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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 "asn1.h"
62
63/* ASN1err(ASN1_F_ASN1_STRING_NEW,ASN1_R_STRING_TOO_SHORT);
64 * ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,ASN1_R_EXPECTING_A_BIT_STRING);
65 */
66
67int i2d_ASN1_BIT_STRING(a,pp)
68ASN1_BIT_STRING *a;
69unsigned char **pp;
70 {
71 int ret,j,r,bits;
72 unsigned char *p,*d;
73
74 if (a == NULL) return(0);
75
76 /* our bit strings are always a multiple of 8 :-) */
77 bits=0;
78 ret=1+a->length;
79 r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
80 if (pp == NULL) return(r);
81 p= *pp;
82
83 ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
84 if (bits == 0)
85 j=0;
86 else j=8-bits;
87 *(p++)=(unsigned char)j;
88 d=a->data;
89 memcpy(p,d,a->length);
90 p+=a->length;
91 if (a->length > 0) p[-1]&=(0xff<<j);
92 *pp=p;
93 return(r);
94 }
95
96ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(a, pp, length)
97ASN1_BIT_STRING **a;
98unsigned char **pp;
99long length;
100 {
101 ASN1_BIT_STRING *ret=NULL;
102 unsigned char *p,*s;
103 long len;
104 int inf,tag,xclass;
105 int i;
106
107 if ((a == NULL) || ((*a) == NULL))
108 {
109 if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL);
110 }
111 else
112 ret=(*a);
113
114 p= *pp;
115 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
116 if (inf & 0x80)
117 {
118 i=ASN1_R_BAD_OBJECT_HEADER;
119 goto err;
120 }
121
122 if (tag != V_ASN1_BIT_STRING)
123 {
124 i=ASN1_R_EXPECTING_A_BIT_STRING;
125 goto err;
126 }
127 if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
128
129 i= *(p++);
130 if (len-- > 1) /* using one because of the bits left byte */
131 {
132 s=(unsigned char *)Malloc((int)len);
133 if (s == NULL)
134 {
135 i=ERR_R_MALLOC_FAILURE;
136 goto err;
137 }
138 memcpy(s,p,(int)len);
139 s[len-1]&=(0xff<<i);
140 p+=len;
141 }
142 else
143 s=NULL;
144
145 ret->length=(int)len;
146 if (ret->data != NULL) Free((char *)ret->data);
147 ret->data=s;
148 ret->type=V_ASN1_BIT_STRING;
149 if (a != NULL) (*a)=ret;
150 *pp=p;
151 return(ret);
152err:
153 ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
154 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
155 ASN1_BIT_STRING_free(ret);
156 return(NULL);
157 }
158
159/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
160 */
161int ASN1_BIT_STRING_set_bit(a,n,value)
162ASN1_BIT_STRING *a;
163int n;
164int value;
165 {
166 int w,v,iv;
167 unsigned char *c;
168
169 w=n/8;
170 v=1<<(7-(n&0x07));
171 iv= ~v;
172
173 if (a == NULL) return(0);
174 if ((a->length < (w+1)) || (a->data == NULL))
175 {
176 if (!value) return(1); /* Don't need to set */
177 if (a->data == NULL)
178 c=(unsigned char *)Malloc(w+1);
179 else
180 c=(unsigned char *)Realloc(a->data,w+1);
181 if (c == NULL) return(0);
182 a->data=c;
183 a->length=w+1;
184 c[w]=0;
185 }
186 a->data[w]=((a->data[w])&iv)|v;
187 while ((a->length > 0) && (a->data[a->length-1] == 0))
188 a->length--;
189 return(1);
190 }
191
192int ASN1_BIT_STRING_get_bit(a,n)
193ASN1_BIT_STRING *a;
194int n;
195 {
196 int w,v;
197
198 w=n/8;
199 v=1<<(7-(n&0x07));
200 if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
201 return(0);
202 return((a->data[w]&v) != 0);
203 }
204
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