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