summaryrefslogtreecommitdiff
path: root/source4/lib/crypto/sha256.c
blob: a2def25814824f4dc65ff03bd142e4114d981606 (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
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
/*
  based on heildal lib/hcrypto/sha256.c. Copied to lib/crypto to avoid a link
  problem. Hopefully will be removed once we solve this link problem

   (tridge)
 */

/*
 * Copyright (c) 2006 Kungliga Tekniska Högskolan
 * (Royal Institute of Technology, Stockholm, Sweden).
 * All rights reserved.
 * 
 * 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.
 * 
 * 3. Neither the name of the Institute nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``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 INSTITUTE OR CONTRIBUTORS 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 "includes.h"
#include "sha256.h"

#define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
#define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))

#define ROTR(x,n)   (((x)>>(n)) | ((x) << (32 - (n))))

#define Sigma0(x)	(ROTR(x,2)  ^ ROTR(x,13) ^ ROTR(x,22))
#define Sigma1(x)	(ROTR(x,6)  ^ ROTR(x,11) ^ ROTR(x,25))
#define sigma0(x)	(ROTR(x,7)  ^ ROTR(x,18) ^ ((x)>>3))
#define sigma1(x)	(ROTR(x,17) ^ ROTR(x,19) ^ ((x)>>10))

#define A m->counter[0]
#define B m->counter[1]
#define C m->counter[2]
#define D m->counter[3]
#define E m->counter[4]
#define F m->counter[5]
#define G m->counter[6]
#define H m->counter[7]

static const uint32_t constant_256[64] = {
    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
};

void
SHA256_Init (SHA256_CTX *m)
{
    m->sz[0] = 0;
    m->sz[1] = 0;
    A = 0x6a09e667;
    B = 0xbb67ae85;
    C = 0x3c6ef372;
    D = 0xa54ff53a;
    E = 0x510e527f;
    F = 0x9b05688c;
    G = 0x1f83d9ab;
    H = 0x5be0cd19;
}

static void
calc (SHA256_CTX *m, uint32_t *in)
{
    uint32_t AA, BB, CC, DD, EE, FF, GG, HH;
    uint32_t data[64];
    int i;

    AA = A;
    BB = B;
    CC = C;
    DD = D;
    EE = E;
    FF = F;
    GG = G;
    HH = H;

    for (i = 0; i < 16; ++i)
	data[i] = in[i];
    for (i = 16; i < 64; ++i)
	data[i] = sigma1(data[i-2]) + data[i-7] + 
	    sigma0(data[i-15]) + data[i - 16];

    for (i = 0; i < 64; i++) {
	uint32_t T1, T2;

	T1 = HH + Sigma1(EE) + Ch(EE, FF, GG) + constant_256[i] + data[i];
	T2 = Sigma0(AA) + Maj(AA,BB,CC);
			     
	HH = GG;
	GG = FF;
	FF = EE;
	EE = DD + T1;
	DD = CC;
	CC = BB;
	BB = AA;
	AA = T1 + T2;
    }

    A += AA;
    B += BB;
    C += CC;
    D += DD;
    E += EE;
    F += FF;
    G += GG;
    H += HH;
}

/*
 * From `Performance analysis of MD5' by Joseph D. Touch <touch@isi.edu>
 */

#if !defined(WORDS_BIGENDIAN) || defined(_CRAY)
/* Vector Crays doesn't have a good 32-bit type, or more precisely,
   int32_t as defined by <bind/bitypes.h> isn't 32 bits, and we don't
   want to depend in being able to redefine this type.  To cope with
   this we have to clamp the result in some places to [0,2^32); no
   need to do this on other machines.  Did I say this was a mess?
   */

#ifdef _CRAY
#define CRAYFIX(X) ((X) & 0xffffffff)
#else
#define CRAYFIX(X) (X)
#endif

static inline uint32_t
cshift (uint32_t x, unsigned int n)
{
    x = CRAYFIX(x);
    return CRAYFIX((x << n) | (x >> (32 - n)));
}

static inline uint32_t
swap_uint32_t (uint32_t t)
{
    uint32_t temp1, temp2;

    temp1   = cshift(t, 16);
    temp2   = temp1 >> 8;
    temp1  &= 0x00ff00ff;
    temp2  &= 0x00ff00ff;
    temp1 <<= 8;
    return temp1 | temp2;
}
#endif

struct x32{
    unsigned int a:32;
    unsigned int b:32;
};

void
SHA256_Update (SHA256_CTX *m, const void *v, size_t len)
{
    const unsigned char *p = v;
    size_t old_sz = m->sz[0];
    size_t offset;

    m->sz[0] += len * 8;
    if (m->sz[0] < old_sz)
	++m->sz[1];
    offset = (old_sz / 8) % 64;
    while(len > 0){
	size_t l = MIN(len, 64 - offset);
	memcpy(m->save + offset, p, l);
	offset += l;
	p += l;
	len -= l;
	if(offset == 64){
#if !defined(WORDS_BIGENDIAN) || defined(_CRAY)
	    int i;
	    uint32_t current[16];
	    struct x32 *u = (struct x32*)m->save;
	    for(i = 0; i < 8; i++){
		current[2*i+0] = swap_uint32_t(u[i].a);
		current[2*i+1] = swap_uint32_t(u[i].b);
	    }
	    calc(m, current);
#else
	    calc(m, (uint32_t*)m->save);
#endif
	    offset = 0;
	}
    }
}

void
SHA256_Final (void *res, SHA256_CTX *m)
{
    unsigned char zeros[72];
    unsigned offset = (m->sz[0] / 8) % 64;
    unsigned int dstart = (120 - offset - 1) % 64 + 1;

    *zeros = 0x80;
    memset (zeros + 1, 0, sizeof(zeros) - 1);
    zeros[dstart+7] = (m->sz[0] >> 0) & 0xff;
    zeros[dstart+6] = (m->sz[0] >> 8) & 0xff;
    zeros[dstart+5] = (m->sz[0] >> 16) & 0xff;
    zeros[dstart+4] = (m->sz[0] >> 24) & 0xff;
    zeros[dstart+3] = (m->sz[1] >> 0) & 0xff;
    zeros[dstart+2] = (m->sz[1] >> 8) & 0xff;
    zeros[dstart+1] = (m->sz[1] >> 16) & 0xff;
    zeros[dstart+0] = (m->sz[1] >> 24) & 0xff;
    SHA256_Update (m, zeros, dstart + 8);
    {
	int i;
	unsigned char *r = (unsigned char*)res;

	for (i = 0; i < 8; ++i) {
	    r[4*i+3] = m->counter[i] & 0xFF;
	    r[4*i+2] = (m->counter[i] >> 8) & 0xFF;
	    r[4*i+1] = (m->counter[i] >> 16) & 0xFF;
	    r[4*i]   = (m->counter[i] >> 24) & 0xFF;
	}
    }
}