2 * Copyright (c) 2006 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
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37 RCSID("$Id: sha256.c,v 1.2 2006/05/05 10:25:37 lha Exp $");
43 #define Ch(x,y,z) (((x) & (y)) ^ ((~(x)) & (z)))
44 #define Maj(x,y,z) (((x) & (y)) ^ ((x) & (z)) ^ ((y) & (z)))
46 #define ROTR(x,n) (((x)>>(n)) | ((x) << (32 - (n))))
48 #define Sigma0(x) (ROTR(x,2) ^ ROTR(x,13) ^ ROTR(x,22))
49 #define Sigma1(x) (ROTR(x,6) ^ ROTR(x,11) ^ ROTR(x,25))
50 #define sigma0(x) (ROTR(x,7) ^ ROTR(x,18) ^ ((x)>>3))
51 #define sigma1(x) (ROTR(x,17) ^ ROTR(x,19) ^ ((x)>>10))
53 #define A m->counter[0]
54 #define B m->counter[1]
55 #define C m->counter[2]
56 #define D m->counter[3]
57 #define E m->counter[4]
58 #define F m->counter[5]
59 #define G m->counter[6]
60 #define H m->counter[7]
62 static const uint32_t constant_256[64] = {
63 0x428a2f98, 0x71374491, 0xb5c0fbcf, 0xe9b5dba5,
64 0x3956c25b, 0x59f111f1, 0x923f82a4, 0xab1c5ed5,
65 0xd807aa98, 0x12835b01, 0x243185be, 0x550c7dc3,
66 0x72be5d74, 0x80deb1fe, 0x9bdc06a7, 0xc19bf174,
67 0xe49b69c1, 0xefbe4786, 0x0fc19dc6, 0x240ca1cc,
68 0x2de92c6f, 0x4a7484aa, 0x5cb0a9dc, 0x76f988da,
69 0x983e5152, 0xa831c66d, 0xb00327c8, 0xbf597fc7,
70 0xc6e00bf3, 0xd5a79147, 0x06ca6351, 0x14292967,
71 0x27b70a85, 0x2e1b2138, 0x4d2c6dfc, 0x53380d13,
72 0x650a7354, 0x766a0abb, 0x81c2c92e, 0x92722c85,
73 0xa2bfe8a1, 0xa81a664b, 0xc24b8b70, 0xc76c51a3,
74 0xd192e819, 0xd6990624, 0xf40e3585, 0x106aa070,
75 0x19a4c116, 0x1e376c08, 0x2748774c, 0x34b0bcb5,
76 0x391c0cb3, 0x4ed8aa4a, 0x5b9cca4f, 0x682e6ff3,
77 0x748f82ee, 0x78a5636f, 0x84c87814, 0x8cc70208,
78 0x90befffa, 0xa4506ceb, 0xbef9a3f7, 0xc67178f2
82 SHA256_Init (SHA256_CTX *m)
97 calc (SHA256_CTX *m, uint32_t *in)
99 uint32_t AA, BB, CC, DD, EE, FF, GG, HH;
112 for (i = 0; i < 16; ++i)
114 for (i = 16; i < 64; ++i)
115 data[i] = sigma1(data[i-2]) + data[i-7] +
116 sigma0(data[i-15]) + data[i - 16];
118 for (i = 0; i < 64; i++) {
121 T1 = HH + Sigma1(EE) + Ch(EE, FF, GG) + constant_256[i] + data[i];
122 T2 = Sigma0(AA) + Maj(AA,BB,CC);
145 * From `Performance analysis of MD5' by Joseph D. Touch <touch@isi.edu>
148 #if !defined(WORDS_BIGENDIAN) || defined(_CRAY)
149 static inline uint32_t
150 swap_uint32_t (uint32_t t)
152 #define ROL(x,n) ((x)<<(n))|((x)>>(32-(n)))
153 uint32_t temp1, temp2;
155 temp1 = cshift(t, 16);
160 return temp1 | temp2;
170 SHA256_Update (SHA256_CTX *m, const void *v, size_t len)
172 const unsigned char *p = v;
173 size_t old_sz = m->sz[0];
177 if (m->sz[0] < old_sz)
179 offset = (old_sz / 8) % 64;
181 size_t l = min(len, 64 - offset);
182 memcpy(m->save + offset, p, l);
187 #if !defined(WORDS_BIGENDIAN) || defined(_CRAY)
189 uint32_t current[16];
190 struct x32 *u = (struct x32*)m->save;
191 for(i = 0; i < 8; i++){
192 current[2*i+0] = swap_uint32_t(u[i].a);
193 current[2*i+1] = swap_uint32_t(u[i].b);
197 calc(m, (uint32_t*)m->save);
205 SHA256_Final (void *res, SHA256_CTX *m)
207 unsigned char zeros[72];
208 unsigned offset = (m->sz[0] / 8) % 64;
209 unsigned int dstart = (120 - offset - 1) % 64 + 1;
212 memset (zeros + 1, 0, sizeof(zeros) - 1);
213 zeros[dstart+7] = (m->sz[0] >> 0) & 0xff;
214 zeros[dstart+6] = (m->sz[0] >> 8) & 0xff;
215 zeros[dstart+5] = (m->sz[0] >> 16) & 0xff;
216 zeros[dstart+4] = (m->sz[0] >> 24) & 0xff;
217 zeros[dstart+3] = (m->sz[1] >> 0) & 0xff;
218 zeros[dstart+2] = (m->sz[1] >> 8) & 0xff;
219 zeros[dstart+1] = (m->sz[1] >> 16) & 0xff;
220 zeros[dstart+0] = (m->sz[1] >> 24) & 0xff;
221 SHA256_Update (m, zeros, dstart + 8);
224 unsigned char *r = (unsigned char*)res;
226 for (i = 0; i < 8; ++i) {
227 r[4*i+3] = m->counter[i] & 0xFF;
228 r[4*i+2] = (m->counter[i] >> 8) & 0xFF;
229 r[4*i+1] = (m->counter[i] >> 16) & 0xFF;
230 r[4*i] = (m->counter[i] >> 24) & 0xFF;