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      1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
      2  *
      3  * LibTomCrypt is a library that provides various cryptographic
      4  * algorithms in a highly modular and flexible manner.
      5  *
      6  * The library is free for all purposes without any express
      7  * guarantee it works.
      8  *
      9  * Tom St Denis, tomstdenis (at) gmail.com, http://libtomcrypt.com
     10  */
     11 /**
     12    @param sha224.c
     13    SHA-224 new NIST standard based off of SHA-256 truncated to 224 bits (Tom St Denis)
     14 */
     15 
     16 const struct ltc_hash_descriptor sha224_desc =
     17 {
     18     "sha224",
     19     10,
     20     28,
     21     64,
     22 
     23     /* OID */
     24    { 2, 16, 840, 1, 101, 3, 4, 2, 4,  },
     25    9,
     26 
     27     &sha224_init,
     28     &sha256_process,
     29     &sha224_done,
     30     &sha224_test,
     31     NULL
     32 };
     33 
     34 /* init the sha256 er... sha224 state ;-) */
     35 /**
     36    Initialize the hash state
     37    @param md   The hash state you wish to initialize
     38    @return CRYPT_OK if successful
     39 */
     40 int sha224_init(hash_state * md)
     41 {
     42     LTC_ARGCHK(md != NULL);
     43 
     44     md->sha256.curlen = 0;
     45     md->sha256.length = 0;
     46     md->sha256.state[0] = 0xc1059ed8UL;
     47     md->sha256.state[1] = 0x367cd507UL;
     48     md->sha256.state[2] = 0x3070dd17UL;
     49     md->sha256.state[3] = 0xf70e5939UL;
     50     md->sha256.state[4] = 0xffc00b31UL;
     51     md->sha256.state[5] = 0x68581511UL;
     52     md->sha256.state[6] = 0x64f98fa7UL;
     53     md->sha256.state[7] = 0xbefa4fa4UL;
     54     return CRYPT_OK;
     55 }
     56 
     57 /**
     58    Terminate the hash to get the digest
     59    @param md  The hash state
     60    @param out [out] The destination of the hash (28 bytes)
     61    @return CRYPT_OK if successful
     62 */
     63 int sha224_done(hash_state * md, unsigned char *out)
     64 {
     65     unsigned char buf[32];
     66     int err;
     67 
     68     LTC_ARGCHK(md  != NULL);
     69     LTC_ARGCHK(out != NULL);
     70 
     71     err = sha256_done(md, buf);
     72     XMEMCPY(out, buf, 28);
     73 #ifdef LTC_CLEAN_STACK
     74     zeromem(buf, sizeof(buf));
     75 #endif
     76     return err;
     77 }
     78 
     79 /**
     80   Self-test the hash
     81   @return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled
     82 */
     83 int  sha224_test(void)
     84 {
     85  #ifndef LTC_TEST
     86     return CRYPT_NOP;
     87  #else
     88   static const struct {
     89       char *msg;
     90       unsigned char hash[28];
     91   } tests[] = {
     92     { "abc",
     93       { 0x23, 0x09, 0x7d, 0x22, 0x34, 0x05, 0xd8,
     94         0x22, 0x86, 0x42, 0xa4, 0x77, 0xbd, 0xa2,
     95         0x55, 0xb3, 0x2a, 0xad, 0xbc, 0xe4, 0xbd,
     96         0xa0, 0xb3, 0xf7, 0xe3, 0x6c, 0x9d, 0xa7 }
     97     },
     98     { "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
     99       { 0x75, 0x38, 0x8b, 0x16, 0x51, 0x27, 0x76,
    100         0xcc, 0x5d, 0xba, 0x5d, 0xa1, 0xfd, 0x89,
    101         0x01, 0x50, 0xb0, 0xc6, 0x45, 0x5c, 0xb4,
    102         0xf5, 0x8b, 0x19, 0x52, 0x52, 0x25, 0x25 }
    103     },
    104   };
    105 
    106   int i;
    107   unsigned char tmp[28];
    108   hash_state md;
    109 
    110   for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
    111       sha224_init(&md);
    112       sha224_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg));
    113       sha224_done(&md, tmp);
    114       if (XMEMCMP(tmp, tests[i].hash, 28) != 0) {
    115          return CRYPT_FAIL_TESTVECTOR;
    116       }
    117   }
    118   return CRYPT_OK;
    119  #endif
    120 }
    121 
    122 
    123 /* $Source: /cvs/libtom/libtomcrypt/src/hashes/sha2/sha224.c,v $ */
    124 /* $Revision: 1.8 $ */
    125 /* $Date: 2006/11/01 09:28:17 $ */
    126