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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://libtomcrypt.org
*/
#include "tomcrypt.h"
/**
@file ctr_setiv.c
CTR implementation, set IV, Tom St Denis
*/
#ifdef CTR
/**
Set an initial vector
@param IV The initial vector
@param len The length of the vector (in octets)
@param ctr The CTR state
@return CRYPT_OK if successful
*/
int ctr_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr)
{
int err;
LTC_ARGCHK(IV != NULL);
LTC_ARGCHK(ctr != NULL);
/* bad param? */
if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
return err;
}
if (len != (unsigned long)ctr->blocklen) {
return CRYPT_INVALID_ARG;
}
/* set IV */
XMEMCPY(ctr->ctr, IV, len);
/* force next block */
ctr->padlen = 0;
cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
return CRYPT_OK;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_setiv.c,v $ */
/* $Revision: 1.3 $ */
/* $Date: 2005/05/05 14:35:59 $ */
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