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[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [crypto/] [md5/] [md5.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 md5 implements the MD5 hash algorithm as defined in RFC 1321.
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package md5
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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.MD5, New)
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}
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// The size of an MD5 checksum in bytes.
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const Size = 16
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// The blocksize of MD5 in bytes.
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const BlockSize = 64
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const (
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        _Chunk = 64
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        _Init0 = 0x67452301
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        _Init1 = 0xEFCDAB89
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        _Init2 = 0x98BADCFE
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        _Init3 = 0x10325476
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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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        s   [4]uint32
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        x   [_Chunk]byte
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        nx  int
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        len uint64
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}
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func (d *digest) Reset() {
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        d.s[0] = _Init0
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        d.s[1] = _Init1
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        d.s[2] = _Init2
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        d.s[3] = _Init3
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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 MD5 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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func (d *digest) Size() int { return Size }
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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 := *d0
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        // Padding.  Add a 1 bit and 0 bits until 56 bytes mod 64.
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        len := d.len
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        var tmp [64]byte
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        tmp[0] = 0x80
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        if len%64 < 56 {
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                d.Write(tmp[0 : 56-len%64])
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        } else {
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                d.Write(tmp[0 : 64+56-len%64])
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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 < 8; i++ {
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                tmp[i] = byte(len >> (8 * i))
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        }
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        d.Write(tmp[0:8])
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        if d.nx != 0 {
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                panic("d.nx != 0")
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        }
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        var digest [Size]byte
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        for i, s := range d.s {
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                digest[i*4] = byte(s)
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                digest[i*4+1] = byte(s >> 8)
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                digest[i*4+2] = byte(s >> 16)
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                digest[i*4+3] = byte(s >> 24)
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        }
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        return append(in, digest[:]...)
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}

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