Magnificent7 / Hackathon

Includes library modifications to allow access to AIN_4 (AIN_0 / 5)

mbd_os/features/mbedtls/src/base64.c@0:eafc3fd41f75, 2016-09-20 (annotated)

Committer:
bryantaylor
Date:
Tue Sep 20 21:26:12 2016 +0000
Revision:
0:eafc3fd41f75
hackathon

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bryantaylor 0:eafc3fd41f75 1 /*
bryantaylor 0:eafc3fd41f75 2 * RFC 1521 base64 encoding/decoding
bryantaylor 0:eafc3fd41f75 3 *
bryantaylor 0:eafc3fd41f75 4 * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
bryantaylor 0:eafc3fd41f75 5 * SPDX-License-Identifier: Apache-2.0
bryantaylor 0:eafc3fd41f75 6 *
bryantaylor 0:eafc3fd41f75 7 * Licensed under the Apache License, Version 2.0 (the "License"); you may
bryantaylor 0:eafc3fd41f75 8 * not use this file except in compliance with the License.
bryantaylor 0:eafc3fd41f75 9 * You may obtain a copy of the License at
bryantaylor 0:eafc3fd41f75 10 *
bryantaylor 0:eafc3fd41f75 11 * http://www.apache.org/licenses/LICENSE-2.0
bryantaylor 0:eafc3fd41f75 12 *
bryantaylor 0:eafc3fd41f75 13 * Unless required by applicable law or agreed to in writing, software
bryantaylor 0:eafc3fd41f75 14 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
bryantaylor 0:eafc3fd41f75 15 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bryantaylor 0:eafc3fd41f75 16 * See the License for the specific language governing permissions and
bryantaylor 0:eafc3fd41f75 17 * limitations under the License.
bryantaylor 0:eafc3fd41f75 18 *
bryantaylor 0:eafc3fd41f75 19 * This file is part of mbed TLS (https://tls.mbed.org)
bryantaylor 0:eafc3fd41f75 20 */
bryantaylor 0:eafc3fd41f75 21
bryantaylor 0:eafc3fd41f75 22 #if !defined(MBEDTLS_CONFIG_FILE)
bryantaylor 0:eafc3fd41f75 23 #include "mbedtls/config.h"
bryantaylor 0:eafc3fd41f75 24 #else
bryantaylor 0:eafc3fd41f75 25 #include MBEDTLS_CONFIG_FILE
bryantaylor 0:eafc3fd41f75 26 #endif
bryantaylor 0:eafc3fd41f75 27
bryantaylor 0:eafc3fd41f75 28 #if defined(MBEDTLS_BASE64_C)
bryantaylor 0:eafc3fd41f75 29
bryantaylor 0:eafc3fd41f75 30 #include "mbedtls/base64.h"
bryantaylor 0:eafc3fd41f75 31
bryantaylor 0:eafc3fd41f75 32 #include <stdint.h>
bryantaylor 0:eafc3fd41f75 33
bryantaylor 0:eafc3fd41f75 34 #if defined(MBEDTLS_SELF_TEST)
bryantaylor 0:eafc3fd41f75 35 #include <string.h>
bryantaylor 0:eafc3fd41f75 36 #if defined(MBEDTLS_PLATFORM_C)
bryantaylor 0:eafc3fd41f75 37 #include "mbedtls/platform.h"
bryantaylor 0:eafc3fd41f75 38 #else
bryantaylor 0:eafc3fd41f75 39 #include <stdio.h>
bryantaylor 0:eafc3fd41f75 40 #define mbedtls_printf printf
bryantaylor 0:eafc3fd41f75 41 #endif /* MBEDTLS_PLATFORM_C */
bryantaylor 0:eafc3fd41f75 42 #endif /* MBEDTLS_SELF_TEST */
bryantaylor 0:eafc3fd41f75 43
bryantaylor 0:eafc3fd41f75 44 static const unsigned char base64_enc_map[64] =
bryantaylor 0:eafc3fd41f75 45 {
bryantaylor 0:eafc3fd41f75 46 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J',
bryantaylor 0:eafc3fd41f75 47 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T',
bryantaylor 0:eafc3fd41f75 48 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd',
bryantaylor 0:eafc3fd41f75 49 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
bryantaylor 0:eafc3fd41f75 50 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x',
bryantaylor 0:eafc3fd41f75 51 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7',
bryantaylor 0:eafc3fd41f75 52 '8', '9', '+', '/'
bryantaylor 0:eafc3fd41f75 53 };
bryantaylor 0:eafc3fd41f75 54
bryantaylor 0:eafc3fd41f75 55 static const unsigned char base64_dec_map[128] =
bryantaylor 0:eafc3fd41f75 56 {
bryantaylor 0:eafc3fd41f75 57 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
bryantaylor 0:eafc3fd41f75 58 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
bryantaylor 0:eafc3fd41f75 59 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
bryantaylor 0:eafc3fd41f75 60 127, 127, 127, 127, 127, 127, 127, 127, 127, 127,
bryantaylor 0:eafc3fd41f75 61 127, 127, 127, 62, 127, 127, 127, 63, 52, 53,
bryantaylor 0:eafc3fd41f75 62 54, 55, 56, 57, 58, 59, 60, 61, 127, 127,
bryantaylor 0:eafc3fd41f75 63 127, 64, 127, 127, 127, 0, 1, 2, 3, 4,
bryantaylor 0:eafc3fd41f75 64 5, 6, 7, 8, 9, 10, 11, 12, 13, 14,
bryantaylor 0:eafc3fd41f75 65 15, 16, 17, 18, 19, 20, 21, 22, 23, 24,
bryantaylor 0:eafc3fd41f75 66 25, 127, 127, 127, 127, 127, 127, 26, 27, 28,
bryantaylor 0:eafc3fd41f75 67 29, 30, 31, 32, 33, 34, 35, 36, 37, 38,
bryantaylor 0:eafc3fd41f75 68 39, 40, 41, 42, 43, 44, 45, 46, 47, 48,
bryantaylor 0:eafc3fd41f75 69 49, 50, 51, 127, 127, 127, 127, 127
bryantaylor 0:eafc3fd41f75 70 };
bryantaylor 0:eafc3fd41f75 71
bryantaylor 0:eafc3fd41f75 72 #define BASE64_SIZE_T_MAX ( (size_t) -1 ) /* SIZE_T_MAX is not standard */
bryantaylor 0:eafc3fd41f75 73
bryantaylor 0:eafc3fd41f75 74 /*
bryantaylor 0:eafc3fd41f75 75 * Encode a buffer into base64 format
bryantaylor 0:eafc3fd41f75 76 */
bryantaylor 0:eafc3fd41f75 77 int mbedtls_base64_encode( unsigned char *dst, size_t dlen, size_t *olen,
bryantaylor 0:eafc3fd41f75 78 const unsigned char *src, size_t slen )
bryantaylor 0:eafc3fd41f75 79 {
bryantaylor 0:eafc3fd41f75 80 size_t i, n;
bryantaylor 0:eafc3fd41f75 81 int C1, C2, C3;
bryantaylor 0:eafc3fd41f75 82 unsigned char *p;
bryantaylor 0:eafc3fd41f75 83
bryantaylor 0:eafc3fd41f75 84 if( slen == 0 )
bryantaylor 0:eafc3fd41f75 85 {
bryantaylor 0:eafc3fd41f75 86 *olen = 0;
bryantaylor 0:eafc3fd41f75 87 return( 0 );
bryantaylor 0:eafc3fd41f75 88 }
bryantaylor 0:eafc3fd41f75 89
bryantaylor 0:eafc3fd41f75 90 n = slen / 3 + ( slen % 3 != 0 );
bryantaylor 0:eafc3fd41f75 91
bryantaylor 0:eafc3fd41f75 92 if( n > ( BASE64_SIZE_T_MAX - 1 ) / 4 )
bryantaylor 0:eafc3fd41f75 93 {
bryantaylor 0:eafc3fd41f75 94 *olen = BASE64_SIZE_T_MAX;
bryantaylor 0:eafc3fd41f75 95 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
bryantaylor 0:eafc3fd41f75 96 }
bryantaylor 0:eafc3fd41f75 97
bryantaylor 0:eafc3fd41f75 98 n *= 4;
bryantaylor 0:eafc3fd41f75 99
bryantaylor 0:eafc3fd41f75 100 if( ( dlen < n + 1 ) || ( NULL == dst ) )
bryantaylor 0:eafc3fd41f75 101 {
bryantaylor 0:eafc3fd41f75 102 *olen = n + 1;
bryantaylor 0:eafc3fd41f75 103 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
bryantaylor 0:eafc3fd41f75 104 }
bryantaylor 0:eafc3fd41f75 105
bryantaylor 0:eafc3fd41f75 106 n = ( slen / 3 ) * 3;
bryantaylor 0:eafc3fd41f75 107
bryantaylor 0:eafc3fd41f75 108 for( i = 0, p = dst; i < n; i += 3 )
bryantaylor 0:eafc3fd41f75 109 {
bryantaylor 0:eafc3fd41f75 110 C1 = *src++;
bryantaylor 0:eafc3fd41f75 111 C2 = *src++;
bryantaylor 0:eafc3fd41f75 112 C3 = *src++;
bryantaylor 0:eafc3fd41f75 113
bryantaylor 0:eafc3fd41f75 114 *p++ = base64_enc_map[(C1 >> 2) & 0x3F];
bryantaylor 0:eafc3fd41f75 115 *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F];
bryantaylor 0:eafc3fd41f75 116 *p++ = base64_enc_map[(((C2 & 15) << 2) + (C3 >> 6)) & 0x3F];
bryantaylor 0:eafc3fd41f75 117 *p++ = base64_enc_map[C3 & 0x3F];
bryantaylor 0:eafc3fd41f75 118 }
bryantaylor 0:eafc3fd41f75 119
bryantaylor 0:eafc3fd41f75 120 if( i < slen )
bryantaylor 0:eafc3fd41f75 121 {
bryantaylor 0:eafc3fd41f75 122 C1 = *src++;
bryantaylor 0:eafc3fd41f75 123 C2 = ( ( i + 1 ) < slen ) ? *src++ : 0;
bryantaylor 0:eafc3fd41f75 124
bryantaylor 0:eafc3fd41f75 125 *p++ = base64_enc_map[(C1 >> 2) & 0x3F];
bryantaylor 0:eafc3fd41f75 126 *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F];
bryantaylor 0:eafc3fd41f75 127
bryantaylor 0:eafc3fd41f75 128 if( ( i + 1 ) < slen )
bryantaylor 0:eafc3fd41f75 129 *p++ = base64_enc_map[((C2 & 15) << 2) & 0x3F];
bryantaylor 0:eafc3fd41f75 130 else *p++ = '=';
bryantaylor 0:eafc3fd41f75 131
bryantaylor 0:eafc3fd41f75 132 *p++ = '=';
bryantaylor 0:eafc3fd41f75 133 }
bryantaylor 0:eafc3fd41f75 134
bryantaylor 0:eafc3fd41f75 135 *olen = p - dst;
bryantaylor 0:eafc3fd41f75 136 *p = 0;
bryantaylor 0:eafc3fd41f75 137
bryantaylor 0:eafc3fd41f75 138 return( 0 );
bryantaylor 0:eafc3fd41f75 139 }
bryantaylor 0:eafc3fd41f75 140
bryantaylor 0:eafc3fd41f75 141 /*
bryantaylor 0:eafc3fd41f75 142 * Decode a base64-formatted buffer
bryantaylor 0:eafc3fd41f75 143 */
bryantaylor 0:eafc3fd41f75 144 int mbedtls_base64_decode( unsigned char *dst, size_t dlen, size_t *olen,
bryantaylor 0:eafc3fd41f75 145 const unsigned char *src, size_t slen )
bryantaylor 0:eafc3fd41f75 146 {
bryantaylor 0:eafc3fd41f75 147 size_t i, n;
bryantaylor 0:eafc3fd41f75 148 uint32_t j, x;
bryantaylor 0:eafc3fd41f75 149 unsigned char *p;
bryantaylor 0:eafc3fd41f75 150
bryantaylor 0:eafc3fd41f75 151 /* First pass: check for validity and get output length */
bryantaylor 0:eafc3fd41f75 152 for( i = n = j = 0; i < slen; i++ )
bryantaylor 0:eafc3fd41f75 153 {
bryantaylor 0:eafc3fd41f75 154 /* Skip spaces before checking for EOL */
bryantaylor 0:eafc3fd41f75 155 x = 0;
bryantaylor 0:eafc3fd41f75 156 while( i < slen && src[i] == ' ' )
bryantaylor 0:eafc3fd41f75 157 {
bryantaylor 0:eafc3fd41f75 158 ++i;
bryantaylor 0:eafc3fd41f75 159 ++x;
bryantaylor 0:eafc3fd41f75 160 }
bryantaylor 0:eafc3fd41f75 161
bryantaylor 0:eafc3fd41f75 162 /* Spaces at end of buffer are OK */
bryantaylor 0:eafc3fd41f75 163 if( i == slen )
bryantaylor 0:eafc3fd41f75 164 break;
bryantaylor 0:eafc3fd41f75 165
bryantaylor 0:eafc3fd41f75 166 if( ( slen - i ) >= 2 &&
bryantaylor 0:eafc3fd41f75 167 src[i] == '\r' && src[i + 1] == '\n' )
bryantaylor 0:eafc3fd41f75 168 continue;
bryantaylor 0:eafc3fd41f75 169
bryantaylor 0:eafc3fd41f75 170 if( src[i] == '\n' )
bryantaylor 0:eafc3fd41f75 171 continue;
bryantaylor 0:eafc3fd41f75 172
bryantaylor 0:eafc3fd41f75 173 /* Space inside a line is an error */
bryantaylor 0:eafc3fd41f75 174 if( x != 0 )
bryantaylor 0:eafc3fd41f75 175 return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
bryantaylor 0:eafc3fd41f75 176
bryantaylor 0:eafc3fd41f75 177 if( src[i] == '=' && ++j > 2 )
bryantaylor 0:eafc3fd41f75 178 return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
bryantaylor 0:eafc3fd41f75 179
bryantaylor 0:eafc3fd41f75 180 if( src[i] > 127 || base64_dec_map[src[i]] == 127 )
bryantaylor 0:eafc3fd41f75 181 return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
bryantaylor 0:eafc3fd41f75 182
bryantaylor 0:eafc3fd41f75 183 if( base64_dec_map[src[i]] < 64 && j != 0 )
bryantaylor 0:eafc3fd41f75 184 return( MBEDTLS_ERR_BASE64_INVALID_CHARACTER );
bryantaylor 0:eafc3fd41f75 185
bryantaylor 0:eafc3fd41f75 186 n++;
bryantaylor 0:eafc3fd41f75 187 }
bryantaylor 0:eafc3fd41f75 188
bryantaylor 0:eafc3fd41f75 189 if( n == 0 )
bryantaylor 0:eafc3fd41f75 190 {
bryantaylor 0:eafc3fd41f75 191 *olen = 0;
bryantaylor 0:eafc3fd41f75 192 return( 0 );
bryantaylor 0:eafc3fd41f75 193 }
bryantaylor 0:eafc3fd41f75 194
bryantaylor 0:eafc3fd41f75 195 n = ( ( n * 6 ) + 7 ) >> 3;
bryantaylor 0:eafc3fd41f75 196 n -= j;
bryantaylor 0:eafc3fd41f75 197
bryantaylor 0:eafc3fd41f75 198 if( dst == NULL || dlen < n )
bryantaylor 0:eafc3fd41f75 199 {
bryantaylor 0:eafc3fd41f75 200 *olen = n;
bryantaylor 0:eafc3fd41f75 201 return( MBEDTLS_ERR_BASE64_BUFFER_TOO_SMALL );
bryantaylor 0:eafc3fd41f75 202 }
bryantaylor 0:eafc3fd41f75 203
bryantaylor 0:eafc3fd41f75 204 for( j = 3, n = x = 0, p = dst; i > 0; i--, src++ )
bryantaylor 0:eafc3fd41f75 205 {
bryantaylor 0:eafc3fd41f75 206 if( *src == '\r' || *src == '\n' || *src == ' ' )
bryantaylor 0:eafc3fd41f75 207 continue;
bryantaylor 0:eafc3fd41f75 208
bryantaylor 0:eafc3fd41f75 209 j -= ( base64_dec_map[*src] == 64 );
bryantaylor 0:eafc3fd41f75 210 x = ( x << 6 ) | ( base64_dec_map[*src] & 0x3F );
bryantaylor 0:eafc3fd41f75 211
bryantaylor 0:eafc3fd41f75 212 if( ++n == 4 )
bryantaylor 0:eafc3fd41f75 213 {
bryantaylor 0:eafc3fd41f75 214 n = 0;
bryantaylor 0:eafc3fd41f75 215 if( j > 0 ) *p++ = (unsigned char)( x >> 16 );
bryantaylor 0:eafc3fd41f75 216 if( j > 1 ) *p++ = (unsigned char)( x >> 8 );
bryantaylor 0:eafc3fd41f75 217 if( j > 2 ) *p++ = (unsigned char)( x );
bryantaylor 0:eafc3fd41f75 218 }
bryantaylor 0:eafc3fd41f75 219 }
bryantaylor 0:eafc3fd41f75 220
bryantaylor 0:eafc3fd41f75 221 *olen = p - dst;
bryantaylor 0:eafc3fd41f75 222
bryantaylor 0:eafc3fd41f75 223 return( 0 );
bryantaylor 0:eafc3fd41f75 224 }
bryantaylor 0:eafc3fd41f75 225
bryantaylor 0:eafc3fd41f75 226 #if defined(MBEDTLS_SELF_TEST)
bryantaylor 0:eafc3fd41f75 227
bryantaylor 0:eafc3fd41f75 228 static const unsigned char base64_test_dec[64] =
bryantaylor 0:eafc3fd41f75 229 {
bryantaylor 0:eafc3fd41f75 230 0x24, 0x48, 0x6E, 0x56, 0x87, 0x62, 0x5A, 0xBD,
bryantaylor 0:eafc3fd41f75 231 0xBF, 0x17, 0xD9, 0xA2, 0xC4, 0x17, 0x1A, 0x01,
bryantaylor 0:eafc3fd41f75 232 0x94, 0xED, 0x8F, 0x1E, 0x11, 0xB3, 0xD7, 0x09,
bryantaylor 0:eafc3fd41f75 233 0x0C, 0xB6, 0xE9, 0x10, 0x6F, 0x22, 0xEE, 0x13,
bryantaylor 0:eafc3fd41f75 234 0xCA, 0xB3, 0x07, 0x05, 0x76, 0xC9, 0xFA, 0x31,
bryantaylor 0:eafc3fd41f75 235 0x6C, 0x08, 0x34, 0xFF, 0x8D, 0xC2, 0x6C, 0x38,
bryantaylor 0:eafc3fd41f75 236 0x00, 0x43, 0xE9, 0x54, 0x97, 0xAF, 0x50, 0x4B,
bryantaylor 0:eafc3fd41f75 237 0xD1, 0x41, 0xBA, 0x95, 0x31, 0x5A, 0x0B, 0x97
bryantaylor 0:eafc3fd41f75 238 };
bryantaylor 0:eafc3fd41f75 239
bryantaylor 0:eafc3fd41f75 240 static const unsigned char base64_test_enc[] =
bryantaylor 0:eafc3fd41f75 241 "JEhuVodiWr2/F9mixBcaAZTtjx4Rs9cJDLbpEG8i7hPK"
bryantaylor 0:eafc3fd41f75 242 "swcFdsn6MWwINP+Nwmw4AEPpVJevUEvRQbqVMVoLlw==";
bryantaylor 0:eafc3fd41f75 243
bryantaylor 0:eafc3fd41f75 244 /*
bryantaylor 0:eafc3fd41f75 245 * Checkup routine
bryantaylor 0:eafc3fd41f75 246 */
bryantaylor 0:eafc3fd41f75 247 int mbedtls_base64_self_test( int verbose )
bryantaylor 0:eafc3fd41f75 248 {
bryantaylor 0:eafc3fd41f75 249 size_t len;
bryantaylor 0:eafc3fd41f75 250 const unsigned char *src;
bryantaylor 0:eafc3fd41f75 251 unsigned char buffer[128];
bryantaylor 0:eafc3fd41f75 252
bryantaylor 0:eafc3fd41f75 253 if( verbose != 0 )
bryantaylor 0:eafc3fd41f75 254 mbedtls_printf( " Base64 encoding test: " );
bryantaylor 0:eafc3fd41f75 255
bryantaylor 0:eafc3fd41f75 256 src = base64_test_dec;
bryantaylor 0:eafc3fd41f75 257
bryantaylor 0:eafc3fd41f75 258 if( mbedtls_base64_encode( buffer, sizeof( buffer ), &len, src, 64 ) != 0 ||
bryantaylor 0:eafc3fd41f75 259 memcmp( base64_test_enc, buffer, 88 ) != 0 )
bryantaylor 0:eafc3fd41f75 260 {
bryantaylor 0:eafc3fd41f75 261 if( verbose != 0 )
bryantaylor 0:eafc3fd41f75 262 mbedtls_printf( "failed\n" );
bryantaylor 0:eafc3fd41f75 263
bryantaylor 0:eafc3fd41f75 264 return( 1 );
bryantaylor 0:eafc3fd41f75 265 }
bryantaylor 0:eafc3fd41f75 266
bryantaylor 0:eafc3fd41f75 267 if( verbose != 0 )
bryantaylor 0:eafc3fd41f75 268 mbedtls_printf( "passed\n Base64 decoding test: " );
bryantaylor 0:eafc3fd41f75 269
bryantaylor 0:eafc3fd41f75 270 src = base64_test_enc;
bryantaylor 0:eafc3fd41f75 271
bryantaylor 0:eafc3fd41f75 272 if( mbedtls_base64_decode( buffer, sizeof( buffer ), &len, src, 88 ) != 0 ||
bryantaylor 0:eafc3fd41f75 273 memcmp( base64_test_dec, buffer, 64 ) != 0 )
bryantaylor 0:eafc3fd41f75 274 {
bryantaylor 0:eafc3fd41f75 275 if( verbose != 0 )
bryantaylor 0:eafc3fd41f75 276 mbedtls_printf( "failed\n" );
bryantaylor 0:eafc3fd41f75 277
bryantaylor 0:eafc3fd41f75 278 return( 1 );
bryantaylor 0:eafc3fd41f75 279 }
bryantaylor 0:eafc3fd41f75 280
bryantaylor 0:eafc3fd41f75 281 if( verbose != 0 )
bryantaylor 0:eafc3fd41f75 282 mbedtls_printf( "passed\n\n" );
bryantaylor 0:eafc3fd41f75 283
bryantaylor 0:eafc3fd41f75 284 return( 0 );
bryantaylor 0:eafc3fd41f75 285 }
bryantaylor 0:eafc3fd41f75 286
bryantaylor 0:eafc3fd41f75 287 #endif /* MBEDTLS_SELF_TEST */
bryantaylor 0:eafc3fd41f75 288
bryantaylor 0:eafc3fd41f75 289 #endif /* MBEDTLS_BASE64_C */