diff --git a/glide.lock b/glide.lock index f4077196..82e1f2a8 100644 --- a/glide.lock +++ b/glide.lock @@ -1,5 +1,5 @@ -hash: c41e5b1fbd68f04f14b6e9b2ebab8bf18b857b3dc3a5754e4adf7c1884981de7 -updated: 2018-09-05T08:40:39.486766558+02:00 +hash: 12d0ad2fc0df4ab221e45c1ba7821708b908033c82741e250cc46dcd445b67eb +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 diff --git a/glide.yaml b/glide.yaml index c08d7359..bde92ea2 100644 --- a/glide.yaml +++ b/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 diff --git a/vendor/golang.org/x/crypto/ed25519/ed25519.go b/vendor/golang.org/x/crypto/ed25519/ed25519.go new file mode 100644 index 00000000..f1d95674 --- /dev/null +++ b/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 +} diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go new file mode 100644 index 00000000..e39f086c --- /dev/null +++ b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/const.go @@ -0,0 +1,1422 @@ +// 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 edwards25519 + +// These values are from the public domain, “ref10” implementation of ed25519 +// from SUPERCOP. + +// d is a constant in the Edwards curve equation. +var d = FieldElement{ + -10913610, 13857413, -15372611, 6949391, 114729, -8787816, -6275908, -3247719, -18696448, -12055116, +} + +// d2 is 2*d. +var d2 = FieldElement{ + -21827239, -5839606, -30745221, 13898782, 229458, 15978800, -12551817, -6495438, 29715968, 9444199, +} + +// SqrtM1 is the square-root of -1 in the field. +var SqrtM1 = FieldElement{ + -32595792, -7943725, 9377950, 3500415, 12389472, -272473, -25146209, -2005654, 326686, 11406482, +} + +// A is a constant in the Montgomery-form of curve25519. +var A = FieldElement{ + 486662, 0, 0, 0, 0, 0, 0, 0, 0, 0, +} + +// bi contains precomputed multiples of the base-point. See the Ed25519 paper +// for a discussion about how these values are used. +var bi = [8]PreComputedGroupElement{ + { + FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605}, + FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378}, + FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546}, + }, + { + FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024}, + FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574}, + FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357}, + }, + { + FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380}, + FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306}, + FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942}, + }, + { + FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766}, + FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701}, + FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300}, + }, + { + FieldElement{-22518993, -6692182, 14201702, -8745502, -23510406, 8844726, 18474211, -1361450, -13062696, 13821877}, + FieldElement{-6455177, -7839871, 3374702, -4740862, -27098617, -10571707, 31655028, -7212327, 18853322, -14220951}, + FieldElement{4566830, -12963868, -28974889, -12240689, -7602672, -2830569, -8514358, -10431137, 2207753, -3209784}, + }, + { + FieldElement{-25154831, -4185821, 29681144, 7868801, -6854661, -9423865, -12437364, -663000, -31111463, -16132436}, + FieldElement{25576264, -2703214, 7349804, -11814844, 16472782, 9300885, 3844789, 15725684, 171356, 6466918}, + FieldElement{23103977, 13316479, 9739013, -16149481, 817875, -15038942, 8965339, -14088058, -30714912, 16193877}, + }, + { + FieldElement{-33521811, 3180713, -2394130, 14003687, -16903474, -16270840, 17238398, 4729455, -18074513, 9256800}, + FieldElement{-25182317, -4174131, 32336398, 5036987, -21236817, 11360617, 22616405, 9761698, -19827198, 630305}, + FieldElement{-13720693, 2639453, -24237460, -7406481, 9494427, -5774029, -6554551, -15960994, -2449256, -14291300}, + }, + { + FieldElement{-3151181, -5046075, 9282714, 6866145, -31907062, -863023, -18940575, 15033784, 25105118, -7894876}, + FieldElement{-24326370, 15950226, -31801215, -14592823, -11662737, -5090925, 1573892, -2625887, 2198790, -15804619}, + FieldElement{-3099351, 10324967, -2241613, 7453183, -5446979, -2735503, -13812022, -16236442, -32461234, -12290683}, + }, +} + +// base contains precomputed multiples of the base-point. See the Ed25519 paper +// for a discussion about how these values are used. +var base = [32][8]PreComputedGroupElement{ + { + { + FieldElement{25967493, -14356035, 29566456, 3660896, -12694345, 4014787, 27544626, -11754271, -6079156, 2047605}, + FieldElement{-12545711, 934262, -2722910, 3049990, -727428, 9406986, 12720692, 5043384, 19500929, -15469378}, + FieldElement{-8738181, 4489570, 9688441, -14785194, 10184609, -12363380, 29287919, 11864899, -24514362, -4438546}, + }, + { + FieldElement{-12815894, -12976347, -21581243, 11784320, -25355658, -2750717, -11717903, -3814571, -358445, -10211303}, + FieldElement{-21703237, 6903825, 27185491, 6451973, -29577724, -9554005, -15616551, 11189268, -26829678, -5319081}, + FieldElement{26966642, 11152617, 32442495, 15396054, 14353839, -12752335, -3128826, -9541118, -15472047, -4166697}, + }, + { + FieldElement{15636291, -9688557, 24204773, -7912398, 616977, -16685262, 27787600, -14772189, 28944400, -1550024}, + FieldElement{16568933, 4717097, -11556148, -1102322, 15682896, -11807043, 16354577, -11775962, 7689662, 11199574}, + FieldElement{30464156, -5976125, -11779434, -15670865, 23220365, 15915852, 7512774, 10017326, -17749093, -9920357}, + }, + { + FieldElement{-17036878, 13921892, 10945806, -6033431, 27105052, -16084379, -28926210, 15006023, 3284568, -6276540}, + FieldElement{23599295, -8306047, -11193664, -7687416, 13236774, 10506355, 7464579, 9656445, 13059162, 10374397}, + FieldElement{7798556, 16710257, 3033922, 2874086, 28997861, 2835604, 32406664, -3839045, -641708, -101325}, + }, + { + FieldElement{10861363, 11473154, 27284546, 1981175, -30064349, 12577861, 32867885, 14515107, -15438304, 10819380}, + FieldElement{4708026, 6336745, 20377586, 9066809, -11272109, 6594696, -25653668, 12483688, -12668491, 5581306}, + FieldElement{19563160, 16186464, -29386857, 4097519, 10237984, -4348115, 28542350, 13850243, -23678021, -15815942}, + }, + { + FieldElement{-15371964, -12862754, 32573250, 4720197, -26436522, 5875511, -19188627, -15224819, -9818940, -12085777}, + FieldElement{-8549212, 109983, 15149363, 2178705, 22900618, 4543417, 3044240, -15689887, 1762328, 14866737}, + FieldElement{-18199695, -15951423, -10473290, 1707278, -17185920, 3916101, -28236412, 3959421, 27914454, 4383652}, + }, + { + FieldElement{5153746, 9909285, 1723747, -2777874, 30523605, 5516873, 19480852, 5230134, -23952439, -15175766}, + FieldElement{-30269007, -3463509, 7665486, 10083793, 28475525, 1649722, 20654025, 16520125, 30598449, 7715701}, + FieldElement{28881845, 14381568, 9657904, 3680757, -20181635, 7843316, -31400660, 1370708, 29794553, -1409300}, + }, + { + FieldElement{14499471, -2729599, -33191113, -4254652, 28494862, 14271267, 30290735, 10876454, -33154098, 2381726}, + FieldElement{-7195431, -2655363, -14730155, 462251, -27724326, 3941372, -6236617, 3696005, -32300832, 15351955}, + FieldElement{27431194, 8222322, 16448760, -3907995, -18707002, 11938355, -32961401, -2970515, 29551813, 10109425}, + }, + }, + { + { + FieldElement{-13657040, -13155431, -31283750, 11777098, 21447386, 6519384, -2378284, -1627556, 10092783, -4764171}, + FieldElement{27939166, 14210322, 4677035, 16277044, -22964462, -12398139, -32508754, 12005538, -17810127, 12803510}, + FieldElement{17228999, -15661624, -1233527, 300140, -1224870, -11714777, 30364213, -9038194, 18016357, 4397660}, + }, + { + FieldElement{-10958843, -7690207, 4776341, -14954238, 27850028, -15602212, -26619106, 14544525, -17477504, 982639}, + FieldElement{29253598, 15796703, -2863982, -9908884, 10057023, 3163536, 7332899, -4120128, -21047696, 9934963}, + FieldElement{5793303, 16271923, -24131614, -10116404, 29188560, 1206517, -14747930, 4559895, -30123922, -10897950}, + }, + { + FieldElement{-27643952, -11493006, 16282657, -11036493, 28414021, -15012264, 24191034, 4541697, -13338309, 5500568}, + FieldElement{12650548, -1497113, 9052871, 11355358, -17680037, -8400164, -17430592, 12264343, 10874051, 13524335}, + FieldElement{25556948, -3045990, 714651, 2510400, 23394682, -10415330, 33119038, 5080568, -22528059, 5376628}, + }, + { + FieldElement{-26088264, -4011052, -17013699, -3537628, -6726793, 1920897, -22321305, -9447443, 4535768, 1569007}, + FieldElement{-2255422, 14606630, -21692440, -8039818, 28430649, 8775819, -30494562, 3044290, 31848280, 12543772}, + FieldElement{-22028579, 2943893, -31857513, 6777306, 13784462, -4292203, -27377195, -2062731, 7718482, 14474653}, + }, + { + FieldElement{2385315, 2454213, -22631320, 46603, -4437935, -15680415, 656965, -7236665, 24316168, -5253567}, + FieldElement{13741529, 10911568, -33233417, -8603737, -20177830, -1033297, 33040651, -13424532, -20729456, 8321686}, + FieldElement{21060490, -2212744, 15712757, -4336099, 1639040, 10656336, 23845965, -11874838, -9984458, 608372}, + }, + { + FieldElement{-13672732, -15087586, -10889693, -7557059, -6036909, 11305547, 1123968, -6780577, 27229399, 23887}, + FieldElement{-23244140, -294205, -11744728, 14712571, -29465699, -2029617, 12797024, -6440308, -1633405, 16678954}, + FieldElement{-29500620, 4770662, -16054387, 14001338, 7830047, 9564805, -1508144, -4795045, -17169265, 4904953}, + }, + { + FieldElement{24059557, 14617003, 19037157, -15039908, 19766093, -14906429, 5169211, 16191880, 2128236, -4326833}, + FieldElement{-16981152, 4124966, -8540610, -10653797, 30336522, -14105247, -29806336, 916033, -6882542, -2986532}, + FieldElement{-22630907, 12419372, -7134229, -7473371, -16478904, 16739175, 285431, 2763829, 15736322, 4143876}, + }, + { + FieldElement{2379352, 11839345, -4110402, -5988665, 11274298, 794957, 212801, -14594663, 23527084, -16458268}, + FieldElement{33431127, -11130478, -17838966, -15626900, 8909499, 8376530, -32625340, 4087881, -15188911, -14416214}, + FieldElement{1767683, 7197987, -13205226, -2022635, -13091350, 448826, 5799055, 4357868, -4774191, -16323038}, + }, + }, + { + { + FieldElement{6721966, 13833823, -23523388, -1551314, 26354293, -11863321, 23365147, -3949732, 7390890, 2759800}, + FieldElement{4409041, 2052381, 23373853, 10530217, 7676779, -12885954, 21302353, -4264057, 1244380, -12919645}, + FieldElement{-4421239, 7169619, 4982368, -2957590, 30256825, -2777540, 14086413, 9208236, 15886429, 16489664}, + }, + { + FieldElement{1996075, 10375649, 14346367, 13311202, -6874135, -16438411, -13693198, 398369, -30606455, -712933}, + FieldElement{-25307465, 9795880, -2777414, 14878809, -33531835, 14780363, 13348553, 12076947, -30836462, 5113182}, + FieldElement{-17770784, 11797796, 31950843, 13929123, -25888302, 12288344, -30341101, -7336386, 13847711, 5387222}, + }, + { + FieldElement{-18582163, -3416217, 17824843, -2340966, 22744343, -10442611, 8763061, 3617786, -19600662, 10370991}, + FieldElement{20246567, -14369378, 22358229, -543712, 18507283, -10413996, 14554437, -8746092, 32232924, 16763880}, + FieldElement{9648505, 10094563, 26416693, 14745928, -30374318, -6472621, 11094161, 15689506, 3140038, -16510092}, + }, + { + FieldElement{-16160072, 5472695, 31895588, 4744994, 8823515, 10365685, -27224800, 9448613, -28774454, 366295}, + FieldElement{19153450, 11523972, -11096490, -6503142, -24647631, 5420647, 28344573, 8041113, 719605, 11671788}, + FieldElement{8678025, 2694440, -6808014, 2517372, 4964326, 11152271, -15432916, -15266516, 27000813, -10195553}, + }, + { + FieldElement{-15157904, 7134312, 8639287, -2814877, -7235688, 10421742, 564065, 5336097, 6750977, -14521026}, + FieldElement{11836410, -3979488, 26297894, 16080799, 23455045, 15735944, 1695823, -8819122, 8169720, 16220347}, + FieldElement{-18115838, 8653647, 17578566, -6092619, -8025777, -16012763, -11144307, -2627664, -5990708, -14166033}, + }, + { + FieldElement{-23308498, -10968312, 15213228, -10081214, -30853605, -11050004, 27884329, 2847284, 2655861, 1738395}, + FieldElement{-27537433, -14253021, -25336301, -8002780, -9370762, 8129821, 21651608, -3239336, -19087449, -11005278}, + FieldElement{1533110, 3437855, 23735889, 459276, 29970501, 11335377, 26030092, 5821408, 10478196, 8544890}, + }, + { + FieldElement{32173121, -16129311, 24896207, 3921497, 22579056, -3410854, 19270449, 12217473, 17789017, -3395995}, + FieldElement{-30552961, -2228401, -15578829, -10147201, 13243889, 517024, 15479401, -3853233, 30460520, 1052596}, + FieldElement{-11614875, 13323618, 32618793, 8175907, -15230173, 12596687, 27491595, -4612359, 3179268, -9478891}, + }, + { + FieldElement{31947069, -14366651, -4640583, -15339921, -15125977, -6039709, -14756777, -16411740, 19072640, -9511060}, + FieldElement{11685058, 11822410, 3158003, -13952594, 33402194, -4165066, 5977896, -5215017, 473099, 5040608}, + FieldElement{-20290863, 8198642, -27410132, 11602123, 1290375, -2799760, 28326862, 1721092, -19558642, -3131606}, + }, + }, + { + { + FieldElement{7881532, 10687937, 7578723, 7738378, -18951012, -2553952, 21820786, 8076149, -27868496, 11538389}, + FieldElement{-19935666, 3899861, 18283497, -6801568, -15728660, -11249211, 8754525, 7446702, -5676054, 5797016}, + FieldElement{-11295600, 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-10406836, 8317860, 12352766}, + FieldElement{18200138, -14475911, -33087759, -2696619, -23702521, -9102511, -23552096, -2287550, 20712163, 6719373}, + }, + { + FieldElement{26656208, 6075253, -7858556, 1886072, -28344043, 4262326, 11117530, -3763210, 26224235, -3297458}, + FieldElement{-17168938, -14854097, -3395676, -16369877, -19954045, 14050420, 21728352, 9493610, 18620611, -16428628}, + FieldElement{-13323321, 13325349, 11432106, 5964811, 18609221, 6062965, -5269471, -9725556, -30701573, -16479657}, + }, + { + FieldElement{-23860538, -11233159, 26961357, 1640861, -32413112, -16737940, 12248509, -5240639, 13735342, 1934062}, + FieldElement{25089769, 6742589, 17081145, -13406266, 21909293, -16067981, -15136294, -3765346, -21277997, 5473616}, + FieldElement{31883677, -7961101, 1083432, -11572403, 22828471, 13290673, -7125085, 12469656, 29111212, -5451014}, + }, + { + FieldElement{24244947, -15050407, -26262976, 2791540, -14997599, 16666678, 24367466, 6388839, -10295587, 452383}, + FieldElement{-25640782, -3417841, 5217916, 16224624, 19987036, -4082269, -24236251, -5915248, 15766062, 8407814}, + FieldElement{-20406999, 13990231, 15495425, 16395525, 5377168, 15166495, -8917023, -4388953, -8067909, 2276718}, + }, + { + FieldElement{30157918, 12924066, -17712050, 9245753, 19895028, 3368142, -23827587, 5096219, 22740376, -7303417}, + FieldElement{2041139, -14256350, 7783687, 13876377, -25946985, -13352459, 24051124, 13742383, -15637599, 13295222}, + FieldElement{33338237, -8505733, 12532113, 7977527, 9106186, -1715251, -17720195, -4612972, -4451357, -14669444}, + }, + { + FieldElement{-20045281, 5454097, -14346548, 6447146, 28862071, 1883651, -2469266, -4141880, 7770569, 9620597}, + FieldElement{23208068, 7979712, 33071466, 8149229, 1758231, -10834995, 30945528, -1694323, -33502340, -14767970}, + FieldElement{1439958, -16270480, -1079989, -793782, 4625402, 10647766, -5043801, 1220118, 30494170, -11440799}, + }, + { + FieldElement{-5037580, -13028295, -2970559, -3061767, 15640974, -6701666, -26739026, 926050, -1684339, -13333647}, + FieldElement{13908495, -3549272, 30919928, -6273825, -21521863, 7989039, 9021034, 9078865, 3353509, 4033511}, + FieldElement{-29663431, -15113610, 32259991, -344482, 24295849, -12912123, 23161163, 8839127, 27485041, 7356032}, + }, + }, + { + { + FieldElement{9661027, 705443, 11980065, -5370154, -1628543, 14661173, -6346142, 2625015, 28431036, -16771834}, + FieldElement{-23839233, -8311415, -25945511, 7480958, -17681669, -8354183, -22545972, 14150565, 15970762, 4099461}, + FieldElement{29262576, 16756590, 26350592, -8793563, 8529671, -11208050, 13617293, -9937143, 11465739, 8317062}, + }, + { + FieldElement{-25493081, -6962928, 32500200, -9419051, -23038724, -2302222, 14898637, 3848455, 20969334, -5157516}, + FieldElement{-20384450, -14347713, -18336405, 13884722, -33039454, 2842114, -21610826, -3649888, 11177095, 14989547}, + FieldElement{-24496721, -11716016, 16959896, 2278463, 12066309, 10137771, 13515641, 2581286, -28487508, 9930240}, + }, + { + FieldElement{-17751622, -2097826, 16544300, -13009300, -15914807, -14949081, 18345767, -13403753, 16291481, -5314038}, + FieldElement{-33229194, 2553288, 32678213, 9875984, 8534129, 6889387, -9676774, 6957617, 4368891, 9788741}, + FieldElement{16660756, 7281060, -10830758, 12911820, 20108584, -8101676, -21722536, -8613148, 16250552, -11111103}, + }, + { + FieldElement{-19765507, 2390526, -16551031, 14161980, 1905286, 6414907, 4689584, 10604807, -30190403, 4782747}, + FieldElement{-1354539, 14736941, -7367442, -13292886, 7710542, -14155590, -9981571, 4383045, 22546403, 437323}, + FieldElement{31665577, -12180464, -16186830, 1491339, -18368625, 3294682, 27343084, 2786261, -30633590, -14097016}, + }, + { + FieldElement{-14467279, -683715, -33374107, 7448552, 19294360, 14334329, -19690631, 2355319, -19284671, -6114373}, + FieldElement{15121312, -15796162, 6377020, -6031361, -10798111, -12957845, 18952177, 15496498, -29380133, 11754228}, + FieldElement{-2637277, -13483075, 8488727, -14303896, 12728761, -1622493, 7141596, 11724556, 22761615, -10134141}, + }, + { + FieldElement{16918416, 11729663, -18083579, 3022987, -31015732, -13339659, -28741185, -12227393, 32851222, 11717399}, + FieldElement{11166634, 7338049, -6722523, 4531520, -29468672, -7302055, 31474879, 3483633, -1193175, -4030831}, + FieldElement{-185635, 9921305, 31456609, -13536438, -12013818, 13348923, 33142652, 6546660, -19985279, -3948376}, + }, + { + FieldElement{-32460596, 11266712, -11197107, -7899103, 31703694, 3855903, -8537131, -12833048, -30772034, -15486313}, + FieldElement{-18006477, 12709068, 3991746, -6479188, -21491523, -10550425, -31135347, -16049879, 10928917, 3011958}, + FieldElement{-6957757, -15594337, 31696059, 334240, 29576716, 14796075, -30831056, -12805180, 18008031, 10258577}, + }, + { + FieldElement{-22448644, 15655569, 7018479, -4410003, -30314266, -1201591, -1853465, 1367120, 25127874, 6671743}, + FieldElement{29701166, -14373934, -10878120, 9279288, -17568, 13127210, 21382910, 11042292, 25838796, 4642684}, + FieldElement{-20430234, 14955537, -24126347, 8124619, -5369288, -5990470, 30468147, -13900640, 18423289, 4177476}, + }, + }, +} diff --git a/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go new file mode 100644 index 00000000..5f8b9947 --- /dev/null +++ b/vendor/golang.org/x/crypto/ed25519/internal/edwards25519/edwards25519.go @@ -0,0 +1,1771 @@ +// 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 edwards25519 + +// This code is a port of the public domain, “ref10” implementation of ed25519 +// from SUPERCOP. + +// FieldElement represents an element of the field GF(2^255 - 19). An element +// t, entries t[0]...t[9], represents the integer t[0]+2^26 t[1]+2^51 t[2]+2^77 +// t[3]+2^102 t[4]+...+2^230 t[9]. Bounds on each t[i] vary depending on +// context. +type FieldElement [10]int32 + +var zero FieldElement + +func FeZero(fe *FieldElement) { + copy(fe[:], zero[:]) +} + +func FeOne(fe *FieldElement) { + FeZero(fe) + fe[0] = 1 +} + +func FeAdd(dst, a, b *FieldElement) { + dst[0] = a[0] + b[0] + dst[1] = a[1] + b[1] + dst[2] = a[2] + b[2] + dst[3] = a[3] + b[3] + dst[4] = a[4] + b[4] + dst[5] = a[5] + b[5] + dst[6] = a[6] + b[6] + dst[7] = a[7] + b[7] + dst[8] = a[8] + b[8] + dst[9] = a[9] + b[9] +} + +func FeSub(dst, a, b *FieldElement) { + dst[0] = a[0] - b[0] + dst[1] = a[1] - b[1] + dst[2] = a[2] - b[2] + dst[3] = a[3] - b[3] + dst[4] = a[4] - b[4] + dst[5] = a[5] - b[5] + dst[6] = a[6] - b[6] + dst[7] = a[7] - b[7] + dst[8] = a[8] - b[8] + dst[9] = a[9] - b[9] +} + +func FeCopy(dst, src *FieldElement) { + copy(dst[:], src[:]) +} + +// Replace (f,g) with (g,g) if b == 1; +// replace (f,g) with (f,g) if b == 0. +// +// Preconditions: b in {0,1}. +func FeCMove(f, g *FieldElement, b int32) { + b = -b + f[0] ^= b & (f[0] ^ g[0]) + f[1] ^= b & (f[1] ^ g[1]) + f[2] ^= b & (f[2] ^ g[2]) + f[3] ^= b & (f[3] ^ g[3]) + f[4] ^= b & (f[4] ^ g[4]) + f[5] ^= b & (f[5] ^ g[5]) + f[6] ^= b & (f[6] ^ g[6]) + f[7] ^= b & (f[7] ^ g[7]) + f[8] ^= b & (f[8] ^ g[8]) + f[9] ^= b & (f[9] ^ g[9]) +} + +func load3(in []byte) int64 { + var r int64 + r = int64(in[0]) + r |= int64(in[1]) << 8 + r |= int64(in[2]) << 16 + return r +} + +func load4(in []byte) int64 { + var r int64 + r = int64(in[0]) + r |= int64(in[1]) << 8 + r |= int64(in[2]) << 16 + r |= int64(in[3]) << 24 + return r +} + +func FeFromBytes(dst *FieldElement, src *[32]byte) { + h0 := load4(src[:]) + h1 := load3(src[4:]) << 6 + h2 := load3(src[7:]) << 5 + h3 := load3(src[10:]) << 3 + h4 := load3(src[13:]) << 2 + h5 := load4(src[16:]) + h6 := load3(src[20:]) << 7 + h7 := load3(src[23:]) << 5 + h8 := load3(src[26:]) << 4 + h9 := (load3(src[29:]) & 8388607) << 2 + + FeCombine(dst, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9) +} + +// FeToBytes marshals h to s. +// Preconditions: +// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +// +// Write p=2^255-19; q=floor(h/p). +// Basic claim: q = floor(2^(-255)(h + 19 2^(-25)h9 + 2^(-1))). +// +// Proof: +// Have |h|<=p so |q|<=1 so |19^2 2^(-255) q|<1/4. +// Also have |h-2^230 h9|<2^230 so |19 2^(-255)(h-2^230 h9)|<1/4. +// +// Write y=2^(-1)-19^2 2^(-255)q-19 2^(-255)(h-2^230 h9). +// Then 0> 25 + q = (h[0] + q) >> 26 + q = (h[1] + q) >> 25 + q = (h[2] + q) >> 26 + q = (h[3] + q) >> 25 + q = (h[4] + q) >> 26 + q = (h[5] + q) >> 25 + q = (h[6] + q) >> 26 + q = (h[7] + q) >> 25 + q = (h[8] + q) >> 26 + q = (h[9] + q) >> 25 + + // Goal: Output h-(2^255-19)q, which is between 0 and 2^255-20. + h[0] += 19 * q + // Goal: Output h-2^255 q, which is between 0 and 2^255-20. + + carry[0] = h[0] >> 26 + h[1] += carry[0] + h[0] -= carry[0] << 26 + carry[1] = h[1] >> 25 + h[2] += carry[1] + h[1] -= carry[1] << 25 + carry[2] = h[2] >> 26 + h[3] += carry[2] + h[2] -= carry[2] << 26 + carry[3] = h[3] >> 25 + h[4] += carry[3] + h[3] -= carry[3] << 25 + carry[4] = h[4] >> 26 + h[5] += carry[4] + h[4] -= carry[4] << 26 + carry[5] = h[5] >> 25 + h[6] += carry[5] + h[5] -= carry[5] << 25 + carry[6] = h[6] >> 26 + h[7] += carry[6] + h[6] -= carry[6] << 26 + carry[7] = h[7] >> 25 + h[8] += carry[7] + h[7] -= carry[7] << 25 + carry[8] = h[8] >> 26 + h[9] += carry[8] + h[8] -= carry[8] << 26 + carry[9] = h[9] >> 25 + h[9] -= carry[9] << 25 + // h10 = carry9 + + // Goal: Output h[0]+...+2^255 h10-2^255 q, which is between 0 and 2^255-20. + // Have h[0]+...+2^230 h[9] between 0 and 2^255-1; + // evidently 2^255 h10-2^255 q = 0. + // Goal: Output h[0]+...+2^230 h[9]. + + s[0] = byte(h[0] >> 0) + s[1] = byte(h[0] >> 8) + s[2] = byte(h[0] >> 16) + s[3] = byte((h[0] >> 24) | (h[1] << 2)) + s[4] = byte(h[1] >> 6) + s[5] = byte(h[1] >> 14) + s[6] = byte((h[1] >> 22) | (h[2] << 3)) + s[7] = byte(h[2] >> 5) + s[8] = byte(h[2] >> 13) + s[9] = byte((h[2] >> 21) | (h[3] << 5)) + s[10] = byte(h[3] >> 3) + s[11] = byte(h[3] >> 11) + s[12] = byte((h[3] >> 19) | (h[4] << 6)) + s[13] = byte(h[4] >> 2) + s[14] = byte(h[4] >> 10) + s[15] = byte(h[4] >> 18) + s[16] = byte(h[5] >> 0) + s[17] = byte(h[5] >> 8) + s[18] = byte(h[5] >> 16) + s[19] = byte((h[5] >> 24) | (h[6] << 1)) + s[20] = byte(h[6] >> 7) + s[21] = byte(h[6] >> 15) + s[22] = byte((h[6] >> 23) | (h[7] << 3)) + s[23] = byte(h[7] >> 5) + s[24] = byte(h[7] >> 13) + s[25] = byte((h[7] >> 21) | (h[8] << 4)) + s[26] = byte(h[8] >> 4) + s[27] = byte(h[8] >> 12) + s[28] = byte((h[8] >> 20) | (h[9] << 6)) + s[29] = byte(h[9] >> 2) + s[30] = byte(h[9] >> 10) + s[31] = byte(h[9] >> 18) +} + +func FeIsNegative(f *FieldElement) byte { + var s [32]byte + FeToBytes(&s, f) + return s[0] & 1 +} + +func FeIsNonZero(f *FieldElement) int32 { + var s [32]byte + FeToBytes(&s, f) + var x uint8 + for _, b := range s { + x |= b + } + x |= x >> 4 + x |= x >> 2 + x |= x >> 1 + return int32(x & 1) +} + +// FeNeg sets h = -f +// +// Preconditions: +// |f| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +// +// Postconditions: +// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +func FeNeg(h, f *FieldElement) { + h[0] = -f[0] + h[1] = -f[1] + h[2] = -f[2] + h[3] = -f[3] + h[4] = -f[4] + h[5] = -f[5] + h[6] = -f[6] + h[7] = -f[7] + h[8] = -f[8] + h[9] = -f[9] +} + +func FeCombine(h *FieldElement, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) { + var c0, c1, c2, c3, c4, c5, c6, c7, c8, c9 int64 + + /* + |h0| <= (1.1*1.1*2^52*(1+19+19+19+19)+1.1*1.1*2^50*(38+38+38+38+38)) + i.e. |h0| <= 1.2*2^59; narrower ranges for h2, h4, h6, h8 + |h1| <= (1.1*1.1*2^51*(1+1+19+19+19+19+19+19+19+19)) + i.e. |h1| <= 1.5*2^58; narrower ranges for h3, h5, h7, h9 + */ + + c0 = (h0 + (1 << 25)) >> 26 + h1 += c0 + h0 -= c0 << 26 + c4 = (h4 + (1 << 25)) >> 26 + h5 += c4 + h4 -= c4 << 26 + /* |h0| <= 2^25 */ + /* |h4| <= 2^25 */ + /* |h1| <= 1.51*2^58 */ + /* |h5| <= 1.51*2^58 */ + + c1 = (h1 + (1 << 24)) >> 25 + h2 += c1 + h1 -= c1 << 25 + c5 = (h5 + (1 << 24)) >> 25 + h6 += c5 + h5 -= c5 << 25 + /* |h1| <= 2^24; from now on fits into int32 */ + /* |h5| <= 2^24; from now on fits into int32 */ + /* |h2| <= 1.21*2^59 */ + /* |h6| <= 1.21*2^59 */ + + c2 = (h2 + (1 << 25)) >> 26 + h3 += c2 + h2 -= c2 << 26 + c6 = (h6 + (1 << 25)) >> 26 + h7 += c6 + h6 -= c6 << 26 + /* |h2| <= 2^25; from now on fits into int32 unchanged */ + /* |h6| <= 2^25; from now on fits into int32 unchanged */ + /* |h3| <= 1.51*2^58 */ + /* |h7| <= 1.51*2^58 */ + + c3 = (h3 + (1 << 24)) >> 25 + h4 += c3 + h3 -= c3 << 25 + c7 = (h7 + (1 << 24)) >> 25 + h8 += c7 + h7 -= c7 << 25 + /* |h3| <= 2^24; from now on fits into int32 unchanged */ + /* |h7| <= 2^24; from now on fits into int32 unchanged */ + /* |h4| <= 1.52*2^33 */ + /* |h8| <= 1.52*2^33 */ + + c4 = (h4 + (1 << 25)) >> 26 + h5 += c4 + h4 -= c4 << 26 + c8 = (h8 + (1 << 25)) >> 26 + h9 += c8 + h8 -= c8 << 26 + /* |h4| <= 2^25; from now on fits into int32 unchanged */ + /* |h8| <= 2^25; from now on fits into int32 unchanged */ + /* |h5| <= 1.01*2^24 */ + /* |h9| <= 1.51*2^58 */ + + c9 = (h9 + (1 << 24)) >> 25 + h0 += c9 * 19 + h9 -= c9 << 25 + /* |h9| <= 2^24; from now on fits into int32 unchanged */ + /* |h0| <= 1.8*2^37 */ + + c0 = (h0 + (1 << 25)) >> 26 + h1 += c0 + h0 -= c0 << 26 + /* |h0| <= 2^25; from now on fits into int32 unchanged */ + /* |h1| <= 1.01*2^24 */ + + h[0] = int32(h0) + h[1] = int32(h1) + h[2] = int32(h2) + h[3] = int32(h3) + h[4] = int32(h4) + h[5] = int32(h5) + h[6] = int32(h6) + h[7] = int32(h7) + h[8] = int32(h8) + h[9] = int32(h9) +} + +// FeMul calculates h = f * g +// Can overlap h with f or g. +// +// Preconditions: +// |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. +// |g| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. +// +// Postconditions: +// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +// +// Notes on implementation strategy: +// +// Using schoolbook multiplication. +// Karatsuba would save a little in some cost models. +// +// Most multiplications by 2 and 19 are 32-bit precomputations; +// cheaper than 64-bit postcomputations. +// +// There is one remaining multiplication by 19 in the carry chain; +// one *19 precomputation can be merged into this, +// but the resulting data flow is considerably less clean. +// +// There are 12 carries below. +// 10 of them are 2-way parallelizable and vectorizable. +// Can get away with 11 carries, but then data flow is much deeper. +// +// With tighter constraints on inputs, can squeeze carries into int32. +func FeMul(h, f, g *FieldElement) { + f0 := int64(f[0]) + f1 := int64(f[1]) + f2 := int64(f[2]) + f3 := int64(f[3]) + f4 := int64(f[4]) + f5 := int64(f[5]) + f6 := int64(f[6]) + f7 := int64(f[7]) + f8 := int64(f[8]) + f9 := int64(f[9]) + + f1_2 := int64(2 * f[1]) + f3_2 := int64(2 * f[3]) + f5_2 := int64(2 * f[5]) + f7_2 := int64(2 * f[7]) + f9_2 := int64(2 * f[9]) + + g0 := int64(g[0]) + g1 := int64(g[1]) + g2 := int64(g[2]) + g3 := int64(g[3]) + g4 := int64(g[4]) + g5 := int64(g[5]) + g6 := int64(g[6]) + g7 := int64(g[7]) + g8 := int64(g[8]) + g9 := int64(g[9]) + + g1_19 := int64(19 * g[1]) /* 1.4*2^29 */ + g2_19 := int64(19 * g[2]) /* 1.4*2^30; still ok */ + g3_19 := int64(19 * g[3]) + g4_19 := int64(19 * g[4]) + g5_19 := int64(19 * g[5]) + g6_19 := int64(19 * g[6]) + g7_19 := int64(19 * g[7]) + g8_19 := int64(19 * g[8]) + g9_19 := int64(19 * g[9]) + + h0 := f0*g0 + f1_2*g9_19 + f2*g8_19 + f3_2*g7_19 + f4*g6_19 + f5_2*g5_19 + f6*g4_19 + f7_2*g3_19 + f8*g2_19 + f9_2*g1_19 + h1 := f0*g1 + f1*g0 + f2*g9_19 + f3*g8_19 + f4*g7_19 + f5*g6_19 + f6*g5_19 + f7*g4_19 + f8*g3_19 + f9*g2_19 + h2 := f0*g2 + f1_2*g1 + f2*g0 + f3_2*g9_19 + f4*g8_19 + f5_2*g7_19 + f6*g6_19 + f7_2*g5_19 + f8*g4_19 + f9_2*g3_19 + h3 := f0*g3 + f1*g2 + f2*g1 + f3*g0 + f4*g9_19 + f5*g8_19 + f6*g7_19 + f7*g6_19 + f8*g5_19 + f9*g4_19 + h4 := f0*g4 + f1_2*g3 + f2*g2 + f3_2*g1 + f4*g0 + f5_2*g9_19 + f6*g8_19 + f7_2*g7_19 + f8*g6_19 + f9_2*g5_19 + h5 := f0*g5 + f1*g4 + f2*g3 + f3*g2 + f4*g1 + f5*g0 + f6*g9_19 + f7*g8_19 + f8*g7_19 + f9*g6_19 + h6 := f0*g6 + f1_2*g5 + f2*g4 + f3_2*g3 + f4*g2 + f5_2*g1 + f6*g0 + f7_2*g9_19 + f8*g8_19 + f9_2*g7_19 + h7 := f0*g7 + f1*g6 + f2*g5 + f3*g4 + f4*g3 + f5*g2 + f6*g1 + f7*g0 + f8*g9_19 + f9*g8_19 + h8 := f0*g8 + f1_2*g7 + f2*g6 + f3_2*g5 + f4*g4 + f5_2*g3 + f6*g2 + f7_2*g1 + f8*g0 + f9_2*g9_19 + h9 := f0*g9 + f1*g8 + f2*g7 + f3*g6 + f4*g5 + f5*g4 + f6*g3 + f7*g2 + f8*g1 + f9*g0 + + FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9) +} + +func feSquare(f *FieldElement) (h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 int64) { + f0 := int64(f[0]) + f1 := int64(f[1]) + f2 := int64(f[2]) + f3 := int64(f[3]) + f4 := int64(f[4]) + f5 := int64(f[5]) + f6 := int64(f[6]) + f7 := int64(f[7]) + f8 := int64(f[8]) + f9 := int64(f[9]) + f0_2 := int64(2 * f[0]) + f1_2 := int64(2 * f[1]) + f2_2 := int64(2 * f[2]) + f3_2 := int64(2 * f[3]) + f4_2 := int64(2 * f[4]) + f5_2 := int64(2 * f[5]) + f6_2 := int64(2 * f[6]) + f7_2 := int64(2 * f[7]) + f5_38 := 38 * f5 // 1.31*2^30 + f6_19 := 19 * f6 // 1.31*2^30 + f7_38 := 38 * f7 // 1.31*2^30 + f8_19 := 19 * f8 // 1.31*2^30 + f9_38 := 38 * f9 // 1.31*2^30 + + h0 = f0*f0 + f1_2*f9_38 + f2_2*f8_19 + f3_2*f7_38 + f4_2*f6_19 + f5*f5_38 + h1 = f0_2*f1 + f2*f9_38 + f3_2*f8_19 + f4*f7_38 + f5_2*f6_19 + h2 = f0_2*f2 + f1_2*f1 + f3_2*f9_38 + f4_2*f8_19 + f5_2*f7_38 + f6*f6_19 + h3 = f0_2*f3 + f1_2*f2 + f4*f9_38 + f5_2*f8_19 + f6*f7_38 + h4 = f0_2*f4 + f1_2*f3_2 + f2*f2 + f5_2*f9_38 + f6_2*f8_19 + f7*f7_38 + h5 = f0_2*f5 + f1_2*f4 + f2_2*f3 + f6*f9_38 + f7_2*f8_19 + h6 = f0_2*f6 + f1_2*f5_2 + f2_2*f4 + f3_2*f3 + f7_2*f9_38 + f8*f8_19 + h7 = f0_2*f7 + f1_2*f6 + f2_2*f5 + f3_2*f4 + f8*f9_38 + h8 = f0_2*f8 + f1_2*f7_2 + f2_2*f6 + f3_2*f5_2 + f4*f4 + f9*f9_38 + h9 = f0_2*f9 + f1_2*f8 + f2_2*f7 + f3_2*f6 + f4_2*f5 + + return +} + +// FeSquare calculates h = f*f. Can overlap h with f. +// +// Preconditions: +// |f| bounded by 1.1*2^26,1.1*2^25,1.1*2^26,1.1*2^25,etc. +// +// Postconditions: +// |h| bounded by 1.1*2^25,1.1*2^24,1.1*2^25,1.1*2^24,etc. +func FeSquare(h, f *FieldElement) { + h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f) + FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9) +} + +// FeSquare2 sets h = 2 * f * f +// +// Can overlap h with f. +// +// Preconditions: +// |f| bounded by 1.65*2^26,1.65*2^25,1.65*2^26,1.65*2^25,etc. +// +// Postconditions: +// |h| bounded by 1.01*2^25,1.01*2^24,1.01*2^25,1.01*2^24,etc. +// See fe_mul.c for discussion of implementation strategy. +func FeSquare2(h, f *FieldElement) { + h0, h1, h2, h3, h4, h5, h6, h7, h8, h9 := feSquare(f) + + h0 += h0 + h1 += h1 + h2 += h2 + h3 += h3 + h4 += h4 + h5 += h5 + h6 += h6 + h7 += h7 + h8 += h8 + h9 += h9 + + FeCombine(h, h0, h1, h2, h3, h4, h5, h6, h7, h8, h9) +} + +func FeInvert(out, z *FieldElement) { + var t0, t1, t2, t3 FieldElement + var i int + + FeSquare(&t0, z) // 2^1 + FeSquare(&t1, &t0) // 2^2 + for i = 1; i < 2; i++ { // 2^3 + FeSquare(&t1, &t1) + } + FeMul(&t1, z, &t1) // 2^3 + 2^0 + FeMul(&t0, &t0, &t1) // 2^3 + 2^1 + 2^0 + FeSquare(&t2, &t0) // 2^4 + 2^2 + 2^1 + FeMul(&t1, &t1, &t2) // 2^4 + 2^3 + 2^2 + 2^1 + 2^0 + FeSquare(&t2, &t1) // 5,4,3,2,1 + for i = 1; i < 5; i++ { // 9,8,7,6,5 + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) // 9,8,7,6,5,4,3,2,1,0 + FeSquare(&t2, &t1) // 10..1 + for i = 1; i < 10; i++ { // 19..10 + FeSquare(&t2, &t2) + } + FeMul(&t2, &t2, &t1) // 19..0 + FeSquare(&t3, &t2) // 20..1 + for i = 1; i < 20; i++ { // 39..20 + FeSquare(&t3, &t3) + } + FeMul(&t2, &t3, &t2) // 39..0 + FeSquare(&t2, &t2) // 40..1 + for i = 1; i < 10; i++ { // 49..10 + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) // 49..0 + FeSquare(&t2, &t1) // 50..1 + for i = 1; i < 50; i++ { // 99..50 + FeSquare(&t2, &t2) + } + FeMul(&t2, &t2, &t1) // 99..0 + FeSquare(&t3, &t2) // 100..1 + for i = 1; i < 100; i++ { // 199..100 + FeSquare(&t3, &t3) + } + FeMul(&t2, &t3, &t2) // 199..0 + FeSquare(&t2, &t2) // 200..1 + for i = 1; i < 50; i++ { // 249..50 + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) // 249..0 + FeSquare(&t1, &t1) // 250..1 + for i = 1; i < 5; i++ { // 254..5 + FeSquare(&t1, &t1) + } + FeMul(out, &t1, &t0) // 254..5,3,1,0 +} + +func fePow22523(out, z *FieldElement) { + var t0, t1, t2 FieldElement + var i int + + FeSquare(&t0, z) + for i = 1; i < 1; i++ { + FeSquare(&t0, &t0) + } + FeSquare(&t1, &t0) + for i = 1; i < 2; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t1, z, &t1) + FeMul(&t0, &t0, &t1) + FeSquare(&t0, &t0) + for i = 1; i < 1; i++ { + FeSquare(&t0, &t0) + } + FeMul(&t0, &t1, &t0) + FeSquare(&t1, &t0) + for i = 1; i < 5; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t0, &t1, &t0) + FeSquare(&t1, &t0) + for i = 1; i < 10; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t1, &t1, &t0) + FeSquare(&t2, &t1) + for i = 1; i < 20; i++ { + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) + FeSquare(&t1, &t1) + for i = 1; i < 10; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t0, &t1, &t0) + FeSquare(&t1, &t0) + for i = 1; i < 50; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t1, &t1, &t0) + FeSquare(&t2, &t1) + for i = 1; i < 100; i++ { + FeSquare(&t2, &t2) + } + FeMul(&t1, &t2, &t1) + FeSquare(&t1, &t1) + for i = 1; i < 50; i++ { + FeSquare(&t1, &t1) + } + FeMul(&t0, &t1, &t0) + FeSquare(&t0, &t0) + for i = 1; i < 2; i++ { + FeSquare(&t0, &t0) + } + FeMul(out, &t0, z) +} + +// Group elements are members of the elliptic curve -x^2 + y^2 = 1 + d * x^2 * +// y^2 where d = -121665/121666. +// +// Several representations are used: +// ProjectiveGroupElement: (X:Y:Z) satisfying x=X/Z, y=Y/Z +// ExtendedGroupElement: (X:Y:Z:T) satisfying x=X/Z, y=Y/Z, XY=ZT +// CompletedGroupElement: ((X:Z),(Y:T)) satisfying x=X/Z, y=Y/T +// PreComputedGroupElement: (y+x,y-x,2dxy) + +type ProjectiveGroupElement struct { + X, Y, Z FieldElement +} + +type ExtendedGroupElement struct { + X, Y, Z, T FieldElement +} + +type CompletedGroupElement struct { + X, Y, Z, T FieldElement +} + +type PreComputedGroupElement struct { + yPlusX, yMinusX, xy2d FieldElement +} + +type CachedGroupElement struct { + yPlusX, yMinusX, Z, T2d FieldElement +} + +func (p *ProjectiveGroupElement) Zero() { + FeZero(&p.X) + FeOne(&p.Y) + FeOne(&p.Z) +} + +func (p *ProjectiveGroupElement) Double(r *CompletedGroupElement) { + var t0 FieldElement + + FeSquare(&r.X, &p.X) + FeSquare(&r.Z, &p.Y) + FeSquare2(&r.T, &p.Z) + FeAdd(&r.Y, &p.X, &p.Y) + FeSquare(&t0, &r.Y) + FeAdd(&r.Y, &r.Z, &r.X) + FeSub(&r.Z, &r.Z, &r.X) + FeSub(&r.X, &t0, &r.Y) + FeSub(&r.T, &r.T, &r.Z) +} + +func (p *ProjectiveGroupElement) ToBytes(s *[32]byte) { + var recip, x, y FieldElement + + FeInvert(&recip, &p.Z) + FeMul(&x, &p.X, &recip) + FeMul(&y, &p.Y, &recip) + FeToBytes(s, &y) + s[31] ^= FeIsNegative(&x) << 7 +} + +func (p *ExtendedGroupElement) Zero() { + FeZero(&p.X) + FeOne(&p.Y) + FeOne(&p.Z) + FeZero(&p.T) +} + +func (p *ExtendedGroupElement) Double(r *CompletedGroupElement) { + var q ProjectiveGroupElement + p.ToProjective(&q) + q.Double(r) +} + +func (p *ExtendedGroupElement) ToCached(r *CachedGroupElement) { + FeAdd(&r.yPlusX, &p.Y, &p.X) + FeSub(&r.yMinusX, &p.Y, &p.X) + FeCopy(&r.Z, &p.Z) + FeMul(&r.T2d, &p.T, &d2) +} + +func (p *ExtendedGroupElement) ToProjective(r *ProjectiveGroupElement) { + FeCopy(&r.X, &p.X) + FeCopy(&r.Y, &p.Y) + FeCopy(&r.Z, &p.Z) +} + +func (p *ExtendedGroupElement) ToBytes(s *[32]byte) { + var recip, x, y FieldElement + + FeInvert(&recip, &p.Z) + FeMul(&x, &p.X, &recip) + FeMul(&y, &p.Y, &recip) + FeToBytes(s, &y) + s[31] ^= FeIsNegative(&x) << 7 +} + +func (p *ExtendedGroupElement) FromBytes(s *[32]byte) bool { + var u, v, v3, vxx, check FieldElement + + FeFromBytes(&p.Y, s) + FeOne(&p.Z) + FeSquare(&u, &p.Y) + FeMul(&v, &u, &d) + FeSub(&u, &u, &p.Z) // y = y^2-1 + FeAdd(&v, &v, &p.Z) // v = dy^2+1 + + FeSquare(&v3, &v) + FeMul(&v3, &v3, &v) // v3 = v^3 + FeSquare(&p.X, &v3) + FeMul(&p.X, &p.X, &v) + FeMul(&p.X, &p.X, &u) // x = uv^7 + + fePow22523(&p.X, &p.X) // x = (uv^7)^((q-5)/8) + FeMul(&p.X, &p.X, &v3) + FeMul(&p.X, &p.X, &u) // x = uv^3(uv^7)^((q-5)/8) + + var tmpX, tmp2 [32]byte + + FeSquare(&vxx, &p.X) + FeMul(&vxx, &vxx, &v) + FeSub(&check, &vxx, &u) // vx^2-u + if FeIsNonZero(&check) == 1 { + FeAdd(&check, &vxx, &u) // vx^2+u + if FeIsNonZero(&check) == 1 { + return false + } + FeMul(&p.X, &p.X, &SqrtM1) + + FeToBytes(&tmpX, &p.X) + for i, v := range tmpX { + tmp2[31-i] = v + } + } + + if FeIsNegative(&p.X) != (s[31] >> 7) { + FeNeg(&p.X, &p.X) + } + + FeMul(&p.T, &p.X, &p.Y) + return true +} + +func (p *CompletedGroupElement) ToProjective(r *ProjectiveGroupElement) { + FeMul(&r.X, &p.X, &p.T) + FeMul(&r.Y, &p.Y, &p.Z) + FeMul(&r.Z, &p.Z, &p.T) +} + +func (p *CompletedGroupElement) ToExtended(r *ExtendedGroupElement) { + FeMul(&r.X, &p.X, &p.T) + FeMul(&r.Y, &p.Y, &p.Z) + FeMul(&r.Z, &p.Z, &p.T) + FeMul(&r.T, &p.X, &p.Y) +} + +func (p *PreComputedGroupElement) Zero() { + FeOne(&p.yPlusX) + FeOne(&p.yMinusX) + FeZero(&p.xy2d) +} + +func geAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) { + var t0 FieldElement + + FeAdd(&r.X, &p.Y, &p.X) + FeSub(&r.Y, &p.Y, &p.X) + FeMul(&r.Z, &r.X, &q.yPlusX) + FeMul(&r.Y, &r.Y, &q.yMinusX) + FeMul(&r.T, &q.T2d, &p.T) + FeMul(&r.X, &p.Z, &q.Z) + FeAdd(&t0, &r.X, &r.X) + FeSub(&r.X, &r.Z, &r.Y) + FeAdd(&r.Y, &r.Z, &r.Y) + FeAdd(&r.Z, &t0, &r.T) + FeSub(&r.T, &t0, &r.T) +} + +func geSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *CachedGroupElement) { + var t0 FieldElement + + FeAdd(&r.X, &p.Y, &p.X) + FeSub(&r.Y, &p.Y, &p.X) + FeMul(&r.Z, &r.X, &q.yMinusX) + FeMul(&r.Y, &r.Y, &q.yPlusX) + FeMul(&r.T, &q.T2d, &p.T) + FeMul(&r.X, &p.Z, &q.Z) + FeAdd(&t0, &r.X, &r.X) + FeSub(&r.X, &r.Z, &r.Y) + FeAdd(&r.Y, &r.Z, &r.Y) + FeSub(&r.Z, &t0, &r.T) + FeAdd(&r.T, &t0, &r.T) +} + +func geMixedAdd(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) { + var t0 FieldElement + + FeAdd(&r.X, &p.Y, &p.X) + FeSub(&r.Y, &p.Y, &p.X) + FeMul(&r.Z, &r.X, &q.yPlusX) + FeMul(&r.Y, &r.Y, &q.yMinusX) + FeMul(&r.T, &q.xy2d, &p.T) + FeAdd(&t0, &p.Z, &p.Z) + FeSub(&r.X, &r.Z, &r.Y) + FeAdd(&r.Y, &r.Z, &r.Y) + FeAdd(&r.Z, &t0, &r.T) + FeSub(&r.T, &t0, &r.T) +} + +func geMixedSub(r *CompletedGroupElement, p *ExtendedGroupElement, q *PreComputedGroupElement) { + var t0 FieldElement + + FeAdd(&r.X, &p.Y, &p.X) + FeSub(&r.Y, &p.Y, &p.X) + FeMul(&r.Z, &r.X, &q.yMinusX) + FeMul(&r.Y, &r.Y, &q.yPlusX) + FeMul(&r.T, &q.xy2d, &p.T) + FeAdd(&t0, &p.Z, &p.Z) + FeSub(&r.X, &r.Z, &r.Y) + FeAdd(&r.Y, &r.Z, &r.Y) + FeSub(&r.Z, &t0, &r.T) + FeAdd(&r.T, &t0, &r.T) +} + +func slide(r *[256]int8, a *[32]byte) { + for i := range r { + r[i] = int8(1 & (a[i>>3] >> uint(i&7))) + } + + for i := range r { + if r[i] != 0 { + for b := 1; b <= 6 && i+b < 256; b++ { + if r[i+b] != 0 { + if r[i]+(r[i+b]<= -15 { + r[i] -= r[i+b] << uint(b) + for k := i + b; k < 256; k++ { + if r[k] == 0 { + r[k] = 1 + break + } + r[k] = 0 + } + } else { + break + } + } + } + } + } +} + +// GeDoubleScalarMultVartime sets r = a*A + b*B +// where a = a[0]+256*a[1]+...+256^31 a[31]. +// and b = b[0]+256*b[1]+...+256^31 b[31]. +// B is the Ed25519 base point (x,4/5) with x positive. +func GeDoubleScalarMultVartime(r *ProjectiveGroupElement, a *[32]byte, A *ExtendedGroupElement, b *[32]byte) { + var aSlide, bSlide [256]int8 + var Ai [8]CachedGroupElement // A,3A,5A,7A,9A,11A,13A,15A + var t CompletedGroupElement + var u, A2 ExtendedGroupElement + var i int + + slide(&aSlide, a) + slide(&bSlide, b) + + A.ToCached(&Ai[0]) + A.Double(&t) + t.ToExtended(&A2) + + for i := 0; i < 7; i++ { + geAdd(&t, &A2, &Ai[i]) + t.ToExtended(&u) + u.ToCached(&Ai[i+1]) + } + + r.Zero() + + for i = 255; i >= 0; i-- { + if aSlide[i] != 0 || bSlide[i] != 0 { + break + } + } + + for ; i >= 0; i-- { + r.Double(&t) + + if aSlide[i] > 0 { + t.ToExtended(&u) + geAdd(&t, &u, &Ai[aSlide[i]/2]) + } else if aSlide[i] < 0 { + t.ToExtended(&u) + geSub(&t, &u, &Ai[(-aSlide[i])/2]) + } + + if bSlide[i] > 0 { + t.ToExtended(&u) + geMixedAdd(&t, &u, &bi[bSlide[i]/2]) + } else if bSlide[i] < 0 { + t.ToExtended(&u) + geMixedSub(&t, &u, &bi[(-bSlide[i])/2]) + } + + t.ToProjective(r) + } +} + +// equal returns 1 if b == c and 0 otherwise, assuming that b and c are +// non-negative. +func equal(b, c int32) int32 { + x := uint32(b ^ c) + x-- + return int32(x >> 31) +} + +// negative returns 1 if b < 0 and 0 otherwise. +func negative(b int32) int32 { + return (b >> 31) & 1 +} + +func PreComputedGroupElementCMove(t, u *PreComputedGroupElement, b int32) { + FeCMove(&t.yPlusX, &u.yPlusX, b) + FeCMove(&t.yMinusX, &u.yMinusX, b) + FeCMove(&t.xy2d, &u.xy2d, b) +} + +func selectPoint(t *PreComputedGroupElement, pos int32, b int32) { + var minusT PreComputedGroupElement + bNegative := negative(b) + bAbs := b - (((-bNegative) & b) << 1) + + t.Zero() + for i := int32(0); i < 8; i++ { + PreComputedGroupElementCMove(t, &base[pos][i], equal(bAbs, i+1)) + } + FeCopy(&minusT.yPlusX, &t.yMinusX) + FeCopy(&minusT.yMinusX, &t.yPlusX) + FeNeg(&minusT.xy2d, &t.xy2d) + PreComputedGroupElementCMove(t, &minusT, bNegative) +} + +// GeScalarMultBase computes h = a*B, where +// a = a[0]+256*a[1]+...+256^31 a[31] +// B is the Ed25519 base point (x,4/5) with x positive. +// +// Preconditions: +// a[31] <= 127 +func GeScalarMultBase(h *ExtendedGroupElement, a *[32]byte) { + var e [64]int8 + + for i, v := range a { + e[2*i] = int8(v & 15) + e[2*i+1] = int8((v >> 4) & 15) + } + + // each e[i] is between 0 and 15 and e[63] is between 0 and 7. + + carry := int8(0) + for i := 0; i < 63; i++ { + e[i] += carry + carry = (e[i] + 8) >> 4 + e[i] -= carry << 4 + } + e[63] += carry + // each e[i] is between -8 and 8. + + h.Zero() + var t PreComputedGroupElement + var r CompletedGroupElement + for i := int32(1); i < 64; i += 2 { + selectPoint(&t, i/2, int32(e[i])) + geMixedAdd(&r, h, &t) + r.ToExtended(h) + } + + var s ProjectiveGroupElement + + h.Double(&r) + r.ToProjective(&s) + s.Double(&r) + r.ToProjective(&s) + s.Double(&r) + r.ToProjective(&s) + s.Double(&r) + r.ToExtended(h) + + for i := int32(0); i < 64; i += 2 { + selectPoint(&t, i/2, int32(e[i])) + geMixedAdd(&r, h, &t) + r.ToExtended(h) + } +} + +// The scalars are GF(2^252 + 27742317777372353535851937790883648493). + +// Input: +// a[0]+256*a[1]+...+256^31*a[31] = a +// b[0]+256*b[1]+...+256^31*b[31] = b +// c[0]+256*c[1]+...+256^31*c[31] = c +// +// Output: +// s[0]+256*s[1]+...+256^31*s[31] = (ab+c) mod l +// where l = 2^252 + 27742317777372353535851937790883648493. +func ScMulAdd(s, a, b, c *[32]byte) { + a0 := 2097151 & load3(a[:]) + a1 := 2097151 & (load4(a[2:]) >> 5) + a2 := 2097151 & (load3(a[5:]) >> 2) + a3 := 2097151 & (load4(a[7:]) >> 7) + a4 := 2097151 & (load4(a[10:]) >> 4) + a5 := 2097151 & (load3(a[13:]) >> 1) + a6 := 2097151 & (load4(a[15:]) >> 6) + a7 := 2097151 & (load3(a[18:]) >> 3) + a8 := 2097151 & load3(a[21:]) + a9 := 2097151 & (load4(a[23:]) >> 5) + a10 := 2097151 & (load3(a[26:]) >> 2) + a11 := (load4(a[28:]) >> 7) + b0 := 2097151 & load3(b[:]) + b1 := 2097151 & (load4(b[2:]) >> 5) + b2 := 2097151 & (load3(b[5:]) >> 2) + b3 := 2097151 & (load4(b[7:]) >> 7) + b4 := 2097151 & (load4(b[10:]) >> 4) + b5 := 2097151 & (load3(b[13:]) >> 1) + b6 := 2097151 & (load4(b[15:]) >> 6) + b7 := 2097151 & (load3(b[18:]) >> 3) + b8 := 2097151 & load3(b[21:]) + b9 := 2097151 & (load4(b[23:]) >> 5) + b10 := 2097151 & (load3(b[26:]) >> 2) + b11 := (load4(b[28:]) >> 7) + c0 := 2097151 & load3(c[:]) + c1 := 2097151 & (load4(c[2:]) >> 5) + c2 := 2097151 & (load3(c[5:]) >> 2) + c3 := 2097151 & (load4(c[7:]) >> 7) + c4 := 2097151 & (load4(c[10:]) >> 4) + c5 := 2097151 & (load3(c[13:]) >> 1) + c6 := 2097151 & (load4(c[15:]) >> 6) + c7 := 2097151 & (load3(c[18:]) >> 3) + c8 := 2097151 & load3(c[21:]) + c9 := 2097151 & (load4(c[23:]) >> 5) + c10 := 2097151 & (load3(c[26:]) >> 2) + c11 := (load4(c[28:]) >> 7) + var carry [23]int64 + + s0 := c0 + a0*b0 + s1 := c1 + a0*b1 + a1*b0 + s2 := c2 + a0*b2 + a1*b1 + a2*b0 + s3 := c3 + a0*b3 + a1*b2 + a2*b1 + a3*b0 + s4 := c4 + a0*b4 + a1*b3 + a2*b2 + a3*b1 + a4*b0 + s5 := c5 + a0*b5 + a1*b4 + a2*b3 + a3*b2 + a4*b1 + a5*b0 + s6 := c6 + a0*b6 + a1*b5 + a2*b4 + a3*b3 + a4*b2 + a5*b1 + a6*b0 + s7 := c7 + a0*b7 + a1*b6 + a2*b5 + a3*b4 + a4*b3 + a5*b2 + a6*b1 + a7*b0 + s8 := c8 + a0*b8 + a1*b7 + a2*b6 + a3*b5 + a4*b4 + a5*b3 + a6*b2 + a7*b1 + a8*b0 + s9 := c9 + a0*b9 + a1*b8 + a2*b7 + a3*b6 + a4*b5 + a5*b4 + a6*b3 + a7*b2 + a8*b1 + a9*b0 + s10 := c10 + a0*b10 + a1*b9 + a2*b8 + a3*b7 + a4*b6 + a5*b5 + a6*b4 + a7*b3 + a8*b2 + a9*b1 + a10*b0 + s11 := c11 + a0*b11 + a1*b10 + a2*b9 + a3*b8 + a4*b7 + a5*b6 + a6*b5 + a7*b4 + a8*b3 + a9*b2 + a10*b1 + a11*b0 + s12 := a1*b11 + a2*b10 + a3*b9 + a4*b8 + a5*b7 + a6*b6 + a7*b5 + a8*b4 + a9*b3 + a10*b2 + a11*b1 + s13 := a2*b11 + a3*b10 + a4*b9 + a5*b8 + a6*b7 + a7*b6 + a8*b5 + a9*b4 + a10*b3 + a11*b2 + s14 := a3*b11 + a4*b10 + a5*b9 + a6*b8 + a7*b7 + a8*b6 + a9*b5 + a10*b4 + a11*b3 + s15 := a4*b11 + a5*b10 + a6*b9 + a7*b8 + a8*b7 + a9*b6 + a10*b5 + a11*b4 + s16 := a5*b11 + a6*b10 + a7*b9 + a8*b8 + a9*b7 + a10*b6 + a11*b5 + s17 := a6*b11 + a7*b10 + a8*b9 + a9*b8 + a10*b7 + a11*b6 + s18 := a7*b11 + a8*b10 + a9*b9 + a10*b8 + a11*b7 + s19 := a8*b11 + a9*b10 + a10*b9 + a11*b8 + s20 := a9*b11 + a10*b10 + a11*b9 + s21 := a10*b11 + a11*b10 + s22 := a11 * b11 + s23 := int64(0) + + carry[0] = (s0 + (1 << 20)) >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[2] = (s2 + (1 << 20)) >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[4] = (s4 + (1 << 20)) >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[12] = (s12 + (1 << 20)) >> 21 + s13 += carry[12] + s12 -= carry[12] << 21 + carry[14] = (s14 + (1 << 20)) >> 21 + s15 += carry[14] + s14 -= carry[14] << 21 + carry[16] = (s16 + (1 << 20)) >> 21 + s17 += carry[16] + s16 -= carry[16] << 21 + carry[18] = (s18 + (1 << 20)) >> 21 + s19 += carry[18] + s18 -= carry[18] << 21 + carry[20] = (s20 + (1 << 20)) >> 21 + s21 += carry[20] + s20 -= carry[20] << 21 + carry[22] = (s22 + (1 << 20)) >> 21 + s23 += carry[22] + s22 -= carry[22] << 21 + + carry[1] = (s1 + (1 << 20)) >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[3] = (s3 + (1 << 20)) >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[5] = (s5 + (1 << 20)) >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + carry[13] = (s13 + (1 << 20)) >> 21 + s14 += carry[13] + s13 -= carry[13] << 21 + carry[15] = (s15 + (1 << 20)) >> 21 + s16 += carry[15] + s15 -= carry[15] << 21 + carry[17] = (s17 + (1 << 20)) >> 21 + s18 += carry[17] + s17 -= carry[17] << 21 + carry[19] = (s19 + (1 << 20)) >> 21 + s20 += carry[19] + s19 -= carry[19] << 21 + carry[21] = (s21 + (1 << 20)) >> 21 + s22 += carry[21] + s21 -= carry[21] << 21 + + s11 += s23 * 666643 + s12 += s23 * 470296 + s13 += s23 * 654183 + s14 -= s23 * 997805 + s15 += s23 * 136657 + s16 -= s23 * 683901 + s23 = 0 + + s10 += s22 * 666643 + s11 += s22 * 470296 + s12 += s22 * 654183 + s13 -= s22 * 997805 + s14 += s22 * 136657 + s15 -= s22 * 683901 + s22 = 0 + + s9 += s21 * 666643 + s10 += s21 * 470296 + s11 += s21 * 654183 + s12 -= s21 * 997805 + s13 += s21 * 136657 + s14 -= s21 * 683901 + s21 = 0 + + s8 += s20 * 666643 + s9 += s20 * 470296 + s10 += s20 * 654183 + s11 -= s20 * 997805 + s12 += s20 * 136657 + s13 -= s20 * 683901 + s20 = 0 + + s7 += s19 * 666643 + s8 += s19 * 470296 + s9 += s19 * 654183 + s10 -= s19 * 997805 + s11 += s19 * 136657 + s12 -= s19 * 683901 + s19 = 0 + + s6 += s18 * 666643 + s7 += s18 * 470296 + s8 += s18 * 654183 + s9 -= s18 * 997805 + s10 += s18 * 136657 + s11 -= s18 * 683901 + s18 = 0 + + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[12] = (s12 + (1 << 20)) >> 21 + s13 += carry[12] + s12 -= carry[12] << 21 + carry[14] = (s14 + (1 << 20)) >> 21 + s15 += carry[14] + s14 -= carry[14] << 21 + carry[16] = (s16 + (1 << 20)) >> 21 + s17 += carry[16] + s16 -= carry[16] << 21 + + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + carry[13] = (s13 + (1 << 20)) >> 21 + s14 += carry[13] + s13 -= carry[13] << 21 + carry[15] = (s15 + (1 << 20)) >> 21 + s16 += carry[15] + s15 -= carry[15] << 21 + + s5 += s17 * 666643 + s6 += s17 * 470296 + s7 += s17 * 654183 + s8 -= s17 * 997805 + s9 += s17 * 136657 + s10 -= s17 * 683901 + s17 = 0 + + s4 += s16 * 666643 + s5 += s16 * 470296 + s6 += s16 * 654183 + s7 -= s16 * 997805 + s8 += s16 * 136657 + s9 -= s16 * 683901 + s16 = 0 + + s3 += s15 * 666643 + s4 += s15 * 470296 + s5 += s15 * 654183 + s6 -= s15 * 997805 + s7 += s15 * 136657 + s8 -= s15 * 683901 + s15 = 0 + + s2 += s14 * 666643 + s3 += s14 * 470296 + s4 += s14 * 654183 + s5 -= s14 * 997805 + s6 += s14 * 136657 + s7 -= s14 * 683901 + s14 = 0 + + s1 += s13 * 666643 + s2 += s13 * 470296 + s3 += s13 * 654183 + s4 -= s13 * 997805 + s5 += s13 * 136657 + s6 -= s13 * 683901 + s13 = 0 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = (s0 + (1 << 20)) >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[2] = (s2 + (1 << 20)) >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[4] = (s4 + (1 << 20)) >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + + carry[1] = (s1 + (1 << 20)) >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[3] = (s3 + (1 << 20)) >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[5] = (s5 + (1 << 20)) >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = s0 >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[1] = s1 >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[2] = s2 >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[3] = s3 >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[4] = s4 >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[5] = s5 >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[6] = s6 >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[7] = s7 >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[8] = s8 >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[9] = s9 >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[10] = s10 >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[11] = s11 >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = s0 >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[1] = s1 >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[2] = s2 >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[3] = s3 >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[4] = s4 >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[5] = s5 >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[6] = s6 >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[7] = s7 >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[8] = s8 >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[9] = s9 >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[10] = s10 >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + + s[0] = byte(s0 >> 0) + s[1] = byte(s0 >> 8) + s[2] = byte((s0 >> 16) | (s1 << 5)) + s[3] = byte(s1 >> 3) + s[4] = byte(s1 >> 11) + s[5] = byte((s1 >> 19) | (s2 << 2)) + s[6] = byte(s2 >> 6) + s[7] = byte((s2 >> 14) | (s3 << 7)) + s[8] = byte(s3 >> 1) + s[9] = byte(s3 >> 9) + s[10] = byte((s3 >> 17) | (s4 << 4)) + s[11] = byte(s4 >> 4) + s[12] = byte(s4 >> 12) + s[13] = byte((s4 >> 20) | (s5 << 1)) + s[14] = byte(s5 >> 7) + s[15] = byte((s5 >> 15) | (s6 << 6)) + s[16] = byte(s6 >> 2) + s[17] = byte(s6 >> 10) + s[18] = byte((s6 >> 18) | (s7 << 3)) + s[19] = byte(s7 >> 5) + s[20] = byte(s7 >> 13) + s[21] = byte(s8 >> 0) + s[22] = byte(s8 >> 8) + s[23] = byte((s8 >> 16) | (s9 << 5)) + s[24] = byte(s9 >> 3) + s[25] = byte(s9 >> 11) + s[26] = byte((s9 >> 19) | (s10 << 2)) + s[27] = byte(s10 >> 6) + s[28] = byte((s10 >> 14) | (s11 << 7)) + s[29] = byte(s11 >> 1) + s[30] = byte(s11 >> 9) + s[31] = byte(s11 >> 17) +} + +// Input: +// s[0]+256*s[1]+...+256^63*s[63] = s +// +// Output: +// s[0]+256*s[1]+...+256^31*s[31] = s mod l +// where l = 2^252 + 27742317777372353535851937790883648493. +func ScReduce(out *[32]byte, s *[64]byte) { + s0 := 2097151 & load3(s[:]) + s1 := 2097151 & (load4(s[2:]) >> 5) + s2 := 2097151 & (load3(s[5:]) >> 2) + s3 := 2097151 & (load4(s[7:]) >> 7) + s4 := 2097151 & (load4(s[10:]) >> 4) + s5 := 2097151 & (load3(s[13:]) >> 1) + s6 := 2097151 & (load4(s[15:]) >> 6) + s7 := 2097151 & (load3(s[18:]) >> 3) + s8 := 2097151 & load3(s[21:]) + s9 := 2097151 & (load4(s[23:]) >> 5) + s10 := 2097151 & (load3(s[26:]) >> 2) + s11 := 2097151 & (load4(s[28:]) >> 7) + s12 := 2097151 & (load4(s[31:]) >> 4) + s13 := 2097151 & (load3(s[34:]) >> 1) + s14 := 2097151 & (load4(s[36:]) >> 6) + s15 := 2097151 & (load3(s[39:]) >> 3) + s16 := 2097151 & load3(s[42:]) + s17 := 2097151 & (load4(s[44:]) >> 5) + s18 := 2097151 & (load3(s[47:]) >> 2) + s19 := 2097151 & (load4(s[49:]) >> 7) + s20 := 2097151 & (load4(s[52:]) >> 4) + s21 := 2097151 & (load3(s[55:]) >> 1) + s22 := 2097151 & (load4(s[57:]) >> 6) + s23 := (load4(s[60:]) >> 3) + + s11 += s23 * 666643 + s12 += s23 * 470296 + s13 += s23 * 654183 + s14 -= s23 * 997805 + s15 += s23 * 136657 + s16 -= s23 * 683901 + s23 = 0 + + s10 += s22 * 666643 + s11 += s22 * 470296 + s12 += s22 * 654183 + s13 -= s22 * 997805 + s14 += s22 * 136657 + s15 -= s22 * 683901 + s22 = 0 + + s9 += s21 * 666643 + s10 += s21 * 470296 + s11 += s21 * 654183 + s12 -= s21 * 997805 + s13 += s21 * 136657 + s14 -= s21 * 683901 + s21 = 0 + + s8 += s20 * 666643 + s9 += s20 * 470296 + s10 += s20 * 654183 + s11 -= s20 * 997805 + s12 += s20 * 136657 + s13 -= s20 * 683901 + s20 = 0 + + s7 += s19 * 666643 + s8 += s19 * 470296 + s9 += s19 * 654183 + s10 -= s19 * 997805 + s11 += s19 * 136657 + s12 -= s19 * 683901 + s19 = 0 + + s6 += s18 * 666643 + s7 += s18 * 470296 + s8 += s18 * 654183 + s9 -= s18 * 997805 + s10 += s18 * 136657 + s11 -= s18 * 683901 + s18 = 0 + + var carry [17]int64 + + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[12] = (s12 + (1 << 20)) >> 21 + s13 += carry[12] + s12 -= carry[12] << 21 + carry[14] = (s14 + (1 << 20)) >> 21 + s15 += carry[14] + s14 -= carry[14] << 21 + carry[16] = (s16 + (1 << 20)) >> 21 + s17 += carry[16] + s16 -= carry[16] << 21 + + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + carry[13] = (s13 + (1 << 20)) >> 21 + s14 += carry[13] + s13 -= carry[13] << 21 + carry[15] = (s15 + (1 << 20)) >> 21 + s16 += carry[15] + s15 -= carry[15] << 21 + + s5 += s17 * 666643 + s6 += s17 * 470296 + s7 += s17 * 654183 + s8 -= s17 * 997805 + s9 += s17 * 136657 + s10 -= s17 * 683901 + s17 = 0 + + s4 += s16 * 666643 + s5 += s16 * 470296 + s6 += s16 * 654183 + s7 -= s16 * 997805 + s8 += s16 * 136657 + s9 -= s16 * 683901 + s16 = 0 + + s3 += s15 * 666643 + s4 += s15 * 470296 + s5 += s15 * 654183 + s6 -= s15 * 997805 + s7 += s15 * 136657 + s8 -= s15 * 683901 + s15 = 0 + + s2 += s14 * 666643 + s3 += s14 * 470296 + s4 += s14 * 654183 + s5 -= s14 * 997805 + s6 += s14 * 136657 + s7 -= s14 * 683901 + s14 = 0 + + s1 += s13 * 666643 + s2 += s13 * 470296 + s3 += s13 * 654183 + s4 -= s13 * 997805 + s5 += s13 * 136657 + s6 -= s13 * 683901 + s13 = 0 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = (s0 + (1 << 20)) >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[2] = (s2 + (1 << 20)) >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[4] = (s4 + (1 << 20)) >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[6] = (s6 + (1 << 20)) >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[8] = (s8 + (1 << 20)) >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[10] = (s10 + (1 << 20)) >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + + carry[1] = (s1 + (1 << 20)) >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[3] = (s3 + (1 << 20)) >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[5] = (s5 + (1 << 20)) >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[7] = (s7 + (1 << 20)) >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[9] = (s9 + (1 << 20)) >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[11] = (s11 + (1 << 20)) >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = s0 >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[1] = s1 >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[2] = s2 >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[3] = s3 >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[4] = s4 >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[5] = s5 >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[6] = s6 >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[7] = s7 >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[8] = s8 >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[9] = s9 >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[10] = s10 >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + carry[11] = s11 >> 21 + s12 += carry[11] + s11 -= carry[11] << 21 + + s0 += s12 * 666643 + s1 += s12 * 470296 + s2 += s12 * 654183 + s3 -= s12 * 997805 + s4 += s12 * 136657 + s5 -= s12 * 683901 + s12 = 0 + + carry[0] = s0 >> 21 + s1 += carry[0] + s0 -= carry[0] << 21 + carry[1] = s1 >> 21 + s2 += carry[1] + s1 -= carry[1] << 21 + carry[2] = s2 >> 21 + s3 += carry[2] + s2 -= carry[2] << 21 + carry[3] = s3 >> 21 + s4 += carry[3] + s3 -= carry[3] << 21 + carry[4] = s4 >> 21 + s5 += carry[4] + s4 -= carry[4] << 21 + carry[5] = s5 >> 21 + s6 += carry[5] + s5 -= carry[5] << 21 + carry[6] = s6 >> 21 + s7 += carry[6] + s6 -= carry[6] << 21 + carry[7] = s7 >> 21 + s8 += carry[7] + s7 -= carry[7] << 21 + carry[8] = s8 >> 21 + s9 += carry[8] + s8 -= carry[8] << 21 + carry[9] = s9 >> 21 + s10 += carry[9] + s9 -= carry[9] << 21 + carry[10] = s10 >> 21 + s11 += carry[10] + s10 -= carry[10] << 21 + + out[0] = byte(s0 >> 0) + out[1] = byte(s0 >> 8) + out[2] = byte((s0 >> 16) | (s1 << 5)) + out[3] = byte(s1 >> 3) + out[4] = byte(s1 >> 11) + out[5] = byte((s1 >> 19) | (s2 << 2)) + out[6] = byte(s2 >> 6) + out[7] = byte((s2 >> 14) | (s3 << 7)) + out[8] = byte(s3 >> 1) + out[9] = byte(s3 >> 9) + out[10] = byte((s3 >> 17) | (s4 << 4)) + out[11] = byte(s4 >> 4) + out[12] = byte(s4 >> 12) + out[13] = byte((s4 >> 20) | (s5 << 1)) + out[14] = byte(s5 >> 7) + out[15] = byte((s5 >> 15) | (s6 << 6)) + out[16] = byte(s6 >> 2) + out[17] = byte(s6 >> 10) + out[18] = byte((s6 >> 18) | (s7 << 3)) + out[19] = byte(s7 >> 5) + out[20] = byte(s7 >> 13) + out[21] = byte(s8 >> 0) + out[22] = byte(s8 >> 8) + out[23] = byte((s8 >> 16) | (s9 << 5)) + out[24] = byte(s9 >> 3) + out[25] = byte(s9 >> 11) + out[26] = byte((s9 >> 19) | (s10 << 2)) + out[27] = byte(s10 >> 6) + out[28] = byte((s10 >> 14) | (s11 << 7)) + out[29] = byte(s11 >> 1) + out[30] = byte(s11 >> 9) + out[31] = byte(s11 >> 17) +} diff --git a/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go b/vendor/golang.org/x/crypto/pbkdf2/pbkdf2.go new file mode 100644 index 00000000..593f6530 --- /dev/null +++ b/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] +} diff --git a/vendor/gopkg.in/square/go-jose.v2/asymmetric.go b/vendor/gopkg.in/square/go-jose.v2/asymmetric.go index b238b4ad..5272648f 100644 --- a/vendor/gopkg.in/square/go-jose.v2/asymmetric.go +++ b/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{ - Key: &privateKey.PublicKey, - }, + publicKey: staticPublicKey(&JSONWebKey{ + 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{ - Key: &privateKey.PublicKey, - }, + publicKey: staticPublicKey(&JSONWebKey{ + 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{ - Key: &priv.PublicKey, - }, + headerEPK: makeRawMessage(b), } 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() - apvData := headers.Apv.bytes() + apuData, err := headers.getAPU() + 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() diff --git a/vendor/gopkg.in/square/go-jose.v2/cipher/ecdh_es.go b/vendor/gopkg.in/square/go-jose.v2/cipher/ecdh_es.go index f23d49e1..c128e327 100644 --- a/vendor/gopkg.in/square/go-jose.v2/cipher/ecdh_es.go +++ b/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 diff --git a/vendor/gopkg.in/square/go-jose.v2/crypter.go b/vendor/gopkg.in/square/go-jose.v2/crypter.go index bc7e043b..9ee44f8b 100644 --- a/vendor/gopkg.in/square/go-jose.v2/crypter.go +++ b/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 - Key interface{} - KeyID string + Algorithm KeyAlgorithm + Key interface{} + 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 - rawKey = encryptionKey.Key + keyID, rawKey = encryptionKey.KeyID, 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{ - Enc: ctx.contentAlg, + obj.protected = &rawHeader{} + 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 != "" { - plaintext, err = decompress(obj.protected.Zip, plaintext) + if comp := obj.protected.getCompression(); comp != "" { + 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 != "" { - plaintext, err = decompress(obj.protected.Zip, plaintext) + if comp := obj.protected.getCompression(); comp != "" { + 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 } diff --git a/vendor/gopkg.in/square/go-jose.v2/doc.go b/vendor/gopkg.in/square/go-jose.v2/doc.go index f96acaa2..dd1387f3 100644 --- a/vendor/gopkg.in/square/go-jose.v2/doc.go +++ b/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 -encryption and signing based on the JSON Web Encryption and JSON Web Signature -standards. The library supports both the compact and full serialization -formats, and has optional support for multiple recipients. +and Encryption set of standards. It implements encryption and signing based on +the JSON Web Encryption and JSON Web Signature standards, with optional JSON +Web Token support available in a sub-package. The library supports both the +compact and full serialization formats, and has optional support for multiple +recipients. */ package jose diff --git a/vendor/gopkg.in/square/go-jose.v2/encoding.go b/vendor/gopkg.in/square/go-jose.v2/encoding.go index 9f37ef46..b9687c64 100644 --- a/vendor/gopkg.in/square/go-jose.v2/encoding.go +++ b/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") diff --git a/vendor/gopkg.in/square/go-jose.v2/jwe.go b/vendor/gopkg.in/square/go-jose.v2/jwe.go index b6e29c6a..b5a6dcdf 100644 --- a/vendor/gopkg.in/square/go-jose.v2/jwe.go +++ b/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 != "") || - (parsed.Header != nil && parsed.Header.Nonce != "") { - return nil, ErrUnprotectedNonce + if parsed.Unprotected != nil { + if nonce := parsed.Unprotected.getNonce(); nonce != "" { + 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") } } diff --git a/vendor/gopkg.in/square/go-jose.v2/jwk.go b/vendor/gopkg.in/square/go-jose.v2/jwk.go index 9abe3002..8081d5ad 100644 --- a/vendor/gopkg.in/square/go-jose.v2/jwk.go +++ b/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)) - for i, cert := range raw.X5c { - raw, err := base64.StdEncoding.DecodeString(cert) + k.Certificates, err = parseCertificateChain(raw.X5c) if err != nil { - return err - } - k.Certificates[i], err = x509.ParseCertificate(raw) - if err != nil { - return err + return fmt.Errorf("failed to unmarshal x5c field: %s", 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 diff --git a/vendor/gopkg.in/square/go-jose.v2/jws.go b/vendor/gopkg.in/square/go-jose.v2/jws.go index 5555f43a..8b59b6ab 100644 --- a/vendor/gopkg.in/square/go-jose.v2/jws.go +++ b/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. diff --git a/vendor/gopkg.in/square/go-jose.v2/opaque.go b/vendor/gopkg.in/square/go-jose.v2/opaque.go new file mode 100644 index 00000000..4a8bd8f3 --- /dev/null +++ b/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) +} diff --git a/vendor/gopkg.in/square/go-jose.v2/shared.go b/vendor/gopkg.in/square/go-jose.v2/shared.go index 17373f00..b3ac932b 100644 --- a/vendor/gopkg.in/square/go-jose.v2/shared.go +++ b/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"` - Enc ContentEncryption `json:"enc,omitempty"` - Zip CompressionAlgorithm `json:"zip,omitempty"` - Crit []string `json:"crit,omitempty"` - Apu *byteBuffer `json:"apu,omitempty"` - 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"` -} +// +// The decoding of the constituent items is deferred because we want to marshal +// some members into particular structs rather than generic maps, but at the +// same time we need to receive any extra fields unhandled by this library to +// pass through to consuming code in case it wants to examine them. +type rawHeader map[HeaderKey]*json.RawMessage // 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 { - return Header{ - KeyID: parsed.Kid, - JSONWebKey: parsed.Jwk, - Algorithm: parsed.Alg, - Nonce: parsed.Nonce, +func (parsed rawHeader) sanitized() (h Header, err error) { + for k, v := range parsed { + if v == nil { + continue + } + 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 == "" { - dst.Alg = src.Alg - } - if dst.Enc == "" { - dst.Enc = src.Enc - } - 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 + for k, v := range *src { + if dst.isSet(k) { + continue + } + + dst[k] = v } } @@ -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 +} diff --git a/vendor/gopkg.in/square/go-jose.v2/signing.go b/vendor/gopkg.in/square/go-jose.v2/signing.go index c314b125..be6cf048 100644 --- a/vendor/gopkg.in/square/go-jose.v2/signing.go +++ b/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 - nonceSource NonceSource - embedJWK bool + recipients []recipientSigInfo + nonceSource NonceSource + 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) - if err != nil { - return recipientSigInfo{}, err - } - recipient.publicKey.KeyID = signingKey.KeyID - return recipient, nil - default: - return recipientSigInfo{}, ErrUnsupportedKeyType + return newJWKSigner(alg, *signingKey) } + 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{ - Alg: string(recipient.sigAlg), + protected := map[HeaderKey]interface{}{ + 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) - alg := SignatureAlgorithm(headers.Alg) + input := obj.computeAuthData(payload, &signature) + 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) - alg := SignatureAlgorithm(headers.Alg) - err := verifier.verifyPayload(input, signature.Signature, alg) + input := obj.computeAuthData(payload, &signature) + alg := headers.getSignatureAlgorithm() + 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 } diff --git a/vendor/gopkg.in/square/go-jose.v2/symmetric.go b/vendor/gopkg.in/square/go-jose.v2/symmetric.go index 130e5421..09b63cef 100644 --- a/vendor/gopkg.in/square/go-jose.v2/symmetric.go +++ b/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{ - Iv: newBuffer(parts.iv), - Tag: newBuffer(parts.tag), - }, + header: header, 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