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libtomcrypt/ctr_start.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 CTR

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int ctr_start(int cipher, const unsigned char *count, const unsigned char *key, int keylen, 

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              int num_rounds, symmetric_CTR *ctr)

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{

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   int x, err;

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   _ARGCHK(count != NULL);

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   _ARGCHK(key != NULL);

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   _ARGCHK(ctr != NULL);

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   /* bad param? */

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   if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {

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      return err;

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   }

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   /* setup cipher */

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   if ((err = cipher_descriptor[cipher].setup(key, keylen, num_rounds, &ctr->key)) != CRYPT_OK) {

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      return err;

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   }

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   /* copy ctr */

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   ctr->blocklen = cipher_descriptor[cipher].block_length;

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   ctr->cipher   = cipher;

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   ctr->padlen   = 0;

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   ctr->mode     = 0;

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   for (x = 0; x < ctr->blocklen; x++) {

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       ctr->ctr[x] = count[x];

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   }

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   cipher_descriptor[ctr->cipher].ecb_encrypt(ctr->ctr, ctr->pad, &ctr->key);

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   return CRYPT_OK;

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}

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#endif

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