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 #include "asn1_locl.h" 63 64 /* UTF8 utilities */ 65 66 /* 67 * This parses a UTF8 string one character at a time. It is passed a pointer 68 * to the string and the length of the string. It sets 'value' to the value 69 * of the current character. It returns the number of characters read or a 70 * negative error code: -1 = string too short -2 = illegal character -3 = 71 * subsequent characters not of the form 10xxxxxx -4 = character encoded 72 * incorrectly (not minimal length). 73 */ 74 75 int UTF8_getc(const unsigned char *str, int len, uint32_t *val) 76 { 77 const unsigned char *p; 78 uint32_t value; 79 int ret; 80 if (len <= 0) 81 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) 90 return -1; 91 if ((p[1] & 0xc0) != 0x80) 92 return -3; 93 value = (*p++ & 0x1f) << 6; 94 value |= *p++ & 0x3f; 95 if (value < 0x80) 96 return -4; 97 ret = 2; 98 } else if ((*p & 0xf0) == 0xe0) { 99 if (len < 3) 100 return -1; 101 if (((p[1] & 0xc0) != 0x80) 102 || ((p[2] & 0xc0) != 0x80)) 103 return -3; 104 value = (*p++ & 0xf) << 12; 105 value |= (*p++ & 0x3f) << 6; 106 value |= *p++ & 0x3f; 107 if (value < 0x800) 108 return -4; 109 ret = 3; 110 } else if ((*p & 0xf8) == 0xf0) { 111 if (len < 4) 112 return -1; 113 if (((p[1] & 0xc0) != 0x80) 114 || ((p[2] & 0xc0) != 0x80) 115 || ((p[3] & 0xc0) != 0x80)) 116 return -3; 117 value = ((uint32_t)(*p++ & 0x7)) << 18; 118 value |= (*p++ & 0x3f) << 12; 119 value |= (*p++ & 0x3f) << 6; 120 value |= *p++ & 0x3f; 121 if (value < 0x10000) 122 return -4; 123 ret = 4; 124 } else if ((*p & 0xfc) == 0xf8) { 125 if (len < 5) 126 return -1; 127 if (((p[1] & 0xc0) != 0x80) 128 || ((p[2] & 0xc0) != 0x80) 129 || ((p[3] & 0xc0) != 0x80) 130 || ((p[4] & 0xc0) != 0x80)) 131 return -3; 132 value = ((uint32_t)(*p++ & 0x3)) << 24; 133 value |= ((uint32_t)(*p++ & 0x3f)) << 18; 134 value |= ((uint32_t)(*p++ & 0x3f)) << 12; 135 value |= (*p++ & 0x3f) << 6; 136 value |= *p++ & 0x3f; 137 if (value < 0x200000) 138 return -4; 139 ret = 5; 140 } else if ((*p & 0xfe) == 0xfc) { 141 if (len < 6) 142 return -1; 143 if (((p[1] & 0xc0) != 0x80) 144 || ((p[2] & 0xc0) != 0x80) 145 || ((p[3] & 0xc0) != 0x80) 146 || ((p[4] & 0xc0) != 0x80) 147 || ((p[5] & 0xc0) != 0x80)) 148 return -3; 149 value = ((uint32_t)(*p++ & 0x1)) << 30; 150 value |= ((uint32_t)(*p++ & 0x3f)) << 24; 151 value |= ((uint32_t)(*p++ & 0x3f)) << 18; 152 value |= ((uint32_t)(*p++ & 0x3f)) << 12; 153 value |= (*p++ & 0x3f) << 6; 154 value |= *p++ & 0x3f; 155 if (value < 0x4000000) 156 return -4; 157 ret = 6; 158 } else 159 return -2; 160 *val = value; 161 return ret; 162 } 163 164 /* 165 * This takes a character 'value' and writes the UTF8 encoded value in 'str' 166 * where 'str' is a buffer containing 'len' characters. Returns the number of 167 * characters written or -1 if 'len' is too small. 'str' can be set to NULL 168 * in which case it just returns the number of characters. It will need at 169 * most 6 characters. 170 */ 171 172 int UTF8_putc(unsigned char *str, int len, uint32_t value) 173 { 174 if (!str) 175 len = 6; /* Maximum we will need */ 176 else if (len <= 0) 177 return -1; 178 if (value < 0x80) { 179 if (str) 180 *str = (unsigned char)value; 181 return 1; 182 } 183 if (value < 0x800) { 184 if (len < 2) 185 return -1; 186 if (str) { 187 *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0); 188 *str = (unsigned char)((value & 0x3f) | 0x80); 189 } 190 return 2; 191 } 192 if (value < 0x10000) { 193 if (len < 3) 194 return -1; 195 if (str) { 196 *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0); 197 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); 198 *str = (unsigned char)((value & 0x3f) | 0x80); 199 } 200 return 3; 201 } 202 if (value < 0x200000) { 203 if (len < 4) 204 return -1; 205 if (str) { 206 *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0); 207 *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); 208 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); 209 *str = (unsigned char)((value & 0x3f) | 0x80); 210 } 211 return 4; 212 } 213 if (value < 0x4000000) { 214 if (len < 5) 215 return -1; 216 if (str) { 217 *str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8); 218 *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80); 219 *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); 220 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); 221 *str = (unsigned char)((value & 0x3f) | 0x80); 222 } 223 return 5; 224 } 225 if (len < 6) 226 return -1; 227 if (str) { 228 *str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc); 229 *str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80); 230 *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80); 231 *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); 232 *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); 233 *str = (unsigned char)((value & 0x3f) | 0x80); 234 } 235 return 6; 236 } 237
