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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.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
*/
#include "tomcrypt.h"
/**
@file lrw_decrypt.c
LRW_MODE implementation, Decrypt blocks, Tom St Denis
*/
#ifdef LTC_LRW_MODE
/**
LRW decrypt blocks
@param ct The ciphertext
@param pt [out] The plaintext
@param len The length in octets, must be a multiple of 16
@param lrw The LRW state
*/
int lrw_decrypt(const unsigned char *ct, unsigned char *pt, unsigned long len, symmetric_LRW *lrw)
{
int err;
LTC_ARGCHK(pt != NULL);
LTC_ARGCHK(ct != NULL);
LTC_ARGCHK(lrw != NULL);
if ((err = cipher_is_valid(lrw->cipher)) != CRYPT_OK) {
return err;
}
if (cipher_descriptor[lrw->cipher].accel_lrw_decrypt != NULL) {
return cipher_descriptor[lrw->cipher].accel_lrw_decrypt(ct, pt, len, lrw->IV, lrw->tweak, &lrw->key);
}
return lrw_process(ct, pt, len, LRW_DECRYPT, lrw);
}
#endif
/* $Source$ */
/* $Revision$ */
/* $Date$ */
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