5 const struct _hash_descriptor sha256_desc =
18 static const unsigned long K[64] = {
19 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL,
20 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL,
21 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL,
22 0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
23 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL,
24 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL,
25 0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL,
26 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
27 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL,
28 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL,
29 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL,
30 0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
31 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
34 /* Various logical functions */
35 #define Ch(x,y,z) (z ^ (x & (y ^ z)))
36 #define Maj(x,y,z) (((x | y) & z) | (x & y))
37 #define S(x, n) ROR((x),(n))
38 #define R(x, n) (((x)&0xFFFFFFFFUL)>>(n))
39 #define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
40 #define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
41 #define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
42 #define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
44 /* compress 512-bits */
46 static void _sha256_compress(hash_state * md)
48 static void sha256_compress(hash_state * md)
51 unsigned long S[8], W[64], t0, t1;
56 /* copy state into S */
57 for (i = 0; i < 8; i++)
58 S[i] = md->sha256.state[i];
60 /* copy the state into 512-bits into W[0..15] */
61 for (i = 0; i < 16; i++) {
62 LOAD32H(W[i], md->sha256.buf + (4*i));
66 for (i = 16; i < 64; i++) {
67 W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
71 for (i = 0; i < 64; i++) {
72 t0 = S[7] + Sigma1(S[4]) + Ch(S[4], S[5], S[6]) + K[i] + W[i];
73 t1 = Sigma0(S[0]) + Maj(S[0], S[1], S[2]);
85 for (i = 0; i < 8; i++) {
86 md->sha256.state[i] = md->sha256.state[i] + S[i];
92 static void sha256_compress(hash_state * md)
95 burn_stack(sizeof(unsigned long) * 74);
99 /* init the sha256 state */
100 void sha256_init(hash_state * md)
104 md->sha256.curlen = 0;
105 md->sha256.length = 0;
106 md->sha256.state[0] = 0x6A09E667UL;
107 md->sha256.state[1] = 0xBB67AE85UL;
108 md->sha256.state[2] = 0x3C6EF372UL;
109 md->sha256.state[3] = 0xA54FF53AUL;
110 md->sha256.state[4] = 0x510E527FUL;
111 md->sha256.state[5] = 0x9B05688CUL;
112 md->sha256.state[6] = 0x1F83D9ABUL;
113 md->sha256.state[7] = 0x5BE0CD19UL;
116 void sha256_process(hash_state * md, const unsigned char *buf, unsigned long len)
120 _ARGCHK(buf != NULL);
123 n = MIN(len, (64 - md->sha256.curlen));
124 memcpy(md->sha256.buf + md->sha256.curlen, buf, (size_t)n);
125 md->sha256.curlen += n;
129 /* is 64 bytes full? */
130 if (md->sha256.curlen == 64) {
132 md->sha256.length += 512;
133 md->sha256.curlen = 0;
138 void sha256_done(hash_state * md, unsigned char *hash)
143 _ARGCHK(hash != NULL);
145 /* increase the length of the message */
146 md->sha256.length += md->sha256.curlen * 8;
148 /* append the '1' bit */
149 md->sha256.buf[md->sha256.curlen++] = (unsigned char)0x80;
151 /* if the length is currently above 56 bytes we append zeros
152 * then compress. Then we can fall back to padding zeros and length
153 * encoding like normal.
155 if (md->sha256.curlen > 56) {
156 while (md->sha256.curlen < 64) {
157 md->sha256.buf[md->sha256.curlen++] = (unsigned char)0;
160 md->sha256.curlen = 0;
163 /* pad upto 56 bytes of zeroes */
164 while (md->sha256.curlen < 56) {
165 md->sha256.buf[md->sha256.curlen++] = (unsigned char)0;
169 STORE64H(md->sha256.length, md->sha256.buf+56);
173 for (i = 0; i < 8; i++) {
174 STORE32H(md->sha256.state[i], hash+(4*i));
177 zeromem(md, sizeof(hash_state));
181 int sha256_test(void)
186 static const struct {
188 unsigned char hash[32];
191 { 0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea,
192 0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23,
193 0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c,
194 0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad }
196 { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
197 { 0x24, 0x8d, 0x6a, 0x61, 0xd2, 0x06, 0x38, 0xb8,
198 0xe5, 0xc0, 0x26, 0x93, 0x0c, 0x3e, 0x60, 0x39,
199 0xa3, 0x3c, 0xe4, 0x59, 0x64, 0xff, 0x21, 0x67,
200 0xf6, 0xec, 0xed, 0xd4, 0x19, 0xdb, 0x06, 0xc1 }
205 unsigned char tmp[32];
208 for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
210 sha256_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg));
211 sha256_done(&md, tmp);
212 if (memcmp(tmp, tests[i].hash, 32) != 0) {
213 return CRYPT_FAIL_TESTVECTOR;