1 /*
2  * HMAC-SHA-224/256/384/512 implementation
3  * Last update: 06/15/2005
4  * Issue date:  06/15/2005
5  *
6  * Since this code has been incorporated into a GPLv2 project, it is
7  * distributed under GPLv2 inside mmc-utils.  The original BSD license
8  * that the code was released under is included below for clarity.
9  *
10  * Copyright (C) 2005 Olivier Gay <olivier.gay@a3.epfl.ch>
11  * All rights reserved.
12  *
13  * Redistribution and use in source and binary forms, with or without
14  * modification, are permitted provided that the following conditions
15  * are met:
16  * 1. Redistributions of source code must retain the above copyright
17  *    notice, this list of conditions and the following disclaimer.
18  * 2. Redistributions in binary form must reproduce the above copyright
19  *    notice, this list of conditions and the following disclaimer in the
20  *    documentation and/or other materials provided with the distribution.
21  * 3. Neither the name of the project nor the names of its contributors
22  *    may be used to endorse or promote products derived from this software
23  *    without specific prior written permission.
24  *
25  * THIS SOFTWARE IS PROVIDED BY THE PROJECT AND CONTRIBUTORS ``AS IS'' AND
26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE PROJECT OR CONTRIBUTORS BE LIABLE
29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
35  * SUCH DAMAGE.
36  */
37 
38 #include <string.h>
39 
40 #include "hmac_sha2.h"
41 
42 /* HMAC-SHA-224 functions */
43 
hmac_sha224_init(hmac_sha224_ctx * ctx,const unsigned char * key,unsigned int key_size)44 void hmac_sha224_init(hmac_sha224_ctx *ctx, const unsigned char *key,
45                       unsigned int key_size)
46 {
47     unsigned int fill;
48     unsigned int num;
49 
50     const unsigned char *key_used;
51     unsigned char key_temp[SHA224_DIGEST_SIZE];
52     int i;
53 
54     if (key_size == SHA224_BLOCK_SIZE) {
55         key_used = key;
56         num = SHA224_BLOCK_SIZE;
57     } else {
58         if (key_size > SHA224_BLOCK_SIZE){
59             num = SHA224_DIGEST_SIZE;
60             sha224(key, key_size, key_temp);
61             key_used = key_temp;
62         } else { /* key_size > SHA224_BLOCK_SIZE */
63             key_used = key;
64             num = key_size;
65         }
66         fill = SHA224_BLOCK_SIZE - num;
67 
68         memset(ctx->block_ipad + num, 0x36, fill);
69         memset(ctx->block_opad + num, 0x5c, fill);
70     }
71 
72     for (i = 0; i < (int) num; i++) {
73         ctx->block_ipad[i] = key_used[i] ^ 0x36;
74         ctx->block_opad[i] = key_used[i] ^ 0x5c;
75     }
76 
77     sha224_init(&ctx->ctx_inside);
78     sha224_update(&ctx->ctx_inside, ctx->block_ipad, SHA224_BLOCK_SIZE);
79 
80     sha224_init(&ctx->ctx_outside);
81     sha224_update(&ctx->ctx_outside, ctx->block_opad,
82                   SHA224_BLOCK_SIZE);
83 
84     /* for hmac_reinit */
85     memcpy(&ctx->ctx_inside_reinit, &ctx->ctx_inside,
86            sizeof(sha224_ctx));
87     memcpy(&ctx->ctx_outside_reinit, &ctx->ctx_outside,
88            sizeof(sha224_ctx));
89 }
90 
hmac_sha224_reinit(hmac_sha224_ctx * ctx)91 void hmac_sha224_reinit(hmac_sha224_ctx *ctx)
92 {
93     memcpy(&ctx->ctx_inside, &ctx->ctx_inside_reinit,
94            sizeof(sha224_ctx));
95     memcpy(&ctx->ctx_outside, &ctx->ctx_outside_reinit,
96            sizeof(sha224_ctx));
97 }
98 
hmac_sha224_update(hmac_sha224_ctx * ctx,const unsigned char * message,unsigned int message_len)99 void hmac_sha224_update(hmac_sha224_ctx *ctx, const unsigned char *message,
100                         unsigned int message_len)
101 {
102     sha224_update(&ctx->ctx_inside, message, message_len);
103 }
104 
hmac_sha224_final(hmac_sha224_ctx * ctx,unsigned char * mac,unsigned int mac_size)105 void hmac_sha224_final(hmac_sha224_ctx *ctx, unsigned char *mac,
106                        unsigned int mac_size)
107 {
108     unsigned char digest_inside[SHA224_DIGEST_SIZE];
109     unsigned char mac_temp[SHA224_DIGEST_SIZE];
110 
111     sha224_final(&ctx->ctx_inside, digest_inside);
112     sha224_update(&ctx->ctx_outside, digest_inside, SHA224_DIGEST_SIZE);
113     sha224_final(&ctx->ctx_outside, mac_temp);
114     memcpy(mac, mac_temp, mac_size);
115 }
116 
hmac_sha224(const unsigned char * key,unsigned int key_size,const unsigned char * message,unsigned int message_len,unsigned char * mac,unsigned mac_size)117 void hmac_sha224(const unsigned char *key, unsigned int key_size,
118           const unsigned char *message, unsigned int message_len,
119           unsigned char *mac, unsigned mac_size)
120 {
121     hmac_sha224_ctx ctx;
122 
123     hmac_sha224_init(&ctx, key, key_size);
124     hmac_sha224_update(&ctx, message, message_len);
125     hmac_sha224_final(&ctx, mac, mac_size);
126 }
127 
128 /* HMAC-SHA-256 functions */
129 
hmac_sha256_init(hmac_sha256_ctx * ctx,const unsigned char * key,unsigned int key_size)130 void hmac_sha256_init(hmac_sha256_ctx *ctx, const unsigned char *key,
131                       unsigned int key_size)
132 {
133     unsigned int fill;
134     unsigned int num;
135 
136     const unsigned char *key_used;
137     unsigned char key_temp[SHA256_DIGEST_SIZE];
138     int i;
139 
140     if (key_size == SHA256_BLOCK_SIZE) {
141         key_used = key;
142         num = SHA256_BLOCK_SIZE;
143     } else {
144         if (key_size > SHA256_BLOCK_SIZE){
145             num = SHA256_DIGEST_SIZE;
146             sha256(key, key_size, key_temp);
147             key_used = key_temp;
148         } else { /* key_size > SHA256_BLOCK_SIZE */
149             key_used = key;
150             num = key_size;
151         }
152         fill = SHA256_BLOCK_SIZE - num;
153 
154         memset(ctx->block_ipad + num, 0x36, fill);
155         memset(ctx->block_opad + num, 0x5c, fill);
156     }
157 
158     for (i = 0; i < (int) num; i++) {
159         ctx->block_ipad[i] = key_used[i] ^ 0x36;
160         ctx->block_opad[i] = key_used[i] ^ 0x5c;
161     }
162 
163     sha256_init(&ctx->ctx_inside);
164     sha256_update(&ctx->ctx_inside, ctx->block_ipad, SHA256_BLOCK_SIZE);
165 
166     sha256_init(&ctx->ctx_outside);
167     sha256_update(&ctx->ctx_outside, ctx->block_opad,
168                   SHA256_BLOCK_SIZE);
169 
170     /* for hmac_reinit */
171     memcpy(&ctx->ctx_inside_reinit, &ctx->ctx_inside,
172            sizeof(sha256_ctx));
173     memcpy(&ctx->ctx_outside_reinit, &ctx->ctx_outside,
174            sizeof(sha256_ctx));
175 }
176 
hmac_sha256_reinit(hmac_sha256_ctx * ctx)177 void hmac_sha256_reinit(hmac_sha256_ctx *ctx)
178 {
179     memcpy(&ctx->ctx_inside, &ctx->ctx_inside_reinit,
180            sizeof(sha256_ctx));
181     memcpy(&ctx->ctx_outside, &ctx->ctx_outside_reinit,
182            sizeof(sha256_ctx));
183 }
184 
hmac_sha256_update(hmac_sha256_ctx * ctx,const unsigned char * message,unsigned int message_len)185 void hmac_sha256_update(hmac_sha256_ctx *ctx, const unsigned char *message,
186                         unsigned int message_len)
187 {
188     sha256_update(&ctx->ctx_inside, message, message_len);
189 }
190 
hmac_sha256_final(hmac_sha256_ctx * ctx,unsigned char * mac,unsigned int mac_size)191 void hmac_sha256_final(hmac_sha256_ctx *ctx, unsigned char *mac,
192                        unsigned int mac_size)
193 {
194     unsigned char digest_inside[SHA256_DIGEST_SIZE];
195     unsigned char mac_temp[SHA256_DIGEST_SIZE];
196 
197     sha256_final(&ctx->ctx_inside, digest_inside);
198     sha256_update(&ctx->ctx_outside, digest_inside, SHA256_DIGEST_SIZE);
199     sha256_final(&ctx->ctx_outside, mac_temp);
200     memcpy(mac, mac_temp, mac_size);
201 }
202 
hmac_sha256(const unsigned char * key,unsigned int key_size,const unsigned char * message,unsigned int message_len,unsigned char * mac,unsigned mac_size)203 void hmac_sha256(const unsigned char *key, unsigned int key_size,
204           const unsigned char *message, unsigned int message_len,
205           unsigned char *mac, unsigned mac_size)
206 {
207     hmac_sha256_ctx ctx;
208 
209     hmac_sha256_init(&ctx, key, key_size);
210     hmac_sha256_update(&ctx, message, message_len);
211     hmac_sha256_final(&ctx, mac, mac_size);
212 }
213 
214 /* HMAC-SHA-384 functions */
215 
hmac_sha384_init(hmac_sha384_ctx * ctx,const unsigned char * key,unsigned int key_size)216 void hmac_sha384_init(hmac_sha384_ctx *ctx, const unsigned char *key,
217                       unsigned int key_size)
218 {
219     unsigned int fill;
220     unsigned int num;
221 
222     const unsigned char *key_used;
223     unsigned char key_temp[SHA384_DIGEST_SIZE];
224     int i;
225 
226     if (key_size == SHA384_BLOCK_SIZE) {
227         key_used = key;
228         num = SHA384_BLOCK_SIZE;
229     } else {
230         if (key_size > SHA384_BLOCK_SIZE){
231             num = SHA384_DIGEST_SIZE;
232             sha384(key, key_size, key_temp);
233             key_used = key_temp;
234         } else { /* key_size > SHA384_BLOCK_SIZE */
235             key_used = key;
236             num = key_size;
237         }
238         fill = SHA384_BLOCK_SIZE - num;
239 
240         memset(ctx->block_ipad + num, 0x36, fill);
241         memset(ctx->block_opad + num, 0x5c, fill);
242     }
243 
244     for (i = 0; i < (int) num; i++) {
245         ctx->block_ipad[i] = key_used[i] ^ 0x36;
246         ctx->block_opad[i] = key_used[i] ^ 0x5c;
247     }
248 
249     sha384_init(&ctx->ctx_inside);
250     sha384_update(&ctx->ctx_inside, ctx->block_ipad, SHA384_BLOCK_SIZE);
251 
252     sha384_init(&ctx->ctx_outside);
253     sha384_update(&ctx->ctx_outside, ctx->block_opad,
254                   SHA384_BLOCK_SIZE);
255 
256     /* for hmac_reinit */
257     memcpy(&ctx->ctx_inside_reinit, &ctx->ctx_inside,
258            sizeof(sha384_ctx));
259     memcpy(&ctx->ctx_outside_reinit, &ctx->ctx_outside,
260            sizeof(sha384_ctx));
261 }
262 
hmac_sha384_reinit(hmac_sha384_ctx * ctx)263 void hmac_sha384_reinit(hmac_sha384_ctx *ctx)
264 {
265     memcpy(&ctx->ctx_inside, &ctx->ctx_inside_reinit,
266            sizeof(sha384_ctx));
267     memcpy(&ctx->ctx_outside, &ctx->ctx_outside_reinit,
268            sizeof(sha384_ctx));
269 }
270 
hmac_sha384_update(hmac_sha384_ctx * ctx,const unsigned char * message,unsigned int message_len)271 void hmac_sha384_update(hmac_sha384_ctx *ctx, const unsigned char *message,
272                         unsigned int message_len)
273 {
274     sha384_update(&ctx->ctx_inside, message, message_len);
275 }
276 
hmac_sha384_final(hmac_sha384_ctx * ctx,unsigned char * mac,unsigned int mac_size)277 void hmac_sha384_final(hmac_sha384_ctx *ctx, unsigned char *mac,
278                        unsigned int mac_size)
279 {
280     unsigned char digest_inside[SHA384_DIGEST_SIZE];
281     unsigned char mac_temp[SHA384_DIGEST_SIZE];
282 
283     sha384_final(&ctx->ctx_inside, digest_inside);
284     sha384_update(&ctx->ctx_outside, digest_inside, SHA384_DIGEST_SIZE);
285     sha384_final(&ctx->ctx_outside, mac_temp);
286     memcpy(mac, mac_temp, mac_size);
287 }
288 
hmac_sha384(const unsigned char * key,unsigned int key_size,const unsigned char * message,unsigned int message_len,unsigned char * mac,unsigned mac_size)289 void hmac_sha384(const unsigned char *key, unsigned int key_size,
290           const unsigned char *message, unsigned int message_len,
291           unsigned char *mac, unsigned mac_size)
292 {
293     hmac_sha384_ctx ctx;
294 
295     hmac_sha384_init(&ctx, key, key_size);
296     hmac_sha384_update(&ctx, message, message_len);
297     hmac_sha384_final(&ctx, mac, mac_size);
298 }
299 
300 /* HMAC-SHA-512 functions */
301 
hmac_sha512_init(hmac_sha512_ctx * ctx,const unsigned char * key,unsigned int key_size)302 void hmac_sha512_init(hmac_sha512_ctx *ctx, const unsigned char *key,
303                       unsigned int key_size)
304 {
305     unsigned int fill;
306     unsigned int num;
307 
308     const unsigned char *key_used;
309     unsigned char key_temp[SHA512_DIGEST_SIZE];
310     int i;
311 
312     if (key_size == SHA512_BLOCK_SIZE) {
313         key_used = key;
314         num = SHA512_BLOCK_SIZE;
315     } else {
316         if (key_size > SHA512_BLOCK_SIZE){
317             num = SHA512_DIGEST_SIZE;
318             sha512(key, key_size, key_temp);
319             key_used = key_temp;
320         } else { /* key_size > SHA512_BLOCK_SIZE */
321             key_used = key;
322             num = key_size;
323         }
324         fill = SHA512_BLOCK_SIZE - num;
325 
326         memset(ctx->block_ipad + num, 0x36, fill);
327         memset(ctx->block_opad + num, 0x5c, fill);
328     }
329 
330     for (i = 0; i < (int) num; i++) {
331         ctx->block_ipad[i] = key_used[i] ^ 0x36;
332         ctx->block_opad[i] = key_used[i] ^ 0x5c;
333     }
334 
335     sha512_init(&ctx->ctx_inside);
336     sha512_update(&ctx->ctx_inside, ctx->block_ipad, SHA512_BLOCK_SIZE);
337 
338     sha512_init(&ctx->ctx_outside);
339     sha512_update(&ctx->ctx_outside, ctx->block_opad,
340                   SHA512_BLOCK_SIZE);
341 
342     /* for hmac_reinit */
343     memcpy(&ctx->ctx_inside_reinit, &ctx->ctx_inside,
344            sizeof(sha512_ctx));
345     memcpy(&ctx->ctx_outside_reinit, &ctx->ctx_outside,
346            sizeof(sha512_ctx));
347 }
348 
hmac_sha512_reinit(hmac_sha512_ctx * ctx)349 void hmac_sha512_reinit(hmac_sha512_ctx *ctx)
350 {
351     memcpy(&ctx->ctx_inside, &ctx->ctx_inside_reinit,
352            sizeof(sha512_ctx));
353     memcpy(&ctx->ctx_outside, &ctx->ctx_outside_reinit,
354            sizeof(sha512_ctx));
355 }
356 
hmac_sha512_update(hmac_sha512_ctx * ctx,const unsigned char * message,unsigned int message_len)357 void hmac_sha512_update(hmac_sha512_ctx *ctx, const unsigned char *message,
358                         unsigned int message_len)
359 {
360     sha512_update(&ctx->ctx_inside, message, message_len);
361 }
362 
hmac_sha512_final(hmac_sha512_ctx * ctx,unsigned char * mac,unsigned int mac_size)363 void hmac_sha512_final(hmac_sha512_ctx *ctx, unsigned char *mac,
364                        unsigned int mac_size)
365 {
366     unsigned char digest_inside[SHA512_DIGEST_SIZE];
367     unsigned char mac_temp[SHA512_DIGEST_SIZE];
368 
369     sha512_final(&ctx->ctx_inside, digest_inside);
370     sha512_update(&ctx->ctx_outside, digest_inside, SHA512_DIGEST_SIZE);
371     sha512_final(&ctx->ctx_outside, mac_temp);
372     memcpy(mac, mac_temp, mac_size);
373 }
374 
hmac_sha512(const unsigned char * key,unsigned int key_size,const unsigned char * message,unsigned int message_len,unsigned char * mac,unsigned mac_size)375 void hmac_sha512(const unsigned char *key, unsigned int key_size,
376           const unsigned char *message, unsigned int message_len,
377           unsigned char *mac, unsigned mac_size)
378 {
379     hmac_sha512_ctx ctx;
380 
381     hmac_sha512_init(&ctx, key, key_size);
382     hmac_sha512_update(&ctx, message, message_len);
383     hmac_sha512_final(&ctx, mac, mac_size);
384 }
385 
386 #ifdef TEST_VECTORS
387 
388 /* IETF Validation tests */
389 
390 #include <stdio.h>
391 #include <stdlib.h>
392 
test(const char * vector,unsigned char * digest,unsigned int digest_size)393 void test(const char *vector, unsigned char *digest,
394           unsigned int digest_size)
395 {
396     char output[2 * SHA512_DIGEST_SIZE + 1];
397     int i;
398 
399     output[2 * digest_size] = '\0';
400 
401     for (i = 0; i < (int) digest_size ; i++) {
402        sprintf(output + 2*i, "%02x", digest[i]);
403     }
404 
405     printf("H: %s\n", output);
406     if (strcmp(vector, output)) {
407         fprintf(stderr, "Test failed.\n");
408         exit(1);
409     }
410 }
411 
main(void)412 int main(void)
413 {
414     static const char *vectors[] =
415     {
416         /* HMAC-SHA-224 */
417         "896fb1128abbdf196832107cd49df33f47b4b1169912ba4f53684b22",
418         "a30e01098bc6dbbf45690f3a7e9e6d0f8bbea2a39e6148008fd05e44",
419         "7fb3cb3588c6c1f6ffa9694d7d6ad2649365b0c1f65d69d1ec8333ea",
420         "6c11506874013cac6a2abc1bb382627cec6a90d86efc012de7afec5a",
421         "0e2aea68a90c8d37c988bcdb9fca6fa8",
422         "95e9a0db962095adaebe9b2d6f0dbce2d499f112f2d2b7273fa6870e",
423         "3a854166ac5d9f023f54d517d0b39dbd946770db9c2b95c9f6f565d1",
424         /* HMAC-SHA-256 */
425         "b0344c61d8db38535ca8afceaf0bf12b881dc200c9833da726e9376c2e32cff7",
426         "5bdcc146bf60754e6a042426089575c75a003f089d2739839dec58b964ec3843",
427         "773ea91e36800e46854db8ebd09181a72959098b3ef8c122d9635514ced565fe",
428         "82558a389a443c0ea4cc819899f2083a85f0faa3e578f8077a2e3ff46729665b",
429         "a3b6167473100ee06e0c796c2955552b",
430         "60e431591ee0b67f0d8a26aacbf5b77f8e0bc6213728c5140546040f0ee37f54",
431         "9b09ffa71b942fcb27635fbcd5b0e944bfdc63644f0713938a7f51535c3a35e2",
432         /* HMAC-SHA-384 */
433         "afd03944d84895626b0825f4ab46907f15f9dadbe4101ec682aa034c7cebc59c"
434         "faea9ea9076ede7f4af152e8b2fa9cb6",
435         "af45d2e376484031617f78d2b58a6b1b9c7ef464f5a01b47e42ec3736322445e"
436         "8e2240ca5e69e2c78b3239ecfab21649",
437         "88062608d3e6ad8a0aa2ace014c8a86f0aa635d947ac9febe83ef4e55966144b"
438         "2a5ab39dc13814b94e3ab6e101a34f27",
439         "3e8a69b7783c25851933ab6290af6ca77a9981480850009cc5577c6e1f573b4e"
440         "6801dd23c4a7d679ccf8a386c674cffb",
441         "3abf34c3503b2a23a46efc619baef897",
442         "4ece084485813e9088d2c63a041bc5b44f9ef1012a2b588f3cd11f05033ac4c6"
443         "0c2ef6ab4030fe8296248df163f44952",
444         "6617178e941f020d351e2f254e8fd32c602420feb0b8fb9adccebb82461e99c5"
445         "a678cc31e799176d3860e6110c46523e",
446         /* HMAC-SHA-512 */
447         "87aa7cdea5ef619d4ff0b4241a1d6cb02379f4e2ce4ec2787ad0b30545e17cde"
448         "daa833b7d6b8a702038b274eaea3f4e4be9d914eeb61f1702e696c203a126854",
449         "164b7a7bfcf819e2e395fbe73b56e0a387bd64222e831fd610270cd7ea250554"
450         "9758bf75c05a994a6d034f65f8f0e6fdcaeab1a34d4a6b4b636e070a38bce737",
451         "fa73b0089d56a284efb0f0756c890be9b1b5dbdd8ee81a3655f83e33b2279d39"
452         "bf3e848279a722c806b485a47e67c807b946a337bee8942674278859e13292fb",
453         "b0ba465637458c6990e5a8c5f61d4af7e576d97ff94b872de76f8050361ee3db"
454         "a91ca5c11aa25eb4d679275cc5788063a5f19741120c4f2de2adebeb10a298dd",
455         "415fad6271580a531d4179bc891d87a6",
456         "80b24263c7c1a3ebb71493c1dd7be8b49b46d1f41b4aeec1121b013783f8f352"
457         "6b56d037e05f2598bd0fd2215d6a1e5295e64f73f63f0aec8b915a985d786598",
458         "e37b6a775dc87dbaa4dfa9f96e5e3ffddebd71f8867289865df5a32d20cdc944"
459         "b6022cac3c4982b10d5eeb55c3e4de15134676fb6de0446065c97440fa8c6a58"
460     };
461 
462     static char *messages[] =
463     {
464         "Hi There",
465         "what do ya want for nothing?",
466         NULL,
467         NULL,
468         "Test With Truncation",
469         "Test Using Larger Than Block-Size Key - Hash Key First",
470         "This is a test using a larger than block-size key "
471         "and a larger than block-size data. The key needs"
472         " to be hashed before being used by the HMAC algorithm."
473     };
474 
475     unsigned char mac[SHA512_DIGEST_SIZE];
476     unsigned char *keys[7];
477     unsigned int keys_len[7] = {20, 4, 20, 25, 20, 131, 131};
478     unsigned int messages2and3_len = 50;
479     unsigned int mac_224_size, mac_256_size, mac_384_size, mac_512_size;
480     int i;
481 
482     for (i = 0; i < 7; i++) {
483         keys[i] = malloc(keys_len[i]);
484         if (keys[i] == NULL) {
485             fprintf(stderr, "Can't allocate memory\n");
486             return 1;
487         }
488     }
489 
490     memset(keys[0], 0x0b, keys_len[0]);
491     strcpy((char *) keys[1], "Jefe");
492     memset(keys[2], 0xaa, keys_len[2]);
493     for (i = 0; i < (int) keys_len[3]; i++)
494         keys[3][i] = (unsigned char) i + 1;
495     memset(keys[4], 0x0c, keys_len[4]);
496     memset(keys[5], 0xaa, keys_len[5]);
497     memset(keys[6], 0xaa, keys_len[6]);
498 
499     messages[2] = malloc(messages2and3_len + 1);
500     messages[3] = malloc(messages2and3_len + 1);
501 
502     if (messages[2] == NULL || messages[3] == NULL) {
503         fprintf(stderr, "Can't allocate memory\n");
504         return 1;
505     }
506 
507     messages[2][messages2and3_len] = '\0';
508     messages[3][messages2and3_len] = '\0';
509 
510     memset(messages[2], 0xdd, messages2and3_len);
511     memset(messages[3], 0xcd, messages2and3_len);
512 
513     printf("HMAC-SHA-2 IETF Validation tests\n\n");
514 
515     for (i = 0; i < 7; i++) {
516         if (i != 4) {
517             mac_224_size = SHA224_DIGEST_SIZE;
518             mac_256_size = SHA256_DIGEST_SIZE;
519             mac_384_size = SHA384_DIGEST_SIZE;
520             mac_512_size = SHA512_DIGEST_SIZE;
521         } else {
522             mac_224_size = 128 / 8; mac_256_size = 128 / 8;
523             mac_384_size = 128 / 8; mac_512_size = 128 / 8;
524         }
525 
526         printf("Test %d:\n", i + 1);
527 
528         hmac_sha224(keys[i], keys_len[i], (unsigned char *) messages[i],
529                     strlen(messages[i]), mac, mac_224_size);
530         test(vectors[i], mac, mac_224_size);
531         hmac_sha256(keys[i], keys_len[i], (unsigned char *) messages[i],
532                     strlen(messages[i]), mac, mac_256_size);
533         test(vectors[7 + i], mac, mac_256_size);
534         hmac_sha384(keys[i], keys_len[i], (unsigned char *) messages[i],
535                     strlen(messages[i]), mac, mac_384_size);
536         test(vectors[14 + i], mac, mac_384_size);
537         hmac_sha512(keys[i], keys_len[i], (unsigned char *) messages[i],
538                     strlen(messages[i]), mac, mac_512_size);
539         test(vectors[21 + i], mac, mac_512_size);
540     }
541 
542     printf("All tests passed.\n");
543 
544     return 0;
545 }
546 
547 #endif /* TEST_VECTORS */
548 
549