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/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
*/
/**
@param sha224.c
SHA-224 new NIST standard based off of SHA-256 truncated to 224 bits (Tom St Denis)
*/
const struct ltc_hash_descriptor sha224_desc =
{
"sha224",
10,
28,
64,
/* OID */
{ 2, 16, 840, 1, 101, 3, 4, 2, 4, },
9,
&sha224_init,
&sha256_process,
&sha224_done,
&sha224_test
};
/* init the sha256 er... sha224 state ;-) */
/**
Initialize the hash state
@param md The hash state you wish to initialize
@return CRYPT_OK if successful
*/
int sha224_init(hash_state * md)
{
LTC_ARGCHK(md != NULL);
md->sha256.curlen = 0;
md->sha256.length = 0;
md->sha256.state[0] = 0xc1059ed8UL;
md->sha256.state[1] = 0x367cd507UL;
md->sha256.state[2] = 0x3070dd17UL;
md->sha256.state[3] = 0xf70e5939UL;
md->sha256.state[4] = 0xffc00b31UL;
md->sha256.state[5] = 0x68581511UL;
md->sha256.state[6] = 0x64f98fa7UL;
md->sha256.state[7] = 0xbefa4fa4UL;
return CRYPT_OK;
}
/**
Terminate the hash to get the digest
@param md The hash state
@param out [out] The destination of the hash (28 bytes)
@return CRYPT_OK if successful
*/
int sha224_done(hash_state * md, unsigned char *out)
{
unsigned char buf[32];
int err;
LTC_ARGCHK(md != NULL);
LTC_ARGCHK(out != NULL);
err = sha256_done(md, buf);
XMEMCPY(out, buf, 28);
#ifdef LTC_CLEAN_STACK
zeromem(buf, sizeof(buf));
#endif
return err;
}
/**
Self-test the hash
@return CRYPT_OK if successful, CRYPT_NOP if self-tests have been disabled
*/
int sha224_test(void)
{
#ifndef LTC_TEST
return CRYPT_NOP;
#else
static const struct {
char *msg;
unsigned char hash[28];
} tests[] = {
{ "abc",
{ 0x23, 0x09, 0x7d, 0x22, 0x34, 0x05, 0xd8,
0x22, 0x86, 0x42, 0xa4, 0x77, 0xbd, 0xa2,
0x55, 0xb3, 0x2a, 0xad, 0xbc, 0xe4, 0xbd,
0xa0, 0xb3, 0xf7, 0xe3, 0x6c, 0x9d, 0xa7 }
},
{ "abcdbcdecdefdefgefghfghighijhijkijkljklmklmnlmnomnopnopq",
{ 0x75, 0x38, 0x8b, 0x16, 0x51, 0x27, 0x76,
0xcc, 0x5d, 0xba, 0x5d, 0xa1, 0xfd, 0x89,
0x01, 0x50, 0xb0, 0xc6, 0x45, 0x5c, 0xb4,
0xf5, 0x8b, 0x19, 0x52, 0x52, 0x25, 0x25 }
},
};
int i;
unsigned char tmp[28];
hash_state md;
for (i = 0; i < (int)(sizeof(tests) / sizeof(tests[0])); i++) {
sha224_init(&md);
sha224_process(&md, (unsigned char*)tests[i].msg, (unsigned long)strlen(tests[i].msg));
sha224_done(&md, tmp);
if (memcmp(tmp, tests[i].hash, 28) != 0) {
return CRYPT_FAIL_TESTVECTOR;
}
}
return CRYPT_OK;
#endif
}
/* $Source: /cvs/libtom/libtomcrypt/src/hashes/sha2/sha224.c,v $ */
/* $Revision: 1.5 $ */
/* $Date: 2005/05/23 02:42:07 $ */
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