpaqueSigner(alg, signer)
+	}
+	return recipientSigInfo{}, ErrUnsupportedKeyType
+}
+
+func newJWKSigner(alg SignatureAlgorithm, signingKey JSONWebKey) (recipientSigInfo, error) {
+	recipient, err := makeJWSRecipient(alg, signingKey.Key)
+	if err != nil {
+		return recipientSigInfo{}, err
+	}
+	if recipient.publicKey != nil && recipient.publicKey() != nil {
+		// recipient.publicKey is a JWK synthesized for embedding when recipientSigInfo
+		// was created for the inner key (such as a RSA or ECDSA public key). It contains
+		// the pub key for embedding, but doesn't have extra params like key id.
+		publicKey := signingKey
+		publicKey.Key = recipient.publicKey().Key
+		recipient.publicKey = staticPublicKey(&publicKey)
+
+		// This should be impossible, but let's check anyway.
+		if !recipient.publicKey().IsPublic() {
+			return recipientSigInfo{}, errors.New("square/go-jose: public key was unexpectedly not public")
+		}
+	}
+	return recipient, nil
 }
 
 func (ctx *genericSigner) Sign(payload []byte) (*JSONWebSignature, error) {
@@ -148,15 +217,24 @@ func (ctx *genericSigner) Sign(payload []byte) (*JSONWebSignature, error) {
 	obj.Signatures = make([]Signature, len(ctx.recipients))
 
 	for i, recipient := range ctx.recipients {
-		protected := &rawHeader{
+		protected := map[HeaderKey]interface{}{
-			Alg: string(recipient.sigAlg),
+			headerAlgorithm: string(recipient.sigAlg),
 		}
 
-		if recipient.publicKey != nil {
+		if recipient.publicKey != nil && recipient.publicKey() != nil {
+			// We want to embed the JWK or set the kid header, but not both. Having a protected
+			// header that contains an embedded JWK while also simultaneously containing the kid
+			// header is confusing, and at least in ACME the two are considered to be mutually
+			// exclusive. The fact that both can exist at the same time is a somewhat unfortunate
+			// result of the JOSE spec. We've decided that this library will only include one or
+			// the other to avoid this confusion.
+			//
+			// See https://github.com/square/go-jose/issues/157 for more context.
 			if ctx.embedJWK {
-				protected.Jwk = recipient.publicKey
+				protected[headerJWK] = recipient.publicKey()
+			} else {
+				protected[headerKeyID] = recipient.publicKey().KeyID
 			}
-			protected.Kid = recipient.publicKey.KeyID
 		}
 
 		if ctx.nonceSource != nil {
@@ -164,7 +242,11 @@ func (ctx *genericSigner) Sign(payload []byte) (*JSONWebSignature, error) {
 			if err != nil {
 				return nil, fmt.Errorf("square/go-jose: Error generating nonce: %v", err)
 			}
-			protected.Nonce = nonce
+			protected[headerNonce] = nonce
+		}
+
+		for k, v := range ctx.extraHeaders {
+			protected[k] = v
 		}
 
 		serializedProtected := mustSerializeJSON(protected)
@@ -178,13 +260,28 @@ func (ctx *genericSigner) Sign(payload []byte) (*JSONWebSignature, error) {
 			return nil, err
 		}
 
-		signatureInfo.protected = protected
+		signatureInfo.protected = &rawHeader{}
+		for k, v := range protected {
+			b, err := json.Marshal(v)
+			if err != nil {
+				return nil, fmt.Errorf("square/go-jose: Error marshalling item %#v: %v", k, err)
+			}
+			(*signatureInfo.protected)[k] = makeRawMessage(b)
+		}
 		obj.Signatures[i] = signatureInfo
 	}
 
 	return obj, nil
 }
 
+func (ctx *genericSigner) Options() SignerOptions {
+	return SignerOptions{
+		NonceSource:  ctx.nonceSource,
+		EmbedJWK:     ctx.embedJWK,
+		ExtraHeaders: ctx.extraHeaders,
+	}
+}
+
 // Verify validates the signature on the object and returns the payload.
 // This function does not support multi-signature, if you desire multi-sig
 // verification use VerifyMulti instead.
@@ -193,30 +290,53 @@ func (ctx *genericSigner) Sign(payload []byte) (*JSONWebSignature, error) {
 // payload header. You cannot assume that the key received in a payload is
 // trusted.
 func (obj JSONWebSignature) Verify(verificationKey interface{}) ([]byte, error) {
-	verifier, err := newVerifier(verificationKey)
+	err := obj.DetachedVerify(obj.payload, verificationKey)
 	if err != nil {
 		return nil, err
 	}
+	return obj.payload, nil
+}
+
+// UnsafePayloadWithoutVerification returns the payload without
+// verifying it. The content returned from this function cannot be
+// trusted.
+func (obj JSONWebSignature) UnsafePayloadWithoutVerification() []byte {
+	return obj.payload
+}
+
+// DetachedVerify validates a detached signature on the given payload. In
+// most cases, you will probably want to use Verify instead. DetachedVerify
+// is only useful if you have a payload and signature that are separated from
+// each other.
+func (obj JSONWebSignature) DetachedVerify(payload []byte, verificationKey interface{}) error {
+	verifier, err := newVerifier(verificationKey)
+	if err != nil {
+		return err
+	}
 
 	if len(obj.Signatures) > 1 {
-		return nil, errors.New("square/go-jose: too many signatures in payload; expecting only one")
+		return errors.New("square/go-jose: too many signatures in payload; expecting only one")
 	}
 
 	signature := obj.Signatures[0]
 	headers := signature.mergedHeaders()
-	if len(headers.Crit) > 0 {
+	critical, err := headers.getCritical()
+	if err != nil {
+		return err
+	}
+	if len(critical) > 0 {
 		// Unsupported crit header
-		return nil, ErrCryptoFailure
+		return ErrCryptoFailure
 	}
 
-	input := obj.computeAuthData(&signature)
+	input := obj.computeAuthData(payload, &signature)
-	alg := SignatureAlgorithm(headers.Alg)
+	alg := headers.getSignatureAlgorithm()
 	err = verifier.verifyPayload(input, signature.Signature, alg)
 	if err == nil {
-		return obj.payload, nil
+		return nil
 	}
 
-	return nil, ErrCryptoFailure
+	return ErrCryptoFailure
 }
 
 // VerifyMulti validates (one of the multiple) signatures on the object and
@@ -224,25 +344,46 @@ func (obj JSONWebSignature) Verify(verificationKey interface{}) ([]byte, error)
 // object and the payload. We return the signature and index to guarantee that
 // callers are getting the verified value.
 func (obj JSONWebSignature) VerifyMulti(verificationKey interface{}) (int, Signature, []byte, error) {
-	verifier, err := newVerifier(verificationKey)
+	idx, sig, err := obj.DetachedVerifyMulti(obj.payload, verificationKey)
 	if err != nil {
 		return -1, Signature{}, nil, err
 	}
+	return idx, sig, obj.payload, nil
+}
+
+// DetachedVerifyMulti validates a detached signature on the given payload with
+// a signature/object that has potentially multiple signers. This returns the index
+// of the signature that was verified, along with the signature object. We return
+// the signature and index to guarantee that callers are getting the verified value.
+//
+// In most cases, you will probably want to use Verify or VerifyMulti instead.
+// DetachedVerifyMulti is only useful if you have a payload and signature that are
+// separated from each other, and the signature can have multiple signers at the
+// same time.
+func (obj JSONWebSignature) DetachedVerifyMulti(payload []byte, verificationKey interface{}) (int, Signature, error) {
+	verifier, err := newVerifier(verificationKey)
+	if err != nil {
+		return -1, Signature{}, err
+	}
 
 	for i, signature := range obj.Signatures {
 		headers := signature.mergedHeaders()
-		if len(headers.Crit) > 0 {
+		critical, err := headers.getCritical()
+		if err != nil {
+			continue
+		}
+		if len(critical) > 0 {
 			// Unsupported crit header
 			continue
 		}
 
-		input := obj.computeAuthData(&signature)
+		input := obj.computeAuthData(payload, &signature)
-		alg := SignatureAlgorithm(headers.Alg)
+		alg := headers.getSignatureAlgorithm()
-		err := verifier.verifyPayload(input, signature.Signature, alg)
+		err = verifier.verifyPayload(input, signature.Signature, alg)
 		if err == nil {
-			return i, signature, obj.payload, nil
+			return i, signature, nil
 		}
 	}
 
-	return -1, Signature{}, nil, ErrCryptoFailure
+	return -1, Signature{}, ErrCryptoFailure
 }

vendor/gopkg.in/square/go-jose.v2/symmetric.go

@@ -17,6 +17,7 @@
 package jose
 
 import (
+	"bytes"
 	"crypto/aes"
 	"crypto/cipher"
 	"crypto/hmac"
@@ -25,18 +26,34 @@ import (
 	"crypto/sha512"
 	"crypto/subtle"
 	"errors"
+	"fmt"
 	"hash"
 	"io"
 
+	"golang.org/x/crypto/pbkdf2"
 	"gopkg.in/square/go-jose.v2/cipher"
 )
 
 // Random reader (stubbed out in tests)
 var randReader = rand.Reader
 
+const (
+	// RFC7518 recommends a minimum of 1,000 iterations:
+	// https://tools.ietf.org/html/rfc7518#section-4.8.1.2
+	// NIST recommends a minimum of 10,000:
+	// https://pages.nist.gov/800-63-3/sp800-63b.html
+	// 1Password uses 100,000:
+	// https://support.1password.com/pbkdf2/
+	defaultP2C = 100000
+	// Default salt size: 128 bits
+	defaultP2SSize = 16
+)
+
 // Dummy key cipher for shared symmetric key mode
 type symmetricKeyCipher struct {
 	key []byte // Pre-shared content-encryption key
+	p2c int    // PBES2 Count
+	p2s []byte // PBES2 Salt Input
 }
 
 // Signer/verifier for MAC modes
@@ -113,10 +130,37 @@ func getContentCipher(alg ContentEncryption) contentCipher {
 	}
 }
 
+// getPbkdf2Params returns the key length and hash function used in
+// pbkdf2.Key.
+func getPbkdf2Params(alg KeyAlgorithm) (int, func() hash.Hash) {
+	switch alg {
+	case PBES2_HS256_A128KW:
+		return 16, sha256.New
+	case PBES2_HS384_A192KW:
+		return 24, sha512.New384
+	case PBES2_HS512_A256KW:
+		return 32, sha512.New
+	default:
+		panic("invalid algorithm")
+	}
+}
+
+// getRandomSalt generates a new salt of the given size.
+func getRandomSalt(size int) ([]byte, error) {
+	salt := make([]byte, size)
+	_, err := io.ReadFull(randReader, salt)
+	if err != nil {
+		return nil, err
+	}
+
+	return salt, nil
+}
+
 // newSymmetricRecipient creates a JWE encrypter based on AES-GCM key wrap.
 func newSymmetricRecipient(keyAlg KeyAlgorithm, key []byte) (recipientKeyInfo, error) {
 	switch keyAlg {
 	case DIRECT, A128GCMKW, A192GCMKW, A256GCMKW, A128KW, A192KW, A256KW:
+	case PBES2_HS256_A128KW, PBES2_HS384_A192KW, PBES2_HS512_A256KW:
 	default:
 		return recipientKeyInfo{}, ErrUnsupportedAlgorithm
 	}
@@ -211,6 +255,10 @@ func (ctx aeadContentCipher) decrypt(key, aad []byte, parts *aeadParts) ([]byte,
 		return nil, err
 	}
 
+	if len(parts.iv) != aead.NonceSize() || len(parts.tag) < ctx.authtagBytes {
+		return nil, ErrCryptoFailure
+	}
+
 	return aead.Open(nil, parts.iv, append(parts.ciphertext, parts.tag...), aad)
 }
 
@@ -229,11 +277,12 @@ func (ctx *symmetricKeyCipher) encryptKey(cek []byte, alg KeyAlgorithm) (recipie
 			return recipientInfo{}, err
 		}
 
+		header := &rawHeader{}
+		header.set(headerIV, newBuffer(parts.iv))
+		header.set(headerTag, newBuffer(parts.tag))
+
 		return recipientInfo{
-			header: &rawHeader{
+			header:       header,
-				Iv:  newBuffer(parts.iv),
-				Tag: newBuffer(parts.tag),
-			},
 			encryptedKey: parts.ciphertext,
 		}, nil
 	case A128KW, A192KW, A256KW:
@@ -251,6 +300,45 @@ func (ctx *symmetricKeyCipher) encryptKey(cek []byte, alg KeyAlgorithm) (recipie
 			encryptedKey: jek,
 			header:       &rawHeader{},
 		}, nil
+	case PBES2_HS256_A128KW, PBES2_HS384_A192KW, PBES2_HS512_A256KW:
+		if len(ctx.p2s) == 0 {
+			salt, err := getRandomSalt(defaultP2SSize)
+			if err != nil {
+				return recipientInfo{}, err
+			}
+			ctx.p2s = salt
+		}
+
+		if ctx.p2c <= 0 {
+			ctx.p2c = defaultP2C
+		}
+
+		// salt is UTF8(Alg) || 0x00 || Salt Input
+		salt := bytes.Join([][]byte{[]byte(alg), ctx.p2s}, []byte{0x00})
+
+		// derive key
+		keyLen, h := getPbkdf2Params(alg)
+		key := pbkdf2.Key(ctx.key, salt, ctx.p2c, keyLen, h)
+
+		// use AES cipher with derived key
+		block, err := aes.NewCipher(key)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		jek, err := josecipher.KeyWrap(block, cek)
+		if err != nil {
+			return recipientInfo{}, err
+		}
+
+		header := &rawHeader{}
+		header.set(headerP2C, ctx.p2c)
+		header.set(headerP2S, newBuffer(ctx.p2s))
+
+		return recipientInfo{
+			encryptedKey: jek,
+			header:       header,
+		}, nil
 	}
 
 	return recipientInfo{}, ErrUnsupportedAlgorithm
@@ -258,7 +346,7 @@ func (ctx *symmetricKeyCipher) encryptKey(cek []byte, alg KeyAlgorithm) (recipie
 
 // Decrypt the content encryption key.
 func (ctx *symmetricKeyCipher) decryptKey(headers rawHeader, recipient *recipientInfo, generator keyGenerator) ([]byte, error) {
-	switch KeyAlgorithm(headers.Alg) {
+	switch headers.getAlgorithm() {
 	case DIRECT:
 		cek := make([]byte, len(ctx.key))
 		copy(cek, ctx.key)
@@ -266,10 +354,19 @@ func (ctx *symmetricKeyCipher) decryptKey(headers rawHeader, recipient *recipien
 	case A128GCMKW, A192GCMKW, A256GCMKW:
 		aead := newAESGCM(len(ctx.key))
 
+		iv, err := headers.getIV()
+		if err != nil {
+			return nil, fmt.Errorf("square/go-jose: invalid IV: %v", err)
+		}
+		tag, err := headers.getTag()
+		if err != nil {
+			return nil, fmt.Errorf("square/go-jose: invalid tag: %v", err)
+		}
+
 		parts := &aeadParts{
-			iv:         headers.Iv.bytes(),
+			iv:         iv.bytes(),
 			ciphertext: recipient.encryptedKey,
-			tag:        headers.Tag.bytes(),
+			tag:        tag.bytes(),
 		}
 
 		cek, err := aead.decrypt(ctx.key, []byte{}, parts)
@@ -284,6 +381,42 @@ func (ctx *symmetricKeyCipher) decryptKey(headers rawHeader, recipient *recipien
 			return nil, err
 		}
 
+		cek, err := josecipher.KeyUnwrap(block, recipient.encryptedKey)
+		if err != nil {
+			return nil, err
+		}
+		return cek, nil
+	case PBES2_HS256_A128KW, PBES2_HS384_A192KW, PBES2_HS512_A256KW:
+		p2s, err := headers.getP2S()
+		if err != nil {
+			return nil, fmt.Errorf("square/go-jose: invalid P2S: %v", err)
+		}
+		if p2s == nil || len(p2s.data) == 0 {
+			return nil, fmt.Errorf("square/go-jose: invalid P2S: must be present")
+		}
+
+		p2c, err := headers.getP2C()
+		if err != nil {
+			return nil, fmt.Errorf("square/go-jose: invalid P2C: %v", err)
+		}
+		if p2c <= 0 {
+			return nil, fmt.Errorf("square/go-jose: invalid P2C: must be a positive integer")
+		}
+
+		// salt is UTF8(Alg) || 0x00 || Salt Input
+		alg := headers.getAlgorithm()
+		salt := bytes.Join([][]byte{[]byte(alg), p2s.bytes()}, []byte{0x00})
+
+		// derive key
+		keyLen, h := getPbkdf2Params(alg)
+		key := pbkdf2.Key(ctx.key, salt, p2c, keyLen, h)
+
+		// use AES cipher with derived key
+		block, err := aes.NewCipher(key)
+		if err != nil {
+			return nil, err
+		}
+
 		cek, err := josecipher.KeyUnwrap(block, recipient.encryptedKey)
 		if err != nil {
 			return nil, err