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>
62 #include "asn1_locl.h"
64 int ASN1_BIT_STRING_set(ASN1_BIT_STRING
*x
, unsigned char *d
, int len
)
66 return ASN1_STRING_set(x
, d
, len
);
69 int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING
*a
, unsigned char **pp
)
71 int ret
, j
, bits
, len
;
80 if (a
->flags
& ASN1_STRING_FLAG_BITS_LEFT
) {
81 bits
= (int)a
->flags
& 0x07;
83 for (; len
> 0; len
--) {
105 bits
= 0; /* should not happen */
116 *(p
++) = (unsigned char)bits
;
121 p
[-1] &= (0xff << bits
);
126 ASN1_BIT_STRING
*c2i_ASN1_BIT_STRING(ASN1_BIT_STRING
**a
,
127 const unsigned char **pp
, long len
)
129 ASN1_BIT_STRING
*ret
= NULL
;
130 const unsigned char *p
;
135 i
= ASN1_R_STRING_TOO_SHORT
;
139 if ((a
== NULL
) || ((*a
) == NULL
)) {
140 if ((ret
= ASN1_BIT_STRING_new()) == NULL
)
148 i
= ASN1_R_INVALID_BIT_STRING_BITS_LEFT
;
152 * We do this to preserve the settings. If we modify the settings, via
153 * the _set_bit function, we will recalculate on output
155 ret
->flags
&= ~(ASN1_STRING_FLAG_BITS_LEFT
| 0x07); /* clear */
156 ret
->flags
|= (ASN1_STRING_FLAG_BITS_LEFT
| i
); /* set */
158 if (len
-- > 1) { /* using one because of the bits left byte */
159 s
= OPENSSL_malloc((int)len
);
161 i
= ERR_R_MALLOC_FAILURE
;
164 memcpy(s
, p
, (int)len
);
165 s
[len
- 1] &= (0xff << i
);
170 ret
->length
= (int)len
;
171 OPENSSL_free(ret
->data
);
173 ret
->type
= V_ASN1_BIT_STRING
;
179 ASN1err(ASN1_F_C2I_ASN1_BIT_STRING
, i
);
180 if ((a
== NULL
) || (*a
!= ret
))
181 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 */
207 c
= OPENSSL_realloc_clean(a
->data
, a
->length
, w
+ 1);
209 ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT
, ERR_R_MALLOC_FAILURE
);
212 if (w
+ 1 - a
->length
> 0)
213 memset(c
+ a
->length
, 0, w
+ 1 - a
->length
);
217 a
->data
[w
] = ((a
->data
[w
]) & iv
) | v
;
218 while ((a
->length
> 0) && (a
->data
[a
->length
- 1] == 0))
223 int ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING
*a
, int n
)
228 v
= 1 << (7 - (n
& 0x07));
229 if ((a
== NULL
) || (a
->length
< (w
+ 1)) || (a
->data
== NULL
))
231 return ((a
->data
[w
] & v
) != 0);
235 * Checks if the given bit string contains only bits specified by
236 * the flags vector. Returns 0 if there is at least one bit set in 'a'
237 * which is not specified in 'flags', 1 otherwise.
238 * 'len' is the length of 'flags'.
240 int ASN1_BIT_STRING_check(const ASN1_BIT_STRING
*a
,
241 const unsigned char *flags
, int flags_len
)
244 /* Check if there is one bit set at all. */
249 * Check each byte of the internal representation of the bit string.
252 for (i
= 0; i
< a
->length
&& ok
; ++i
) {
253 unsigned char mask
= i
< flags_len
? ~flags
[i
] : 0xff;
254 /* We are done if there is an unneeded bit set. */
255 ok
= (a
->data
[i
] & mask
) == 0;