annotate hmac_file.c @ 143:5d99163f7e32 libtomcrypt-orig

import of libtomcrypt 0.99
author Matt Johnston <matt@ucc.asn.au>
date Sun, 19 Dec 2004 11:34:45 +0000
parents 7faae8f46238
children
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
3
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
1 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
2 *
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
3 * LibTomCrypt is a library that provides various cryptographic
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
4 * algorithms in a highly modular and flexible manner.
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
5 *
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
6 * The library is free for all purposes without any express
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
7 * guarantee it works.
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
8 *
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
9 * Tom St Denis, [email protected], http://libtomcrypt.org
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
10 */
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
11 /* Submited by Dobes Vandermeer ([email protected]) */
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
12
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
13 #include "mycrypt.h"
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
14
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
15 #ifdef HMAC
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
16
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
17 /* hmac_file added by Tom St Denis */
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
18 int hmac_file(int hash, const char *fname,
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
19 const unsigned char *key, unsigned long keylen,
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
20 unsigned char *dst, unsigned long *dstlen)
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
21 {
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
22 #ifdef NO_FILE
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
23 return CRYPT_NOP;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
24 #else
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
25 hmac_state hmac;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
26 FILE *in;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
27 unsigned char buf[512];
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
28 size_t x;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
29 int err;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
30
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
31 _ARGCHK(fname != NULL);
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
32 _ARGCHK(key != NULL);
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
33 _ARGCHK(dst != NULL);
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
34 _ARGCHK(dstlen != NULL);
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
35
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
36 if((err = hash_is_valid(hash)) != CRYPT_OK) {
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
37 return err;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
38 }
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
39
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
40 if ((err = hmac_init(&hmac, hash, key, keylen)) != CRYPT_OK) {
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
41 return err;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
42 }
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
43
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
44 in = fopen(fname, "rb");
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
45 if (in == NULL) {
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
46 return CRYPT_FILE_NOTFOUND;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
47 }
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
48
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
49 /* process the file contents */
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
50 do {
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
51 x = fread(buf, 1, sizeof(buf), in);
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
52 if ((err = hmac_process(&hmac, buf, (unsigned long)x)) != CRYPT_OK) {
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
53 /* we don't trap this error since we're already returning an error! */
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
54 fclose(in);
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
55 return err;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
56 }
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
57 } while (x == sizeof(buf));
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
58
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
59 if (fclose(in) != 0) {
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
60 return CRYPT_ERROR;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
61 }
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
62
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
63 /* get final hmac */
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
64 if ((err = hmac_done(&hmac, dst, dstlen)) != CRYPT_OK) {
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
65 return err;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
66 }
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
67
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
68 #ifdef CLEAN_STACK
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
69 /* clear memory */
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
70 zeromem(buf, sizeof(buf));
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
71 #endif
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
72 return CRYPT_OK;
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
73 #endif
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
74 }
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
75
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
76 #endif
7faae8f46238 Branch renaming
Matt Johnston <matt@ucc.asn.au>
parents:
diff changeset
77