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comparison libtomcrypt/src/mac/omac/omac_memory.c @ 285:1b9e69c058d2

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propagate from branch 'au.asn.ucc.matt.ltc.dropbear' (head 20dccfc09627970a312d77fb41dc2970b62689c3) to branch 'au.asn.ucc.matt.dropbear' (head fdf4a7a3b97ae5046139915de7e40399cceb2c01)
author Matt Johnston <matt@ucc.asn.au>
date Wed, 08 Mar 2006 13:23:58 +0000
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children 0cbe8f6dbf9e
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281:997e6f7dc01e 285:1b9e69c058d2
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, [email protected], http://libtomcrypt.org
10 */
11 #include "tomcrypt.h"
12
13 /**
14 @file omac_memory.c
15 OMAC1 support, process a block of memory, Tom St Denis
16 */
17
18 #ifdef OMAC
19
20 /**
21 OMAC a block of memory
22 @param cipher The index of the desired cipher
23 @param key The secret key
24 @param keylen The length of the secret key (octets)
25 @param in The data to send through OMAC
26 @param inlen The length of the data to send through OMAC (octets)
27 @param out [out] The destination of the authentication tag
28 @param outlen [in/out] The max size and resulting size of the authentication tag (octets)
29 @return CRYPT_OK if successful
30 */
31 int omac_memory(int cipher,
32 const unsigned char *key, unsigned long keylen,
33 const unsigned char *in, unsigned long inlen,
34 unsigned char *out, unsigned long *outlen)
35 {
36 int err;
37 omac_state *omac;
38
39 LTC_ARGCHK(key != NULL);
40 LTC_ARGCHK(in != NULL);
41 LTC_ARGCHK(out != NULL);
42 LTC_ARGCHK(outlen != NULL);
43
44 /* allocate ram for omac state */
45 omac = XMALLOC(sizeof(omac_state));
46 if (omac == NULL) {
47 return CRYPT_MEM;
48 }
49
50 /* omac process the message */
51 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
52 goto LBL_ERR;
53 }
54 if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) {
55 goto LBL_ERR;
56 }
57 if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
58 goto LBL_ERR;
59 }
60
61 err = CRYPT_OK;
62 LBL_ERR:
63 #ifdef LTC_CLEAN_STACK
64 zeromem(omac, sizeof(omac_state));
65 #endif
66
67 XFREE(omac);
68 return err;
69 }
70
71 #endif
72
73 /* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_memory.c,v $ */
74 /* $Revision: 1.3 $ */
75 /* $Date: 2005/05/05 14:35:58 $ */