1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
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)"
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
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.] */
57 #include <openssl/asn1.h>
62 #include <openssl/err.h>
63 #include <openssl/mem.h>
65 #include "../internal.h"
68 int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
70 return M_ASN1_BIT_STRING_set(x, d, len);
73 int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
75 int ret, j, bits, len;
84 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) {
85 bits = (int)a->flags & 0x07;
87 for (; len > 0; len--) {
109 bits = 0; /* should not happen */
120 *(p++) = (unsigned char)bits;
122 OPENSSL_memcpy(p, d, len);
125 p[-1] &= (0xff << bits);
130 ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
131 const unsigned char **pp, long len)
133 ASN1_BIT_STRING *ret = NULL;
134 const unsigned char *p;
139 OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_SHORT);
144 OPENSSL_PUT_ERROR(ASN1, ASN1_R_STRING_TOO_LONG);
148 if ((a == NULL) || ((*a) == NULL)) {
149 if ((ret = M_ASN1_BIT_STRING_new()) == NULL)
157 OPENSSL_PUT_ERROR(ASN1, ASN1_R_INVALID_BIT_STRING_BITS_LEFT);
162 * We do this to preserve the settings. If we modify the settings, via
163 * the _set_bit function, we will recalculate on output
165 ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */
166 ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | padding); /* set */
168 if (len-- > 1) { /* using one because of the bits left byte */
169 s = (unsigned char *)OPENSSL_malloc((int)len);
171 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
174 OPENSSL_memcpy(s, p, (int)len);
175 s[len - 1] &= (0xff << padding);
180 ret->length = (int)len;
181 if (ret->data != NULL)
182 OPENSSL_free(ret->data);
184 ret->type = V_ASN1_BIT_STRING;
190 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
191 M_ASN1_BIT_STRING_free(ret);
196 * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
198 int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
204 v = 1 << (7 - (n & 0x07));
212 a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */
214 if ((a->length < (w + 1)) || (a->data == NULL)) {
216 return (1); /* Don't need to set */
218 c = (unsigned char *)OPENSSL_malloc(w + 1);
220 c = (unsigned char *)OPENSSL_realloc(a->data, w + 1);
222 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
225 if (w + 1 - a->length > 0)
226 OPENSSL_memset(c + a->length, 0, w + 1 - a->length);
230 a->data[w] = ((a->data[w]) & iv) | v;
231 while ((a->length > 0) && (a->data[a->length - 1] == 0))
236 int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
241 v = 1 << (7 - (n & 0x07));
242 if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL))
244 return ((a->data[w] & v) != 0);
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'.
253 int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a,
254 unsigned char *flags, int flags_len)
257 /* Check if there is one bit set at all. */
262 * Check each byte of the internal representation of the bit string.
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;