blob: bca7a91e22ec551ad8c3bd20192f547526f7f340 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
|
// 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 SHA384 and SHA512 hash algorithms as defined
// in FIPS 180-2.
package sha512
import (
"crypto"
"hash"
)
func init() {
crypto.RegisterHash(crypto.SHA384, New384)
crypto.RegisterHash(crypto.SHA512, New)
}
// The size of a SHA512 checksum in bytes.
const Size = 64
// The size of a SHA384 checksum in bytes.
const Size384 = 48
// The blocksize of SHA512 and SHA384 in bytes.
const BlockSize = 128
const (
chunk = 128
init0 = 0x6a09e667f3bcc908
init1 = 0xbb67ae8584caa73b
init2 = 0x3c6ef372fe94f82b
init3 = 0xa54ff53a5f1d36f1
init4 = 0x510e527fade682d1
init5 = 0x9b05688c2b3e6c1f
init6 = 0x1f83d9abfb41bd6b
init7 = 0x5be0cd19137e2179
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
is384 bool // mark if this digest is SHA-384
}
func (d *digest) Reset() {
if !d.is384 {
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
} else {
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
}
d.nx = 0
d.len = 0
}
// New returns a new hash.Hash computing the SHA512 checksum.
func New() hash.Hash {
d := new(digest)
d.Reset()
return d
}
// New384 returns a new hash.Hash computing the SHA384 checksum.
func New384() hash.Hash {
d := new(digest)
d.is384 = true
d.Reset()
return d
}
func (d *digest) Size() int {
if !d.is384 {
return Size
}
return Size384
}
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()
if d.is384 {
return append(in, hash[:Size384]...)
}
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.is384 {
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 {
var d digest
d.Reset()
d.Write(data)
return d.checkSum()
}
// Sum384 returns the SHA384 checksum of the data.
func Sum384(data []byte) (sum384 [Size384]byte) {
var d digest
d.is384 = true
d.Reset()
d.Write(data)
sum := d.checkSum()
copy(sum384[:], sum[:Size384])
return
}
|
