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/* 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.
*/
#include "tomcrypt.h"
/**
@file cbc_start.c
CBC implementation, start chain, Tom St Denis
*/
#ifdef LTC_CBC_MODE
/**
Initialize a CBC context
@param cipher The index of the cipher desired
@param IV The initialization vector
@param key The secret key
@param keylen The length of the secret key (octets)
@param num_rounds Number of rounds in the cipher desired (0 for default)
@param cbc The CBC state to initialize
@return CRYPT_OK if successful
*/
int cbc_start(int cipher, const unsigned char *IV, const unsigned char *key,
int keylen, int num_rounds, symmetric_CBC *cbc)
{
int x, err;
LTC_ARGCHK(IV != NULL);
LTC_ARGCHK(key != NULL);
LTC_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
/* ref: $Format:%D$ */
/* git commit: $Format:%H$ */
/* commit time: $Format:%ai$ */
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