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 <stdlib.h>
61#include <string.h>
62#include <time.h>
63
64#if 0
65#include "cryptlib.h"
66#include <openssl/asn1.h>
67#else
68#include "cs-asn1.h"
69#endif
70
71int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len)
72{ return M_ASN1_BIT_STRING_set(x, d, len); }
73
74int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
75	{
76	int ret,j,bits,len;
77	unsigned char *p,*d;
78
79	if (a == NULL) return(0);
80
81	len=a->length;
82
83	if (len > 0)
84		{
85		if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
86			{
87			bits=(int)a->flags&0x07;
88			}
89		else
90			{
91			for ( ; len > 0; len--)
92				{
93				if (a->data[len-1]) break;
94				}
95			j=a->data[len-1];
96			if      (j & 0x01) bits=0;
97			else if (j & 0x02) bits=1;
98			else if (j & 0x04) bits=2;
99			else if (j & 0x08) bits=3;
100			else if (j & 0x10) bits=4;
101			else if (j & 0x20) bits=5;
102			else if (j & 0x40) bits=6;
103			else if (j & 0x80) bits=7;
104			else bits=0; /* should not happen */
105			}
106		}
107	else
108		bits=0;
109
110	ret=1+len;
111	if (pp == NULL) return(ret);
112
113	p= *pp;
114
115	*(p++)=(unsigned char)bits;
116	d=a->data;
117	memcpy(p,d,len);
118	p+=len;
119	if (len > 0) p[-1]&=(0xff<<bits);
120	*pp=p;
121	return(ret);
122	}
123
124ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a,
125	const unsigned char **pp, long len)
126	{
127	ASN1_BIT_STRING *ret=NULL;
128	const unsigned char *p;
129	unsigned char *s;
130	int i;
131
132	if (len < 1)
133		{
134		i=ASN1_R_STRING_TOO_SHORT;
135		goto err;
136		}
137
138	if ((a == NULL) || ((*a) == NULL))
139		{
140		if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL);
141		}
142	else
143		ret=(*a);
144
145	p= *pp;
146	i= *(p++);
147	/* We do this to preserve the settings.  If we modify
148	 * the settings, via the _set_bit function, we will recalculate
149	 * on output */
150	ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
151	ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */
152
153	if (len-- > 1) /* using one because of the bits left byte */
154		{
155		s=(unsigned char *)malloc((int)len);
156		if (s == NULL)
157			{
158			/* i=ERR_R_MALLOC_FAILURE; */
159			i=-1;
160			goto err;
161			}
162		memcpy(s,p,(int)len);
163		s[len-1]&=(0xff<<i);
164		p+=len;
165		}
166	else
167		s=NULL;
168
169	ret->length=(int)len;
170	if (ret->data != NULL) free(ret->data);
171	ret->data=s;
172	ret->type=V_ASN1_BIT_STRING;
173	if (a != NULL) (*a)=ret;
174	*pp=p;
175	return(ret);
176err:
177	/* ASN1err(ASN1_F_C2I_ASN1_BIT_STRING,i); */
178	if ((ret != NULL) && ((a == NULL) || (*a != ret)))
179		M_ASN1_BIT_STRING_free(ret);
180	return(NULL);
181	}
182
183/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
184 */
185int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
186	{
187	int w,v,iv;
188	unsigned char *c;
189
190	w=n/8;
191	v=1<<(7-(n&0x07));
192	iv= ~v;
193	if (!value) v=0;
194
195	if (a == NULL)
196		return 0;
197
198	a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
199
200	if ((a->length < (w+1)) || (a->data == NULL))
201		{
202		if (!value) return(1); /* Don't need to set */
203		if (a->data == NULL) {
204			c=(unsigned char *)malloc(w+1);
205		} else {
206			/* XXX
207			c=(unsigned char *)realloc_clean(a->data,
208								 a->length,
209								 w+1);
210			*/
211			c = (unsigned char *)realloc(a->data, w+1);
212		}
213		if (c == NULL)
214			{
215			/* ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT,ERR_R_MALLOC_FAILURE);*/
216			return 0;
217			}
218  		if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length);
219		a->data=c;
220		a->length=w+1;
221	}
222	a->data[w]=((a->data[w])&iv)|v;
223	while ((a->length > 0) && (a->data[a->length-1] == 0))
224		a->length--;
225	return(1);
226	}
227
228int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
229	{
230	int w,v;
231
232	w=n/8;
233	v=1<<(7-(n&0x07));
234	if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
235		return(0);
236	return((a->data[w]&v) != 0);
237	}
238
239