forked from mirror/go-ethereum
code.google.com/p/go.crypto is deprecated and will cause problems in future versions of Go.release/1.0.1
Felix Lange
10 years ago
parent
bb346a3ae1
commit
119bea22aa
@ -1,77 +0,0 @@ |
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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/* |
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Package pbkdf2 implements the key derivation function PBKDF2 as defined in RFC |
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2898 / PKCS #5 v2.0. |
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A key derivation function is useful when encrypting data based on a password |
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or any other not-fully-random data. It uses a pseudorandom function to derive |
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a secure encryption key based on the password. |
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While v2.0 of the standard defines only one pseudorandom function to use, |
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HMAC-SHA1, the drafted v2.1 specification allows use of all five FIPS Approved |
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Hash Functions SHA-1, SHA-224, SHA-256, SHA-384 and SHA-512 for HMAC. To |
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choose, you can pass the `New` functions from the different SHA packages to |
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pbkdf2.Key. |
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*/ |
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package pbkdf2 |
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import ( |
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"crypto/hmac" |
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"hash" |
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) |
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// Key derives a key from the password, salt and iteration count, returning a
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// []byte of length keylen that can be used as cryptographic key. The key is
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// derived based on the method described as PBKDF2 with the HMAC variant using
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// the supplied hash function.
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//
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// For example, to use a HMAC-SHA-1 based PBKDF2 key derivation function, you
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// can get a derived key for e.g. AES-256 (which needs a 32-byte key) by
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// doing:
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//
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// dk := pbkdf2.Key([]byte("some password"), salt, 4096, 32, sha1.New)
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//
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// Remember to get a good random salt. At least 8 bytes is recommended by the
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// RFC.
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//
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// Using a higher iteration count will increase the cost of an exhaustive
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// search but will also make derivation proportionally slower.
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func Key(password, salt []byte, iter, keyLen int, h func() hash.Hash) []byte { |
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prf := hmac.New(h, password) |
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hashLen := prf.Size() |
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numBlocks := (keyLen + hashLen - 1) / hashLen |
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var buf [4]byte |
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dk := make([]byte, 0, numBlocks*hashLen) |
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U := make([]byte, hashLen) |
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for block := 1; block <= numBlocks; block++ { |
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// N.B.: || means concatenation, ^ means XOR
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// for each block T_i = U_1 ^ U_2 ^ ... ^ U_iter
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// U_1 = PRF(password, salt || uint(i))
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prf.Reset() |
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prf.Write(salt) |
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buf[0] = byte(block >> 24) |
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buf[1] = byte(block >> 16) |
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buf[2] = byte(block >> 8) |
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buf[3] = byte(block) |
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prf.Write(buf[:4]) |
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dk = prf.Sum(dk) |
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T := dk[len(dk)-hashLen:] |
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copy(U, T) |
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// U_n = PRF(password, U_(n-1))
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for n := 2; n <= iter; n++ { |
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prf.Reset() |
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prf.Write(U) |
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U = U[:0] |
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U = prf.Sum(U) |
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for x := range U { |
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T[x] ^= U[x] |
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} |
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} |
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} |
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return dk[:keyLen] |
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} |
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@ -1,157 +0,0 @@ |
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package pbkdf2 |
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import ( |
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"bytes" |
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"crypto/sha1" |
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"crypto/sha256" |
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"hash" |
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"testing" |
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) |
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type testVector struct { |
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password string |
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salt string |
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iter int |
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output []byte |
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} |
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// Test vectors from RFC 6070, http://tools.ietf.org/html/rfc6070
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var sha1TestVectors = []testVector{ |
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{ |
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"password", |
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"salt", |
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1, |
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[]byte{ |
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0x0c, 0x60, 0xc8, 0x0f, 0x96, 0x1f, 0x0e, 0x71, |
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0xf3, 0xa9, 0xb5, 0x24, 0xaf, 0x60, 0x12, 0x06, |
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0x2f, 0xe0, 0x37, 0xa6, |
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}, |
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}, |
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{ |
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"password", |
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"salt", |
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2, |
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[]byte{ |
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0xea, 0x6c, 0x01, 0x4d, 0xc7, 0x2d, 0x6f, 0x8c, |
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0xcd, 0x1e, 0xd9, 0x2a, 0xce, 0x1d, 0x41, 0xf0, |
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0xd8, 0xde, 0x89, 0x57, |
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}, |
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}, |
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{ |
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"password", |
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"salt", |
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4096, |
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[]byte{ |
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0x4b, 0x00, 0x79, 0x01, 0xb7, 0x65, 0x48, 0x9a, |
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0xbe, 0xad, 0x49, 0xd9, 0x26, 0xf7, 0x21, 0xd0, |
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0x65, 0xa4, 0x29, 0xc1, |
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}, |
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}, |
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// // This one takes too long
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// {
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// "password",
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// "salt",
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// 16777216,
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// []byte{
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// 0xee, 0xfe, 0x3d, 0x61, 0xcd, 0x4d, 0xa4, 0xe4,
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// 0xe9, 0x94, 0x5b, 0x3d, 0x6b, 0xa2, 0x15, 0x8c,
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// 0x26, 0x34, 0xe9, 0x84,
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// },
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// },
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{ |
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"passwordPASSWORDpassword", |
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"saltSALTsaltSALTsaltSALTsaltSALTsalt", |
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4096, |
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[]byte{ |
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0x3d, 0x2e, 0xec, 0x4f, 0xe4, 0x1c, 0x84, 0x9b, |
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0x80, 0xc8, 0xd8, 0x36, 0x62, 0xc0, 0xe4, 0x4a, |
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0x8b, 0x29, 0x1a, 0x96, 0x4c, 0xf2, 0xf0, 0x70, |
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0x38, |
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}, |
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}, |
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{ |
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"pass\000word", |
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"sa\000lt", |
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4096, |
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[]byte{ |
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0x56, 0xfa, 0x6a, 0xa7, 0x55, 0x48, 0x09, 0x9d, |
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0xcc, 0x37, 0xd7, 0xf0, 0x34, 0x25, 0xe0, 0xc3, |
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}, |
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}, |
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} |
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// Test vectors from
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// http://stackoverflow.com/questions/5130513/pbkdf2-hmac-sha2-test-vectors
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var sha256TestVectors = []testVector{ |
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{ |
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"password", |
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"salt", |
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1, |
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[]byte{ |
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0x12, 0x0f, 0xb6, 0xcf, 0xfc, 0xf8, 0xb3, 0x2c, |
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0x43, 0xe7, 0x22, 0x52, 0x56, 0xc4, 0xf8, 0x37, |
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0xa8, 0x65, 0x48, 0xc9, |
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}, |
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}, |
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{ |
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"password", |
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"salt", |
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2, |
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[]byte{ |
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0xae, 0x4d, 0x0c, 0x95, 0xaf, 0x6b, 0x46, 0xd3, |
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0x2d, 0x0a, 0xdf, 0xf9, 0x28, 0xf0, 0x6d, 0xd0, |
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0x2a, 0x30, 0x3f, 0x8e, |
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}, |
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}, |
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{ |
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"password", |
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"salt", |
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4096, |
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[]byte{ |
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0xc5, 0xe4, 0x78, 0xd5, 0x92, 0x88, 0xc8, 0x41, |
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0xaa, 0x53, 0x0d, 0xb6, 0x84, 0x5c, 0x4c, 0x8d, |
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0x96, 0x28, 0x93, 0xa0, |
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}, |
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}, |
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{ |
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"passwordPASSWORDpassword", |
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"saltSALTsaltSALTsaltSALTsaltSALTsalt", |
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4096, |
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[]byte{ |
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0x34, 0x8c, 0x89, 0xdb, 0xcb, 0xd3, 0x2b, 0x2f, |
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0x32, 0xd8, 0x14, 0xb8, 0x11, 0x6e, 0x84, 0xcf, |
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0x2b, 0x17, 0x34, 0x7e, 0xbc, 0x18, 0x00, 0x18, |
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0x1c, |
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}, |
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}, |
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{ |
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"pass\000word", |
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"sa\000lt", |
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4096, |
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[]byte{ |
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0x89, 0xb6, 0x9d, 0x05, 0x16, 0xf8, 0x29, 0x89, |
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0x3c, 0x69, 0x62, 0x26, 0x65, 0x0a, 0x86, 0x87, |
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}, |
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}, |
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} |
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func testHash(t *testing.T, h func() hash.Hash, hashName string, vectors []testVector) { |
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for i, v := range vectors { |
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o := Key([]byte(v.password), []byte(v.salt), v.iter, len(v.output), h) |
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if !bytes.Equal(o, v.output) { |
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t.Errorf("%s %d: expected %x, got %x", hashName, i, v.output, o) |
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} |
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} |
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} |
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func TestWithHMACSHA1(t *testing.T) { |
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testHash(t, sha1.New, "SHA1", sha1TestVectors) |
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} |
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func TestWithHMACSHA256(t *testing.T) { |
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testHash(t, sha256.New, "SHA256", sha256TestVectors) |
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} |
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