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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. | |
0f113f3e | 8 | * |
d77b3054 DSH |
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). | |
0f113f3e | 15 | * |
d77b3054 DSH |
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. | |
0f113f3e | 22 | * |
d77b3054 DSH |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d77b3054 DSH |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d77b3054 DSH |
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. | |
0f113f3e | 52 | * |
d77b3054 DSH |
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> | |
b39fc560 | 60 | #include "internal/cryptlib.h" |
ec577822 | 61 | #include <openssl/asn1.h> |
d77b3054 | 62 | |
aef838fc DSH |
63 | /* UTF8 utilities */ |
64 | ||
1d97c843 TH |
65 | /*- |
66 | * This parses a UTF8 string one character at a time. It is passed a pointer | |
aef838fc DSH |
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 | ||
6343829a | 76 | int UTF8_getc(const unsigned char *str, int len, unsigned long *val) |
aef838fc | 77 | { |
0f113f3e MC |
78 | const unsigned char *p; |
79 | unsigned long value; | |
80 | int ret; | |
81 | if (len <= 0) | |
82 | return 0; | |
83 | p = str; | |
aef838fc | 84 | |
0f113f3e MC |
85 | /* Check syntax and work out the encoded value (if correct) */ |
86 | if ((*p & 0x80) == 0) { | |
87 | value = *p++ & 0x7f; | |
88 | ret = 1; | |
89 | } else if ((*p & 0xe0) == 0xc0) { | |
90 | if (len < 2) | |
91 | return -1; | |
92 | if ((p[1] & 0xc0) != 0x80) | |
93 | return -3; | |
94 | value = (*p++ & 0x1f) << 6; | |
95 | value |= *p++ & 0x3f; | |
96 | if (value < 0x80) | |
97 | return -4; | |
98 | ret = 2; | |
99 | } else if ((*p & 0xf0) == 0xe0) { | |
100 | if (len < 3) | |
101 | return -1; | |
102 | if (((p[1] & 0xc0) != 0x80) | |
103 | || ((p[2] & 0xc0) != 0x80)) | |
104 | return -3; | |
105 | value = (*p++ & 0xf) << 12; | |
106 | value |= (*p++ & 0x3f) << 6; | |
107 | value |= *p++ & 0x3f; | |
108 | if (value < 0x800) | |
109 | return -4; | |
110 | ret = 3; | |
111 | } else if ((*p & 0xf8) == 0xf0) { | |
112 | if (len < 4) | |
113 | return -1; | |
114 | if (((p[1] & 0xc0) != 0x80) | |
115 | || ((p[2] & 0xc0) != 0x80) | |
116 | || ((p[3] & 0xc0) != 0x80)) | |
117 | return -3; | |
118 | value = ((unsigned long)(*p++ & 0x7)) << 18; | |
119 | value |= (*p++ & 0x3f) << 12; | |
120 | value |= (*p++ & 0x3f) << 6; | |
121 | value |= *p++ & 0x3f; | |
122 | if (value < 0x10000) | |
123 | return -4; | |
124 | ret = 4; | |
125 | } else if ((*p & 0xfc) == 0xf8) { | |
126 | if (len < 5) | |
127 | return -1; | |
128 | if (((p[1] & 0xc0) != 0x80) | |
129 | || ((p[2] & 0xc0) != 0x80) | |
130 | || ((p[3] & 0xc0) != 0x80) | |
131 | || ((p[4] & 0xc0) != 0x80)) | |
132 | return -3; | |
133 | value = ((unsigned long)(*p++ & 0x3)) << 24; | |
134 | value |= ((unsigned long)(*p++ & 0x3f)) << 18; | |
135 | value |= ((unsigned long)(*p++ & 0x3f)) << 12; | |
136 | value |= (*p++ & 0x3f) << 6; | |
137 | value |= *p++ & 0x3f; | |
138 | if (value < 0x200000) | |
139 | return -4; | |
140 | ret = 5; | |
141 | } else if ((*p & 0xfe) == 0xfc) { | |
142 | if (len < 6) | |
143 | return -1; | |
144 | if (((p[1] & 0xc0) != 0x80) | |
145 | || ((p[2] & 0xc0) != 0x80) | |
146 | || ((p[3] & 0xc0) != 0x80) | |
147 | || ((p[4] & 0xc0) != 0x80) | |
148 | || ((p[5] & 0xc0) != 0x80)) | |
149 | return -3; | |
150 | value = ((unsigned long)(*p++ & 0x1)) << 30; | |
151 | value |= ((unsigned long)(*p++ & 0x3f)) << 24; | |
152 | value |= ((unsigned long)(*p++ & 0x3f)) << 18; | |
153 | value |= ((unsigned long)(*p++ & 0x3f)) << 12; | |
154 | value |= (*p++ & 0x3f) << 6; | |
155 | value |= *p++ & 0x3f; | |
156 | if (value < 0x4000000) | |
157 | return -4; | |
158 | ret = 6; | |
159 | } else | |
160 | return -2; | |
161 | *val = value; | |
162 | return ret; | |
aef838fc DSH |
163 | } |
164 | ||
0f113f3e MC |
165 | /* |
166 | * This takes a character 'value' and writes the UTF8 encoded value in 'str' | |
167 | * where 'str' is a buffer containing 'len' characters. Returns the number of | |
168 | * characters written or -1 if 'len' is too small. 'str' can be set to NULL | |
169 | * in which case it just returns the number of characters. It will need at | |
170 | * most 6 characters. | |
aef838fc DSH |
171 | */ |
172 | ||
6343829a | 173 | int UTF8_putc(unsigned char *str, int len, unsigned long value) |
aef838fc | 174 | { |
0f113f3e MC |
175 | if (!str) |
176 | len = 6; /* Maximum we will need */ | |
177 | else if (len <= 0) | |
178 | return -1; | |
179 | if (value < 0x80) { | |
180 | if (str) | |
181 | *str = (unsigned char)value; | |
182 | return 1; | |
183 | } | |
184 | if (value < 0x800) { | |
185 | if (len < 2) | |
186 | return -1; | |
187 | if (str) { | |
188 | *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0); | |
189 | *str = (unsigned char)((value & 0x3f) | 0x80); | |
190 | } | |
191 | return 2; | |
192 | } | |
193 | if (value < 0x10000) { | |
194 | if (len < 3) | |
195 | return -1; | |
196 | if (str) { | |
197 | *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0); | |
198 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); | |
199 | *str = (unsigned char)((value & 0x3f) | 0x80); | |
200 | } | |
201 | return 3; | |
202 | } | |
203 | if (value < 0x200000) { | |
204 | if (len < 4) | |
205 | return -1; | |
206 | if (str) { | |
207 | *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0); | |
208 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); | |
209 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); | |
210 | *str = (unsigned char)((value & 0x3f) | 0x80); | |
211 | } | |
212 | return 4; | |
213 | } | |
214 | if (value < 0x4000000) { | |
215 | if (len < 5) | |
216 | return -1; | |
217 | if (str) { | |
218 | *str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8); | |
219 | *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80); | |
220 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); | |
221 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); | |
222 | *str = (unsigned char)((value & 0x3f) | 0x80); | |
223 | } | |
224 | return 5; | |
225 | } | |
226 | if (len < 6) | |
227 | return -1; | |
228 | if (str) { | |
229 | *str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc); | |
230 | *str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80); | |
231 | *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80); | |
232 | *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80); | |
233 | *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80); | |
234 | *str = (unsigned char)((value & 0x3f) | 0x80); | |
235 | } | |
236 | return 6; | |
aef838fc | 237 | } |