Alexandre Savard | 1b09e31 | 2012-08-07 20:33:29 -0400 | [diff] [blame] | 1 | /* crypto/asn1/a_utf8.c */ |
| 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 3 | * All rights reserved. |
| 4 | * |
| 5 | * This package is an SSL implementation written |
| 6 | * by Eric Young (eay@cryptsoft.com). |
| 7 | * The implementation was written so as to conform with Netscapes SSL. |
| 8 | * |
| 9 | * This library is free for commercial and non-commercial use as long as |
| 10 | * the following conditions are aheared to. The following conditions |
| 11 | * apply to all code found in this distribution, be it the RC4, RSA, |
| 12 | * lhash, DES, etc., code; not just the SSL code. The SSL documentation |
| 13 | * included with this distribution is covered by the same copyright terms |
| 14 | * except that the holder is Tim Hudson (tjh@cryptsoft.com). |
| 15 | * |
| 16 | * Copyright remains Eric Young's, and as such any Copyright notices in |
| 17 | * the code are not to be removed. |
| 18 | * If this package is used in a product, Eric Young should be given attribution |
| 19 | * as the author of the parts of the library used. |
| 20 | * This can be in the form of a textual message at program startup or |
| 21 | * in documentation (online or textual) provided with the package. |
| 22 | * |
| 23 | * Redistribution and use in source and binary forms, with or without |
| 24 | * modification, are permitted provided that the following conditions |
| 25 | * are met: |
| 26 | * 1. Redistributions of source code must retain the copyright |
| 27 | * notice, this list of conditions and the following disclaimer. |
| 28 | * 2. Redistributions in binary form must reproduce the above copyright |
| 29 | * notice, this list of conditions and the following disclaimer in the |
| 30 | * documentation and/or other materials provided with the distribution. |
| 31 | * 3. All advertising materials mentioning features or use of this software |
| 32 | * must display the following acknowledgement: |
| 33 | * "This product includes cryptographic software written by |
| 34 | * Eric Young (eay@cryptsoft.com)" |
| 35 | * The word 'cryptographic' can be left out if the rouines from the library |
| 36 | * being used are not cryptographic related :-). |
| 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
| 38 | * the apps directory (application code) you must include an acknowledgement: |
| 39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
| 40 | * |
| 41 | * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
| 42 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 43 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 44 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 45 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 46 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 47 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 48 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 49 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 50 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 51 | * SUCH DAMAGE. |
| 52 | * |
| 53 | * The licence and distribution terms for any publically available version or |
| 54 | * derivative of this code cannot be changed. i.e. this code cannot simply be |
| 55 | * copied and put under another distribution licence |
| 56 | * [including the GNU Public Licence.] |
| 57 | */ |
| 58 | |
| 59 | #include <stdio.h> |
| 60 | #include "cryptlib.h" |
| 61 | #include <openssl/asn1.h> |
| 62 | |
| 63 | |
| 64 | /* UTF8 utilities */ |
| 65 | |
| 66 | /* This parses a UTF8 string one character at a time. It is passed a pointer |
| 67 | * to the string and the length of the string. It sets 'value' to the value of |
| 68 | * the current character. It returns the number of characters read or a |
| 69 | * negative error code: |
| 70 | * -1 = string too short |
| 71 | * -2 = illegal character |
| 72 | * -3 = subsequent characters not of the form 10xxxxxx |
| 73 | * -4 = character encoded incorrectly (not minimal length). |
| 74 | */ |
| 75 | |
| 76 | int UTF8_getc(const unsigned char *str, int len, unsigned long *val) |
| 77 | { |
| 78 | const unsigned char *p; |
| 79 | unsigned long value; |
| 80 | int ret; |
| 81 | if(len <= 0) return 0; |
| 82 | p = str; |
| 83 | |
| 84 | /* Check syntax and work out the encoded value (if correct) */ |
| 85 | if((*p & 0x80) == 0) { |
| 86 | value = *p++ & 0x7f; |
| 87 | ret = 1; |
| 88 | } else if((*p & 0xe0) == 0xc0) { |
| 89 | if(len < 2) return -1; |
| 90 | if((p[1] & 0xc0) != 0x80) return -3; |
| 91 | value = (*p++ & 0x1f) << 6; |
| 92 | value |= *p++ & 0x3f; |
| 93 | if(value < 0x80) return -4; |
| 94 | ret = 2; |
| 95 | } else if((*p & 0xf0) == 0xe0) { |
| 96 | if(len < 3) return -1; |
| 97 | if( ((p[1] & 0xc0) != 0x80) |
| 98 | || ((p[2] & 0xc0) != 0x80) ) return -3; |
| 99 | value = (*p++ & 0xf) << 12; |
| 100 | value |= (*p++ & 0x3f) << 6; |
| 101 | value |= *p++ & 0x3f; |
| 102 | if(value < 0x800) return -4; |
| 103 | ret = 3; |
| 104 | } else if((*p & 0xf8) == 0xf0) { |
| 105 | if(len < 4) return -1; |
| 106 | if( ((p[1] & 0xc0) != 0x80) |
| 107 | || ((p[2] & 0xc0) != 0x80) |
| 108 | || ((p[3] & 0xc0) != 0x80) ) return -3; |
| 109 | value = ((unsigned long)(*p++ & 0x7)) << 18; |
| 110 | value |= (*p++ & 0x3f) << 12; |
| 111 | value |= (*p++ & 0x3f) << 6; |
| 112 | value |= *p++ & 0x3f; |
| 113 | if(value < 0x10000) return -4; |
| 114 | ret = 4; |
| 115 | } else if((*p & 0xfc) == 0xf8) { |
| 116 | if(len < 5) return -1; |
| 117 | if( ((p[1] & 0xc0) != 0x80) |
| 118 | || ((p[2] & 0xc0) != 0x80) |
| 119 | || ((p[3] & 0xc0) != 0x80) |
| 120 | || ((p[4] & 0xc0) != 0x80) ) return -3; |
| 121 | value = ((unsigned long)(*p++ & 0x3)) << 24; |
| 122 | value |= ((unsigned long)(*p++ & 0x3f)) << 18; |
| 123 | value |= ((unsigned long)(*p++ & 0x3f)) << 12; |
| 124 | value |= (*p++ & 0x3f) << 6; |
| 125 | value |= *p++ & 0x3f; |
| 126 | if(value < 0x200000) return -4; |
| 127 | ret = 5; |
| 128 | } else if((*p & 0xfe) == 0xfc) { |
| 129 | if(len < 6) return -1; |
| 130 | if( ((p[1] & 0xc0) != 0x80) |
| 131 | || ((p[2] & 0xc0) != 0x80) |
| 132 | || ((p[3] & 0xc0) != 0x80) |
| 133 | || ((p[4] & 0xc0) != 0x80) |
| 134 | || ((p[5] & 0xc0) != 0x80) ) return -3; |
| 135 | value = ((unsigned long)(*p++ & 0x1)) << 30; |
| 136 | value |= ((unsigned long)(*p++ & 0x3f)) << 24; |
| 137 | value |= ((unsigned long)(*p++ & 0x3f)) << 18; |
| 138 | value |= ((unsigned long)(*p++ & 0x3f)) << 12; |
| 139 | value |= (*p++ & 0x3f) << 6; |
| 140 | value |= *p++ & 0x3f; |
| 141 | if(value < 0x4000000) return -4; |
| 142 | ret = 6; |
| 143 | } else return -2; |
| 144 | *val = value; |
| 145 | return ret; |
| 146 | } |
| 147 | |
| 148 | /* This takes a character 'value' and writes the UTF8 encoded value in |
| 149 | * 'str' where 'str' is a buffer containing 'len' characters. Returns |
| 150 | * the number of characters written or -1 if 'len' is too small. 'str' can |
| 151 | * be set to NULL in which case it just returns the number of characters. |
| 152 | * It will need at most 6 characters. |
| 153 | */ |
| 154 | |
| 155 | int UTF8_putc(unsigned char *str, int len, unsigned long value) |
| 156 | { |
| 157 | if(!str) len = 6; /* Maximum we will need */ |
| 158 | else if(len <= 0) return -1; |
| 159 | if(value < 0x80) { |
| 160 | if(str) *str = (unsigned char)value; |
| 161 | return 1; |
| 162 | } |
| 163 | if(value < 0x800) { |
| 164 | if(len < 2) return -1; |
| 165 | if(str) { |
| 166 | *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0); |
| 167 | *str = (unsigned char)((value & 0x3f) | 0x80); |
| 168 | } |
| 169 | return 2; |
| 170 | } |
| 171 | if(value < 0x10000) { |
| 172 | if(len < 3) return -1; |
| 173 | if(str) { |
| 174 | *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0); |
| 175 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); |
| 176 | *str = (unsigned char)((value & 0x3f) | 0x80); |
| 177 | } |
| 178 | return 3; |
| 179 | } |
| 180 | if(value < 0x200000) { |
| 181 | if(len < 4) return -1; |
| 182 | if(str) { |
| 183 | *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0); |
| 184 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); |
| 185 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); |
| 186 | *str = (unsigned char)((value & 0x3f) | 0x80); |
| 187 | } |
| 188 | return 4; |
| 189 | } |
| 190 | if(value < 0x4000000) { |
| 191 | if(len < 5) return -1; |
| 192 | if(str) { |
| 193 | *str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8); |
| 194 | *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80); |
| 195 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); |
| 196 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); |
| 197 | *str = (unsigned char)((value & 0x3f) | 0x80); |
| 198 | } |
| 199 | return 5; |
| 200 | } |
| 201 | if(len < 6) return -1; |
| 202 | if(str) { |
| 203 | *str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc); |
| 204 | *str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80); |
| 205 | *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80); |
| 206 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); |
| 207 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); |
| 208 | *str = (unsigned char)((value & 0x3f) | 0x80); |
| 209 | } |
| 210 | return 6; |
| 211 | } |