Line data Source code
1 : /* crypto/asn1/a_bitstr.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"
61 : #include <openssl/asn1.h>
62 :
63 0 : int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
64 : {
65 0 : return M_ASN1_BIT_STRING_set(x, d, len);
66 : }
67 :
68 5640 : int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
69 : {
70 : int ret, j, bits, len;
71 : unsigned char *p, *d;
72 :
73 5640 : if (a == NULL)
74 : return (0);
75 :
76 5640 : len = a->length;
77 :
78 5640 : if (len > 0) {
79 5640 : if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) {
80 5640 : bits = (int)a->flags & 0x07;
81 : } else {
82 0 : for (; len > 0; len--) {
83 0 : if (a->data[len - 1])
84 : break;
85 : }
86 0 : j = a->data[len - 1];
87 0 : if (j & 0x01)
88 : bits = 0;
89 0 : else if (j & 0x02)
90 : bits = 1;
91 0 : else if (j & 0x04)
92 : bits = 2;
93 0 : else if (j & 0x08)
94 : bits = 3;
95 0 : else if (j & 0x10)
96 : bits = 4;
97 0 : else if (j & 0x20)
98 : bits = 5;
99 0 : else if (j & 0x40)
100 : bits = 6;
101 0 : else if (j & 0x80)
102 : bits = 7;
103 : else
104 : bits = 0; /* should not happen */
105 : }
106 : } else
107 : bits = 0;
108 :
109 5640 : ret = 1 + len;
110 5640 : if (pp == NULL)
111 : return (ret);
112 :
113 1410 : p = *pp;
114 :
115 1410 : *(p++) = (unsigned char)bits;
116 1410 : d = a->data;
117 1410 : memcpy(p, d, len);
118 1410 : p += len;
119 1410 : if (len > 0)
120 1410 : p[-1] &= (0xff << bits);
121 1410 : *pp = p;
122 1410 : return (ret);
123 : }
124 :
125 4069 : ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
126 : const unsigned char **pp, long len)
127 : {
128 : ASN1_BIT_STRING *ret = NULL;
129 : const unsigned char *p;
130 : unsigned char *s;
131 : int i;
132 :
133 4069 : if (len < 1) {
134 : i = ASN1_R_STRING_TOO_SHORT;
135 : goto err;
136 : }
137 :
138 4069 : if ((a == NULL) || ((*a) == NULL)) {
139 707 : if ((ret = M_ASN1_BIT_STRING_new()) == NULL)
140 : return (NULL);
141 : } else
142 : ret = (*a);
143 :
144 4069 : p = *pp;
145 4069 : i = *(p++);
146 4069 : if (i > 7) {
147 : i = ASN1_R_INVALID_BIT_STRING_BITS_LEFT;
148 : goto err;
149 : }
150 : /*
151 : * We do this to preserve the settings. If we modify the settings, via
152 : * the _set_bit function, we will recalculate on output
153 : */
154 4069 : ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */
155 4069 : ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */
156 :
157 4069 : if (len-- > 1) { /* using one because of the bits left byte */
158 4069 : s = (unsigned char *)OPENSSL_malloc((int)len);
159 4069 : if (s == NULL) {
160 : i = ERR_R_MALLOC_FAILURE;
161 : goto err;
162 : }
163 4069 : memcpy(s, p, (int)len);
164 4069 : s[len - 1] &= (0xff << i);
165 4069 : p += len;
166 : } else
167 : s = NULL;
168 :
169 4069 : ret->length = (int)len;
170 4069 : if (ret->data != NULL)
171 0 : OPENSSL_free(ret->data);
172 4069 : ret->data = s;
173 4069 : ret->type = V_ASN1_BIT_STRING;
174 4069 : if (a != NULL)
175 4069 : (*a) = ret;
176 4069 : *pp = p;
177 4069 : return (ret);
178 : err:
179 0 : ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i);
180 0 : if ((ret != NULL) && ((a == NULL) || (*a != ret)))
181 0 : M_ASN1_BIT_STRING_free(ret);
182 : return (NULL);
183 : }
184 :
185 : /*
186 : * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
187 : */
188 0 : int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
189 : {
190 : int w, v, iv;
191 : unsigned char *c;
192 :
193 0 : w = n / 8;
194 0 : v = 1 << (7 - (n & 0x07));
195 0 : iv = ~v;
196 0 : if (!value)
197 : v = 0;
198 :
199 0 : if (a == NULL)
200 : return 0;
201 :
202 0 : a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */
203 :
204 0 : if ((a->length < (w + 1)) || (a->data == NULL)) {
205 0 : if (!value)
206 : return (1); /* Don't need to set */
207 0 : if (a->data == NULL)
208 0 : c = (unsigned char *)OPENSSL_malloc(w + 1);
209 : else
210 0 : c = (unsigned char *)OPENSSL_realloc_clean(a->data,
211 : a->length, w + 1);
212 0 : if (c == NULL) {
213 0 : ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT, ERR_R_MALLOC_FAILURE);
214 0 : return 0;
215 : }
216 0 : if (w + 1 - a->length > 0)
217 0 : memset(c + a->length, 0, w + 1 - a->length);
218 0 : a->data = c;
219 0 : a->length = w + 1;
220 : }
221 0 : a->data[w] = ((a->data[w]) & iv) | v;
222 0 : while ((a->length > 0) && (a->data[a->length - 1] == 0))
223 0 : a->length--;
224 : return (1);
225 : }
226 :
227 0 : int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
228 : {
229 : int w, v;
230 :
231 0 : w = n / 8;
232 0 : v = 1 << (7 - (n & 0x07));
233 0 : if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL))
234 : return (0);
235 0 : return ((a->data[w] & v) != 0);
236 : }
237 :
238 : /*
239 : * Checks if the given bit string contains only bits specified by
240 : * the flags vector. Returns 0 if there is at least one bit set in 'a'
241 : * which is not specified in 'flags', 1 otherwise.
242 : * 'len' is the length of 'flags'.
243 : */
244 0 : int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a,
245 : unsigned char *flags, int flags_len)
246 : {
247 : int i, ok;
248 : /* Check if there is one bit set at all. */
249 0 : if (!a || !a->data)
250 : return 1;
251 :
252 : /*
253 : * Check each byte of the internal representation of the bit string.
254 : */
255 : ok = 1;
256 0 : for (i = 0; i < a->length && ok; ++i) {
257 0 : unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
258 : /* We are done if there is an unneeded bit set. */
259 0 : ok = (a->data[i] & mask) == 0;
260 : }
261 : return ok;
262 : }
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