1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis */
2 /* SPDX-License-Identifier: Unlicense */
3 #include "tomcrypt_private.h"
4
5 /**
6 @file sha256.c
7 LTC_SHA256 by Tom St Denis
8 */
9
10 #ifdef LTC_SHA256
11
12 const struct ltc_hash_descriptor sha256_desc =
13 {
14 "sha256",
15 0,
16 32,
17 64,
18
19 /* OID */
20 { 2, 16, 840, 1, 101, 3, 4, 2, 1, },
21 9,
22
23 &sha256_init,
24 &sha256_process,
25 &sha256_done,
26 &sha256_test,
27 NULL
28 };
29
30 #ifdef LTC_SMALL_CODE
31 /* the K array */
32 static const ulong32 K[64] = {
33 0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL, 0x3956c25bUL,
34 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL, 0xd807aa98UL, 0x12835b01UL,
35 0x243185beUL, 0x550c7dc3UL, 0x72be5d74UL, 0x80deb1feUL, 0x9bdc06a7UL,
36 0xc19bf174UL, 0xe49b69c1UL, 0xefbe4786UL, 0x0fc19dc6UL, 0x240ca1ccUL,
37 0x2de92c6fUL, 0x4a7484aaUL, 0x5cb0a9dcUL, 0x76f988daUL, 0x983e5152UL,
38 0xa831c66dUL, 0xb00327c8UL, 0xbf597fc7UL, 0xc6e00bf3UL, 0xd5a79147UL,
39 0x06ca6351UL, 0x14292967UL, 0x27b70a85UL, 0x2e1b2138UL, 0x4d2c6dfcUL,
40 0x53380d13UL, 0x650a7354UL, 0x766a0abbUL, 0x81c2c92eUL, 0x92722c85UL,
41 0xa2bfe8a1UL, 0xa81a664bUL, 0xc24b8b70UL, 0xc76c51a3UL, 0xd192e819UL,
42 0xd6990624UL, 0xf40e3585UL, 0x106aa070UL, 0x19a4c116UL, 0x1e376c08UL,
43 0x2748774cUL, 0x34b0bcb5UL, 0x391c0cb3UL, 0x4ed8aa4aUL, 0x5b9cca4fUL,
44 0x682e6ff3UL, 0x748f82eeUL, 0x78a5636fUL, 0x84c87814UL, 0x8cc70208UL,
45 0x90befffaUL, 0xa4506cebUL, 0xbef9a3f7UL, 0xc67178f2UL
46 };
47 #endif
48
49 /* Various logical functions */
50 #define Ch(x,y,z) (z ^ (x & (y ^ z)))
51 #define Maj(x,y,z) (((x | y) & z) | (x & y))
52 #define S(x, n) RORc((x),(n))
53 #define R(x, n) (((x)&0xFFFFFFFFUL)>>(n))
54 #define Sigma0(x) (S(x, 2) ^ S(x, 13) ^ S(x, 22))
55 #define Sigma1(x) (S(x, 6) ^ S(x, 11) ^ S(x, 25))
56 #define Gamma0(x) (S(x, 7) ^ S(x, 18) ^ R(x, 3))
57 #define Gamma1(x) (S(x, 17) ^ S(x, 19) ^ R(x, 10))
58
59 /* compress 512-bits */
60 #ifdef LTC_CLEAN_STACK
ss_sha256_compress(hash_state * md,const unsigned char * buf)61 static int ss_sha256_compress(hash_state * md, const unsigned char *buf)
62 #else
63 static int s_sha256_compress(hash_state * md, const unsigned char *buf)
64 #endif
65 {
66 ulong32 S[8], W[64], t0, t1;
67 #ifdef LTC_SMALL_CODE
68 ulong32 t;
69 #endif
70 int i;
71
72 /* copy state into S */
73 for (i = 0; i < 8; i++) {
74 S[i] = md->sha256.state[i];
75 }
76
77 /* copy the state into 512-bits into W[0..15] */
78 for (i = 0; i < 16; i++) {
79 LOAD32H(W[i], buf + (4*i));
80 }
81
82 /* fill W[16..63] */
83 for (i = 16; i < 64; i++) {
84 W[i] = Gamma1(W[i - 2]) + W[i - 7] + Gamma0(W[i - 15]) + W[i - 16];
85 }
86
87 /* Compress */
88 #ifdef LTC_SMALL_CODE
89 #define RND(a,b,c,d,e,f,g,h,i) \
90 t0 = h + Sigma1(e) + Ch(e, f, g) + K[i] + W[i]; \
91 t1 = Sigma0(a) + Maj(a, b, c); \
92 d += t0; \
93 h = t0 + t1;
94
95 for (i = 0; i < 64; ++i) {
96 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],i);
97 t = S[7]; S[7] = S[6]; S[6] = S[5]; S[5] = S[4];
98 S[4] = S[3]; S[3] = S[2]; S[2] = S[1]; S[1] = S[0]; S[0] = t;
99 }
100 #else
101 #define RND(a,b,c,d,e,f,g,h,i,ki) \
102 t0 = h + Sigma1(e) + Ch(e, f, g) + ki + W[i]; \
103 t1 = Sigma0(a) + Maj(a, b, c); \
104 d += t0; \
105 h = t0 + t1;
106
107 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],0,0x428a2f98);
108 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],1,0x71374491);
109 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],2,0xb5c0fbcf);
110 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],3,0xe9b5dba5);
111 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],4,0x3956c25b);
112 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],5,0x59f111f1);
113 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],6,0x923f82a4);
114 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],7,0xab1c5ed5);
115 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],8,0xd807aa98);
116 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],9,0x12835b01);
117 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],10,0x243185be);
118 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],11,0x550c7dc3);
119 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],12,0x72be5d74);
120 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],13,0x80deb1fe);
121 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],14,0x9bdc06a7);
122 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],15,0xc19bf174);
123 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],16,0xe49b69c1);
124 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],17,0xefbe4786);
125 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],18,0x0fc19dc6);
126 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],19,0x240ca1cc);
127 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],20,0x2de92c6f);
128 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],21,0x4a7484aa);
129 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],22,0x5cb0a9dc);
130 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],23,0x76f988da);
131 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],24,0x983e5152);
132 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],25,0xa831c66d);
133 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],26,0xb00327c8);
134 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],27,0xbf597fc7);
135 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],28,0xc6e00bf3);
136 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],29,0xd5a79147);
137 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],30,0x06ca6351);
138 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],31,0x14292967);
139 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],32,0x27b70a85);
140 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],33,0x2e1b2138);
141 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],34,0x4d2c6dfc);
142 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],35,0x53380d13);
143 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],36,0x650a7354);
144 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],37,0x766a0abb);
145 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],38,0x81c2c92e);
146 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],39,0x92722c85);
147 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],40,0xa2bfe8a1);
148 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],41,0xa81a664b);
149 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],42,0xc24b8b70);
150 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],43,0xc76c51a3);
151 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],44,0xd192e819);
152 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],45,0xd6990624);
153 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],46,0xf40e3585);
154 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],47,0x106aa070);
155 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],48,0x19a4c116);
156 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],49,0x1e376c08);
157 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],50,0x2748774c);
158 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],51,0x34b0bcb5);
159 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],52,0x391c0cb3);
160 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],53,0x4ed8aa4a);
161 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],54,0x5b9cca4f);
162 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],55,0x682e6ff3);
163 RND(S[0],S[1],S[2],S[3],S[4],S[5],S[6],S[7],56,0x748f82ee);
164 RND(S[7],S[0],S[1],S[2],S[3],S[4],S[5],S[6],57,0x78a5636f);
165 RND(S[6],S[7],S[0],S[1],S[2],S[3],S[4],S[5],58,0x84c87814);
166 RND(S[5],S[6],S[7],S[0],S[1],S[2],S[3],S[4],59,0x8cc70208);
167 RND(S[4],S[5],S[6],S[7],S[0],S[1],S[2],S[3],60,0x90befffa);
168 RND(S[3],S[4],S[5],S[6],S[7],S[0],S[1],S[2],61,0xa4506ceb);
169 RND(S[2],S[3],S[4],S[5],S[6],S[7],S[0],S[1],62,0xbef9a3f7);
170 RND(S[1],S[2],S[3],S[4],S[5],S[6],S[7],S[0],63,0xc67178f2);
171 #endif
172 #undef RND
173
174 /* feedback */
175 for (i = 0; i < 8; i++) {
176 md->sha256.state[i] = md->sha256.state[i] + S[i];
177 }
178 return CRYPT_OK;
179 }
180
181 #ifdef LTC_CLEAN_STACK
s_sha256_compress(hash_state * md,const unsigned char * buf)182 static int s_sha256_compress(hash_state * md, const unsigned char *buf)
183 {
184 int err;
185 err = ss_sha256_compress(md, buf);
186 burn_stack(sizeof(ulong32) * 74);
187 return err;
188 }
189 #endif
190
191 /**
192 Initialize the hash state
193 @param md The hash state you wish to initialize
194 @return CRYPT_OK if successful
195 */
sha256_init(hash_state * md)196 int sha256_init(hash_state * md)
197 {
198 LTC_ARGCHK(md != NULL);
199
200 md->sha256.curlen = 0;
201 md->sha256.length = 0;
202 md->sha256.state[0] = 0x6A09E667UL;
203 md->sha256.state[1] = 0xBB67AE85UL;
204 md->sha256.state[2] = 0x3C6EF372UL;
205 md->sha256.state[3] = 0xA54FF53AUL;
206 md->sha256.state[4] = 0x510E527FUL;
207 md->sha256.state[5] = 0x9B05688CUL;
208 md->sha256.state[6] = 0x1F83D9ABUL;
209 md->sha256.state[7] = 0x5BE0CD19UL;
210 return CRYPT_OK;
211 }
212
213 /**
214 Process a block of memory though the hash
215 @param md The hash state
216 @param in The data to hash
217 @param inlen The length of the data (octets)
218 @return CRYPT_OK if successful
219 */
220 HASH_PROCESS(sha256_process,s_sha256_compress, sha256, 64)
221
222 /**
223 Terminate the hash to get the digest
224 @param md The hash state
225 @param out [out] The destination of the hash (32 bytes)
226 @return CRYPT_OK if successful
227 */
sha256_done(hash_state * md,unsigned char * out)228 int sha256_done(hash_state * md, unsigned char *out)
229 {
230 int i;
231
232 LTC_ARGCHK(md != NULL);
233 LTC_ARGCHK(out != NULL);
234
235 if (md->sha256.curlen >= sizeof(md->sha256.buf)) {
236 return CRYPT_INVALID_ARG;
237 }
238
239
240 /* increase the length of the message */
241 md->sha256.length += md->sha256.curlen * 8;
242
243 /* append the '1' bit */
244 md->sha256.buf[md->sha256.curlen++] = (unsigned char)0x80;
245
246 /* if the length is currently above 56 bytes we append zeros
247 * then compress. Then we can fall back to padding zeros and length
248 * encoding like normal.
249 */
250 if (md->sha256.curlen > 56) {
251 while (md->sha256.curlen < 64) {
252 md->sha256.buf[md->sha256.curlen++] = (unsigned char)0;
253 }
254 s_sha256_compress(md, md->sha256.buf);
255 md->sha256.curlen = 0;
256 }
257
258 /* pad upto 56 bytes of zeroes */
259 while (md->sha256.curlen < 56) {
260 md->sha256.buf[md->sha256.curlen++] = (unsigned char)0;
261 }
262
263 /* store length */
264 STORE64H(md->sha256.length, md->sha256.buf+56);
265 s_sha256_compress(md, md->sha256.buf);
266
267 /* copy output */
268 for (i = 0; i < 8; i++) {
269 STORE32H(md->sha256.state[i], out+(4*i));
270 }
271 #ifdef LTC_CLEAN_STACK
272 zeromem(md, sizeof(hash_state));
273 #endif
274 return CRYPT_OK;
275 }
276
277 /**
278 Self-test the hash
279 @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled
280 */
sha256_test(void)281 int sha256_test(void)
282 {
283 #ifndef LTC_TEST
284 return CRYPT_NOP;
285 #else
286 static const struct {
287 const char *msg;
288 unsigned char hash[32];
289 } tests[] = {
290 { "abc",
291 { 0xba, 0x78, 0x16, 0xbf, 0x8f, 0x01, 0xcf, 0xea,
292 0x41, 0x41, 0x40, 0xde, 0x5d, 0xae, 0x22, 0x23,
293 0xb0, 0x03, 0x61, 0xa3, 0x96, 0x17, 0x7a, 0x9c,
294 0xb4, 0x10, 0xff, 0x61, 0xf2, 0x00, 0x15, 0xad }
295 },
296 { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
297 { 0x24, 0x8d, 0x6a, 0x61, 0xd2, 0x06, 0x38, 0xb8,
298 0xe5, 0xc0, 0x26, 0x93, 0x0c, 0x3e, 0x60, 0x39,
299 0xa3, 0x3c, 0xe4, 0x59, 0x64, 0xff, 0x21, 0x67,
300 0xf6, 0xec, 0xed, 0xd4, 0x19, 0xdb, 0x06, 0xc1 }
301 },
302 };
303
304 int i;
305 unsigned char tmp[32];
306 hash_state md;
307
308 for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
309 sha256_init(&md);
310 sha256_process(&md, (unsigned char*)tests[i].msg, (unsigned long)XSTRLEN(tests[i].msg));
311 sha256_done(&md, tmp);
312 if (compare_testvector(tmp, sizeof(tmp), tests[i].hash, sizeof(tests[i].hash), "SHA256", i)) {
313 return CRYPT_FAIL_TESTVECTOR;
314 }
315 }
316 return CRYPT_OK;
317 #endif
318 }
319
320 #endif
321
322
323