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 <limits.h>
60#include <string.h>
61
62#include <openssl/err.h>
63#include <openssl/mem.h>
64
65#include "../internal.h"
66
67
68int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
69{
70 return M_ASN1_BIT_STRING_set(x, d, len);
71}
72
73int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
74{
75 int ret, j, bits, len;
76 unsigned char *p, *d;
77
78 if (a == NULL)
79 return (0);
80
81 len = a->length;
82
83 if (len > 0) {
84 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) {
85 bits = (int)a->flags & 0x07;
86 } else {
87 for (; len > 0; len--) {
88 if (a->data[len - 1])
89 break;
90 }
91 j = a->data[len - 1];
92 if (j & 0x01)
93 bits = 0;
94 else if (j & 0x02)
95 bits = 1;
96 else if (j & 0x04)
97 bits = 2;
98 else if (j & 0x08)
99 bits = 3;
100 else if (j & 0x10)
101 bits = 4;
102 else if (j & 0x20)
103 bits = 5;
104 else if (j & 0x40)
105 bits = 6;
106 else if (j & 0x80)
107 bits = 7;
108 else
109 bits = 0; /* should not happen */
110 }
111 } else
112 bits = 0;
113
114 ret = 1 + len;
115 if (pp == NULL)
116 return (ret);
117
118 p = *pp;
119
120 *(p++) = (unsigned char)bits;
121 d = a->data;
122 OPENSSL_memcpy(p, d, len);
123 p += len;
124 if (len > 0)
125 p[-1] &= (0xff << bits);
126 *pp = p;
127 return (ret);
128}
129
130ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
131 const unsigned char **pp, long len)
132{
133 ASN1_BIT_STRING *ret = NULL;
134 const unsigned char *p;
135 unsigned char *s;
136 int padding;
137
138 if (len < 1) {
139 OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_SHORT);
140 goto err;
141 }
142
143 if (len > INT_MAX) {
144 OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_LONG);
145 goto err;
146 }
147
148 if ((a == NULL) || ((*a) == NULL)) {
149 if ((ret = M_ASN1_BIT_STRING_new()) == NULL)
150 return (NULL);
151 } else
152 ret = (*a);
153
154 p = *pp;
155 padding = *(p++);
156 if (padding > 7) {
157 OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
158 goto err;
159 }
160
161 /*
162 * We do this to preserve the settings. If we modify the settings, via
163 * the _set_bit function, we will recalculate on output
164 */
165 ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */
166 ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | padding); /* set */
167
168 if (len-- > 1) { /* using one because of the bits left byte */
169 s = (unsigned char *)OPENSSL_malloc((int)len);
170 if (s == NULL) {
171 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
172 goto err;
173 }
174 OPENSSL_memcpy(s, p, (int)len);
175 s[len - 1] &= (0xff << padding);
176 p += len;
177 } else
178 s = NULL;
179
180 ret->length = (int)len;
181 if (ret->data != NULL)
182 OPENSSL_free(ret->data);
183 ret->data = s;
184 ret->type = V_ASN1_BIT_STRING;
185 if (a != NULL)
186 (*a) = ret;
187 *pp = p;
188 return (ret);
189 err:
190 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
191 M_ASN1_BIT_STRING_free(ret);
192 return (NULL);
193}
194
195/*
196 * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
197 */
198int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
199{
200 int w, v, iv;
201 unsigned char *c;
202
203 w = n / 8;
204 v = 1 << (7 - (n & 0x07));
205 iv = ~v;
206 if (!value)
207 v = 0;
208
209 if (a == NULL)
210 return 0;
211
212 a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */
213
214 if ((a->length < (w + 1)) || (a->data == NULL)) {
215 if (!value)
216 return (1); /* Don't need to set */
217 if (a->data == NULL)
218 c = (unsigned char *)OPENSSL_malloc(w + 1);
219 else
220 c = (unsigned char *)OPENSSL_realloc(a->data, w + 1);
221 if (c == NULL) {
222 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
223 return 0;
224 }
225 if (w + 1 - a->length > 0)
226 OPENSSL_memset(c + a->length, 0, w + 1 - a->length);
227 a->data = c;
228 a->length = w + 1;
229 }
230 a->data[w] = ((a->data[w]) & iv) | v;
231 while ((a->length > 0) && (a->data[a->length - 1] == 0))
232 a->length--;
233 return (1);
234}
235
236int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
237{
238 int w, v;
239
240 w = n / 8;
241 v = 1 << (7 - (n & 0x07));
242 if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL))
243 return (0);
244 return ((a->data[w] & v) != 0);
245}
246
247/*
248 * Checks if the given bit string contains only bits specified by
249 * the flags vector. Returns 0 if there is at least one bit set in 'a'
250 * which is not specified in 'flags', 1 otherwise.
251 * 'len' is the length of 'flags'.
252 */
253int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a,
254 unsigned char *flags, int flags_len)
255{
256 int i, ok;
257 /* Check if there is one bit set at all. */
258 if (!a || !a->data)
259 return 1;
260
261 /*
262 * Check each byte of the internal representation of the bit string.
263 */
264 ok = 1;
265 for (i = 0; i < a->length && ok; ++i) {
266 unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
267 /* We are done if there is an unneeded bit set. */
268 ok = (a->data[i] & mask) == 0;
269 }
270 return ok;
271}
272