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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [crypto/] [sha512/] [sha512.go] - Blame information for rev 747

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1 747 jeremybenn 
// 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 := len(p)
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                if n > _Chunk-d.nx {
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                        n = _Chunk - d.nx
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                }
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                for i := 0; i < n; i++ {
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                        d.x[d.nx+i] = p[i]
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                }
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                d.nx += n
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                if d.nx == _Chunk {
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                        _Block(d, d.x[0:])
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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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        n := _Block(d, p)
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        p = p[n:]
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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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        // 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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        size := Size
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        if d.is384 {
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                h = d.h[:6]
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                size = Size384
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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 append(in, digest[:size]...)
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}

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