Tom St Denis
54 lines
1.1 KiB
C
54 lines
1.1 KiB
C
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
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*
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* LibTomCrypt is a library that provides various cryptographic
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* algorithms in a highly modular and flexible manner.
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*
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* The library is free for all purposes without any express
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* guarantee it works.
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*
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* Tom St Denis, tomstdenis@gmail.com, http://libtomcrypt.org
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*/
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#include "tomcrypt.h"
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/**
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@file cfb_setiv.c
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CFB implementation, set IV, Tom St Denis
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*/
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#ifdef CFB
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/**
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Set an initial vector
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@param IV The initial vector
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@param len The length of the vector (in octets)
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@param cfb The CFB state
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@return CRYPT_OK if successful
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*/
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int cfb_setiv(const unsigned char *IV, unsigned long len, symmetric_CFB *cfb)
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{
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int err;
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LTC_ARGCHK(IV != NULL);
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LTC_ARGCHK(cfb != NULL);
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if ((err = cipher_is_valid(cfb->cipher)) != CRYPT_OK) {
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return err;
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}
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if (len != (unsigned long)cfb->blocklen) {
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return CRYPT_INVALID_ARG;
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}
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/* force next block */
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cfb->padlen = 0;
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cipher_descriptor[cfb->cipher].ecb_encrypt(IV, cfb->IV, &cfb->key);
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return CRYPT_OK;
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}
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#endif
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/* $Source$ */
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/* $Revision$ */
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/* $Date$ */
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