mirror of
https://github.com/golang/go
synced 2024-10-05 02:31:21 -06:00
105 lines
1.6 KiB
Go
105 lines
1.6 KiB
Go
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// 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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// SHA1 hash algorithm. See RFC 3174.
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package sha1
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import "os"
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package const (
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Chunk = 64;
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)
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const (
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H0 = 0x67452301;
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H1 = 0xEFCDAB89;
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H2 = 0x98BADCFE;
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H3 = 0x10325476;
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H4 = 0xC3D2E1F0;
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)
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export type Digest struct {
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h [5]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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export func NewDigest() *Digest {
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d := new(Digest);
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d.h[0] = H0;
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d.h[1] = H1;
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d.h[2] = H2;
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d.h[3] = H3;
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d.h[4] = H4;
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return d;
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}
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package func Block(dig *Digest, p *[]byte) int
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func (d *Digest) Write(p *[]byte) (nn int, err *os.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);
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d.nx = 0;
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}
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p = p[n:len(p)];
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}
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n := Block(d, p);
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p = p[n:len(p)];
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if len(p) > 0 {
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for i := 0; i < len(p); i++ {
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d.x[i] = p[i];
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}
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d.nx = len(p);
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}
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return;
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}
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func (d *Digest) Sum() *[]byte {
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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>>(56-8*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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panicln("oops");
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}
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p := new([]byte, 20);
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j := 0;
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for i := 0; i < 5; i++ {
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s := d.h[i];
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p[j] = byte(s>>24); j++;
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p[j] = byte(s>>16); j++;
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p[j] = byte(s>>8); j++;
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p[j] = byte(s); j++;
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}
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return p;
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}
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