Home | History | Annotate | Download | only in hmac_sha 
      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 (at) 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 
     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 
     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 
     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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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 
    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