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
|
/* sha256.c
*
* The sha256 hash function.
*
* See http://csrc.nist.gov/publications/fips/fips180-2/fips180-2.pdf
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2001 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
/* Modelled after the sha1.c code by Peter Gutmann. */
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "sha.h"
#include "macros.h"
#include "nettle-write.h"
/* Generated by the shadata program. */
static const uint32_t
K[64] =
{
0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
0xd807aa98UL, 0x12835b01UL, 0x243185beUL, 0x550c7dc3UL,
0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL, 0xc19bf174UL,
0xe49b69c1UL, 0xefbe4786UL, 0xfc19dc6UL, 0x240ca1ccUL,
0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL,
0x983e5152UL, 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL,
0xc6e00bf3UL, 0xd5a79147UL, 0x6ca6351UL, 0x14292967UL,
0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL, 0x53380d13UL,
0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL,
0xd192e819UL, 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL,
0x19a4c116UL, 0x1e376c08UL, 0x2748774cUL, 0x34b0bcb5UL,
0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL, 0x682e6ff3UL,
0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL,
};
#define COMPRESS(digest, data) (_nettle_sha256_compress((digest), (data), K))
/* Initialize the SHA values */
void
sha256_init(struct sha256_ctx *ctx)
{
/* Initial values, also generated by the shadata program. */
static const uint32_t H0[_SHA256_DIGEST_LENGTH] =
{
0x6a09e667UL, 0xbb67ae85UL, 0x3c6ef372UL, 0xa54ff53aUL,
0x510e527fUL, 0x9b05688cUL, 0x1f83d9abUL, 0x5be0cd19UL,
};
memcpy(ctx->state, H0, sizeof(H0));
/* Initialize bit count */
ctx->count_low = ctx->count_high = 0;
/* Initialize buffer */
ctx->index = 0;
}
void
sha256_update(struct sha256_ctx *ctx,
unsigned length, const uint8_t *data)
{
MD_UPDATE (ctx, length, data, COMPRESS);
}
static void
sha256_write_digest(struct sha256_ctx *ctx,
unsigned length,
uint8_t *digest)
{
assert(length <= SHA256_DIGEST_SIZE);
MD_FINAL(ctx, 32, 9, COMPRESS, WRITE_UINT32);
_nettle_write_be32(length, digest, ctx->state);
}
void
sha256_digest(struct sha256_ctx *ctx,
unsigned length,
uint8_t *digest)
{
sha256_write_digest(ctx, length, digest);
sha256_init(ctx);
}
/* sha224 variant. FIXME: Move to seperate file? */
void
sha224_init(struct sha256_ctx *ctx)
{
/* Initial values. I's unclear how they are chosen. */
static const uint32_t H0[_SHA256_DIGEST_LENGTH] =
{
0xc1059ed8, 0x367cd507, 0x3070dd17, 0xf70e5939,
0xffc00b31, 0x68581511, 0x64f98fa7, 0xbefa4fa4,
};
memcpy(ctx->state, H0, sizeof(H0));
/* Initialize bit count */
ctx->count_low = ctx->count_high = 0;
/* Initialize buffer */
ctx->index = 0;
}
void
sha224_digest(struct sha256_ctx *ctx,
unsigned length,
uint8_t *digest)
{
sha256_write_digest(ctx, length, digest);
sha224_init(ctx);
}
|
