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@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
16const 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*/
40int 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*/
63int 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*/
83int  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