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 <string.h>
60
61 #include <openssl/err.h>
62 #include <openssl/mem.h>
63
64 #include "../internal.h"
65
66
ASN1_BIT_STRING_set(ASN1_BIT_STRING * x,unsigned char * d,int len)67 int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
68 {
69 return M_ASN1_BIT_STRING_set(x, d, len);
70 }
71
i2c_ASN1_BIT_STRING(ASN1_BIT_STRING * a,unsigned char ** pp)72 int i2c_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 OPENSSL_memcpy(p, d, len);
122 p += len;
123 if (len > 0)
124 p[-1] &= (0xff << bits);
125 *pp = p;
126 return (ret);
127 }
128
c2i_ASN1_BIT_STRING(ASN1_BIT_STRING ** a,const unsigned char ** pp,long len)129 ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
130 const unsigned char **pp, long len)
131 {
132 ASN1_BIT_STRING *ret = NULL;
133 const unsigned char *p;
134 unsigned char *s;
135 int padding;
136
137 if (len < 1) {
138 OPENSSL_PUT_ERROR(ASN1, 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 padding = *(p++);
150 if (padding > 7) {
151 OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
152 goto err;
153 }
154
155 /*
156 * We do this to preserve the settings. If we modify the settings, via
157 * the _set_bit function, we will recalculate on output
158 */
159 ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */
160 ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | padding); /* set */
161
162 if (len-- > 1) { /* using one because of the bits left byte */
163 s = (unsigned char *)OPENSSL_malloc((int)len);
164 if (s == NULL) {
165 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
166 goto err;
167 }
168 OPENSSL_memcpy(s, p, (int)len);
169 s[len - 1] &= (0xff << padding);
170 p += len;
171 } else
172 s = NULL;
173
174 ret->length = (int)len;
175 if (ret->data != NULL)
176 OPENSSL_free(ret->data);
177 ret->data = s;
178 ret->type = V_ASN1_BIT_STRING;
179 if (a != NULL)
180 (*a) = ret;
181 *pp = p;
182 return (ret);
183 err:
184 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
185 M_ASN1_BIT_STRING_free(ret);
186 return (NULL);
187 }
188
189 /*
190 * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
191 */
ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING * a,int n,int value)192 int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
193 {
194 int w, v, iv;
195 unsigned char *c;
196
197 w = n / 8;
198 v = 1 << (7 - (n & 0x07));
199 iv = ~v;
200 if (!value)
201 v = 0;
202
203 if (a == NULL)
204 return 0;
205
206 a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */
207
208 if ((a->length < (w + 1)) || (a->data == NULL)) {
209 if (!value)
210 return (1); /* Don't need to set */
211 if (a->data == NULL)
212 c = (unsigned char *)OPENSSL_malloc(w + 1);
213 else
214 c = (unsigned char *)OPENSSL_realloc_clean(a->data,
215 a->length, w + 1);
216 if (c == NULL) {
217 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
218 return 0;
219 }
220 if (w + 1 - a->length > 0)
221 OPENSSL_memset(c + a->length, 0, w + 1 - a->length);
222 a->data = c;
223 a->length = w + 1;
224 }
225 a->data[w] = ((a->data[w]) & iv) | v;
226 while ((a->length > 0) && (a->data[a->length - 1] == 0))
227 a->length--;
228 return (1);
229 }
230
ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING * a,int n)231 int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
232 {
233 int w, v;
234
235 w = n / 8;
236 v = 1 << (7 - (n & 0x07));
237 if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL))
238 return (0);
239 return ((a->data[w] & v) != 0);
240 }
241
242 /*
243 * Checks if the given bit string contains only bits specified by
244 * the flags vector. Returns 0 if there is at least one bit set in 'a'
245 * which is not specified in 'flags', 1 otherwise.
246 * 'len' is the length of 'flags'.
247 */
ASN1_BIT_STRING_check(ASN1_BIT_STRING * a,unsigned char * flags,int flags_len)248 int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a,
249 unsigned char *flags, int flags_len)
250 {
251 int i, ok;
252 /* Check if there is one bit set at all. */
253 if (!a || !a->data)
254 return 1;
255
256 /*
257 * Check each byte of the internal representation of the bit string.
258 */
259 ok = 1;
260 for (i = 0; i < a->length && ok; ++i) {
261 unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
262 /* We are done if there is an unneeded bit set. */
263 ok = (a->data[i] & mask) == 0;
264 }
265 return ok;
266 }
267