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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.com
*/
#include "tomcrypt.h"
/**
@file ctr_getiv.c
CTR implementation, get IV, Tom St Denis
*/
#ifdef LTC_CTR_MODE
/**
Get the current initial vector
@param IV [out] The destination of the initial vector
@param len [in/out] The max size and resulting size of the initial vector
@param ctr The CTR state
@return CRYPT_OK if successful
*/
int ctr_getiv(unsigned char *IV, unsigned long *len, symmetric_CTR *ctr)
{
LTC_ARGCHK(IV != NULL);
LTC_ARGCHK(len != NULL);
LTC_ARGCHK(ctr != NULL);
if ((unsigned long)ctr->blocklen > *len) {
*len = ctr->blocklen;
return CRYPT_BUFFER_OVERFLOW;
}
XMEMCPY(IV, ctr->ctr, ctr->blocklen);
*len = ctr->blocklen;
return CRYPT_OK;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/modes/ctr/ctr_getiv.c,v $ */
/* $Revision: 1.6 $ */
/* $Date: 2006/06/29 01:46:46 $ */
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