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📁 ..	-	2025-05-25 12:27
📄 bcrypt_pbkdf.go // Copyright 2014 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 bcrypt_pbkdf implements bcrypt_pbkdf(3) from OpenBSD. // // See https://flak.tedunangst.com/post/bcrypt-pbkdf and // https://cvsweb.openbsd.org/cgi-bin/cvsweb/src/lib/libutil/bcrypt_pbkdf.c. package bcrypt_pbkdf import ( "crypto/sha512" "errors" "golang.org/x/crypto/blowfish" ) const blockSize = 32 // Key derives a key from the password, salt and rounds count, returning a // []byte of length keyLen that can be used as cryptographic key. func Key(password, salt []byte, rounds, keyLen int) ([]byte, error) { if rounds < 1 { return nil, errors.New("bcrypt_pbkdf: number of rounds is too small") } if len(password) == 0 { return nil, errors.New("bcrypt_pbkdf: empty password") } if len(salt) == 0 \|\| len(salt) > 1<<20 { return nil, errors.New("bcrypt_pbkdf: bad salt length") } if keyLen > 1024 { return nil, errors.New("bcrypt_pbkdf: keyLen is too large") } numBlocks := (keyLen + blockSize - 1) / blockSize key := make([]byte, numBlocksblockSize) h := sha512.New() h.Write(password) shapass := h.Sum(nil) shasalt := make([]byte, 0, sha512.Size) cnt, tmp := make([]byte, 4), make([]byte, blockSize) for block := 1; block <= numBlocks; block++ { h.Reset() h.Write(salt) cnt[0] = byte(block >> 24) cnt[1] = byte(block >> 16) cnt[2] = byte(block >> 8) cnt[3] = byte(block) h.Write(cnt) bcryptHash(tmp, shapass, h.Sum(shasalt)) out := make([]byte, blockSize) copy(out, tmp) for i := 2; i <= rounds; i++ { h.Reset() h.Write(tmp) bcryptHash(tmp, shapass, h.Sum(shasalt)) for j := 0; j < len(out); j++ { out[j] ^= tmp[j] } } for i, v := range out { key[inumBlocks+(block-1)] = v } } return key[:keyLen], nil } var magic = []byte("OxychromaticBlowfishSwatDynamite") func bcryptHash(out, shapass, shasalt []byte) { c, err := blowfish.NewSaltedCipher(shapass, shasalt) if err != nil { panic(err) } for i := 0; i < 64; i++ { blowfish.ExpandKey(shasalt, c) blowfish.ExpandKey(shapass, c) } copy(out, magic) for i := 0; i < 32; i += 8 { for j := 0; j < 64; j++ { c.Encrypt(out[i:i+8], out[i:i+8]) } } // Swap bytes due to different endianness. for i := 0; i < 32; i += 4 { out[i+3], out[i+2], out[i+1], out[i] = out[i], out[i+1], out[i+2], out[i+3] } }	2.37 KB	2025-05-25 12:27
📄 bcrypt_pbkdf_test.go // Copyright 2014 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 bcrypt_pbkdf import ( "bytes" "testing" ) // Test vectors generated by the reference implementation from OpenBSD. var golden = []struct { rounds int password, salt, result []byte }{ { 12, []byte("password"), []byte("salt"), []byte{ 0x1a, 0xe4, 0x2c, 0x05, 0xd4, 0x87, 0xbc, 0x02, 0xf6, 0x49, 0x21, 0xa4, 0xeb, 0xe4, 0xea, 0x93, 0xbc, 0xac, 0xfe, 0x13, 0x5f, 0xda, 0x99, 0x97, 0x4c, 0x06, 0xb7, 0xb0, 0x1f, 0xae, 0x14, 0x9a, }, }, { 3, []byte("passwordy\x00PASSWORD\x00"), []byte("salty\x00SALT\x00"), []byte{ 0x7f, 0x31, 0x0b, 0xd3, 0xe7, 0x8c, 0x32, 0x80, 0xc5, 0x9c, 0xe4, 0x59, 0x52, 0x11, 0xa2, 0x92, 0x8e, 0x8d, 0x4e, 0xc7, 0x44, 0xc1, 0xed, 0x2e, 0xfc, 0x9f, 0x76, 0x4e, 0x33, 0x88, 0xe0, 0xad, }, }, { // See http://thread.gmane.org/gmane.os.openbsd.bugs/20542 8, []byte("секретное слово"), []byte("посолить немножко"), []byte{ 0x8d, 0xf4, 0x3f, 0xc6, 0xfe, 0x13, 0x1f, 0xc4, 0x7f, 0x0c, 0x9e, 0x39, 0x22, 0x4b, 0xd9, 0x4c, 0x70, 0xb6, 0xfc, 0xc8, 0xee, 0x81, 0x35, 0xfa, 0xdd, 0xf6, 0x11, 0x56, 0xe6, 0xcb, 0x27, 0x33, 0xea, 0x76, 0x5f, 0x31, 0x5a, 0x3e, 0x1e, 0x4a, 0xfc, 0x35, 0xbf, 0x86, 0x87, 0xd1, 0x89, 0x25, 0x4c, 0x1e, 0x05, 0xa6, 0xfe, 0x80, 0xc0, 0x61, 0x7f, 0x91, 0x83, 0xd6, 0x72, 0x60, 0xd6, 0xa1, 0x15, 0xc6, 0xc9, 0x4e, 0x36, 0x03, 0xe2, 0x30, 0x3f, 0xbb, 0x43, 0xa7, 0x6a, 0x64, 0x52, 0x3f, 0xfd, 0xa6, 0x86, 0xb1, 0xd4, 0x51, 0x85, 0x43, }, }, } func TestKey(t testing.T) { for i, v := range golden { k, err := Key(v.password, v.salt, v.rounds, len(v.result)) if err != nil { t.Errorf("%d: %s", i, err) continue } if !bytes.Equal(k, v.result) { t.Errorf("%d: expected\n%x\n, got\n%x\n", i, v.result, k) } } } func TestBcryptHash(t testing.T) { good := []byte{ 0x87, 0x90, 0x48, 0x70, 0xee, 0xf9, 0xde, 0xdd, 0xf8, 0xe7, 0x61, 0x1a, 0x14, 0x01, 0x06, 0xe6, 0xaa, 0xf1, 0xa3, 0x63, 0xd9, 0xa2, 0xc5, 0x04, 0xdb, 0x35, 0x64, 0x43, 0x72, 0x1e, 0xb5, 0x55, } var pass, salt [64]byte var result [32]byte for i := 0; i < 64; i++ { pass[i] = byte(i) salt[i] = byte(i + 64) } bcryptHash(result[:], pass[:], salt[:]) if !bytes.Equal(result[:], good) { t.Errorf("expected %x, got %x", good, result) } } func BenchmarkKey(b *testing.B) { pass := []byte("password") salt := []byte("salt") for i := 0; i < b.N; i++ { Key(pass, salt, 10, 32) } }	2.56 KB	2025-05-25 12:27

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