1 /* crypto/asn1/a_bitstr.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 #include <openssl/asn1.h>
63 int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
65 return M_ASN1_BIT_STRING_set(x, d, len);
68 int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
70 int ret, j, bits, len;
79 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) {
80 bits = (int)a->flags & 0x07;
82 for (; len > 0; len--) {
104 bits = 0; /* should not happen */
115 *(p++) = (unsigned char)bits;
120 p[-1] &= (0xff << bits);
125 ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
126 const unsigned char **pp, long len)
128 ASN1_BIT_STRING *ret = NULL;
129 const unsigned char *p;
134 i = ASN1_R_STRING_TOO_SHORT;
138 if ((a == NULL) || ((*a) == NULL)) {
139 if ((ret = M_ASN1_BIT_STRING_new()) == NULL)
147 i = ASN1_R_INVALID_BIT_STRING_BITS_LEFT;
151 * We do this to preserve the settings. If we modify the settings, via
152 * the _set_bit function, we will recalculate on output
154 ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */
155 ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */
157 if (len-- > 1) { /* using one because of the bits left byte */
158 s = (unsigned char *)OPENSSL_malloc((int)len);
160 i = ERR_R_MALLOC_FAILURE;
163 memcpy(s, p, (int)len);
164 s[len - 1] &= (0xff << i);
169 ret->length = (int)len;
170 if (ret->data != NULL)
171 OPENSSL_free(ret->data);
173 ret->type = V_ASN1_BIT_STRING;
179 ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i);
180 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
181 M_ASN1_BIT_STRING_free(ret);
186 * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
188 int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
194 v = 1 << (7 - (n & 0x07));
202 a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */
204 if ((a->length < (w + 1)) || (a->data == NULL)) {
206 return (1); /* Don't need to set */
208 c = (unsigned char *)OPENSSL_malloc(w + 1);
210 c = (unsigned char *)OPENSSL_realloc_clean(a->data,
213 ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT, ERR_R_MALLOC_FAILURE);
216 if (w + 1 - a->length > 0)
217 memset(c + a->length, 0, w + 1 - a->length);
221 a->data[w] = ((a->data[w]) & iv) | v;
222 while ((a->length > 0) && (a->data[a->length - 1] == 0))
227 int ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING *a, int n)
232 v = 1 << (7 - (n & 0x07));
233 if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL))
235 return ((a->data[w] & v) != 0);
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'.
244 int ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a,
245 const unsigned char *flags, int flags_len)
248 /* Check if there is one bit set at all. */
253 * Check each byte of the internal representation of the bit string.
256 for (i = 0; i < a->length && ok; ++i) {
257 unsigned char mask = i < flags_len ? ~flags[i] : 0xff;
258 /* We are done if there is an unneeded bit set. */
259 ok = (a->data[i] & mask) == 0;