1 // SPDX-License-Identifier: BSD-2-Clause
2 /* LibTomCrypt, modular cryptographic library -- Tom St Denis
3 *
4 * LibTomCrypt is a library that provides various cryptographic
5 * algorithms in a highly modular and flexible manner.
6 *
7 * The library is free for all purposes without any express
8 * guarantee it works.
9 */
10 #include "tomcrypt_private.h"
11
12 /**
13 @file omac_memory.c
14 OMAC1 support, process a block of memory, Tom St Denis
15 */
16
17 #ifdef LTC_OMAC
18
19 /**
20 OMAC a block of memory
21 @param cipher The index of the desired cipher
22 @param key The secret key
23 @param keylen The length of the secret key (octets)
24 @param in The data to send through OMAC
25 @param inlen The length of the data to send through OMAC (octets)
26 @param out [out] The destination of the authentication tag
27 @param outlen [in/out] The max size and resulting size of the authentication tag (octets)
28 @return CRYPT_OK if successful
29 */
omac_memory(int cipher,const unsigned char * key,unsigned long keylen,const unsigned char * in,unsigned long inlen,unsigned char * out,unsigned long * outlen)30 int omac_memory(int cipher,
31 const unsigned char *key, unsigned long keylen,
32 const unsigned char *in, unsigned long inlen,
33 unsigned char *out, unsigned long *outlen)
34 {
35 int err;
36 omac_state *omac;
37
38 LTC_ARGCHK(key != NULL);
39 LTC_ARGCHK(in != NULL);
40 LTC_ARGCHK(out != NULL);
41 LTC_ARGCHK(outlen != NULL);
42
43 /* is the cipher valid? */
44 if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
45 return err;
46 }
47
48 /* Use accelerator if found */
49 if (cipher_descriptor[cipher]->omac_memory != NULL) {
50 return cipher_descriptor[cipher]->omac_memory(key, keylen, in, inlen, out, outlen);
51 }
52
53 /* allocate ram for omac state */
54 omac = XMALLOC(sizeof(omac_state));
55 if (omac == NULL) {
56 return CRYPT_MEM;
57 }
58
59 /* omac process the message */
60 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
61 goto LBL_ERR;
62 }
63 if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) {
64 goto LBL_ERR;
65 }
66 if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
67 goto LBL_ERR;
68 }
69
70 err = CRYPT_OK;
71 LBL_ERR:
72 #ifdef LTC_CLEAN_STACK
73 zeromem(omac, sizeof(omac_state));
74 #endif
75
76 XFREE(omac);
77 return err;
78 }
79
80 #endif
81
82 /* ref: $Format:%D$ */
83 /* git commit: $Format:%H$ */
84 /* commit time: $Format:%ai$ */
85