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📄 example_test.go // Copyright 2017 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 scrypt_test import ( "encoding/base64" "fmt" "log" "golang.org/x/crypto/scrypt" ) func Example() { // DO NOT use this salt value; generate your own random salt. 8 bytes is // a good length. salt := []byte{0xc8, 0x28, 0xf2, 0x58, 0xa7, 0x6a, 0xad, 0x7b} dk, err := scrypt.Key([]byte("some password"), salt, 1<<15, 8, 1, 32) if err != nil { log.Fatal(err) } fmt.Println(base64.StdEncoding.EncodeToString(dk)) // Output: lGnMz8io0AUkfzn6Pls1qX20Vs7PGN6sbYQ2TQgY12M= }	651 B	2025-05-25 12:27
📄 scrypt.go // 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 scrypt implements the scrypt key derivation function as defined in // Colin Percival's paper "Stronger Key Derivation via Sequential Memory-Hard // Functions" (https://www.tarsnap.com/scrypt/scrypt.pdf). package scrypt import ( "crypto/sha256" "encoding/binary" "errors" "math/bits" "golang.org/x/crypto/pbkdf2" ) const maxInt = int(^uint(0) >> 1) // blockCopy copies n numbers from src into dst. func blockCopy(dst, src []uint32, n int) { copy(dst, src[:n]) } // blockXOR XORs numbers from dst with n numbers from src. func blockXOR(dst, src []uint32, n int) { for i, v := range src[:n] { dst[i] ^= v } } // salsaXOR applies Salsa20/8 to the XOR of 16 numbers from tmp and in, // and puts the result into both tmp and out. func salsaXOR(tmp [16]uint32, in, out []uint32) { w0 := tmp[0] ^ in[0] w1 := tmp[1] ^ in[1] w2 := tmp[2] ^ in[2] w3 := tmp[3] ^ in[3] w4 := tmp[4] ^ in[4] w5 := tmp[5] ^ in[5] w6 := tmp[6] ^ in[6] w7 := tmp[7] ^ in[7] w8 := tmp[8] ^ in[8] w9 := tmp[9] ^ in[9] w10 := tmp[10] ^ in[10] w11 := tmp[11] ^ in[11] w12 := tmp[12] ^ in[12] w13 := tmp[13] ^ in[13] w14 := tmp[14] ^ in[14] w15 := tmp[15] ^ in[15] x0, x1, x2, x3, x4, x5, x6, x7, x8 := w0, w1, w2, w3, w4, w5, w6, w7, w8 x9, x10, x11, x12, x13, x14, x15 := w9, w10, w11, w12, w13, w14, w15 for i := 0; i < 8; i += 2 { x4 ^= bits.RotateLeft32(x0+x12, 7) x8 ^= bits.RotateLeft32(x4+x0, 9) x12 ^= bits.RotateLeft32(x8+x4, 13) x0 ^= bits.RotateLeft32(x12+x8, 18) x9 ^= bits.RotateLeft32(x5+x1, 7) x13 ^= bits.RotateLeft32(x9+x5, 9) x1 ^= bits.RotateLeft32(x13+x9, 13) x5 ^= bits.RotateLeft32(x1+x13, 18) x14 ^= bits.RotateLeft32(x10+x6, 7) x2 ^= bits.RotateLeft32(x14+x10, 9) x6 ^= bits.RotateLeft32(x2+x14, 13) x10 ^= bits.RotateLeft32(x6+x2, 18) x3 ^= bits.RotateLeft32(x15+x11, 7) x7 ^= bits.RotateLeft32(x3+x15, 9) x11 ^= bits.RotateLeft32(x7+x3, 13) x15 ^= bits.RotateLeft32(x11+x7, 18) x1 ^= bits.RotateLeft32(x0+x3, 7) x2 ^= bits.RotateLeft32(x1+x0, 9) x3 ^= bits.RotateLeft32(x2+x1, 13) x0 ^= bits.RotateLeft32(x3+x2, 18) x6 ^= bits.RotateLeft32(x5+x4, 7) x7 ^= bits.RotateLeft32(x6+x5, 9) x4 ^= bits.RotateLeft32(x7+x6, 13) x5 ^= bits.RotateLeft32(x4+x7, 18) x11 ^= bits.RotateLeft32(x10+x9, 7) x8 ^= bits.RotateLeft32(x11+x10, 9) x9 ^= bits.RotateLeft32(x8+x11, 13) x10 ^= bits.RotateLeft32(x9+x8, 18) x12 ^= bits.RotateLeft32(x15+x14, 7) x13 ^= bits.RotateLeft32(x12+x15, 9) x14 ^= bits.RotateLeft32(x13+x12, 13) x15 ^= bits.RotateLeft32(x14+x13, 18) } x0 += w0 x1 += w1 x2 += w2 x3 += w3 x4 += w4 x5 += w5 x6 += w6 x7 += w7 x8 += w8 x9 += w9 x10 += w10 x11 += w11 x12 += w12 x13 += w13 x14 += w14 x15 += w15 out[0], tmp[0] = x0, x0 out[1], tmp[1] = x1, x1 out[2], tmp[2] = x2, x2 out[3], tmp[3] = x3, x3 out[4], tmp[4] = x4, x4 out[5], tmp[5] = x5, x5 out[6], tmp[6] = x6, x6 out[7], tmp[7] = x7, x7 out[8], tmp[8] = x8, x8 out[9], tmp[9] = x9, x9 out[10], tmp[10] = x10, x10 out[11], tmp[11] = x11, x11 out[12], tmp[12] = x12, x12 out[13], tmp[13] = x13, x13 out[14], tmp[14] = x14, x14 out[15], tmp[15] = x15, x15 } func blockMix(tmp [16]uint32, in, out []uint32, r int) { blockCopy(tmp[:], in[(2r-1)16:], 16) for i := 0; i < 2r; i += 2 { salsaXOR(tmp, in[i16:], out[i8:]) salsaXOR(tmp, in[i16+16:], out[i8+r16:]) } } func integer(b []uint32, r int) uint64 { j := (2r - 1) 16 return uint64(b[j]) \| uint64(b[j+1])<<32 } func smix(b []byte, r, N int, v, xy []uint32) { var tmp [16]uint32 R := 32 * r x := xy y := xy[R:] j := 0 for i := 0; i < R; i++ { x[i] = binary.LittleEndian.Uint32(b[j:]) j += 4 } for i := 0; i < N; i += 2 { blockCopy(v[iR:], x, R) blockMix(&tmp, x, y, r) blockCopy(v[(i+1)R:], y, R) blockMix(&tmp, y, x, r) } for i := 0; i < N; i += 2 { j := int(integer(x, r) & uint64(N-1)) blockXOR(x, v[jR:], R) blockMix(&tmp, x, y, r) j = int(integer(y, r) & uint64(N-1)) blockXOR(y, v[jR:], R) blockMix(&tmp, y, x, r) } j = 0 for _, v := range x[:R] { binary.LittleEndian.PutUint32(b[j:], v) j += 4 } } // Key derives a key from the password, salt, and cost parameters, returning // a byte slice of length keyLen that can be used as cryptographic key. // // N is a CPU/memory cost parameter, which must be a power of two greater than 1. // r and p must satisfy r * p < 2³⁰. If the parameters do not satisfy the // limits, the function returns a nil byte slice and an error. // // For example, you can get a derived key for e.g. AES-256 (which needs a // 32-byte key) by doing: // // dk, err := scrypt.Key([]byte("some password"), salt, 32768, 8, 1, 32) // // The recommended parameters for interactive logins as of 2017 are N=32768, r=8 // and p=1. The parameters N, r, and p should be increased as memory latency and // CPU parallelism increases; consider setting N to the highest power of 2 you // can derive within 100 milliseconds. Remember to get a good random salt. func Key(password, salt []byte, N, r, p, keyLen int) ([]byte, error) { if N <= 1 \|\| N&(N-1) != 0 { return nil, errors.New("scrypt: N must be > 1 and a power of 2") } if uint64(r)uint64(p) >= 1<<30 \|\| r > maxInt/128/p \|\| r > maxInt/256 \|\| N > maxInt/128/r { return nil, errors.New("scrypt: parameters are too large") } xy := make([]uint32, 64r) v := make([]uint32, 32Nr) b := pbkdf2.Key(password, salt, 1, p128r, sha256.New) for i := 0; i < p; i++ { smix(b[i128r:], r, N, v, xy) } return pbkdf2.Key(password, b, 1, keyLen, sha256.New), nil }	5.6 KB	2025-05-25 12:27
📄 scrypt_test.go // 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 scrypt import ( "bytes" "testing" ) type testVector struct { password string salt string N, r, p int output []byte } var good = []testVector{ { "password", "salt", 2, 10, 10, []byte{ 0x48, 0x2c, 0x85, 0x8e, 0x22, 0x90, 0x55, 0xe6, 0x2f, 0x41, 0xe0, 0xec, 0x81, 0x9a, 0x5e, 0xe1, 0x8b, 0xdb, 0x87, 0x25, 0x1a, 0x53, 0x4f, 0x75, 0xac, 0xd9, 0x5a, 0xc5, 0xe5, 0xa, 0xa1, 0x5f, }, }, { "password", "salt", 16, 100, 100, []byte{ 0x88, 0xbd, 0x5e, 0xdb, 0x52, 0xd1, 0xdd, 0x0, 0x18, 0x87, 0x72, 0xad, 0x36, 0x17, 0x12, 0x90, 0x22, 0x4e, 0x74, 0x82, 0x95, 0x25, 0xb1, 0x8d, 0x73, 0x23, 0xa5, 0x7f, 0x91, 0x96, 0x3c, 0x37, }, }, { "this is a long \000 password", "and this is a long \000 salt", 16384, 8, 1, []byte{ 0xc3, 0xf1, 0x82, 0xee, 0x2d, 0xec, 0x84, 0x6e, 0x70, 0xa6, 0x94, 0x2f, 0xb5, 0x29, 0x98, 0x5a, 0x3a, 0x09, 0x76, 0x5e, 0xf0, 0x4c, 0x61, 0x29, 0x23, 0xb1, 0x7f, 0x18, 0x55, 0x5a, 0x37, 0x07, 0x6d, 0xeb, 0x2b, 0x98, 0x30, 0xd6, 0x9d, 0xe5, 0x49, 0x26, 0x51, 0xe4, 0x50, 0x6a, 0xe5, 0x77, 0x6d, 0x96, 0xd4, 0x0f, 0x67, 0xaa, 0xee, 0x37, 0xe1, 0x77, 0x7b, 0x8a, 0xd5, 0xc3, 0x11, 0x14, 0x32, 0xbb, 0x3b, 0x6f, 0x7e, 0x12, 0x64, 0x40, 0x18, 0x79, 0xe6, 0x41, 0xae, }, }, { "p", "s", 2, 1, 1, []byte{ 0x48, 0xb0, 0xd2, 0xa8, 0xa3, 0x27, 0x26, 0x11, 0x98, 0x4c, 0x50, 0xeb, 0xd6, 0x30, 0xaf, 0x52, }, }, { "", "", 16, 1, 1, []byte{ 0x77, 0xd6, 0x57, 0x62, 0x38, 0x65, 0x7b, 0x20, 0x3b, 0x19, 0xca, 0x42, 0xc1, 0x8a, 0x04, 0x97, 0xf1, 0x6b, 0x48, 0x44, 0xe3, 0x07, 0x4a, 0xe8, 0xdf, 0xdf, 0xfa, 0x3f, 0xed, 0xe2, 0x14, 0x42, 0xfc, 0xd0, 0x06, 0x9d, 0xed, 0x09, 0x48, 0xf8, 0x32, 0x6a, 0x75, 0x3a, 0x0f, 0xc8, 0x1f, 0x17, 0xe8, 0xd3, 0xe0, 0xfb, 0x2e, 0x0d, 0x36, 0x28, 0xcf, 0x35, 0xe2, 0x0c, 0x38, 0xd1, 0x89, 0x06, }, }, { "password", "NaCl", 1024, 8, 16, []byte{ 0xfd, 0xba, 0xbe, 0x1c, 0x9d, 0x34, 0x72, 0x00, 0x78, 0x56, 0xe7, 0x19, 0x0d, 0x01, 0xe9, 0xfe, 0x7c, 0x6a, 0xd7, 0xcb, 0xc8, 0x23, 0x78, 0x30, 0xe7, 0x73, 0x76, 0x63, 0x4b, 0x37, 0x31, 0x62, 0x2e, 0xaf, 0x30, 0xd9, 0x2e, 0x22, 0xa3, 0x88, 0x6f, 0xf1, 0x09, 0x27, 0x9d, 0x98, 0x30, 0xda, 0xc7, 0x27, 0xaf, 0xb9, 0x4a, 0x83, 0xee, 0x6d, 0x83, 0x60, 0xcb, 0xdf, 0xa2, 0xcc, 0x06, 0x40, }, }, { "pleaseletmein", "SodiumChloride", 16384, 8, 1, []byte{ 0x70, 0x23, 0xbd, 0xcb, 0x3a, 0xfd, 0x73, 0x48, 0x46, 0x1c, 0x06, 0xcd, 0x81, 0xfd, 0x38, 0xeb, 0xfd, 0xa8, 0xfb, 0xba, 0x90, 0x4f, 0x8e, 0x3e, 0xa9, 0xb5, 0x43, 0xf6, 0x54, 0x5d, 0xa1, 0xf2, 0xd5, 0x43, 0x29, 0x55, 0x61, 0x3f, 0x0f, 0xcf, 0x62, 0xd4, 0x97, 0x05, 0x24, 0x2a, 0x9a, 0xf9, 0xe6, 0x1e, 0x85, 0xdc, 0x0d, 0x65, 0x1e, 0x40, 0xdf, 0xcf, 0x01, 0x7b, 0x45, 0x57, 0x58, 0x87, }, }, /* // Disabled: needs 1 GiB RAM and takes too long for a simple test. { "pleaseletmein", "SodiumChloride", 1048576, 8, 1, []byte{ 0x21, 0x01, 0xcb, 0x9b, 0x6a, 0x51, 0x1a, 0xae, 0xad, 0xdb, 0xbe, 0x09, 0xcf, 0x70, 0xf8, 0x81, 0xec, 0x56, 0x8d, 0x57, 0x4a, 0x2f, 0xfd, 0x4d, 0xab, 0xe5, 0xee, 0x98, 0x20, 0xad, 0xaa, 0x47, 0x8e, 0x56, 0xfd, 0x8f, 0x4b, 0xa5, 0xd0, 0x9f, 0xfa, 0x1c, 0x6d, 0x92, 0x7c, 0x40, 0xf4, 0xc3, 0x37, 0x30, 0x40, 0x49, 0xe8, 0xa9, 0x52, 0xfb, 0xcb, 0xf4, 0x5c, 0x6f, 0xa7, 0x7a, 0x41, 0xa4, }, }, / } var bad = []testVector{ {"p", "s", 0, 1, 1, nil}, // N == 0 {"p", "s", 1, 1, 1, nil}, // N == 1 {"p", "s", 7, 8, 1, nil}, // N is not power of 2 {"p", "s", 16, maxInt / 2, maxInt / 2, nil}, // p r too large } func TestKey(t testing.T) { for i, v := range good { k, err := Key([]byte(v.password), []byte(v.salt), v.N, v.r, v.p, len(v.output)) if err != nil { t.Errorf("%d: got unexpected error: %s", i, err) } if !bytes.Equal(k, v.output) { t.Errorf("%d: expected %x, got %x", i, v.output, k) } } for i, v := range bad { _, err := Key([]byte(v.password), []byte(v.salt), v.N, v.r, v.p, 32) if err == nil { t.Errorf("%d: expected error, got nil", i) } } } var sink []byte func BenchmarkKey(b testing.B) { for i := 0; i < b.N; i++ { sink, _ = Key([]byte("password"), []byte("salt"), 1<<15, 8, 1, 64) } }	4.38 KB	2025-05-25 12:27

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