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 #include <stdarg.h>
12
13 /**
14 @file omac_memory_multi.c
15 OMAC1 support, process multiple blocks of memory, Tom St Denis
16 */
17
18 #ifdef LTC_OMAC
19
20 /**
21 OMAC multiple blocks 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 out [out] The destination of the authentication tag
26 @param outlen [in/out] The max size and resulting size of the authentication tag (octets)
27 @param in The data to send through OMAC
28 @param inlen The length of the data to send through OMAC (octets)
29 @param ... tuples of (data,len) pairs to OMAC, terminated with a (NULL,x) (x=don't care)
30 @return CRYPT_OK if successful
31 */
omac_memory_multi(int cipher,const unsigned char * key,unsigned long keylen,unsigned char * out,unsigned long * outlen,const unsigned char * in,unsigned long inlen,...)32 int omac_memory_multi(int cipher,
33 const unsigned char *key, unsigned long keylen,
34 unsigned char *out, unsigned long *outlen,
35 const unsigned char *in, unsigned long inlen, ...)
36 {
37 int err;
38 omac_state *omac;
39 va_list args;
40 const unsigned char *curptr;
41 unsigned long curlen;
42
43 LTC_ARGCHK(key != NULL);
44 LTC_ARGCHK(in != NULL);
45 LTC_ARGCHK(out != NULL);
46 LTC_ARGCHK(outlen != NULL);
47
48 /* allocate ram for omac state */
49 omac = XMALLOC(sizeof(omac_state));
50 if (omac == NULL) {
51 return CRYPT_MEM;
52 }
53
54 /* omac process the message */
55 if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
56 goto LBL_ERR;
57 }
58 va_start(args, inlen);
59 curptr = in;
60 curlen = inlen;
61 for (;;) {
62 /* process buf */
63 if ((err = omac_process(omac, curptr, curlen)) != CRYPT_OK) {
64 goto LBL_ERR;
65 }
66 /* step to next */
67 curptr = va_arg(args, const unsigned char*);
68 if (curptr == NULL) {
69 break;
70 }
71 curlen = va_arg(args, unsigned long);
72 }
73 if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
74 goto LBL_ERR;
75 }
76 LBL_ERR:
77 #ifdef LTC_CLEAN_STACK
78 zeromem(omac, sizeof(omac_state));
79 #endif
80 XFREE(omac);
81 va_end(args);
82 return err;
83 }
84
85 #endif
86
87 /* ref: $Format:%D$ */
88 /* git commit: $Format:%H$ */
89 /* commit time: $Format:%ai$ */
90