Austin Blackstone / Mbed 2 deprecated client-lwip-lightswitch-demo-expanded

mbed client lightswitch demo

Dependencies:   mbed Socket lwip-eth lwip-sys lwip

Fork of mbed-client-classic-example-lwip by Austin Blackstone

mbedtls/source/arc4.c@11:cada08fc8a70, 2016-06-09 (annotated)

Committer:
mbedAustin
Date:
Thu Jun 09 17:08:36 2016 +0000
Revision:
11:cada08fc8a70
Commit for public Consumption

Who changed what in which revision?

UserRevisionLine numberNew contents of line
mbedAustin 11:cada08fc8a70 1 /*
mbedAustin 11:cada08fc8a70 2 * An implementation of the ARCFOUR algorithm
mbedAustin 11:cada08fc8a70 3 *
mbedAustin 11:cada08fc8a70 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
mbedAustin 11:cada08fc8a70 5 * SPDX-License-Identifier: Apache-2.0
mbedAustin 11:cada08fc8a70 6 *
mbedAustin 11:cada08fc8a70 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
mbedAustin 11:cada08fc8a70 8 * not use this file except in compliance with the License.
mbedAustin 11:cada08fc8a70 9 * You may obtain a copy of the License at
mbedAustin 11:cada08fc8a70 10 *
mbedAustin 11:cada08fc8a70 11 * http://www.apache.org/licenses/LICENSE-2.0
mbedAustin 11:cada08fc8a70 12 *
mbedAustin 11:cada08fc8a70 13 * Unless required by applicable law or agreed to in writing, software
mbedAustin 11:cada08fc8a70 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
mbedAustin 11:cada08fc8a70 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
mbedAustin 11:cada08fc8a70 16 * See the License for the specific language governing permissions and
mbedAustin 11:cada08fc8a70 17 * limitations under the License.
mbedAustin 11:cada08fc8a70 18 *
mbedAustin 11:cada08fc8a70 19 * This file is part of mbed TLS (https://tls.mbed.org)
mbedAustin 11:cada08fc8a70 20 */
mbedAustin 11:cada08fc8a70 21 /*
mbedAustin 11:cada08fc8a70 22 * The ARCFOUR algorithm was publicly disclosed on 94/09.
mbedAustin 11:cada08fc8a70 23 *
mbedAustin 11:cada08fc8a70 24 * http://groups.google.com/group/sci.crypt/msg/10a300c9d21afca0
mbedAustin 11:cada08fc8a70 25 */
mbedAustin 11:cada08fc8a70 26
mbedAustin 11:cada08fc8a70 27 #if !defined(MBEDTLS_CONFIG_FILE)
mbedAustin 11:cada08fc8a70 28 #include "mbedtls/config.h"
mbedAustin 11:cada08fc8a70 29 #else
mbedAustin 11:cada08fc8a70 30 #include MBEDTLS_CONFIG_FILE
mbedAustin 11:cada08fc8a70 31 #endif
mbedAustin 11:cada08fc8a70 32
mbedAustin 11:cada08fc8a70 33 #if defined(MBEDTLS_ARC4_C)
mbedAustin 11:cada08fc8a70 34
mbedAustin 11:cada08fc8a70 35 #include "mbedtls/arc4.h"
mbedAustin 11:cada08fc8a70 36
mbedAustin 11:cada08fc8a70 37 #include <string.h>
mbedAustin 11:cada08fc8a70 38
mbedAustin 11:cada08fc8a70 39 #if defined(MBEDTLS_SELF_TEST)
mbedAustin 11:cada08fc8a70 40 #if defined(MBEDTLS_PLATFORM_C)
mbedAustin 11:cada08fc8a70 41 #include "mbedtls/platform.h"
mbedAustin 11:cada08fc8a70 42 #else
mbedAustin 11:cada08fc8a70 43 #include <stdio.h>
mbedAustin 11:cada08fc8a70 44 #define mbedtls_printf printf
mbedAustin 11:cada08fc8a70 45 #endif /* MBEDTLS_PLATFORM_C */
mbedAustin 11:cada08fc8a70 46 #endif /* MBEDTLS_SELF_TEST */
mbedAustin 11:cada08fc8a70 47
mbedAustin 11:cada08fc8a70 48 #if !defined(MBEDTLS_ARC4_ALT)
mbedAustin 11:cada08fc8a70 49
mbedAustin 11:cada08fc8a70 50 /* Implementation that should never be optimized out by the compiler */
mbedAustin 11:cada08fc8a70 51 static void mbedtls_zeroize( void *v, size_t n ) {
mbedAustin 11:cada08fc8a70 52 volatile unsigned char *p = v; while( n-- ) *p++ = 0;
mbedAustin 11:cada08fc8a70 53 }
mbedAustin 11:cada08fc8a70 54
mbedAustin 11:cada08fc8a70 55 void mbedtls_arc4_init( mbedtls_arc4_context *ctx )
mbedAustin 11:cada08fc8a70 56 {
mbedAustin 11:cada08fc8a70 57 memset( ctx, 0, sizeof( mbedtls_arc4_context ) );
mbedAustin 11:cada08fc8a70 58 }
mbedAustin 11:cada08fc8a70 59
mbedAustin 11:cada08fc8a70 60 void mbedtls_arc4_free( mbedtls_arc4_context *ctx )
mbedAustin 11:cada08fc8a70 61 {
mbedAustin 11:cada08fc8a70 62 if( ctx == NULL )
mbedAustin 11:cada08fc8a70 63 return;
mbedAustin 11:cada08fc8a70 64
mbedAustin 11:cada08fc8a70 65 mbedtls_zeroize( ctx, sizeof( mbedtls_arc4_context ) );
mbedAustin 11:cada08fc8a70 66 }
mbedAustin 11:cada08fc8a70 67
mbedAustin 11:cada08fc8a70 68 /*
mbedAustin 11:cada08fc8a70 69 * ARC4 key schedule
mbedAustin 11:cada08fc8a70 70 */
mbedAustin 11:cada08fc8a70 71 void mbedtls_arc4_setup( mbedtls_arc4_context *ctx, const unsigned char *key,
mbedAustin 11:cada08fc8a70 72 unsigned int keylen )
mbedAustin 11:cada08fc8a70 73 {
mbedAustin 11:cada08fc8a70 74 int i, j, a;
mbedAustin 11:cada08fc8a70 75 unsigned int k;
mbedAustin 11:cada08fc8a70 76 unsigned char *m;
mbedAustin 11:cada08fc8a70 77
mbedAustin 11:cada08fc8a70 78 ctx->x = 0;
mbedAustin 11:cada08fc8a70 79 ctx->y = 0;
mbedAustin 11:cada08fc8a70 80 m = ctx->m;
mbedAustin 11:cada08fc8a70 81
mbedAustin 11:cada08fc8a70 82 for( i = 0; i < 256; i++ )
mbedAustin 11:cada08fc8a70 83 m[i] = (unsigned char) i;
mbedAustin 11:cada08fc8a70 84
mbedAustin 11:cada08fc8a70 85 j = k = 0;
mbedAustin 11:cada08fc8a70 86
mbedAustin 11:cada08fc8a70 87 for( i = 0; i < 256; i++, k++ )
mbedAustin 11:cada08fc8a70 88 {
mbedAustin 11:cada08fc8a70 89 if( k >= keylen ) k = 0;
mbedAustin 11:cada08fc8a70 90
mbedAustin 11:cada08fc8a70 91 a = m[i];
mbedAustin 11:cada08fc8a70 92 j = ( j + a + key[k] ) & 0xFF;
mbedAustin 11:cada08fc8a70 93 m[i] = m[j];
mbedAustin 11:cada08fc8a70 94 m[j] = (unsigned char) a;
mbedAustin 11:cada08fc8a70 95 }
mbedAustin 11:cada08fc8a70 96 }
mbedAustin 11:cada08fc8a70 97
mbedAustin 11:cada08fc8a70 98 /*
mbedAustin 11:cada08fc8a70 99 * ARC4 cipher function
mbedAustin 11:cada08fc8a70 100 */
mbedAustin 11:cada08fc8a70 101 int mbedtls_arc4_crypt( mbedtls_arc4_context *ctx, size_t length, const unsigned char *input,
mbedAustin 11:cada08fc8a70 102 unsigned char *output )
mbedAustin 11:cada08fc8a70 103 {
mbedAustin 11:cada08fc8a70 104 int x, y, a, b;
mbedAustin 11:cada08fc8a70 105 size_t i;
mbedAustin 11:cada08fc8a70 106 unsigned char *m;
mbedAustin 11:cada08fc8a70 107
mbedAustin 11:cada08fc8a70 108 x = ctx->x;
mbedAustin 11:cada08fc8a70 109 y = ctx->y;
mbedAustin 11:cada08fc8a70 110 m = ctx->m;
mbedAustin 11:cada08fc8a70 111
mbedAustin 11:cada08fc8a70 112 for( i = 0; i < length; i++ )
mbedAustin 11:cada08fc8a70 113 {
mbedAustin 11:cada08fc8a70 114 x = ( x + 1 ) & 0xFF; a = m[x];
mbedAustin 11:cada08fc8a70 115 y = ( y + a ) & 0xFF; b = m[y];
mbedAustin 11:cada08fc8a70 116
mbedAustin 11:cada08fc8a70 117 m[x] = (unsigned char) b;
mbedAustin 11:cada08fc8a70 118 m[y] = (unsigned char) a;
mbedAustin 11:cada08fc8a70 119
mbedAustin 11:cada08fc8a70 120 output[i] = (unsigned char)
mbedAustin 11:cada08fc8a70 121 ( input[i] ^ m[(unsigned char)( a + b )] );
mbedAustin 11:cada08fc8a70 122 }
mbedAustin 11:cada08fc8a70 123
mbedAustin 11:cada08fc8a70 124 ctx->x = x;
mbedAustin 11:cada08fc8a70 125 ctx->y = y;
mbedAustin 11:cada08fc8a70 126
mbedAustin 11:cada08fc8a70 127 return( 0 );
mbedAustin 11:cada08fc8a70 128 }
mbedAustin 11:cada08fc8a70 129
mbedAustin 11:cada08fc8a70 130 #endif /* !MBEDTLS_ARC4_ALT */
mbedAustin 11:cada08fc8a70 131
mbedAustin 11:cada08fc8a70 132 #if defined(MBEDTLS_SELF_TEST)
mbedAustin 11:cada08fc8a70 133 /*
mbedAustin 11:cada08fc8a70 134 * ARC4 tests vectors as posted by Eric Rescorla in sep. 1994:
mbedAustin 11:cada08fc8a70 135 *
mbedAustin 11:cada08fc8a70 136 * http://groups.google.com/group/comp.security.misc/msg/10a300c9d21afca0
mbedAustin 11:cada08fc8a70 137 */
mbedAustin 11:cada08fc8a70 138 static const unsigned char arc4_test_key[3][8] =
mbedAustin 11:cada08fc8a70 139 {
mbedAustin 11:cada08fc8a70 140 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
mbedAustin 11:cada08fc8a70 141 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
mbedAustin 11:cada08fc8a70 142 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
mbedAustin 11:cada08fc8a70 143 };
mbedAustin 11:cada08fc8a70 144
mbedAustin 11:cada08fc8a70 145 static const unsigned char arc4_test_pt[3][8] =
mbedAustin 11:cada08fc8a70 146 {
mbedAustin 11:cada08fc8a70 147 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
mbedAustin 11:cada08fc8a70 148 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
mbedAustin 11:cada08fc8a70 149 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
mbedAustin 11:cada08fc8a70 150 };
mbedAustin 11:cada08fc8a70 151
mbedAustin 11:cada08fc8a70 152 static const unsigned char arc4_test_ct[3][8] =
mbedAustin 11:cada08fc8a70 153 {
mbedAustin 11:cada08fc8a70 154 { 0x75, 0xB7, 0x87, 0x80, 0x99, 0xE0, 0xC5, 0x96 },
mbedAustin 11:cada08fc8a70 155 { 0x74, 0x94, 0xC2, 0xE7, 0x10, 0x4B, 0x08, 0x79 },
mbedAustin 11:cada08fc8a70 156 { 0xDE, 0x18, 0x89, 0x41, 0xA3, 0x37, 0x5D, 0x3A }
mbedAustin 11:cada08fc8a70 157 };
mbedAustin 11:cada08fc8a70 158
mbedAustin 11:cada08fc8a70 159 /*
mbedAustin 11:cada08fc8a70 160 * Checkup routine
mbedAustin 11:cada08fc8a70 161 */
mbedAustin 11:cada08fc8a70 162 int mbedtls_arc4_self_test( int verbose )
mbedAustin 11:cada08fc8a70 163 {
mbedAustin 11:cada08fc8a70 164 int i, ret = 0;
mbedAustin 11:cada08fc8a70 165 unsigned char ibuf[8];
mbedAustin 11:cada08fc8a70 166 unsigned char obuf[8];
mbedAustin 11:cada08fc8a70 167 mbedtls_arc4_context ctx;
mbedAustin 11:cada08fc8a70 168
mbedAustin 11:cada08fc8a70 169 mbedtls_arc4_init( &ctx );
mbedAustin 11:cada08fc8a70 170
mbedAustin 11:cada08fc8a70 171 for( i = 0; i < 3; i++ )
mbedAustin 11:cada08fc8a70 172 {
mbedAustin 11:cada08fc8a70 173 if( verbose != 0 )
mbedAustin 11:cada08fc8a70 174 mbedtls_printf( " ARC4 test #%d: ", i + 1 );
mbedAustin 11:cada08fc8a70 175
mbedAustin 11:cada08fc8a70 176 memcpy( ibuf, arc4_test_pt[i], 8 );
mbedAustin 11:cada08fc8a70 177
mbedAustin 11:cada08fc8a70 178 mbedtls_arc4_setup( &ctx, arc4_test_key[i], 8 );
mbedAustin 11:cada08fc8a70 179 mbedtls_arc4_crypt( &ctx, 8, ibuf, obuf );
mbedAustin 11:cada08fc8a70 180
mbedAustin 11:cada08fc8a70 181 if( memcmp( obuf, arc4_test_ct[i], 8 ) != 0 )
mbedAustin 11:cada08fc8a70 182 {
mbedAustin 11:cada08fc8a70 183 if( verbose != 0 )
mbedAustin 11:cada08fc8a70 184 mbedtls_printf( "failed\n" );
mbedAustin 11:cada08fc8a70 185
mbedAustin 11:cada08fc8a70 186 ret = 1;
mbedAustin 11:cada08fc8a70 187 goto exit;
mbedAustin 11:cada08fc8a70 188 }
mbedAustin 11:cada08fc8a70 189
mbedAustin 11:cada08fc8a70 190 if( verbose != 0 )
mbedAustin 11:cada08fc8a70 191 mbedtls_printf( "passed\n" );
mbedAustin 11:cada08fc8a70 192 }
mbedAustin 11:cada08fc8a70 193
mbedAustin 11:cada08fc8a70 194 if( verbose != 0 )
mbedAustin 11:cada08fc8a70 195 mbedtls_printf( "\n" );
mbedAustin 11:cada08fc8a70 196
mbedAustin 11:cada08fc8a70 197 exit:
mbedAustin 11:cada08fc8a70 198 mbedtls_arc4_free( &ctx );
mbedAustin 11:cada08fc8a70 199
mbedAustin 11:cada08fc8a70 200 return( ret );
mbedAustin 11:cada08fc8a70 201 }
mbedAustin 11:cada08fc8a70 202
mbedAustin 11:cada08fc8a70 203 #endif /* MBEDTLS_SELF_TEST */
mbedAustin 11:cada08fc8a70 204
mbedAustin 11:cada08fc8a70 205 #endif /* MBEDTLS_ARC4_C */