| // Copyright 2009 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 sha512 implements the SHA-384, SHA-512, SHA-512/224, and SHA-512/256 |
| // hash algorithms as defined in FIPS 180-4. |
| package sha512 |
| |
| import ( |
| "crypto" |
| "hash" |
| ) |
| |
| func init() { |
| crypto.RegisterHash(crypto.SHA384, New384) |
| crypto.RegisterHash(crypto.SHA512, New) |
| crypto.RegisterHash(crypto.SHA512_224, New512_224) |
| crypto.RegisterHash(crypto.SHA512_256, New512_256) |
| } |
| |
| const ( |
| // Size is the size, in bytes, of a SHA-512 checksum. |
| Size = 64 |
| |
| // Size224 is the size, in bytes, of a SHA-512/224 checksum. |
| Size224 = 28 |
| |
| // Size256 is the size, in bytes, of a SHA-512/256 checksum. |
| Size256 = 32 |
| |
| // Size384 is the size, in bytes, of a SHA-384 checksum. |
| Size384 = 48 |
| |
| // BlockSize is the block size, in bytes, of the SHA-512/224, |
| // SHA-512/256, SHA-384 and SHA-512 hash functions. |
| BlockSize = 128 |
| ) |
| |
| const ( |
| chunk = 128 |
| init0 = 0x6a09e667f3bcc908 |
| init1 = 0xbb67ae8584caa73b |
| init2 = 0x3c6ef372fe94f82b |
| init3 = 0xa54ff53a5f1d36f1 |
| init4 = 0x510e527fade682d1 |
| init5 = 0x9b05688c2b3e6c1f |
| init6 = 0x1f83d9abfb41bd6b |
| init7 = 0x5be0cd19137e2179 |
| init0_224 = 0x8c3d37c819544da2 |
| init1_224 = 0x73e1996689dcd4d6 |
| init2_224 = 0x1dfab7ae32ff9c82 |
| init3_224 = 0x679dd514582f9fcf |
| init4_224 = 0x0f6d2b697bd44da8 |
| init5_224 = 0x77e36f7304c48942 |
| init6_224 = 0x3f9d85a86a1d36c8 |
| init7_224 = 0x1112e6ad91d692a1 |
| init0_256 = 0x22312194fc2bf72c |
| init1_256 = 0x9f555fa3c84c64c2 |
| init2_256 = 0x2393b86b6f53b151 |
| init3_256 = 0x963877195940eabd |
| init4_256 = 0x96283ee2a88effe3 |
| init5_256 = 0xbe5e1e2553863992 |
| init6_256 = 0x2b0199fc2c85b8aa |
| init7_256 = 0x0eb72ddc81c52ca2 |
| init0_384 = 0xcbbb9d5dc1059ed8 |
| init1_384 = 0x629a292a367cd507 |
| init2_384 = 0x9159015a3070dd17 |
| init3_384 = 0x152fecd8f70e5939 |
| init4_384 = 0x67332667ffc00b31 |
| init5_384 = 0x8eb44a8768581511 |
| init6_384 = 0xdb0c2e0d64f98fa7 |
| init7_384 = 0x47b5481dbefa4fa4 |
| ) |
| |
| // digest represents the partial evaluation of a checksum. |
| type digest struct { |
| h [8]uint64 |
| x [chunk]byte |
| nx int |
| len uint64 |
| function crypto.Hash |
| } |
| |
| func (d *digest) Reset() { |
| switch d.function { |
| case crypto.SHA384: |
| d.h[0] = init0_384 |
| d.h[1] = init1_384 |
| d.h[2] = init2_384 |
| d.h[3] = init3_384 |
| d.h[4] = init4_384 |
| d.h[5] = init5_384 |
| d.h[6] = init6_384 |
| d.h[7] = init7_384 |
| case crypto.SHA512_224: |
| d.h[0] = init0_224 |
| d.h[1] = init1_224 |
| d.h[2] = init2_224 |
| d.h[3] = init3_224 |
| d.h[4] = init4_224 |
| d.h[5] = init5_224 |
| d.h[6] = init6_224 |
| d.h[7] = init7_224 |
| case crypto.SHA512_256: |
| d.h[0] = init0_256 |
| d.h[1] = init1_256 |
| d.h[2] = init2_256 |
| d.h[3] = init3_256 |
| d.h[4] = init4_256 |
| d.h[5] = init5_256 |
| d.h[6] = init6_256 |
| d.h[7] = init7_256 |
| default: |
| d.h[0] = init0 |
| d.h[1] = init1 |
| d.h[2] = init2 |
| d.h[3] = init3 |
| d.h[4] = init4 |
| d.h[5] = init5 |
| d.h[6] = init6 |
| d.h[7] = init7 |
| } |
| d.nx = 0 |
| d.len = 0 |
| } |
| |
| // New returns a new hash.Hash computing the SHA-512 checksum. |
| func New() hash.Hash { |
| d := &digest{function: crypto.SHA512} |
| d.Reset() |
| return d |
| } |
| |
| // New512_224 returns a new hash.Hash computing the SHA-512/224 checksum. |
| func New512_224() hash.Hash { |
| d := &digest{function: crypto.SHA512_224} |
| d.Reset() |
| return d |
| } |
| |
| // New512_256 returns a new hash.Hash computing the SHA-512/256 checksum. |
| func New512_256() hash.Hash { |
| d := &digest{function: crypto.SHA512_256} |
| d.Reset() |
| return d |
| } |
| |
| // New384 returns a new hash.Hash computing the SHA-384 checksum. |
| func New384() hash.Hash { |
| d := &digest{function: crypto.SHA384} |
| d.Reset() |
| return d |
| } |
| |
| func (d *digest) Size() int { |
| switch d.function { |
| case crypto.SHA512_224: |
| return Size224 |
| case crypto.SHA512_256: |
| return Size256 |
| case crypto.SHA384: |
| return Size384 |
| default: |
| return Size |
| } |
| } |
| |
| func (d *digest) BlockSize() int { return BlockSize } |
| |
| func (d *digest) Write(p []byte) (nn int, err error) { |
| nn = len(p) |
| d.len += uint64(nn) |
| if d.nx > 0 { |
| n := copy(d.x[d.nx:], p) |
| d.nx += n |
| if d.nx == chunk { |
| block(d, d.x[:]) |
| d.nx = 0 |
| } |
| p = p[n:] |
| } |
| if len(p) >= chunk { |
| n := len(p) &^ (chunk - 1) |
| block(d, p[:n]) |
| p = p[n:] |
| } |
| if len(p) > 0 { |
| d.nx = copy(d.x[:], p) |
| } |
| return |
| } |
| |
| func (d0 *digest) Sum(in []byte) []byte { |
| // Make a copy of d0 so that caller can keep writing and summing. |
| d := new(digest) |
| *d = *d0 |
| hash := d.checkSum() |
| switch d.function { |
| case crypto.SHA384: |
| return append(in, hash[:Size384]...) |
| case crypto.SHA512_224: |
| return append(in, hash[:Size224]...) |
| case crypto.SHA512_256: |
| return append(in, hash[:Size256]...) |
| default: |
| return append(in, hash[:]...) |
| } |
| } |
| |
| func (d *digest) checkSum() [Size]byte { |
| // Padding. Add a 1 bit and 0 bits until 112 bytes mod 128. |
| len := d.len |
| var tmp [128]byte |
| tmp[0] = 0x80 |
| if len%128 < 112 { |
| d.Write(tmp[0 : 112-len%128]) |
| } else { |
| d.Write(tmp[0 : 128+112-len%128]) |
| } |
| |
| // Length in bits. |
| len <<= 3 |
| for i := uint(0); i < 16; i++ { |
| tmp[i] = byte(len >> (120 - 8*i)) |
| } |
| d.Write(tmp[0:16]) |
| |
| if d.nx != 0 { |
| panic("d.nx != 0") |
| } |
| |
| h := d.h[:] |
| if d.function == crypto.SHA384 { |
| h = d.h[:6] |
| } |
| |
| var digest [Size]byte |
| for i, s := range h { |
| digest[i*8] = byte(s >> 56) |
| digest[i*8+1] = byte(s >> 48) |
| digest[i*8+2] = byte(s >> 40) |
| digest[i*8+3] = byte(s >> 32) |
| digest[i*8+4] = byte(s >> 24) |
| digest[i*8+5] = byte(s >> 16) |
| digest[i*8+6] = byte(s >> 8) |
| digest[i*8+7] = byte(s) |
| } |
| |
| return digest |
| } |
| |
| // Sum512 returns the SHA512 checksum of the data. |
| func Sum512(data []byte) [Size]byte { |
| d := digest{function: crypto.SHA512} |
| d.Reset() |
| d.Write(data) |
| return d.checkSum() |
| } |
| |
| // Sum384 returns the SHA384 checksum of the data. |
| func Sum384(data []byte) (sum384 [Size384]byte) { |
| d := digest{function: crypto.SHA384} |
| d.Reset() |
| d.Write(data) |
| sum := d.checkSum() |
| copy(sum384[:], sum[:Size384]) |
| return |
| } |
| |
| // Sum512_224 returns the Sum512/224 checksum of the data. |
| func Sum512_224(data []byte) (sum224 [Size224]byte) { |
| d := digest{function: crypto.SHA512_224} |
| d.Reset() |
| d.Write(data) |
| sum := d.checkSum() |
| copy(sum224[:], sum[:Size224]) |
| return |
| } |
| |
| // Sum512_256 returns the Sum512/256 checksum of the data. |
| func Sum512_256(data []byte) (sum256 [Size256]byte) { |
| d := digest{function: crypto.SHA512_256} |
| d.Reset() |
| d.Write(data) |
| sum := d.checkSum() |
| copy(sum256[:], sum[:Size256]) |
| return |
| } |
