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1/* $OpenBSD: a_bitstr.c,v 1.20 2014/07/11 08:44:47 jsing Exp $ */
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 <string.h>
61
62#include <openssl/asn1.h>
63#include <openssl/err.h>
64
65int
66ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
67{
68 return M_ASN1_BIT_STRING_set(x, d, len);
69}
70
71int
72i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
73{
74 int ret, j, bits, len;
75 unsigned char *p, *d;
76
77 if (a == NULL)
78 return (0);
79
80 len = a->length;
81
82 if (len > 0) {
83 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) {
84 bits = (int)a->flags & 0x07;
85 } else {
86 for (; len > 0; len--) {
87 if (a->data[len - 1])
88 break;
89 }
90 j = a->data[len - 1];
91 if (j & 0x01)
92 bits = 0;
93 else if (j & 0x02)
94 bits = 1;
95 else if (j & 0x04)
96 bits = 2;
97 else if (j & 0x08)
98 bits = 3;
99 else if (j & 0x10)
100 bits = 4;
101 else if (j & 0x20)
102 bits = 5;
103 else if (j & 0x40)
104 bits = 6;
105 else if (j & 0x80)
106 bits = 7;
107 else
108 bits = 0; /* should not happen */
109 }
110 } else
111 bits = 0;
112
113 ret = 1 + len;
114 if (pp == NULL)
115 return (ret);
116
117 p= *pp;
118
119 *(p++) = (unsigned char)bits;
120 d = a->data;
121 memcpy(p, d, len);
122 p += len;
123 if (len > 0)
124 p[-1]&=(0xff << bits);
125 *pp = p;
126 return (ret);
127}
128
129ASN1_BIT_STRING *
130c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, const unsigned char **pp, long len)
131{
132 ASN1_BIT_STRING *ret = NULL;
133 const unsigned char *p;
134 unsigned char *s;
135 int i;
136
137 if (len < 1) {
138 i = ASN1_R_STRING_TOO_SHORT;
139 goto err;
140 }
141
142 if ((a == NULL) || ((*a) == NULL)) {
143 if ((ret = M_ASN1_BIT_STRING_new()) == NULL)
144 return (NULL);
145 } else
146 ret = (*a);
147
148 p = *pp;
149 i = *(p++);
150 /* We do this to preserve the settings. If we modify
151 * the settings, via the _set_bit function, we will recalculate
152 * on output */
153 ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
154 ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */
155
156 if (len-- > 1) /* using one because of the bits left byte */
157 {
158 s = malloc((int)len);
159 if (s == NULL) {
160 i = ERR_R_MALLOC_FAILURE;
161 goto err;
162 }
163 memcpy(s, p, len);
164 s[len - 1] &= (0xff << i);
165 p += len;
166 } else
167 s = NULL;
168
169 ret->length = (int)len;
170 free(ret->data);
171 ret->data = s;
172 ret->type = V_ASN1_BIT_STRING;
173 if (a != NULL)
174 (*a) = ret;
175 *pp = p;
176 return (ret);
177
178err:
179 ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i);
180 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
181 M_ASN1_BIT_STRING_free(ret);
182 return (NULL);
183}
184
185/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
186 */
187int
188ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
189{
190 int w, v, iv;
191 unsigned char *c;
192
193 w = n/8;
194 v = 1 << (7 - (n & 0x07));
195 iv = ~v;
196 if (!value)
197 v = 0;
198
199 if (a == NULL)
200 return 0;
201
202 a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */
203
204 if ((a->length < (w + 1)) || (a->data == NULL)) {
205 if (!value)
206 return(1); /* Don't need to set */
207 c = OPENSSL_realloc_clean(a->data, a->length, w + 1);
208 if (c == NULL) {
209 ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT, ERR_R_MALLOC_FAILURE);
210 return 0;
211 }
212 if (w + 1 - a->length > 0)
213 memset(c + a->length, 0, w + 1 - a->length);
214 a->data = c;
215 a->length = w + 1;
216 }
217 a->data[w] = ((a->data[w]) & iv) | v;
218 while ((a->length > 0) && (a->data[a->length - 1] == 0))
219 a->length--;
220
221 return (1);
222}
223
224int
225ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
226{
227 int w, v;
228
229 w = n / 8;
230 v = 1 << (7 - (n & 0x07));
231 if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL))
232 return (0);
233 return ((a->data[w] & v) != 0);
234}
235
236/*
237 * Checks if the given bit string contains only bits specified by
238 * the flags vector. Returns 0 if there is at least one bit set in 'a'
239 * which is not specified in 'flags', 1 otherwise.
240 * 'len' is the length of 'flags'.
241 */
242int
243ASN1_BIT_STRING_check(ASN1_BIT_STRING *a, unsigned char *flags, int flags_len)
244{
245 int i, ok;
246
247 /* Check if there is one bit set at all. */
248 if (!a || !a->data)
249 return 1;
250
251 /* Check each byte of the internal representation of the bit string. */
252 ok = 1;
253 for (i = 0; i < a->length && ok; ++i) {
254 unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
255 /* We are done if there is an unneeded bit set. */
256 ok = (a->data[i] & mask) == 0;
257 }
258 return ok;
259}
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