/**
* \file arc4.h
*
* \brief The ARCFOUR stream cipher
*
* 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_ARC4_H
#define POLARSSL_ARC4_H
#include <string.h>
/**
* \brief ARC4 context structure
*/
typedef struct
{
int x; /*!< permutation index */
int y; /*!< permutation index */
unsigned char m[256]; /*!< permutation table */
}
arc4_context;
#ifdef __cplusplus
extern "C" {
#endif
/**
* \brief ARC4 key schedule
*
* \param ctx ARC4 context to be initialized
* \param key the secret key
* \param keylen length of the key
*/
void arc4_setup( arc4_context *ctx, const unsigned char *key, unsigned int keylen );
/**
* \brief ARC4 cipher function
*
* \param ctx ARC4 context
* \param length length of the input data
* \param input buffer holding the input data
* \param output buffer for the output data
*
* \return 0 if successful
*/
int arc4_crypt( arc4_context *ctx, size_t length, const unsigned char *input,
unsigned char *output );
/**
* \brief Checkup routine
*
* \return 0 if successful, or 1 if the test failed
*/
int arc4_self_test( int verbose );
#ifdef __cplusplus
}
#endif
#endif /* arc4.h */