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 #include "tomcrypt.h"
10
11 /**
12 @file hmac_memory.c
13 HMAC support, process a block of memory, Tom St Denis/Dobes Vandermeer
14 */
15
16 #ifdef LTC_HMAC
17
18 /**
19 HMAC a block of memory to produce the authentication tag
20 @param hash The index of the hash to use
21 @param key The secret key
22 @param keylen The length of the secret key (octets)
23 @param in The data to HMAC
24 @param inlen The length of the data to HMAC (octets)
25 @param out [out] Destination of the authentication tag
26 @param outlen [in/out] Max size and resulting size of authentication tag
27 @return CRYPT_OK if successful
28 */
hmac_memory(int hash,const unsigned char * key,unsigned long keylen,const unsigned char * in,unsigned long inlen,unsigned char * out,unsigned long * outlen)29 int hmac_memory(int hash,
30 const unsigned char *key, unsigned long keylen,
31 const unsigned char *in, unsigned long inlen,
32 unsigned char *out, unsigned long *outlen)
33 {
34 hmac_state *hmac;
35 int err;
36
37 LTC_ARGCHK(key != NULL);
38 LTC_ARGCHK(in != NULL);
39 LTC_ARGCHK(out != NULL);
40 LTC_ARGCHK(outlen != NULL);
41
42 /* make sure hash descriptor is valid */
43 if ((err = hash_is_valid(hash)) != CRYPT_OK) {
44 return err;
45 }
46
47 /* is there a descriptor? */
48 if (hash_descriptor[hash].hmac_block != NULL) {
49 return hash_descriptor[hash].hmac_block(key, keylen, in, inlen, out, outlen);
50 }
51
52 /* nope, so call the hmac functions */
53 /* allocate ram for hmac state */
54 hmac = XMALLOC(sizeof(hmac_state));
55 if (hmac == NULL) {
56 return CRYPT_MEM;
57 }
58
59 if ((err = hmac_init(hmac, hash, key, keylen)) != CRYPT_OK) {
60 goto LBL_ERR;
61 }
62
63 if ((err = hmac_process(hmac, in, inlen)) != CRYPT_OK) {
64 goto LBL_ERR;
65 }
66
67 if ((err = hmac_done(hmac, out, outlen)) != CRYPT_OK) {
68 goto LBL_ERR;
69 }
70
71 err = CRYPT_OK;
72 LBL_ERR:
73 #ifdef LTC_CLEAN_STACK
74 zeromem(hmac, sizeof(hmac_state));
75 #endif
76
77 XFREE(hmac);
78 return err;
79 }
80
81 #endif
82
83
84 /* ref: HEAD -> master, tag: v1.18.1 */
85 /* git commit: e08fd8630f9d9771226466877064055ee7e863d0 */
86 /* commit time: 2018-01-22 11:02:57 +0100 */
87