+++ /dev/null
-/*
- * An implementation of the ARCFOUR algorithm
- *
- * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
- * SPDX-License-Identifier: GPL-2.0
- *
- * 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.
- *
- * This file is part of mbed TLS (https://tls.mbed.org)
- */
-/*
- * The ARCFOUR algorithm was publicly disclosed on 94/09.
- *
- * http://groups.google.com/group/sci.crypt/msg/10a300c9d21afca0
- */
-
-#if !defined(MBEDTLS_CONFIG_FILE)
-#include "mbedtls/config.h"
-#else
-#include MBEDTLS_CONFIG_FILE
-#endif
-
-#if defined(MBEDTLS_ARC4_C)
-
-#include "mbedtls/arc4.h"
-
-#include <string.h>
-
-#if defined(MBEDTLS_SELF_TEST)
-#if defined(MBEDTLS_PLATFORM_C)
-#include "mbedtls/platform.h"
-#else
-#include <stdio.h>
-#define mbedtls_printf printf
-#endif /* MBEDTLS_PLATFORM_C */
-#endif /* MBEDTLS_SELF_TEST */
-
-#if !defined(MBEDTLS_ARC4_ALT)
-
-/* Implementation that should never be optimized out by the compiler */
-static void mbedtls_zeroize( void *v, size_t n ) {
- volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
-}
-
-void mbedtls_arc4_init( mbedtls_arc4_context *ctx )
-{
- memset( ctx, 0, sizeof( mbedtls_arc4_context ) );
-}
-
-void mbedtls_arc4_free( mbedtls_arc4_context *ctx )
-{
- if( ctx == NULL )
- return;
-
- mbedtls_zeroize( ctx, sizeof( mbedtls_arc4_context ) );
-}
-
-/*
- * ARC4 key schedule
- */
-void mbedtls_arc4_setup( mbedtls_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 mbedtls_arc4_crypt( mbedtls_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 /* !MBEDTLS_ARC4_ALT */
-
-#if defined(MBEDTLS_SELF_TEST)
-/*
- * 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 mbedtls_arc4_self_test( int verbose )
-{
- int i, ret = 0;
- unsigned char ibuf[8];
- unsigned char obuf[8];
- mbedtls_arc4_context ctx;
-
- mbedtls_arc4_init( &ctx );
-
- for( i = 0; i < 3; i++ )
- {
- if( verbose != 0 )
- mbedtls_printf( " ARC4 test #%d: ", i + 1 );
-
- memcpy( ibuf, arc4_test_pt[i], 8 );
-
- mbedtls_arc4_setup( &ctx, arc4_test_key[i], 8 );
- mbedtls_arc4_crypt( &ctx, 8, ibuf, obuf );
-
- if( memcmp( obuf, arc4_test_ct[i], 8 ) != 0 )
- {
- if( verbose != 0 )
- mbedtls_printf( "failed\n" );
-
- ret = 1;
- goto exit;
- }
-
- if( verbose != 0 )
- mbedtls_printf( "passed\n" );
- }
-
- if( verbose != 0 )
- mbedtls_printf( "\n" );
-
-exit:
- mbedtls_arc4_free( &ctx );
-
- return( ret );
-}
-
-#endif /* MBEDTLS_SELF_TEST */
-
-#endif /* MBEDTLS_ARC4_C */
projects / reactos.git / blobdiff