1 /*
2 * Copyright 2017-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <string.h>
11 #include <stdio.h>
12 #include "crypto/ctype.h"
13 #include <openssl/ebcdic.h>
14
15 /*
16 * Define the character classes for each character in the seven bit ASCII
17 * character set. This is independent of the host's character set, characters
18 * are converted to ASCII before being used as an index in to this table.
19 * Characters outside of the seven bit ASCII range are detected before indexing.
20 */
21 static const unsigned short ctype_char_map[128] = {
22 /* 00 nul */ CTYPE_MASK_cntrl,
23 /* 01 soh */ CTYPE_MASK_cntrl,
24 /* 02 stx */ CTYPE_MASK_cntrl,
25 /* 03 etx */ CTYPE_MASK_cntrl,
26 /* 04 eot */ CTYPE_MASK_cntrl,
27 /* 05 enq */ CTYPE_MASK_cntrl,
28 /* 06 ack */ CTYPE_MASK_cntrl,
29 /* 07 \a */ CTYPE_MASK_cntrl,
30 /* 08 \b */ CTYPE_MASK_cntrl,
31 /* 09 \t */ CTYPE_MASK_blank | CTYPE_MASK_cntrl | CTYPE_MASK_space,
32 /* 0A \n */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
33 /* 0B \v */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
34 /* 0C \f */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
35 /* 0D \r */ CTYPE_MASK_cntrl | CTYPE_MASK_space,
36 /* 0E so */ CTYPE_MASK_cntrl,
37 /* 0F si */ CTYPE_MASK_cntrl,
38 /* 10 dle */ CTYPE_MASK_cntrl,
39 /* 11 dc1 */ CTYPE_MASK_cntrl,
40 /* 12 dc2 */ CTYPE_MASK_cntrl,
41 /* 13 dc3 */ CTYPE_MASK_cntrl,
42 /* 14 dc4 */ CTYPE_MASK_cntrl,
43 /* 15 nak */ CTYPE_MASK_cntrl,
44 /* 16 syn */ CTYPE_MASK_cntrl,
45 /* 17 etb */ CTYPE_MASK_cntrl,
46 /* 18 can */ CTYPE_MASK_cntrl,
47 /* 19 em */ CTYPE_MASK_cntrl,
48 /* 1A sub */ CTYPE_MASK_cntrl,
49 /* 1B esc */ CTYPE_MASK_cntrl,
50 /* 1C fs */ CTYPE_MASK_cntrl,
51 /* 1D gs */ CTYPE_MASK_cntrl,
52 /* 1E rs */ CTYPE_MASK_cntrl,
53 /* 1F us */ CTYPE_MASK_cntrl,
54 /* 20 */ CTYPE_MASK_blank | CTYPE_MASK_print | CTYPE_MASK_space
55 | CTYPE_MASK_asn1print,
56 /* 21 ! */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
57 /* 22 " */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
58 /* 23 # */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
59 /* 24 $ */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
60 /* 25 % */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
61 /* 26 & */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
62 /* 27 ' */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
63 | CTYPE_MASK_asn1print,
64 /* 28 ( */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
65 | CTYPE_MASK_asn1print,
66 /* 29 ) */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
67 | CTYPE_MASK_asn1print,
68 /* 2A * */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
69 /* 2B + */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
70 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
71 /* 2C , */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
72 | CTYPE_MASK_asn1print,
73 /* 2D - */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
74 | CTYPE_MASK_asn1print,
75 /* 2E . */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
76 | CTYPE_MASK_asn1print,
77 /* 2F / */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
78 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
79 /* 30 0 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
80 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
81 /* 31 1 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
82 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
83 /* 32 2 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
84 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
85 /* 33 3 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
86 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
87 /* 34 4 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
88 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
89 /* 35 5 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
90 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
91 /* 36 6 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
92 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
93 /* 37 7 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
94 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
95 /* 38 8 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
96 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
97 /* 39 9 */ CTYPE_MASK_digit | CTYPE_MASK_graph | CTYPE_MASK_print
98 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
99 /* 3A : */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
100 | CTYPE_MASK_asn1print,
101 /* 3B ; */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
102 /* 3C < */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
103 /* 3D = */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
104 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
105 /* 3E > */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
106 /* 3F ? */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct
107 | CTYPE_MASK_asn1print,
108 /* 40 @ */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
109 /* 41 A */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
110 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
111 /* 42 B */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
112 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
113 /* 43 C */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
114 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
115 /* 44 D */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
116 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
117 /* 45 E */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
118 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
119 /* 46 F */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
120 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
121 /* 47 G */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
122 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
123 /* 48 H */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
124 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
125 /* 49 I */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
126 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
127 /* 4A J */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
128 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
129 /* 4B K */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
130 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
131 /* 4C L */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
132 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
133 /* 4D M */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
134 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
135 /* 4E N */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
136 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
137 /* 4F O */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
138 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
139 /* 50 P */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
140 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
141 /* 51 Q */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
142 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
143 /* 52 R */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
144 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
145 /* 53 S */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
146 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
147 /* 54 T */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
148 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
149 /* 55 U */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
150 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
151 /* 56 V */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
152 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
153 /* 57 W */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
154 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
155 /* 58 X */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
156 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
157 /* 59 Y */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
158 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
159 /* 5A Z */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_upper
160 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
161 /* 5B [ */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
162 /* 5C \ */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
163 /* 5D ] */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
164 /* 5E ^ */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
165 /* 5F _ */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
166 /* 60 ` */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
167 /* 61 a */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
168 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
169 /* 62 b */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
170 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
171 /* 63 c */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
172 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
173 /* 64 d */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
174 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
175 /* 65 e */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
176 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
177 /* 66 f */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
178 | CTYPE_MASK_xdigit | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
179 /* 67 g */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
180 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
181 /* 68 h */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
182 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
183 /* 69 i */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
184 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
185 /* 6A j */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
186 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
187 /* 6B k */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
188 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
189 /* 6C l */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
190 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
191 /* 6D m */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
192 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
193 /* 6E n */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
194 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
195 /* 6F o */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
196 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
197 /* 70 p */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
198 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
199 /* 71 q */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
200 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
201 /* 72 r */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
202 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
203 /* 73 s */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
204 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
205 /* 74 t */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
206 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
207 /* 75 u */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
208 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
209 /* 76 v */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
210 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
211 /* 77 w */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
212 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
213 /* 78 x */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
214 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
215 /* 79 y */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
216 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
217 /* 7A z */ CTYPE_MASK_graph | CTYPE_MASK_lower | CTYPE_MASK_print
218 | CTYPE_MASK_base64 | CTYPE_MASK_asn1print,
219 /* 7B { */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
220 /* 7C | */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
221 /* 7D } */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
222 /* 7E ~ */ CTYPE_MASK_graph | CTYPE_MASK_print | CTYPE_MASK_punct,
223 /* 7F del */ CTYPE_MASK_cntrl
224 };
225
226 #ifdef CHARSET_EBCDIC
ossl_toascii(int c)227 int ossl_toascii(int c)
228 {
229 if (c < -128 || c > 256 || c == EOF)
230 return c;
231 /*
232 * Adjust negatively signed characters.
233 * This is not required for ASCII because any character that sign extends
234 * is not seven bit and all of the checks are on the seven bit characters.
235 * I.e. any check must fail on sign extension.
236 */
237 if (c < 0)
238 c += 256;
239 return os_toascii[c];
240 }
241
ossl_fromascii(int c)242 int ossl_fromascii(int c)
243 {
244 if (c < -128 || c > 256 || c == EOF)
245 return c;
246 if (c < 0)
247 c += 256;
248 return os_toebcdic[c];
249 }
250 #endif
251
ossl_ctype_check(int c,unsigned int mask)252 int ossl_ctype_check(int c, unsigned int mask)
253 {
254 const int max = sizeof(ctype_char_map) / sizeof(*ctype_char_map);
255 const int a = ossl_toascii(c);
256
257 return a >= 0 && a < max && (ctype_char_map[a] & mask) != 0;
258 }
259
260 /*
261 * Implement some of the simpler functions directly to avoid the overhead of
262 * accessing memory via ctype_char_map[].
263 */
264
265 #define ASCII_IS_DIGIT(c) (c >= 0x30 && c <= 0x39)
266 #define ASCII_IS_UPPER(c) (c >= 0x41 && c <= 0x5A)
267 #define ASCII_IS_LOWER(c) (c >= 0x61 && c <= 0x7A)
268
ossl_isdigit(int c)269 int ossl_isdigit(int c)
270 {
271 int a = ossl_toascii(c);
272
273 return ASCII_IS_DIGIT(a);
274 }
275
ossl_isupper(int c)276 int ossl_isupper(int c)
277 {
278 int a = ossl_toascii(c);
279
280 return ASCII_IS_UPPER(a);
281 }
282
ossl_islower(int c)283 int ossl_islower(int c)
284 {
285 int a = ossl_toascii(c);
286
287 return ASCII_IS_LOWER(a);
288 }
289
290 #if defined(CHARSET_EBCDIC) && !defined(CHARSET_EBCDIC_TEST)
291 static const int case_change = 0x40;
292 #else
293 static const int case_change = 0x20;
294 #endif
295
ossl_tolower(int c)296 int ossl_tolower(int c)
297 {
298 int a = ossl_toascii(c);
299
300 return ASCII_IS_UPPER(a) ? c ^ case_change : c;
301 }
302
ossl_toupper(int c)303 int ossl_toupper(int c)
304 {
305 int a = ossl_toascii(c);
306
307 return ASCII_IS_LOWER(a) ? c ^ case_change : c;
308 }
309
ossl_ascii_isdigit(int c)310 int ossl_ascii_isdigit(int c)
311 {
312 return ASCII_IS_DIGIT(c);
313 }
314
