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/**
* \file aes.h
*
* Copyright (C) 2011, Con Kolivas <kernel@kolivas.org>
* Copyright (C) 2006-2010, Brainspark B.V.
*
* This file is part of PolarSSL (http://www.polarssl.org)
* Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
*
* All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef POLARSSL_AES_H
#define POLARSSL_AES_H

#define AES_ENCRYPT 1
#define AES_DECRYPT 0

#define POLARSSL_ERR_AES_INVALID_KEY_LENGTH -0x0800
#define POLARSSL_ERR_AES_INVALID_INPUT_LENGTH -0x0810

/**
* \brief AES context structure
*/
typedef struct
{
    int nr; /*!< number of rounds */
    unsigned long *rk; /*!< AES round keys */
    unsigned long buf[68]; /*!< unaligned data */
}
aes_context;

#ifdef __cplusplus
extern "C" {
#endif

/**
* \brief AES key schedule (encryption)
*
* \param ctx AES context to be initialized
* \param key encryption key
* \param keysize must be 128, 192 or 256
*
* \return 0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH
*/
int aes_setkey_enc( aes_context *ctx, const unsigned char *key, int keysize );

/**
* \brief AES key schedule (decryption)
*
* \param ctx AES context to be initialized
* \param key decryption key
* \param keysize must be 128, 192 or 256
*
* \return 0 if successful, or POLARSSL_ERR_AES_INVALID_KEY_LENGTH
*/
int aes_setkey_dec( aes_context *ctx, const unsigned char *key, int keysize );

/**
* \brief AES-ECB block encryption/decryption
*
* \param ctx AES context
* \param mode AES_ENCRYPT or AES_DECRYPT
* \param input 16-byte input block
* \param output 16-byte output block
*
* \return 0 if successful
*/
int aes_crypt_ecb( aes_context *ctx,
                    int mode,
                    const unsigned char input[16],
                    unsigned char output[16] );

/**
* \brief AES-CBC buffer encryption/decryption
* Length should be a multiple of the block
* size (16 bytes)
*
* \param ctx AES context
* \param mode AES_ENCRYPT or AES_DECRYPT
* \param length length of the input data
* \param iv initialization vector (updated after use)
* \param input buffer holding the input data
* \param output buffer holding the output data
*
* \return 0 if successful, or POLARSSL_ERR_AES_INVALID_INPUT_LENGTH
*/
int aes_crypt_cbc( aes_context *ctx,
                    int mode,
                    long long int length,
                    unsigned char iv[16],
                    const unsigned char *input,
                    unsigned char *output );

/**
* \brief AES-CFB128 buffer encryption/decryption.
*
* \param ctx AES context
* \param mode AES_ENCRYPT or AES_DECRYPT
* \param length length of the input data
* \param iv_off offset in IV (updated after use)
* \param iv initialization vector (updated after use)
* \param input buffer holding the input data
* \param output buffer holding the output data
*
* \return 0 if successful
*/
int aes_crypt_cfb128( aes_context *ctx,
                       int mode,
                       int length,
                       int *iv_off,
                       unsigned char iv[16],
                       const unsigned char *input,
                       unsigned char *output );

/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int aes_self_test( int verbose );

#ifdef __cplusplus
}
#endif

#endif /* aes.h */
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