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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 ofb_getiv.c
OFB implementation, get IV, Tom St Denis
*/
#ifdef LTC_OFB_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 ofb The OFB state
@return CRYPT_OK if successful
*/
int ofb_getiv(unsigned char *IV, unsigned long *len, symmetric_OFB *ofb)
{
LTC_ARGCHK(IV != NULL);
LTC_ARGCHK(len != NULL);
LTC_ARGCHK(ofb != NULL);
if ((unsigned long)ofb->blocklen > *len) {
*len = ofb->blocklen;
return CRYPT_BUFFER_OVERFLOW;
}
XMEMCPY(IV, ofb->IV, ofb->blocklen);
*len = ofb->blocklen;
return CRYPT_OK;
}
#endif
/* $Source$ */
/* $Revision$ */
/* $Date$ */
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