Mercurial > dropbear

comparison cbc_encrypt.c @ 0:d7da3b1e1540 libtomcrypt

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
put back the 0.95 makefile which was inadvertently merged over
author Matt Johnston <matt@ucc.asn.au>
date Mon, 31 May 2004 18:21:40 +0000
parents
children
comparison
equal deleted inserted replaced
-1:000000000000 0:d7da3b1e1540
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 * Tom St Denis, [email protected], http://libtomcrypt.org
10 */
11 #include "mycrypt.h"
12
13 #ifdef CBC
14
15 int cbc_encrypt(const unsigned char *pt, unsigned char *ct, symmetric_CBC *cbc)
16 {
17 int x, err;
18 unsigned char tmp[MAXBLOCKSIZE];
19
20 _ARGCHK(pt != NULL);
21 _ARGCHK(ct != NULL);
22 _ARGCHK(cbc != NULL);
23
24 if ((err = cipher_is_valid(cbc->cipher)) != CRYPT_OK) {
25 return err;
26 }
27
28 /* is blocklen valid? */
29 if (cbc->blocklen < 0 || cbc->blocklen > (int)sizeof(cbc->IV)) {
30 return CRYPT_INVALID_ARG;
31 }
32
33 /* xor IV against plaintext */
34 for (x = 0; x < cbc->blocklen; x++) {
35 tmp[x] = pt[x] ^ cbc->IV[x];
36 }
37
38 /* encrypt */
39 cipher_descriptor[cbc->cipher].ecb_encrypt(tmp, ct, &cbc->key);
40
41 /* store IV [ciphertext] for a future block */
42 for (x = 0; x < cbc->blocklen; x++) {
43 cbc->IV[x] = ct[x];
44 }
45
46 #ifdef CLEAN_STACK
47 zeromem(tmp, sizeof(tmp));
48 #endif
49 return CRYPT_OK;
50 }
51
52 #endif