Kenji Arai / mbed-os_TYBLE16

mbed-os5 only for TYBLE16

Dependents:   TYBLE16_simple_data_logger TYBLE16_MP3_Air

features/mbedtls/mbed-crypto/src/arc4.c@0:5b88d5760320, 2019-12-17 (annotated)

Committer:
kenjiArai
Date:
Tue Dec 17 23:23:45 2019 +0000
Revision:
0:5b88d5760320
mbed-os5 only for TYBLE16

Who changed what in which revision?

UserRevisionLine numberNew contents of line
kenjiArai 0:5b88d5760320 1 /*
kenjiArai 0:5b88d5760320 2 * An implementation of the ARCFOUR algorithm
kenjiArai 0:5b88d5760320 3 *
kenjiArai 0:5b88d5760320 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
kenjiArai 0:5b88d5760320 5 * SPDX-License-Identifier: Apache-2.0
kenjiArai 0:5b88d5760320 6 *
kenjiArai 0:5b88d5760320 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
kenjiArai 0:5b88d5760320 8 * not use this file except in compliance with the License.
kenjiArai 0:5b88d5760320 9 * You may obtain a copy of the License at
kenjiArai 0:5b88d5760320 10 *
kenjiArai 0:5b88d5760320 11 * http://www.apache.org/licenses/LICENSE-2.0
kenjiArai 0:5b88d5760320 12 *
kenjiArai 0:5b88d5760320 13 * Unless required by applicable law or agreed to in writing, software
kenjiArai 0:5b88d5760320 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
kenjiArai 0:5b88d5760320 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
kenjiArai 0:5b88d5760320 16 * See the License for the specific language governing permissions and
kenjiArai 0:5b88d5760320 17 * limitations under the License.
kenjiArai 0:5b88d5760320 18 *
kenjiArai 0:5b88d5760320 19 * This file is part of mbed TLS (https://tls.mbed.org)
kenjiArai 0:5b88d5760320 20 */
kenjiArai 0:5b88d5760320 21 /*
kenjiArai 0:5b88d5760320 22 * The ARCFOUR algorithm was publicly disclosed on 94/09.
kenjiArai 0:5b88d5760320 23 *
kenjiArai 0:5b88d5760320 24 * http://groups.google.com/group/sci.crypt/msg/10a300c9d21afca0
kenjiArai 0:5b88d5760320 25 */
kenjiArai 0:5b88d5760320 26
kenjiArai 0:5b88d5760320 27 #if !defined(MBEDTLS_CONFIG_FILE)
kenjiArai 0:5b88d5760320 28 #include "mbedtls/config.h"
kenjiArai 0:5b88d5760320 29 #else
kenjiArai 0:5b88d5760320 30 #include MBEDTLS_CONFIG_FILE
kenjiArai 0:5b88d5760320 31 #endif
kenjiArai 0:5b88d5760320 32
kenjiArai 0:5b88d5760320 33 #if defined(MBEDTLS_ARC4_C)
kenjiArai 0:5b88d5760320 34
kenjiArai 0:5b88d5760320 35 #include "mbedtls/arc4.h"
kenjiArai 0:5b88d5760320 36 #include "mbedtls/platform_util.h"
kenjiArai 0:5b88d5760320 37
kenjiArai 0:5b88d5760320 38 #include <string.h>
kenjiArai 0:5b88d5760320 39
kenjiArai 0:5b88d5760320 40 #if defined(MBEDTLS_SELF_TEST)
kenjiArai 0:5b88d5760320 41 #if defined(MBEDTLS_PLATFORM_C)
kenjiArai 0:5b88d5760320 42 #include "mbedtls/platform.h"
kenjiArai 0:5b88d5760320 43 #else
kenjiArai 0:5b88d5760320 44 #include <stdio.h>
kenjiArai 0:5b88d5760320 45 #define mbedtls_printf printf
kenjiArai 0:5b88d5760320 46 #endif /* MBEDTLS_PLATFORM_C */
kenjiArai 0:5b88d5760320 47 #endif /* MBEDTLS_SELF_TEST */
kenjiArai 0:5b88d5760320 48
kenjiArai 0:5b88d5760320 49 #if !defined(MBEDTLS_ARC4_ALT)
kenjiArai 0:5b88d5760320 50
kenjiArai 0:5b88d5760320 51 void mbedtls_arc4_init( mbedtls_arc4_context *ctx )
kenjiArai 0:5b88d5760320 52 {
kenjiArai 0:5b88d5760320 53 memset( ctx, 0, sizeof( mbedtls_arc4_context ) );
kenjiArai 0:5b88d5760320 54 }
kenjiArai 0:5b88d5760320 55
kenjiArai 0:5b88d5760320 56 void mbedtls_arc4_free( mbedtls_arc4_context *ctx )
kenjiArai 0:5b88d5760320 57 {
kenjiArai 0:5b88d5760320 58 if( ctx == NULL )
kenjiArai 0:5b88d5760320 59 return;
kenjiArai 0:5b88d5760320 60
kenjiArai 0:5b88d5760320 61 mbedtls_platform_zeroize( ctx, sizeof( mbedtls_arc4_context ) );
kenjiArai 0:5b88d5760320 62 }
kenjiArai 0:5b88d5760320 63
kenjiArai 0:5b88d5760320 64 /*
kenjiArai 0:5b88d5760320 65 * ARC4 key schedule
kenjiArai 0:5b88d5760320 66 */
kenjiArai 0:5b88d5760320 67 void mbedtls_arc4_setup( mbedtls_arc4_context *ctx, const unsigned char *key,
kenjiArai 0:5b88d5760320 68 unsigned int keylen )
kenjiArai 0:5b88d5760320 69 {
kenjiArai 0:5b88d5760320 70 int i, j, a;
kenjiArai 0:5b88d5760320 71 unsigned int k;
kenjiArai 0:5b88d5760320 72 unsigned char *m;
kenjiArai 0:5b88d5760320 73
kenjiArai 0:5b88d5760320 74 ctx->x = 0;
kenjiArai 0:5b88d5760320 75 ctx->y = 0;
kenjiArai 0:5b88d5760320 76 m = ctx->m;
kenjiArai 0:5b88d5760320 77
kenjiArai 0:5b88d5760320 78 for( i = 0; i < 256; i++ )
kenjiArai 0:5b88d5760320 79 m[i] = (unsigned char) i;
kenjiArai 0:5b88d5760320 80
kenjiArai 0:5b88d5760320 81 j = k = 0;
kenjiArai 0:5b88d5760320 82
kenjiArai 0:5b88d5760320 83 for( i = 0; i < 256; i++, k++ )
kenjiArai 0:5b88d5760320 84 {
kenjiArai 0:5b88d5760320 85 if( k >= keylen ) k = 0;
kenjiArai 0:5b88d5760320 86
kenjiArai 0:5b88d5760320 87 a = m[i];
kenjiArai 0:5b88d5760320 88 j = ( j + a + key[k] ) & 0xFF;
kenjiArai 0:5b88d5760320 89 m[i] = m[j];
kenjiArai 0:5b88d5760320 90 m[j] = (unsigned char) a;
kenjiArai 0:5b88d5760320 91 }
kenjiArai 0:5b88d5760320 92 }
kenjiArai 0:5b88d5760320 93
kenjiArai 0:5b88d5760320 94 /*
kenjiArai 0:5b88d5760320 95 * ARC4 cipher function
kenjiArai 0:5b88d5760320 96 */
kenjiArai 0:5b88d5760320 97 int mbedtls_arc4_crypt( mbedtls_arc4_context *ctx, size_t length, const unsigned char *input,
kenjiArai 0:5b88d5760320 98 unsigned char *output )
kenjiArai 0:5b88d5760320 99 {
kenjiArai 0:5b88d5760320 100 int x, y, a, b;
kenjiArai 0:5b88d5760320 101 size_t i;
kenjiArai 0:5b88d5760320 102 unsigned char *m;
kenjiArai 0:5b88d5760320 103
kenjiArai 0:5b88d5760320 104 x = ctx->x;
kenjiArai 0:5b88d5760320 105 y = ctx->y;
kenjiArai 0:5b88d5760320 106 m = ctx->m;
kenjiArai 0:5b88d5760320 107
kenjiArai 0:5b88d5760320 108 for( i = 0; i < length; i++ )
kenjiArai 0:5b88d5760320 109 {
kenjiArai 0:5b88d5760320 110 x = ( x + 1 ) & 0xFF; a = m[x];
kenjiArai 0:5b88d5760320 111 y = ( y + a ) & 0xFF; b = m[y];
kenjiArai 0:5b88d5760320 112
kenjiArai 0:5b88d5760320 113 m[x] = (unsigned char) b;
kenjiArai 0:5b88d5760320 114 m[y] = (unsigned char) a;
kenjiArai 0:5b88d5760320 115
kenjiArai 0:5b88d5760320 116 output[i] = (unsigned char)
kenjiArai 0:5b88d5760320 117 ( input[i] ^ m[(unsigned char)( a + b )] );
kenjiArai 0:5b88d5760320 118 }
kenjiArai 0:5b88d5760320 119
kenjiArai 0:5b88d5760320 120 ctx->x = x;
kenjiArai 0:5b88d5760320 121 ctx->y = y;
kenjiArai 0:5b88d5760320 122
kenjiArai 0:5b88d5760320 123 return( 0 );
kenjiArai 0:5b88d5760320 124 }
kenjiArai 0:5b88d5760320 125
kenjiArai 0:5b88d5760320 126 #endif /* !MBEDTLS_ARC4_ALT */
kenjiArai 0:5b88d5760320 127
kenjiArai 0:5b88d5760320 128 #if defined(MBEDTLS_SELF_TEST)
kenjiArai 0:5b88d5760320 129 /*
kenjiArai 0:5b88d5760320 130 * ARC4 tests vectors as posted by Eric Rescorla in sep. 1994:
kenjiArai 0:5b88d5760320 131 *
kenjiArai 0:5b88d5760320 132 * http://groups.google.com/group/comp.security.misc/msg/10a300c9d21afca0
kenjiArai 0:5b88d5760320 133 */
kenjiArai 0:5b88d5760320 134 static const unsigned char arc4_test_key[3][8] =
kenjiArai 0:5b88d5760320 135 {
kenjiArai 0:5b88d5760320 136 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
kenjiArai 0:5b88d5760320 137 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
kenjiArai 0:5b88d5760320 138 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
kenjiArai 0:5b88d5760320 139 };
kenjiArai 0:5b88d5760320 140
kenjiArai 0:5b88d5760320 141 static const unsigned char arc4_test_pt[3][8] =
kenjiArai 0:5b88d5760320 142 {
kenjiArai 0:5b88d5760320 143 { 0x01, 0x23, 0x45, 0x67, 0x89, 0xAB, 0xCD, 0xEF },
kenjiArai 0:5b88d5760320 144 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 },
kenjiArai 0:5b88d5760320 145 { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }
kenjiArai 0:5b88d5760320 146 };
kenjiArai 0:5b88d5760320 147
kenjiArai 0:5b88d5760320 148 static const unsigned char arc4_test_ct[3][8] =
kenjiArai 0:5b88d5760320 149 {
kenjiArai 0:5b88d5760320 150 { 0x75, 0xB7, 0x87, 0x80, 0x99, 0xE0, 0xC5, 0x96 },
kenjiArai 0:5b88d5760320 151 { 0x74, 0x94, 0xC2, 0xE7, 0x10, 0x4B, 0x08, 0x79 },
kenjiArai 0:5b88d5760320 152 { 0xDE, 0x18, 0x89, 0x41, 0xA3, 0x37, 0x5D, 0x3A }
kenjiArai 0:5b88d5760320 153 };
kenjiArai 0:5b88d5760320 154
kenjiArai 0:5b88d5760320 155 /*
kenjiArai 0:5b88d5760320 156 * Checkup routine
kenjiArai 0:5b88d5760320 157 */
kenjiArai 0:5b88d5760320 158 int mbedtls_arc4_self_test( int verbose )
kenjiArai 0:5b88d5760320 159 {
kenjiArai 0:5b88d5760320 160 int i, ret = 0;
kenjiArai 0:5b88d5760320 161 unsigned char ibuf[8];
kenjiArai 0:5b88d5760320 162 unsigned char obuf[8];
kenjiArai 0:5b88d5760320 163 mbedtls_arc4_context ctx;
kenjiArai 0:5b88d5760320 164
kenjiArai 0:5b88d5760320 165 mbedtls_arc4_init( &ctx );
kenjiArai 0:5b88d5760320 166
kenjiArai 0:5b88d5760320 167 for( i = 0; i < 3; i++ )
kenjiArai 0:5b88d5760320 168 {
kenjiArai 0:5b88d5760320 169 if( verbose != 0 )
kenjiArai 0:5b88d5760320 170 mbedtls_printf( " ARC4 test #%d: ", i + 1 );
kenjiArai 0:5b88d5760320 171
kenjiArai 0:5b88d5760320 172 memcpy( ibuf, arc4_test_pt[i], 8 );
kenjiArai 0:5b88d5760320 173
kenjiArai 0:5b88d5760320 174 mbedtls_arc4_setup( &ctx, arc4_test_key[i], 8 );
kenjiArai 0:5b88d5760320 175 mbedtls_arc4_crypt( &ctx, 8, ibuf, obuf );
kenjiArai 0:5b88d5760320 176
kenjiArai 0:5b88d5760320 177 if( memcmp( obuf, arc4_test_ct[i], 8 ) != 0 )
kenjiArai 0:5b88d5760320 178 {
kenjiArai 0:5b88d5760320 179 if( verbose != 0 )
kenjiArai 0:5b88d5760320 180 mbedtls_printf( "failed\n" );
kenjiArai 0:5b88d5760320 181
kenjiArai 0:5b88d5760320 182 ret = 1;
kenjiArai 0:5b88d5760320 183 goto exit;
kenjiArai 0:5b88d5760320 184 }
kenjiArai 0:5b88d5760320 185
kenjiArai 0:5b88d5760320 186 if( verbose != 0 )
kenjiArai 0:5b88d5760320 187 mbedtls_printf( "passed\n" );
kenjiArai 0:5b88d5760320 188 }
kenjiArai 0:5b88d5760320 189
kenjiArai 0:5b88d5760320 190 if( verbose != 0 )
kenjiArai 0:5b88d5760320 191 mbedtls_printf( "\n" );
kenjiArai 0:5b88d5760320 192
kenjiArai 0:5b88d5760320 193 exit:
kenjiArai 0:5b88d5760320 194 mbedtls_arc4_free( &ctx );
kenjiArai 0:5b88d5760320 195
kenjiArai 0:5b88d5760320 196 return( ret );
kenjiArai 0:5b88d5760320 197 }
kenjiArai 0:5b88d5760320 198
kenjiArai 0:5b88d5760320 199 #endif /* MBEDTLS_SELF_TEST */
kenjiArai 0:5b88d5760320 200
kenjiArai 0:5b88d5760320 201 #endif /* MBEDTLS_ARC4_C */