44 lines
1.0 KiB
C
44 lines
1.0 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
|
|
*
|
|
* LibTomCrypt is a library that provides various cryptographic
|
|
* algorithms in a highly modular and flexible manner.
|
|
*
|
|
* The library is free for all purposes without any express
|
|
* guarantee it works.
|
|
*
|
|
* Tom St Denis, tomstdenis@iahu.ca, http://libtomcrypt.org
|
|
*/
|
|
#include "mycrypt.h"
|
|
|
|
#ifdef CBC
|
|
|
|
int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key,
|
|
int keylen, int num_rounds, symmetric_CBC *cbc)
|
|
{
|
|
int x, err;
|
|
|
|
_ARGCHK(IV != NULL);
|
|
_ARGCHK(key != NULL);
|
|
_ARGCHK(cbc != NULL);
|
|
|
|
/* bad param? */
|
|
if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
|
|
return err;
|
|
}
|
|
|
|
/* setup cipher */
|
|
if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &cbc->key)) != CRYPT_OK) {
|
|
return err;
|
|
}
|
|
|
|
/* copy IV */
|
|
cbc->blocklen = cipher_descriptor[cipher].block_length;
|
|
cbc->cipher = cipher;
|
|
for (x = 0; x < cbc->blocklen; x++) {
|
|
cbc->IV[x] = IV[x];
|
|
}
|
|
return CRYPT_OK;
|
|
}
|
|
|
|
#endif
|