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// 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
}