1/* Crypto/Sha256.c -- SHA-256 Hash
22010-06-11 : Igor Pavlov : Public domain
3This code is based on public domain code from Wei Dai's Crypto++ library. */
4
5#include "rotate-bits/rotate-bits.h"
6#include "sha256.h"
7
8/* define it for speed optimization */
9#define _SHA256_UNROLL
10#define _SHA256_UNROLL2
11
12void
13sha256_init(sha256_t *p)
14{
15 p->state[0] = 0x6a09e667;
16 p->state[1] = 0xbb67ae85;
17 p->state[2] = 0x3c6ef372;
18 p->state[3] = 0xa54ff53a;
19 p->state[4] = 0x510e527f;
20 p->state[5] = 0x9b05688c;
21 p->state[6] = 0x1f83d9ab;
22 p->state[7] = 0x5be0cd19;
23 p->count = 0;
24}
25
26#define S0(x) (ROTR32(x, 2) ^ ROTR32(x,13) ^ ROTR32(x, 22))
27#define S1(x) (ROTR32(x, 6) ^ ROTR32(x,11) ^ ROTR32(x, 25))
28#define s0(x) (ROTR32(x, 7) ^ ROTR32(x,18) ^ (x >> 3))
29#define s1(x) (ROTR32(x,17) ^ ROTR32(x,19) ^ (x >> 10))
30
31#define blk0(i) (W[i] = data[i])
32#define blk2(i) (W[i&15] += s1(W[(i-2)&15]) + W[(i-7)&15] + s0(W[(i-15)&15]))
33
34#define Ch(x,y,z) (z^(x&(y^z)))
35#define Maj(x,y,z) ((x&y)|(z&(x|y)))
36
37#define a(i) T[(0-(i))&7]
38#define b(i) T[(1-(i))&7]
39#define c(i) T[(2-(i))&7]
40#define d(i) T[(3-(i))&7]
41#define e(i) T[(4-(i))&7]
42#define f(i) T[(5-(i))&7]
43#define g(i) T[(6-(i))&7]
44#define h(i) T[(7-(i))&7]
45
46
47#ifdef _SHA256_UNROLL2
48
49#define R(a,b,c,d,e,f,g,h, i) h += S1(e) + Ch(e,f,g) + K[i+j] + (j?blk2(i):blk0(i));\
50 d += h; h += S0(a) + Maj(a, b, c)
51
52#define RX_8(i) \
53 R(a,b,c,d,e,f,g,h, i); \
54 R(h,a,b,c,d,e,f,g, (i+1)); \
55 R(g,h,a,b,c,d,e,f, (i+2)); \
56 R(f,g,h,a,b,c,d,e, (i+3)); \
57 R(e,f,g,h,a,b,c,d, (i+4)); \
58 R(d,e,f,g,h,a,b,c, (i+5)); \
59 R(c,d,e,f,g,h,a,b, (i+6)); \
60 R(b,c,d,e,f,g,h,a, (i+7))
61
62#else
63
64#define R(i) h(i) += S1(e(i)) + Ch(e(i),f(i),g(i)) + K[i+j] + (j?blk2(i):blk0(i));\
65 d(i) += h(i); h(i) += S0(a(i)) + Maj(a(i), b(i), c(i))
66
67#ifdef _SHA256_UNROLL
68
69#define RX_8(i) R(i+0); R(i+1); R(i+2); R(i+3); R(i+4); R(i+5); R(i+6); R(i+7);
70
71#endif
72
73#endif
74
75static const uint32_t K[64] = {
76 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
77 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
78 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
79 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
80 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
81 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
82 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
83 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
84 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
85 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
86 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
87 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
88 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
89 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
90 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
91 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
92};
93
94static void
95sha256_transform(uint32_t *state, const uint32_t *data)
96{
97 uint32_t W[16] = {0};
98 unsigned j;
99 #ifdef _SHA256_UNROLL2
100 uint32_t a,b,c,d,e,f,g,h;
101 a = state[0];
102 b = state[1];
103 c = state[2];
104 d = state[3];
105 e = state[4];
106 f = state[5];
107 g = state[6];
108 h = state[7];
109 #else
110 uint32_t T[8];
111 for (j = 0; j < 8; j++)
112 T[j] = state[j];
113 #endif
114
115 for (j = 0; j < 64; j += 16)
116 {
117 #if defined(_SHA256_UNROLL) || defined(_SHA256_UNROLL2)
118 RX_8(0); RX_8(8);
119 #else
120 unsigned i;
121 for (i = 0; i < 16; i++) { R(i); }
122 #endif
123 }
124
125 #ifdef _SHA256_UNROLL2
126 state[0] += a;
127 state[1] += b;
128 state[2] += c;
129 state[3] += d;
130 state[4] += e;
131 state[5] += f;
132 state[6] += g;
133 state[7] += h;
134 #else
135 for (j = 0; j < 8; j++)
136 state[j] += T[j];
137 #endif
138
139 /* Wipe variables */
140 /* memset(W, 0, sizeof(W)); */
141 /* memset(T, 0, sizeof(T)); */
142}
143
144#undef S0
145#undef S1
146#undef s0
147#undef s1
148
149static void
150sha256_write_byte_block(sha256_t *p)
151{
152 uint32_t data32[16];
153 unsigned i;
154 for (i = 0; i < 16; i++)
155 data32[i] =
156 ((uint32_t)(p->buffer[i * 4 ]) << 24) +
157 ((uint32_t)(p->buffer[i * 4 + 1]) << 16) +
158 ((uint32_t)(p->buffer[i * 4 + 2]) << 8) +
159 ((uint32_t)(p->buffer[i * 4 + 3]));
160 sha256_transform(p->state, data32);
161}
162
163
164void
165sha256_hash(unsigned char *buf, const unsigned char *data, size_t size)
166{
167 sha256_t hash;
168 sha256_init(&hash);
169 sha256_update(&hash, data, size);
170 sha256_final(&hash, buf);
171}
172
173
174void
175sha256_update(sha256_t *p, const unsigned char *data, size_t size)
176{
177 uint32_t curBufferPos = (uint32_t)p->count & 0x3F;
178 while (size > 0)
179 {
180 p->buffer[curBufferPos++] = *data++;
181 p->count++;
182 size--;
183 if (curBufferPos == 64)
184 {
185 curBufferPos = 0;
186 sha256_write_byte_block(p);
187 }
188 }
189}
190
191
192void
193sha256_final(sha256_t *p, unsigned char *digest)
194{
195 uint64_t lenInBits = (p->count << 3);
196 uint32_t curBufferPos = (uint32_t)p->count & 0x3F;
197 unsigned i;
198 p->buffer[curBufferPos++] = 0x80;
199 while (curBufferPos != (64 - 8))
200 {
201 curBufferPos &= 0x3F;
202 if (curBufferPos == 0)
203 sha256_write_byte_block(p);
204 p->buffer[curBufferPos++] = 0;
205 }
206 for (i = 0; i < 8; i++)
207 {
208 p->buffer[curBufferPos++] = (unsigned char)(lenInBits >> 56);
209 lenInBits <<= 8;
210 }
211 sha256_write_byte_block(p);
212
213 for (i = 0; i < 8; i++)
214 {
215 *digest++ = (unsigned char)(p->state[i] >> 24);
216 *digest++ = (unsigned char)(p->state[i] >> 16);
217 *digest++ = (unsigned char)(p->state[i] >> 8);
218 *digest++ = (unsigned char)(p->state[i]);
219 }
220 sha256_init(p);
221}