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/*
* Copyright (c) 2001-2007, Tom St Denis
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/* LibTomCrypt, modular cryptographic library -- Tom St Denis
*
* LibTomCrypt is a library that provides various cryptographic
* algorithms in a highly modular and flexible manner.
*
* The library is free for all purposes without any express
* guarantee it works.
*
* Tom St Denis, tomstdenis@gmail.com, http://libtom.org
*/
#include "tomcrypt.h"
/**
@file omac_memory.c
LTC_OMAC1 support, process a block of memory, Tom St Denis
*/
#ifdef LTC_OMAC
/**
LTC_OMAC a block of memory
@param cipher The index of the desired cipher
@param key The secret key
@param keylen The length of the secret key (octets)
@param in The data to send through LTC_OMAC
@param inlen The length of the data to send through LTC_OMAC (octets)
@param out [out] The destination of the authentication tag
@param outlen [in/out] The max size and resulting size of the authentication tag (octets)
@return CRYPT_OK if successful
*/
int omac_memory(int cipher,
const unsigned char *key, unsigned long keylen,
const unsigned char *in, unsigned long inlen,
unsigned char *out, unsigned long *outlen)
{
int err;
omac_state *omac;
LTC_ARGCHK(key != NULL);
LTC_ARGCHK(in != NULL);
LTC_ARGCHK(out != NULL);
LTC_ARGCHK(outlen != NULL);
/* is the cipher valid? */
if ((err = cipher_is_valid(cipher)) != CRYPT_OK) {
return err;
}
/* Use accelerator if found */
if (cipher_descriptor[cipher]->omac_memory != NULL) {
return cipher_descriptor[cipher]->omac_memory(key, keylen, in, inlen, out, outlen);
}
/* allocate ram for omac state */
omac = XMALLOC(sizeof(omac_state));
if (omac == NULL) {
return CRYPT_MEM;
}
/* omac process the message */
if ((err = omac_init(omac, cipher, key, keylen)) != CRYPT_OK) {
goto LBL_ERR;
}
if ((err = omac_process(omac, in, inlen)) != CRYPT_OK) {
goto LBL_ERR;
}
if ((err = omac_done(omac, out, outlen)) != CRYPT_OK) {
goto LBL_ERR;
}
err = CRYPT_OK;
LBL_ERR:
#ifdef LTC_CLEAN_STACK
zeromem(omac, sizeof(omac_state));
#endif
XFREE(omac);
return err;
}
#endif
/* $Source: /cvs/libtom/libtomcrypt/src/mac/omac/omac_memory.c,v $ */
/* $Revision: 1.8 $ */
/* $Date: 2007/05/12 14:37:41 $ */
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