35 lines
887 B
C
35 lines
887 B
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis */
|
|
/* SPDX-License-Identifier: Unlicense */
|
|
#include "tomcrypt_private.h"
|
|
|
|
/**
|
|
@file cfb_getiv.c
|
|
CFB implementation, get IV, Tom St Denis
|
|
*/
|
|
|
|
#ifdef LTC_CFB_MODE
|
|
|
|
/**
|
|
Get the current initialization vector
|
|
@param IV [out] The destination of the initialization vector
|
|
@param len [in/out] The max size and resulting size of the initialization vector
|
|
@param cfb The CFB state
|
|
@return CRYPT_OK if successful
|
|
*/
|
|
int cfb_getiv(unsigned char *IV, unsigned long *len, const symmetric_CFB *cfb)
|
|
{
|
|
LTC_ARGCHK(IV != NULL);
|
|
LTC_ARGCHK(len != NULL);
|
|
LTC_ARGCHK(cfb != NULL);
|
|
if ((unsigned long)cfb->ecb.blocklen > *len) {
|
|
*len = cfb->ecb.blocklen;
|
|
return CRYPT_BUFFER_OVERFLOW;
|
|
}
|
|
XMEMCPY(IV, cfb->pad, cfb->ecb.blocklen);
|
|
*len = cfb->ecb.blocklen;
|
|
|
|
return CRYPT_OK;
|
|
}
|
|
|
|
#endif
|