Mercurial > dropbear

comparison ocb_done_decrypt.c @ 143:5d99163f7e32 libtomcrypt-orig

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
import of libtomcrypt 0.99
author Matt Johnston <matt@ucc.asn.au>
date Sun, 19 Dec 2004 11:34:45 +0000
parents 7faae8f46238
children
comparison
equal deleted inserted replaced
15:6362d3854bb4 143:5d99163f7e32
18 const unsigned char *ct, unsigned long ctlen, 18 const unsigned char *ct, unsigned long ctlen,
19 unsigned char *pt, 19 unsigned char *pt,
20 const unsigned char *tag, unsigned long taglen, int *res) 20 const unsigned char *tag, unsigned long taglen, int *res)
21 { 21 {
22 int err; 22 int err;
23 unsigned char tagbuf[MAXBLOCKSIZE]; 23 unsigned char *tagbuf;
24 unsigned long tagbuflen; 24 unsigned long tagbuflen;
25 25
26 _ARGCHK(ocb != NULL); 26 _ARGCHK(ocb != NULL);
27 _ARGCHK(pt != NULL); 27 _ARGCHK(pt != NULL);
28 _ARGCHK(ct != NULL); 28 _ARGCHK(ct != NULL);
29 _ARGCHK(tag != NULL); 29 _ARGCHK(tag != NULL);
30 _ARGCHK(res != NULL); 30 _ARGCHK(res != NULL);
31 31
32 /* default to failed */
32 *res = 0; 33 *res = 0;
33 34
34 tagbuflen = sizeof(tagbuf); 35 /* allocate memory */
36 tagbuf = XMALLOC(MAXBLOCKSIZE);
37 if (tagbuf == NULL) {
38 return CRYPT_MEM;
39 }
40
41 tagbuflen = MAXBLOCKSIZE;
35 if ((err = __ocb_done(ocb, ct, ctlen, pt, tagbuf, &tagbuflen, 1)) != CRYPT_OK) { 42 if ((err = __ocb_done(ocb, ct, ctlen, pt, tagbuf, &tagbuflen, 1)) != CRYPT_OK) {
36 return err; 43 goto __ERR;
37 } 44 }
38 45
39 if (taglen <= tagbuflen && memcmp(tagbuf, tag, taglen) == 0) { 46 if (taglen <= tagbuflen && memcmp(tagbuf, tag, taglen) == 0) {
40 *res = 1; 47 *res = 1;
41 } 48 }
42 49
50 err = CRYPT_OK;
51 __ERR:
43 #ifdef CLEAN_STACK 52 #ifdef CLEAN_STACK
44 zeromem(tagbuf, sizeof(tagbuf)); 53 zeromem(tagbuf, MAXBLOCKSIZE);
45 #endif 54 #endif
46 55
47 return CRYPT_OK; 56 XFREE(tagbuf);
57
58 return err;
48 } 59 }
49 60
50 #endif 61 #endif
51 62