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libtomcrypt/ofb_setiv.c

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/* 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@iahu.ca, http://libtomcrypt.org

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 */

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#include "mycrypt.h"

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#ifdef OFB

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int ofb_setiv(const unsigned char *IV, unsigned long len, symmetric_OFB *ofb)

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{

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   int err;

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   _ARGCHK(IV  != NULL);

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   _ARGCHK(ofb != NULL);

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   if ((err = cipher_is_valid(ofb->cipher)) != CRYPT_OK) {

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       return err;

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   }

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   if (len != (unsigned long)ofb->blocklen) {

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      return CRYPT_INVALID_ARG;

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   }

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   /* force next block */

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   ofb->padlen = 0;

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   cipher_descriptor[ofb->cipher].ecb_encrypt(IV, ofb->IV, &ofb->key);

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   return CRYPT_OK;

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}

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#endif 

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