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d77b3054 DSH |
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" | |
ec577822 | 61 | #include <openssl/asn1.h> |
d77b3054 | 62 | |
aef838fc DSH |
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 | ||
4d6e1e4f | 76 | int UTF8_getc(const unsigned char *str, size_t len, unsigned long *val) |
aef838fc | 77 | { |
042a93e4 | 78 | const unsigned char *p; |
aef838fc DSH |
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; | |
849c0e30 | 109 | value = ((unsigned long)(*p++ & 0x7)) << 18; |
aef838fc DSH |
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; | |
849c0e30 BM |
121 | value = ((unsigned long)(*p++ & 0x3)) << 24; |
122 | value |= ((unsigned long)(*p++ & 0x3f)) << 18; | |
123 | value |= ((unsigned long)(*p++ & 0x3f)) << 12; | |
aef838fc DSH |
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; | |
849c0e30 BM |
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; | |
aef838fc DSH |
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 | ||
4d6e1e4f | 155 | int UTF8_putc(unsigned char *str, size_t len, unsigned long value) |
aef838fc DSH |
156 | { |
157 | if(!str) len = 6; /* Maximum we will need */ | |
158 | else if(len <= 0) return -1; | |
159 | if(value < 0x80) { | |
bf196635 | 160 | if(str) *str = (unsigned char)value; |
aef838fc DSH |
161 | return 1; |
162 | } | |
163 | if(value < 0x800) { | |
164 | if(len < 2) return -1; | |
165 | if(str) { | |
bf196635 DSH |
166 | *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0); |
167 | *str = (unsigned char)((value & 0x3f) | 0x80); | |
aef838fc DSH |
168 | } |
169 | return 2; | |
170 | } | |
171 | if(value < 0x10000) { | |
172 | if(len < 3) return -1; | |
173 | if(str) { | |
bf196635 DSH |
174 | *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0); |
175 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); | |
176 | *str = (unsigned char)((value & 0x3f) | 0x80); | |
aef838fc DSH |
177 | } |
178 | return 3; | |
179 | } | |
180 | if(value < 0x200000) { | |
181 | if(len < 4) return -1; | |
182 | if(str) { | |
bf196635 DSH |
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); | |
aef838fc DSH |
187 | } |
188 | return 4; | |
189 | } | |
190 | if(value < 0x4000000) { | |
191 | if(len < 5) return -1; | |
192 | if(str) { | |
bf196635 DSH |
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); | |
aef838fc DSH |
198 | } |
199 | return 5; | |
200 | } | |
201 | if(len < 6) return -1; | |
202 | if(str) { | |
bf196635 DSH |
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); | |
aef838fc DSH |
209 | } |
210 | return 6; | |
211 | } |