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 hmac_memory_multi.c
15 HMAC support, process multiple blocks of memory, Tom St Denis/Dobes Vandermeer
16 */
17
18 #ifdef LTC_HMAC
19
20 /**
21 HMAC multiple blocks of memory to produce the authentication tag
22 @param hash The index of the hash to use
23 @param key The secret key
24 @param keylen The length of the secret key (octets)
25 @param out [out] Destination of the authentication tag
26 @param outlen [in/out] Max size and resulting size of authentication tag
27 @param in The data to HMAC
28 @param inlen The length of the data to HMAC (octets)
29 @param ... tuples of (data,len) pairs to HMAC, terminated with a (NULL,x) (x=don't care)
30 @return CRYPT_OK if successful
31 */
hmac_memory_multi(int hash,const unsigned char * key,unsigned long keylen,unsigned char * out,unsigned long * outlen,const unsigned char * in,unsigned long inlen,...)32 int hmac_memory_multi(int hash,
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 {
38 hmac_state *hmac;
39 int err;
40 va_list args;
41 const unsigned char *curptr;
42 unsigned long curlen;
43
44 LTC_ARGCHK(key != NULL);
45 LTC_ARGCHK(in != NULL);
46 LTC_ARGCHK(out != NULL);
47 LTC_ARGCHK(outlen != NULL);
48
49 /* allocate ram for hmac state */
50 hmac = XMALLOC(sizeof(hmac_state));
51 if (hmac == NULL) {
52 return CRYPT_MEM;
53 }
54
55 if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {
56 goto LBL_ERR;
57 }
58
59 va_start(args, inlen);
60 curptr = in;
61 curlen = inlen;
62 for (;;) {
63 /* process buf */
64 if ((err = hmac_process(hmac, curptr, curlen)) != CRYPT_OK) {
65 goto LBL_ERR;
66 }
67 /* step to next */
68 curptr = va_arg(args, const unsigned char*);
69 if (curptr == NULL) {
70 break;
71 }
72 curlen = va_arg(args, unsigned long);
73 }
74 if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) {
75 goto LBL_ERR;
76 }
77 LBL_ERR:
78 #ifdef LTC_CLEAN_STACK
79 zeromem(hmac, sizeof(hmac_state));
80 #endif
81 XFREE(hmac);
82 va_end(args);
83 return err;
84 }
85
86 #endif
87
88
89 /* ref: $Format:%D$ */
90 /* git commit: $Format:%H$ */
91 /* commit time: $Format:%ai$ */
92