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comparison libtomcrypt/src/mac/hmac/hmac_done.c @ 1056:a2bfd4374878 nocircbuffer

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Avoid malloc in hmac
author Matt Johnston <matt@ucc.asn.au>
date Sun, 01 Mar 2015 14:46:04 +0800
parents 0cbe8f6dbf9e
children f849a5ca2efc
comparison
equal deleted inserted replaced
1055:4d7b4c5526c5 1056:a2bfd4374878
26 @param outlen [in/out] The max size and resulting size of the HMAC authentication tag 26 @param outlen [in/out] The max size and resulting size of the HMAC authentication tag
27 @return CRYPT_OK if successful 27 @return CRYPT_OK if successful
28 */ 28 */
29 int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen) 29 int hmac_done(hmac_state *hmac, unsigned char *out, unsigned long *outlen)
30 { 30 {
31 unsigned char *buf, *isha; 31 unsigned char buf[MAXBLOCKSIZE], isha[MAXBLOCKSIZE];
32 unsigned long hashsize, i; 32 unsigned long hashsize, i;
33 int hash, err; 33 int hash, err;
34 34
35 LTC_ARGCHK(hmac != NULL); 35 LTC_ARGCHK(hmac != NULL);
36 LTC_ARGCHK(out != NULL); 36 LTC_ARGCHK(out != NULL);
41 return err; 41 return err;
42 } 42 }
43 43
44 /* get the hash message digest size */ 44 /* get the hash message digest size */
45 hashsize = hash_descriptor[hash].hashsize; 45 hashsize = hash_descriptor[hash].hashsize;
46
47 /* allocate buffers */
48 buf = XMALLOC(HMAC_BLOCKSIZE);
49 isha = XMALLOC(hashsize);
50 if (buf == NULL || isha == NULL) {
51 if (buf != NULL) {
52 XFREE(buf);
53 }
54 if (isha != NULL) {
55 XFREE(isha);
56 }
57 return CRYPT_MEM;
58 }
59 46
60 /* Get the hash of the first HMAC vector plus the data */ 47 /* Get the hash of the first HMAC vector plus the data */
61 if ((err = hash_descriptor[hash].done(&hmac->md, isha)) != CRYPT_OK) { 48 if ((err = hash_descriptor[hash].done(&hmac->md, isha)) != CRYPT_OK) {
62 goto LBL_ERR; 49 goto LBL_ERR;
63 } 50 }
94 zeromem(isha, hashsize); 81 zeromem(isha, hashsize);
95 zeromem(buf, hashsize); 82 zeromem(buf, hashsize);
96 zeromem(hmac, sizeof(*hmac)); 83 zeromem(hmac, sizeof(*hmac));
97 #endif 84 #endif
98 85
99 XFREE(isha);
100 XFREE(buf);
101
102 return err; 86 return err;
103 } 87 }
104 88
105 #endif 89 #endif
106 90