44 lines
913 B
C
44 lines
913 B
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_setiv(const unsigned char *IV, unsigned long len, symmetric_CTR *ctr)
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{
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int err;
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_ARGCHK(IV != NULL);
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_ARGCHK(ctr != NULL);
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/* bad param? */
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if ((err = cipher_is_valid(ctr->cipher)) != CRYPT_OK) {
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return err;
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}
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if (len != (unsigned long)ctr->blocklen) {
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return CRYPT_INVALID_ARG;
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}
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/* set IV */
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memcpy(ctr->ctr, IV, len);
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/* force next block */
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ctr->padlen = 0;
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cipher_descriptor[ctr->cipher].ecb_encrypt(IV, ctr->pad, &ctr->key);
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return CRYPT_OK;
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}
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#endif
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