1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@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@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@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@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
UTF8_getc(const unsigned char * str,int len,unsigned long * val)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
UTF8_putc(unsigned char * str,int len,unsigned long value)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