arc4.c

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/*
 *  An implementation of the ARCFOUR algorithm
 *
 *  Copyright (C) 2006-2014, 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.
 */
/*
 *  The ARCFOUR algorithm was publicly disclosed on 94/09.
 *
 *  http://groups.google.com/group/sci.crypt/msg/10a300c9d21afca0
 */
 
#if !defined(POLARSSL_CONFIG_FILE)
#include "polarssl/config.h"
#else
#include POLARSSL_CONFIG_FILE
#endif
 
#if defined(POLARSSL_ARC4_C)
 
#include "polarssl/arc4.h"
 
#if defined(POLARSSL_PLATFORM_C)
#include "polarssl/platform.h"
#else
#define polarssl_printf printf
#endif
 
#if !defined(POLARSSL_ARC4_ALT)
 
/* Implementation that should never be optimized out by the compiler */
static void polarssl_zeroize( void *v, size_t n ) {
    volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
 
void arc4_init( arc4_context *ctx )
{
    memset( ctx, 0, sizeof( arc4_context ) );
}
 
void arc4_free( arc4_context *ctx )
{
    if( ctx == NULL )
        return;
 
    polarssl_zeroize( ctx, sizeof( arc4_context ) );
}
 
/*
 * ARC4 key schedule
 */
void arc4_setup( arc4_context *ctx, const unsigned char *key,
                 unsigned int keylen )
{
    int i, j, a;
    unsigned int k;
    unsigned char *m;
 
    ctx->x = 0;
    ctx->y = 0;
    m = ctx->m;
 
    for( i = 0; i < 256; i++ )
        m[i] = (unsigned char) i;
 
    j = k = 0;
 
    for( i = 0; i < 256; i++, k++ )
    {
        if( k >= keylen ) k = 0;
 
        a = m[i];
        j = ( j + a + key[k] ) & 0xFF;
        m[i] = m[j];
        m[j] = (unsigned char) a;
    }
}
 
/*
 * ARC4 cipher function
 */
int arc4_crypt( arc4_context *ctx, size_t length, const unsigned char *input,
                unsigned char *output )
{
    int x, y, a, b;
    size_t i;
    unsigned char *m;
 
    x = ctx->x;
    y = ctx->y;
    m = ctx->m;
 
    for( i = 0; i < length; i++ )
    {
        x = ( x + 1 ) & 0xFF; a = m[x];
        y = ( y + a ) & 0xFF; b = m[y];
 
        m[x] = (unsigned char) b;
        m[y] = (unsigned char) a;
 
        output[i] = (unsigned char)
            ( input[i] ^ m[(unsigned char)( a + b )] );
    }
 
    ctx->x = x;
    ctx->y = y;
 
    return( 0 );
}
 
#endif /* !POLARSSL_ARC4_ALT */
 
#if defined(POLARSSL_SELF_TEST)
 
#include <string.h>
#include <stdio.h>
 
/*
 * ARC4 tests vectors as posted by Eric Rescorla in sep. 1994:
 *
 * http://groups.google.com/group/comp.security.misc/msg/10a300c9d21afca0
 */
static const unsigned char arc4_test_key[3][8] =
{
    { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
    { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
};
 
static const unsigned char arc4_test_pt[3][8] =
{
    { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
    { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
};
 
static const unsigned char arc4_test_ct[3][8] =
{
    { 0x75, 0xB7, 0x87, 0x80, 0x99, 0xE0, 0xC5, 0x96 },
    { 0x74, 0x94, 0xC2, 0xE7, 0x10, 0x4B, 0x08, 0x79 },
    { 0xDE, 0x18, 0x89, 0x41, 0xA3, 0x37, 0x5D, 0x3A }
};
 
/*
 * Checkup routine
 */
int arc4_self_test( int verbose )
{
    int i, ret = 0;
    unsigned char ibuf[8];
    unsigned char obuf[8];
    arc4_context ctx;
 
    arc4_init( &ctx );
 
    for( i = 0; i < 3; i++ )
    {
        if( verbose != 0 )
            polarssl_printf( "  ARC4 test #%d: ", i + 1 );
 
        memcpy( ibuf, arc4_test_pt[i], 8 );
 
        arc4_setup( &ctx, arc4_test_key[i], 8 );
        arc4_crypt( &ctx, 8, ibuf, obuf );
 
        if( memcmp( obuf, arc4_test_ct[i], 8 ) != 0 )
        {
            if( verbose != 0 )
                polarssl_printf( "failed\n" );
 
            ret = 1;
            goto exit;
        }
 
        if( verbose != 0 )
            polarssl_printf( "passed\n" );
    }
 
    if( verbose != 0 )
        polarssl_printf( "\n" );
 
exit:
    arc4_free( &ctx );
 
    return( ret );
}
 
#endif /* POLARSSL_SELF_TEST */
 
#endif /* POLARSSL_ARC4_C */