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/*
* An implementation of the ARC4 algorithm
*
* Copyright (C) 2001-2003 Christophe Devine
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "rc4.h"
void rc4_setup( struct rc4_state *s, const unsigned char *key, int length )
{
int i, j, k, *m, a;
s->x = 0;
s->y = 0;
m = s->m;
for( i = 0; i < 256; i++ )
{
m[i] = i;
}
j = k = 0;
for( i = 0; i < 256; i++ )
{
a = m[i];
j = (unsigned char) ( j + a + key[k] );
m[i] = m[j]; m[j] = a;
if( ++k >= length ) k = 0;
}
}
void rc4_crypt( struct rc4_state *s, unsigned char *data, int length )
{
int i, x, y, *m, a, b;
x = s->x;
y = s->y;
m = s->m;
for( i = 0; i < length; i++ )
{
x = (unsigned char) ( x + 1 ); a = m[x];
y = (unsigned char) ( y + a );
m[x] = b = m[y];
m[y] = a;
data[i] ^= m[(unsigned char) ( a + b )];
}
s->x = x;
s->y = y;
}
#ifdef TEST
#include <string.h>
#include <stdio.h>
/*
* ARC4 tests vectors from OpenSSL (crypto/rc4/rc4test.c)
*/
static unsigned char keys[7][30]={
{8,0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef},
{8,0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef},
{8,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
{4,0xef,0x01,0x23,0x45},
{8,0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef},
{4,0xef,0x01,0x23,0x45},
};
static unsigned char data_len[7]={8,8,8,20,28,10};
static unsigned char data[7][30]={
{0x01,0x23,0x45,0x67,0x89,0xab,0xcd,0xef,0xff},
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff},
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff},
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0xff},
{0x12,0x34,0x56,0x78,0x9A,0xBC,0xDE,0xF0,
0x12,0x34,0x56,0x78,0x9A,0xBC,0xDE,0xF0,
0x12,0x34,0x56,0x78,0x9A,0xBC,0xDE,0xF0,
0x12,0x34,0x56,0x78,0xff},
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0xff},
{0},
};
static unsigned char output[7][30]={
{0x75,0xb7,0x87,0x80,0x99,0xe0,0xc5,0x96,0x00},
{0x74,0x94,0xc2,0xe7,0x10,0x4b,0x08,0x79,0x00},
{0xde,0x18,0x89,0x41,0xa3,0x37,0x5d,0x3a,0x00},
{0xd6,0xa1,0x41,0xa7,0xec,0x3c,0x38,0xdf,
0xbd,0x61,0x5a,0x11,0x62,0xe1,0xc7,0xba,
0x36,0xb6,0x78,0x58,0x00},
{0x66,0xa0,0x94,0x9f,0x8a,0xf7,0xd6,0x89,
0x1f,0x7f,0x83,0x2b,0xa8,0x33,0xc0,0x0c,
0x89,0x2e,0xbe,0x30,0x14,0x3c,0xe2,0x87,
0x40,0x01,0x1e,0xcf,0x00},
{0xd6,0xa1,0x41,0xa7,0xec,0x3c,0x38,0xdf,0xbd,0x61,0x00},
{0},
};
int main( void )
{
int i;
struct rc4_state s;
unsigned char buffer[30];
printf( "\n RC4 Validation Tests:\n\n" );
for( i = 0; i < 6; i++ )
{
printf( " Test %d ", i + 1 );
memcpy( buffer, data[i], data_len[i] );
rc4_setup( &s, &keys[i][1], keys[i][0] );
rc4_crypt( &s, buffer, data_len[i] );
if( memcmp( buffer, output[i], data_len[i] ) )
{
printf( "failed!\n" );
return( 1 );
}
printf( "passed.\n" );
}
printf( "\n" );
return( 0 );
}
#endif
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