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