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