a_bitstr.c revision 59191 
1/* crypto/asn1/a_bitstr.c */
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 "cryptlib.h"
61#include <openssl/asn1.h>
62
63ASN1_BIT_STRING *ASN1_BIT_STRING_new(void)
64{ return M_ASN1_BIT_STRING_new(); }
65
66void ASN1_BIT_STRING_free(ASN1_BIT_STRING *x)
67{ M_ASN1_BIT_STRING_free(x); }
68
69int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
70{ return M_ASN1_BIT_STRING_set(x, d, len); }
71
72int i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
73	{
74	int ret,j,r,bits,len;
75	unsigned char *p,*d;
76
77	if (a == NULL) return(0);
78
79	len=a->length;
80
81	if (len > 0)
82		{
83		if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
84			{
85			bits=(int)a->flags&0x07;
86			}
87		else
88			{
89			for ( ; len > 0; len--)
90				{
91				if (a->data[len-1]) break;
92				}
93			j=a->data[len-1];
94			if      (j & 0x01) bits=0;
95			else if (j & 0x02) bits=1;
96			else if (j & 0x04) bits=2;
97			else if (j & 0x08) bits=3;
98			else if (j & 0x10) bits=4;
99			else if (j & 0x20) bits=5;
100			else if (j & 0x40) bits=6;
101			else if (j & 0x80) bits=7;
102			else bits=0; /* should not happen */
103			}
104		}
105	else
106		bits=0;
107	ret=1+len;
108	r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
109	if (pp == NULL) return(r);
110	p= *pp;
111
112	ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
113	*(p++)=(unsigned char)bits;
114	d=a->data;
115	memcpy(p,d,len);
116	p+=len;
117	if (len > 0) p[-1]&=(0xff<<bits);
118	*pp=p;
119	return(r);
120	}
121
122ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp,
123	     long length)
124	{
125	ASN1_BIT_STRING *ret=NULL;
126	unsigned char *p,*s;
127	long len;
128	int inf,tag,xclass;
129	int i;
130
131	if ((a == NULL) || ((*a) == NULL))
132		{
133		if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL);
134		}
135	else
136		ret=(*a);
137
138	p= *pp;
139	inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
140	if (inf & 0x80)
141		{
142		i=ASN1_R_BAD_OBJECT_HEADER;
143		goto err;
144		}
145
146	if (tag != V_ASN1_BIT_STRING)
147		{
148		i=ASN1_R_EXPECTING_A_BIT_STRING;
149		goto err;
150		}
151	if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
152
153	i= *(p++);
154	/* We do this to preserve the settings.  If we modify
155	 * the settings, via the _set_bit function, we will recalculate
156	 * on output */
157	ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
158	ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */
159
160	if (len-- > 1) /* using one because of the bits left byte */
161		{
162		s=(unsigned char *)Malloc((int)len);
163		if (s == NULL)
164			{
165			i=ERR_R_MALLOC_FAILURE;
166			goto err;
167			}
168		memcpy(s,p,(int)len);
169		s[len-1]&=(0xff<<i);
170		p+=len;
171		}
172	else
173		s=NULL;
174
175	ret->length=(int)len;
176	if (ret->data != NULL) Free(ret->data);
177	ret->data=s;
178	ret->type=V_ASN1_BIT_STRING;
179	if (a != NULL) (*a)=ret;
180	*pp=p;
181	return(ret);
182err:
183	ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
184	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
185		M_ASN1_BIT_STRING_free(ret);
186	return(NULL);
187	}
188
189/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
190 */
191int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
192	{
193	int w,v,iv;
194	unsigned char *c;
195
196	w=n/8;
197	v=1<<(7-(n&0x07));
198	iv= ~v;
199
200	a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
201
202	if (a == NULL) return(0);
203	if ((a->length < (w+1)) || (a->data == NULL))
204		{
205		if (!value) return(1); /* Don't need to set */
206		if (a->data == NULL)
207			c=(unsigned char *)Malloc(w+1);
208		else
209			c=(unsigned char *)Realloc(a->data,w+1);
210		if (c == NULL) return(0);
211		a->data=c;
212		a->length=w+1;
213		c[w]=0;
214		}
215	a->data[w]=((a->data[w])&iv)|v;
216	while ((a->length > 0) && (a->data[a->length-1] == 0))
217		a->length--;
218	return(1);
219	}
220
221int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
222	{
223	int w,v;
224
225	w=n/8;
226	v=1<<(7-(n&0x07));
227	if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
228		return(0);
229	return((a->data[w]&v) != 0);
230	}
231
232