This repository has been archived by the owner on Sep 20, 2023. It is now read-only.
-
Notifications
You must be signed in to change notification settings - Fork 24
/
sha256.c
175 lines (147 loc) · 5.58 KB
/
sha256.c
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
/*
* Copyright (C) 2006-2009 Vincent Hanquez <vincent@snarc.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <string.h>
#include "sha256.h"
#include "bitfn.h"
void sha224_init(struct sha224_ctx *ctx)
{
memset(ctx, 0, sizeof(*ctx));
ctx->h[0] = 0xc1059ed8;
ctx->h[1] = 0x367cd507;
ctx->h[2] = 0x3070dd17;
ctx->h[3] = 0xf70e5939;
ctx->h[4] = 0xffc00b31;
ctx->h[5] = 0x68581511;
ctx->h[6] = 0x64f98fa7;
ctx->h[7] = 0xbefa4fa4;
}
void sha256_init(struct sha256_ctx *ctx)
{
memset(ctx, 0, sizeof(*ctx));
ctx->h[0] = 0x6a09e667;
ctx->h[1] = 0xbb67ae85;
ctx->h[2] = 0x3c6ef372;
ctx->h[3] = 0xa54ff53a;
ctx->h[4] = 0x510e527f;
ctx->h[5] = 0x9b05688c;
ctx->h[6] = 0x1f83d9ab;
ctx->h[7] = 0x5be0cd19;
}
/* 232 times the cube root of the first 64 primes 2..311 */
static const uint32_t k[] = {
0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5, 0x3956c25b, 0x59f111f1,
0x923f82a4, 0xab1c5ed5, 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174, 0xe49b69c1, 0xefbe4786,
0x0fc19dc6, 0x240ca1cc, 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7, 0xc6e00bf3, 0xd5a79147,
0x06ca6351, 0x14292967, 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85, 0xa2bfe8a1, 0xa81a664b,
0xc24b8b70, 0xc76c51a3, 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5, 0x391c0cb3, 0x4ed8aa4a,
0x5b9cca4f, 0x682e6ff3, 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
};
#define e0(x) (ror32(x, 2) ^ ror32(x,13) ^ ror32(x,22))
#define e1(x) (ror32(x, 6) ^ ror32(x,11) ^ ror32(x,25))
#define s0(x) (ror32(x, 7) ^ ror32(x,18) ^ (x >> 3))
#define s1(x) (ror32(x,17) ^ ror32(x,19) ^ (x >> 10))
static void sha256_do_chunk(struct sha256_ctx *ctx, uint32_t buf[])
{
uint32_t a, b, c, d, e, f, g, h, t1, t2;
int i;
uint32_t w[64];
cpu_to_be32_array(w, buf, 16);
for (i = 16; i < 64; i++)
w[i] = s1(w[i - 2]) + w[i - 7] + s0(w[i - 15]) + w[i - 16];
a = ctx->h[0]; b = ctx->h[1]; c = ctx->h[2]; d = ctx->h[3];
e = ctx->h[4]; f = ctx->h[5]; g = ctx->h[6]; h = ctx->h[7];
#define R(a, b, c, d, e, f, g, h, k, w) \
t1 = h + e1(e) + (g ^ (e & (f ^ g))) + k + w; \
t2 = e0(a) + ((a & b) | (c & (a | b))); \
d += t1; \
h = t1 + t2;
for (i = 0; i < 64; i += 8) {
R(a, b, c, d, e, f, g, h, k[i + 0], w[i + 0]);
R(h, a, b, c, d, e, f, g, k[i + 1], w[i + 1]);
R(g, h, a, b, c, d, e, f, k[i + 2], w[i + 2]);
R(f, g, h, a, b, c, d, e, k[i + 3], w[i + 3]);
R(e, f, g, h, a, b, c, d, k[i + 4], w[i + 4]);
R(d, e, f, g, h, a, b, c, k[i + 5], w[i + 5]);
R(c, d, e, f, g, h, a, b, k[i + 6], w[i + 6]);
R(b, c, d, e, f, g, h, a, k[i + 7], w[i + 7]);
}
#undef R
ctx->h[0] += a; ctx->h[1] += b; ctx->h[2] += c; ctx->h[3] += d;
ctx->h[4] += e; ctx->h[5] += f; ctx->h[6] += g; ctx->h[7] += h;
}
void sha224_update(struct sha224_ctx *ctx, uint8_t *data, uint32_t len)
{
return sha256_update(ctx, data, len);
}
void sha256_update(struct sha256_ctx *ctx, uint8_t *data, uint32_t len)
{
uint32_t index, to_fill;
/* check for partial buffer */
index = (uint32_t) (ctx->sz & 0x3f);
to_fill = 64 - index;
ctx->sz += len;
/* process partial buffer if there's enough data to make a block */
if (index && len >= to_fill) {
memcpy(ctx->buf + index, data, to_fill);
sha256_do_chunk(ctx, (uint32_t *) ctx->buf);
len -= to_fill;
data += to_fill;
index = 0;
}
/* process as much 64-block as possible */
for (; len >= 64; len -= 64, data += 64)
sha256_do_chunk(ctx, (uint32_t *) data);
/* append data into buf */
if (len)
memcpy(ctx->buf + index, data, len);
}
void sha224_finalize(struct sha224_ctx *ctx, uint8_t *out)
{
uint8_t intermediate[SHA256_DIGEST_SIZE];
sha256_finalize(ctx, intermediate);
memcpy(out, intermediate, SHA224_DIGEST_SIZE);
}
void sha256_finalize(struct sha256_ctx *ctx, uint8_t *out)
{
static uint8_t padding[64] = { 0x80, };
uint64_t bits;
uint32_t i, index, padlen;
uint32_t *p = (uint32_t *) out;
/* cpu -> big endian */
bits = cpu_to_be64(ctx->sz << 3);
/* pad out to 56 */
index = (uint32_t) (ctx->sz & 0x3f);
padlen = (index < 56) ? (56 - index) : ((64 + 56) - index);
sha256_update(ctx, padding, padlen);
/* append length */
sha256_update(ctx, (uint8_t *) &bits, sizeof(bits));
/* store to digest */
for (i = 0; i < 8; i++)
p[i] = cpu_to_be32(ctx->h[i]);
}