198 lines
3.8 KiB
Go
198 lines
3.8 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 SHA384 and SHA512 hash algorithms as defined
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// in FIPS 180-2.
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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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}
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// The size of a SHA512 checksum in bytes.
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const Size = 64
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// The size of a SHA384 checksum in bytes.
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const Size384 = 48
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// The blocksize of SHA512 and SHA384 in bytes.
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const BlockSize = 128
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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_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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is384 bool // mark if this digest is SHA-384
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}
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func (d *digest) Reset() {
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if !d.is384 {
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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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} else {
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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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}
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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 SHA512 checksum.
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func New() hash.Hash {
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d := new(digest)
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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 SHA384 checksum.
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func New384() hash.Hash {
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d := new(digest)
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d.is384 = true
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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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if !d.is384 {
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return Size
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}
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return Size384
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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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if d.is384 {
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return append(in, hash[:Size384]...)
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}
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return append(in, hash[:]...)
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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.is384 {
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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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var d digest
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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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var d digest
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d.is384 = true
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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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