OpenCores
URL https://opencores.org/ocsvn/openrisc/openrisc/trunk

Subversion Repositories openrisc

[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [libgo/] [go/] [crypto/] [sha1/] [sha1.go] - Blame information for rev 801

Go to most recent revision | Details | Compare with Previous | View Log

Line No. Rev Author Line
1 747 jeremybenn 
// Copyright 2009 The Go Authors. All rights reserved.
2 
// Use of this source code is governed by a BSD-style
3 
// license that can be found in the LICENSE file.
4 
 
5 
// Package sha1 implements the SHA1 hash algorithm as defined in RFC 3174.
6 
package sha1
7 
 
8 
import (
9 
        "crypto"
10 
        "hash"
11 
)
12 
 
13 
func init() {
14 
        crypto.RegisterHash(crypto.SHA1, New)
15 
}
16 
 
17 
// The size of a SHA1 checksum in bytes.
18 
const Size = 20
19 
 
20 
// The blocksize of SHA1 in bytes.
21 
const BlockSize = 64
22 
 
23 
const (
24 
        _Chunk = 64
25 
        _Init0 = 0x67452301
26 
        _Init1 = 0xEFCDAB89
27 
        _Init2 = 0x98BADCFE
28 
        _Init3 = 0x10325476
29 
        _Init4 = 0xC3D2E1F0
30 
)
31 
 
32 
// digest represents the partial evaluation of a checksum.
33 
type digest struct {
34 
        h   [5]uint32
35 
        x   [_Chunk]byte
36 
        nx  int
37 
        len uint64
38 
}
39 
 
40 
func (d *digest) Reset() {
41 
        d.h[0] = _Init0
42 
        d.h[1] = _Init1
43 
        d.h[2] = _Init2
44 
        d.h[3] = _Init3
45 
        d.h[4] = _Init4
46 
        d.nx = 0
47 
        d.len = 0
48 
}
49 
 
50 
// New returns a new hash.Hash computing the SHA1 checksum.
51 
func New() hash.Hash {
52 
        d := new(digest)
53 
        d.Reset()
54 
        return d
55 
}
56 
 
57 
func (d *digest) Size() int { return Size }
58 
 
59 
func (d *digest) BlockSize() int { return BlockSize }
60 
 
61 
func (d *digest) Write(p []byte) (nn int, err error) {
62 
        nn = len(p)
63 
        d.len += uint64(nn)
64 
        if d.nx > 0 {
65 
                n := len(p)
66 
                if n > _Chunk-d.nx {
67 
                        n = _Chunk - d.nx
68 
                }
69 
                for i := 0; i < n; i++ {
70 
                        d.x[d.nx+i] = p[i]
71 
                }
72 
                d.nx += n
73 
                if d.nx == _Chunk {
74 
                        _Block(d, d.x[0:])
75 
                        d.nx = 0
76 
                }
77 
                p = p[n:]
78 
        }
79 
        n := _Block(d, p)
80 
        p = p[n:]
81 
        if len(p) > 0 {
82 
                d.nx = copy(d.x[:], p)
83 
        }
84 
        return
85 
}
86 
 
87 
func (d0 *digest) Sum(in []byte) []byte {
88 
        // Make a copy of d0 so that caller can keep writing and summing.
89 
        d := *d0
90 
 
91 
        // Padding.  Add a 1 bit and 0 bits until 56 bytes mod 64.
92 
        len := d.len
93 
        var tmp [64]byte
94 
        tmp[0] = 0x80
95 
        if len%64 < 56 {
96 
                d.Write(tmp[0 : 56-len%64])
97 
        } else {
98 
                d.Write(tmp[0 : 64+56-len%64])
99 
        }
100 
 
101 
        // Length in bits.
102 
        len <<= 3
103 
        for i := uint(0); i < 8; i++ {
104 
                tmp[i] = byte(len >> (56 - 8*i))
105 
        }
106 
        d.Write(tmp[0:8])
107 
 
108 
        if d.nx != 0 {
109 
                panic("d.nx != 0")
110 
        }
111 
 
112 
        var digest [Size]byte
113 
        for i, s := range d.h {
114 
                digest[i*4] = byte(s >> 24)
115 
                digest[i*4+1] = byte(s >> 16)
116 
                digest[i*4+2] = byte(s >> 8)
117 
                digest[i*4+3] = byte(s)
118 
        }
119 
 
120 
        return append(in, digest[:]...)
121 
}

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.