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/*
* Copyright (c) 2002, 2003 Bob Deblier
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
/*!\file aes.h
* \brief AES block cipher, as specified by NIST FIPS 197.
* \author Bob Deblier <bob.deblier@pandora.be>
* \ingroup BC_m BC_aes_m
*/
#ifndef _AES_H
#define _AES_H
#include "beecrypt/beecrypt.h"
#include "beecrypt/aesopt.h"
/*!\brief Holds all the parameters necessary for the AES cipher.
* \ingroup BC_aes_m
*/
#ifdef __cplusplus
struct BEECRYPTAPI aesParam
#else
struct _aesParam
#endif
{
/*!\var k
* \brief Holds the key expansion.
*/
uint32_t k[64];
/*!\var nr
* \brief Number of rounds to be used in encryption/decryption.
*/
uint32_t nr;
/*!\var fdback
* \brief Buffer to be used by block chaining or feedback modes.
*/
uint32_t fdback[4];
};
#ifndef __cplusplus
typedef struct _aesParam aesParam;
#endif
#ifdef __cplusplus
extern "C" {
#endif
/*!\var aes
* \brief Holds the full API description of the AES algorithm.
*/
extern const BEECRYPTAPI blockCipher aes;
/*!\fn int aesSetup(aesParam* ap, const byte* key, size_t keybits, cipherOperation op)
* \brief This function performs the cipher's key expansion.
* \param ap The cipher's parameter block.
* \param key The key value.
* \param keybits The number of bits in the key; legal values are:
* 128, 192 and 256.
* \param op ENCRYPT or DECRYPT.
* \retval 0 on success.
* \retval -1 on failure.
*/
BEECRYPTAPI
int aesSetup (aesParam* ap, const byte* key, size_t keybits, cipherOperation op);
/*!\fn int aesSetIV(aesParam* ap, const byte* iv)
* \brief This function sets the Initialization Vector.
* \note This function is only useful in block chaining or feedback modes.
* \param ap The cipher's parameter block.
* \param iv The initialization vector; may be null.
* \retval 0 on success.
*/
BEECRYPTAPI
int aesSetIV (aesParam* ap, const byte* iv);
/*!\fn aesEncrypt(aesParam* ap, uint32_t* dst, const uint32_t* src)
* \brief This function performs the raw AES encryption; it encrypts one block
* of 128 bits.
* \param ap The cipher's parameter block.
* \param dst The ciphertext; should be aligned on 32-bit boundary.
* \param src The cleartext; should be aligned on 32-bit boundary.
* \retval 0 on success.
*/
BEECRYPTAPI
int aesEncrypt (aesParam* ap, uint32_t* dst, const uint32_t* src);
/*!\fn aesDecrypt(aesParam* ap, uint32_t* dst, const uint32_t* src)
* \brief This function performs the raw AES decryption; it decrypts one block
* of 128 bits.
* \param ap The cipher's parameter block.
* \param dst The cleartext; should be aligned on 32-bit boundary.
* \param src The ciphertext; should be aligned on 32-bit boundary.
* \retval 0 on success.
*/
BEECRYPTAPI
int aesDecrypt (aesParam* ap, uint32_t* dst, const uint32_t* src);
BEECRYPTAPI
uint32_t* aesFeedback(aesParam* ap);
#ifdef __cplusplus
}
#endif
#endif
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