mbed TLS library
Dependents: HTTPClient-SSL WS_SERVER
polarssl/base64.c@0:137634ff4186, 2015-06-11 (annotated)
- Committer:
- ansond
- Date:
- Thu Jun 11 03:27:03 2015 +0000
- Revision:
- 0:137634ff4186
initial commit
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
ansond | 0:137634ff4186 | 1 | /* |
ansond | 0:137634ff4186 | 2 | * RFC 1521 base64 encoding/decoding |
ansond | 0:137634ff4186 | 3 | * |
ansond | 0:137634ff4186 | 4 | * Copyright (C) 2006-2014, ARM Limited, All Rights Reserved |
ansond | 0:137634ff4186 | 5 | * |
ansond | 0:137634ff4186 | 6 | * This file is part of mbed TLS (https://tls.mbed.org) |
ansond | 0:137634ff4186 | 7 | * |
ansond | 0:137634ff4186 | 8 | * This program is free software; you can redistribute it and/or modify |
ansond | 0:137634ff4186 | 9 | * it under the terms of the GNU General Public License as published by |
ansond | 0:137634ff4186 | 10 | * the Free Software Foundation; either version 2 of the License, or |
ansond | 0:137634ff4186 | 11 | * (at your option) any later version. |
ansond | 0:137634ff4186 | 12 | * |
ansond | 0:137634ff4186 | 13 | * This program is distributed in the hope that it will be useful, |
ansond | 0:137634ff4186 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
ansond | 0:137634ff4186 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
ansond | 0:137634ff4186 | 16 | * GNU General Public License for more details. |
ansond | 0:137634ff4186 | 17 | * |
ansond | 0:137634ff4186 | 18 | * You should have received a copy of the GNU General Public License along |
ansond | 0:137634ff4186 | 19 | * with this program; if not, write to the Free Software Foundation, Inc., |
ansond | 0:137634ff4186 | 20 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
ansond | 0:137634ff4186 | 21 | */ |
ansond | 0:137634ff4186 | 22 | |
ansond | 0:137634ff4186 | 23 | #if !defined(POLARSSL_CONFIG_FILE) |
ansond | 0:137634ff4186 | 24 | #include "polarssl/config.h" |
ansond | 0:137634ff4186 | 25 | #else |
ansond | 0:137634ff4186 | 26 | #include POLARSSL_CONFIG_FILE |
ansond | 0:137634ff4186 | 27 | #endif |
ansond | 0:137634ff4186 | 28 | |
ansond | 0:137634ff4186 | 29 | #if defined(POLARSSL_BASE64_C) |
ansond | 0:137634ff4186 | 30 | |
ansond | 0:137634ff4186 | 31 | #include "polarssl/base64.h" |
ansond | 0:137634ff4186 | 32 | |
ansond | 0:137634ff4186 | 33 | #if defined(_MSC_VER) && !defined(EFIX64) && !defined(EFI32) |
ansond | 0:137634ff4186 | 34 | #include <basetsd.h> |
ansond | 0:137634ff4186 | 35 | typedef UINT32 uint32_t; |
ansond | 0:137634ff4186 | 36 | #else |
ansond | 0:137634ff4186 | 37 | #include <inttypes.h> |
ansond | 0:137634ff4186 | 38 | #endif |
ansond | 0:137634ff4186 | 39 | |
ansond | 0:137634ff4186 | 40 | #if defined(POLARSSL_SELF_TEST) |
ansond | 0:137634ff4186 | 41 | #include <string.h> |
ansond | 0:137634ff4186 | 42 | #if defined(POLARSSL_PLATFORM_C) |
ansond | 0:137634ff4186 | 43 | #include "polarssl/platform.h" |
ansond | 0:137634ff4186 | 44 | #else |
ansond | 0:137634ff4186 | 45 | #include <stdio.h> |
ansond | 0:137634ff4186 | 46 | #define polarssl_printf printf |
ansond | 0:137634ff4186 | 47 | #endif /* POLARSSL_PLATFORM_C */ |
ansond | 0:137634ff4186 | 48 | #endif /* POLARSSL_SELF_TEST */ |
ansond | 0:137634ff4186 | 49 | |
ansond | 0:137634ff4186 | 50 | static const unsigned char base64_enc_map[64] = |
ansond | 0:137634ff4186 | 51 | { |
ansond | 0:137634ff4186 | 52 | 'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', |
ansond | 0:137634ff4186 | 53 | 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', |
ansond | 0:137634ff4186 | 54 | 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', |
ansond | 0:137634ff4186 | 55 | 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', |
ansond | 0:137634ff4186 | 56 | 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', |
ansond | 0:137634ff4186 | 57 | 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', |
ansond | 0:137634ff4186 | 58 | '8', '9', '+', '/' |
ansond | 0:137634ff4186 | 59 | }; |
ansond | 0:137634ff4186 | 60 | |
ansond | 0:137634ff4186 | 61 | static const unsigned char base64_dec_map[128] = |
ansond | 0:137634ff4186 | 62 | { |
ansond | 0:137634ff4186 | 63 | 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, |
ansond | 0:137634ff4186 | 64 | 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, |
ansond | 0:137634ff4186 | 65 | 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, |
ansond | 0:137634ff4186 | 66 | 127, 127, 127, 127, 127, 127, 127, 127, 127, 127, |
ansond | 0:137634ff4186 | 67 | 127, 127, 127, 62, 127, 127, 127, 63, 52, 53, |
ansond | 0:137634ff4186 | 68 | 54, 55, 56, 57, 58, 59, 60, 61, 127, 127, |
ansond | 0:137634ff4186 | 69 | 127, 64, 127, 127, 127, 0, 1, 2, 3, 4, |
ansond | 0:137634ff4186 | 70 | 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, |
ansond | 0:137634ff4186 | 71 | 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, |
ansond | 0:137634ff4186 | 72 | 25, 127, 127, 127, 127, 127, 127, 26, 27, 28, |
ansond | 0:137634ff4186 | 73 | 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, |
ansond | 0:137634ff4186 | 74 | 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, |
ansond | 0:137634ff4186 | 75 | 49, 50, 51, 127, 127, 127, 127, 127 |
ansond | 0:137634ff4186 | 76 | }; |
ansond | 0:137634ff4186 | 77 | |
ansond | 0:137634ff4186 | 78 | /* |
ansond | 0:137634ff4186 | 79 | * Encode a buffer into base64 format |
ansond | 0:137634ff4186 | 80 | */ |
ansond | 0:137634ff4186 | 81 | int base64_encode( unsigned char *dst, size_t *dlen, |
ansond | 0:137634ff4186 | 82 | const unsigned char *src, size_t slen ) |
ansond | 0:137634ff4186 | 83 | { |
ansond | 0:137634ff4186 | 84 | size_t i, n; |
ansond | 0:137634ff4186 | 85 | int C1, C2, C3; |
ansond | 0:137634ff4186 | 86 | unsigned char *p; |
ansond | 0:137634ff4186 | 87 | |
ansond | 0:137634ff4186 | 88 | if( slen == 0 ) |
ansond | 0:137634ff4186 | 89 | { |
ansond | 0:137634ff4186 | 90 | *dlen = 0; |
ansond | 0:137634ff4186 | 91 | return( 0 ); |
ansond | 0:137634ff4186 | 92 | } |
ansond | 0:137634ff4186 | 93 | |
ansond | 0:137634ff4186 | 94 | n = ( slen << 3 ) / 6; |
ansond | 0:137634ff4186 | 95 | |
ansond | 0:137634ff4186 | 96 | switch( ( slen << 3 ) - ( n * 6 ) ) |
ansond | 0:137634ff4186 | 97 | { |
ansond | 0:137634ff4186 | 98 | case 2: n += 3; break; |
ansond | 0:137634ff4186 | 99 | case 4: n += 2; break; |
ansond | 0:137634ff4186 | 100 | default: break; |
ansond | 0:137634ff4186 | 101 | } |
ansond | 0:137634ff4186 | 102 | |
ansond | 0:137634ff4186 | 103 | if( *dlen < n + 1 ) |
ansond | 0:137634ff4186 | 104 | { |
ansond | 0:137634ff4186 | 105 | *dlen = n + 1; |
ansond | 0:137634ff4186 | 106 | return( POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL ); |
ansond | 0:137634ff4186 | 107 | } |
ansond | 0:137634ff4186 | 108 | |
ansond | 0:137634ff4186 | 109 | n = ( slen / 3 ) * 3; |
ansond | 0:137634ff4186 | 110 | |
ansond | 0:137634ff4186 | 111 | for( i = 0, p = dst; i < n; i += 3 ) |
ansond | 0:137634ff4186 | 112 | { |
ansond | 0:137634ff4186 | 113 | C1 = *src++; |
ansond | 0:137634ff4186 | 114 | C2 = *src++; |
ansond | 0:137634ff4186 | 115 | C3 = *src++; |
ansond | 0:137634ff4186 | 116 | |
ansond | 0:137634ff4186 | 117 | *p++ = base64_enc_map[(C1 >> 2) & 0x3F]; |
ansond | 0:137634ff4186 | 118 | *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F]; |
ansond | 0:137634ff4186 | 119 | *p++ = base64_enc_map[(((C2 & 15) << 2) + (C3 >> 6)) & 0x3F]; |
ansond | 0:137634ff4186 | 120 | *p++ = base64_enc_map[C3 & 0x3F]; |
ansond | 0:137634ff4186 | 121 | } |
ansond | 0:137634ff4186 | 122 | |
ansond | 0:137634ff4186 | 123 | if( i < slen ) |
ansond | 0:137634ff4186 | 124 | { |
ansond | 0:137634ff4186 | 125 | C1 = *src++; |
ansond | 0:137634ff4186 | 126 | C2 = ( ( i + 1 ) < slen ) ? *src++ : 0; |
ansond | 0:137634ff4186 | 127 | |
ansond | 0:137634ff4186 | 128 | *p++ = base64_enc_map[(C1 >> 2) & 0x3F]; |
ansond | 0:137634ff4186 | 129 | *p++ = base64_enc_map[(((C1 & 3) << 4) + (C2 >> 4)) & 0x3F]; |
ansond | 0:137634ff4186 | 130 | |
ansond | 0:137634ff4186 | 131 | if( ( i + 1 ) < slen ) |
ansond | 0:137634ff4186 | 132 | *p++ = base64_enc_map[((C2 & 15) << 2) & 0x3F]; |
ansond | 0:137634ff4186 | 133 | else *p++ = '='; |
ansond | 0:137634ff4186 | 134 | |
ansond | 0:137634ff4186 | 135 | *p++ = '='; |
ansond | 0:137634ff4186 | 136 | } |
ansond | 0:137634ff4186 | 137 | |
ansond | 0:137634ff4186 | 138 | *dlen = p - dst; |
ansond | 0:137634ff4186 | 139 | *p = 0; |
ansond | 0:137634ff4186 | 140 | |
ansond | 0:137634ff4186 | 141 | return( 0 ); |
ansond | 0:137634ff4186 | 142 | } |
ansond | 0:137634ff4186 | 143 | |
ansond | 0:137634ff4186 | 144 | /* |
ansond | 0:137634ff4186 | 145 | * Decode a base64-formatted buffer |
ansond | 0:137634ff4186 | 146 | */ |
ansond | 0:137634ff4186 | 147 | int base64_decode( unsigned char *dst, size_t *dlen, |
ansond | 0:137634ff4186 | 148 | const unsigned char *src, size_t slen ) |
ansond | 0:137634ff4186 | 149 | { |
ansond | 0:137634ff4186 | 150 | size_t i, n; |
ansond | 0:137634ff4186 | 151 | uint32_t j, x; |
ansond | 0:137634ff4186 | 152 | unsigned char *p; |
ansond | 0:137634ff4186 | 153 | |
ansond | 0:137634ff4186 | 154 | /* First pass: check for validity and get output length */ |
ansond | 0:137634ff4186 | 155 | for( i = n = j = 0; i < slen; i++ ) |
ansond | 0:137634ff4186 | 156 | { |
ansond | 0:137634ff4186 | 157 | /* Skip spaces before checking for EOL */ |
ansond | 0:137634ff4186 | 158 | x = 0; |
ansond | 0:137634ff4186 | 159 | while( i < slen && src[i] == ' ' ) |
ansond | 0:137634ff4186 | 160 | { |
ansond | 0:137634ff4186 | 161 | ++i; |
ansond | 0:137634ff4186 | 162 | ++x; |
ansond | 0:137634ff4186 | 163 | } |
ansond | 0:137634ff4186 | 164 | |
ansond | 0:137634ff4186 | 165 | /* Spaces at end of buffer are OK */ |
ansond | 0:137634ff4186 | 166 | if( i == slen ) |
ansond | 0:137634ff4186 | 167 | break; |
ansond | 0:137634ff4186 | 168 | |
ansond | 0:137634ff4186 | 169 | if( ( slen - i ) >= 2 && |
ansond | 0:137634ff4186 | 170 | src[i] == '\r' && src[i + 1] == '\n' ) |
ansond | 0:137634ff4186 | 171 | continue; |
ansond | 0:137634ff4186 | 172 | |
ansond | 0:137634ff4186 | 173 | if( src[i] == '\n' ) |
ansond | 0:137634ff4186 | 174 | continue; |
ansond | 0:137634ff4186 | 175 | |
ansond | 0:137634ff4186 | 176 | /* Space inside a line is an error */ |
ansond | 0:137634ff4186 | 177 | if( x != 0 ) |
ansond | 0:137634ff4186 | 178 | return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
ansond | 0:137634ff4186 | 179 | |
ansond | 0:137634ff4186 | 180 | if( src[i] == '=' && ++j > 2 ) |
ansond | 0:137634ff4186 | 181 | return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
ansond | 0:137634ff4186 | 182 | |
ansond | 0:137634ff4186 | 183 | if( src[i] > 127 || base64_dec_map[src[i]] == 127 ) |
ansond | 0:137634ff4186 | 184 | return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
ansond | 0:137634ff4186 | 185 | |
ansond | 0:137634ff4186 | 186 | if( base64_dec_map[src[i]] < 64 && j != 0 ) |
ansond | 0:137634ff4186 | 187 | return( POLARSSL_ERR_BASE64_INVALID_CHARACTER ); |
ansond | 0:137634ff4186 | 188 | |
ansond | 0:137634ff4186 | 189 | n++; |
ansond | 0:137634ff4186 | 190 | } |
ansond | 0:137634ff4186 | 191 | |
ansond | 0:137634ff4186 | 192 | if( n == 0 ) |
ansond | 0:137634ff4186 | 193 | return( 0 ); |
ansond | 0:137634ff4186 | 194 | |
ansond | 0:137634ff4186 | 195 | n = ( ( n * 6 ) + 7 ) >> 3; |
ansond | 0:137634ff4186 | 196 | n -= j; |
ansond | 0:137634ff4186 | 197 | |
ansond | 0:137634ff4186 | 198 | if( dst == NULL || *dlen < n ) |
ansond | 0:137634ff4186 | 199 | { |
ansond | 0:137634ff4186 | 200 | *dlen = n; |
ansond | 0:137634ff4186 | 201 | return( POLARSSL_ERR_BASE64_BUFFER_TOO_SMALL ); |
ansond | 0:137634ff4186 | 202 | } |
ansond | 0:137634ff4186 | 203 | |
ansond | 0:137634ff4186 | 204 | for( j = 3, n = x = 0, p = dst; i > 0; i--, src++ ) |
ansond | 0:137634ff4186 | 205 | { |
ansond | 0:137634ff4186 | 206 | if( *src == '\r' || *src == '\n' || *src == ' ' ) |
ansond | 0:137634ff4186 | 207 | continue; |
ansond | 0:137634ff4186 | 208 | |
ansond | 0:137634ff4186 | 209 | j -= ( base64_dec_map[*src] == 64 ); |
ansond | 0:137634ff4186 | 210 | x = ( x << 6 ) | ( base64_dec_map[*src] & 0x3F ); |
ansond | 0:137634ff4186 | 211 | |
ansond | 0:137634ff4186 | 212 | if( ++n == 4 ) |
ansond | 0:137634ff4186 | 213 | { |
ansond | 0:137634ff4186 | 214 | n = 0; |
ansond | 0:137634ff4186 | 215 | if( j > 0 ) *p++ = (unsigned char)( x >> 16 ); |
ansond | 0:137634ff4186 | 216 | if( j > 1 ) *p++ = (unsigned char)( x >> 8 ); |
ansond | 0:137634ff4186 | 217 | if( j > 2 ) *p++ = (unsigned char)( x ); |
ansond | 0:137634ff4186 | 218 | } |
ansond | 0:137634ff4186 | 219 | } |
ansond | 0:137634ff4186 | 220 | |
ansond | 0:137634ff4186 | 221 | *dlen = p - dst; |
ansond | 0:137634ff4186 | 222 | |
ansond | 0:137634ff4186 | 223 | return( 0 ); |
ansond | 0:137634ff4186 | 224 | } |
ansond | 0:137634ff4186 | 225 | |
ansond | 0:137634ff4186 | 226 | #if defined(POLARSSL_SELF_TEST) |
ansond | 0:137634ff4186 | 227 | |
ansond | 0:137634ff4186 | 228 | static const unsigned char base64_test_dec[64] = |
ansond | 0:137634ff4186 | 229 | { |
ansond | 0:137634ff4186 | 230 | 0x24, 0x48, 0x6E, 0x56, 0x87, 0x62, 0x5A, 0xBD, |
ansond | 0:137634ff4186 | 231 | 0xBF, 0x17, 0xD9, 0xA2, 0xC4, 0x17, 0x1A, 0x01, |
ansond | 0:137634ff4186 | 232 | 0x94, 0xED, 0x8F, 0x1E, 0x11, 0xB3, 0xD7, 0x09, |
ansond | 0:137634ff4186 | 233 | 0x0C, 0xB6, 0xE9, 0x10, 0x6F, 0x22, 0xEE, 0x13, |
ansond | 0:137634ff4186 | 234 | 0xCA, 0xB3, 0x07, 0x05, 0x76, 0xC9, 0xFA, 0x31, |
ansond | 0:137634ff4186 | 235 | 0x6C, 0x08, 0x34, 0xFF, 0x8D, 0xC2, 0x6C, 0x38, |
ansond | 0:137634ff4186 | 236 | 0x00, 0x43, 0xE9, 0x54, 0x97, 0xAF, 0x50, 0x4B, |
ansond | 0:137634ff4186 | 237 | 0xD1, 0x41, 0xBA, 0x95, 0x31, 0x5A, 0x0B, 0x97 |
ansond | 0:137634ff4186 | 238 | }; |
ansond | 0:137634ff4186 | 239 | |
ansond | 0:137634ff4186 | 240 | static const unsigned char base64_test_enc[] = |
ansond | 0:137634ff4186 | 241 | "JEhuVodiWr2/F9mixBcaAZTtjx4Rs9cJDLbpEG8i7hPK" |
ansond | 0:137634ff4186 | 242 | "swcFdsn6MWwINP+Nwmw4AEPpVJevUEvRQbqVMVoLlw=="; |
ansond | 0:137634ff4186 | 243 | |
ansond | 0:137634ff4186 | 244 | /* |
ansond | 0:137634ff4186 | 245 | * Checkup routine |
ansond | 0:137634ff4186 | 246 | */ |
ansond | 0:137634ff4186 | 247 | int base64_self_test( int verbose ) |
ansond | 0:137634ff4186 | 248 | { |
ansond | 0:137634ff4186 | 249 | size_t len; |
ansond | 0:137634ff4186 | 250 | const unsigned char *src; |
ansond | 0:137634ff4186 | 251 | unsigned char buffer[128]; |
ansond | 0:137634ff4186 | 252 | |
ansond | 0:137634ff4186 | 253 | if( verbose != 0 ) |
ansond | 0:137634ff4186 | 254 | polarssl_printf( " Base64 encoding test: " ); |
ansond | 0:137634ff4186 | 255 | |
ansond | 0:137634ff4186 | 256 | len = sizeof( buffer ); |
ansond | 0:137634ff4186 | 257 | src = base64_test_dec; |
ansond | 0:137634ff4186 | 258 | |
ansond | 0:137634ff4186 | 259 | if( base64_encode( buffer, &len, src, 64 ) != 0 || |
ansond | 0:137634ff4186 | 260 | memcmp( base64_test_enc, buffer, 88 ) != 0 ) |
ansond | 0:137634ff4186 | 261 | { |
ansond | 0:137634ff4186 | 262 | if( verbose != 0 ) |
ansond | 0:137634ff4186 | 263 | polarssl_printf( "failed\n" ); |
ansond | 0:137634ff4186 | 264 | |
ansond | 0:137634ff4186 | 265 | return( 1 ); |
ansond | 0:137634ff4186 | 266 | } |
ansond | 0:137634ff4186 | 267 | |
ansond | 0:137634ff4186 | 268 | if( verbose != 0 ) |
ansond | 0:137634ff4186 | 269 | polarssl_printf( "passed\n Base64 decoding test: " ); |
ansond | 0:137634ff4186 | 270 | |
ansond | 0:137634ff4186 | 271 | len = sizeof( buffer ); |
ansond | 0:137634ff4186 | 272 | src = base64_test_enc; |
ansond | 0:137634ff4186 | 273 | |
ansond | 0:137634ff4186 | 274 | if( base64_decode( buffer, &len, src, 88 ) != 0 || |
ansond | 0:137634ff4186 | 275 | memcmp( base64_test_dec, buffer, 64 ) != 0 ) |
ansond | 0:137634ff4186 | 276 | { |
ansond | 0:137634ff4186 | 277 | if( verbose != 0 ) |
ansond | 0:137634ff4186 | 278 | polarssl_printf( "failed\n" ); |
ansond | 0:137634ff4186 | 279 | |
ansond | 0:137634ff4186 | 280 | return( 1 ); |
ansond | 0:137634ff4186 | 281 | } |
ansond | 0:137634ff4186 | 282 | |
ansond | 0:137634ff4186 | 283 | if( verbose != 0 ) |
ansond | 0:137634ff4186 | 284 | polarssl_printf( "passed\n\n" ); |
ansond | 0:137634ff4186 | 285 | |
ansond | 0:137634ff4186 | 286 | return( 0 ); |
ansond | 0:137634ff4186 | 287 | } |
ansond | 0:137634ff4186 | 288 | |
ansond | 0:137634ff4186 | 289 | #endif /* POLARSSL_SELF_TEST */ |
ansond | 0:137634ff4186 | 290 | |
ansond | 0:137634ff4186 | 291 | #endif /* POLARSSL_BASE64_C */ |
ansond | 0:137634ff4186 | 292 |