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authorcvs2svn <admin@example.com>1999-10-10 21:32:04 +0000
committercvs2svn <admin@example.com>1999-10-10 21:32:04 +0000
commit9b77a555b5e85a4473f23ac7342ddfb4d9ff309d (patch)
treedae5e50679bccd1ed8d7d4041fbb9f3d96bbc98c /src/lib/libcrypto/asn1/a_bitstr.c
parent3ef9529fbf0c1f8f1c9da1172e92ad3370d5fcfe (diff)
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diff --git a/src/lib/libcrypto/asn1/a_bitstr.c b/src/lib/libcrypto/asn1/a_bitstr.c
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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 <openssl/asn1.h>
62
63int i2d_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
64 {
65 int ret,j,r,bits,len;
66 unsigned char *p,*d;
67
68 if (a == NULL) return(0);
69
70 len=a->length;
71
72 if (len > 0)
73 {
74 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
75 {
76 bits=(int)a->flags&0x07;
77 }
78 else
79 {
80 for ( ; len > 0; len--)
81 {
82 if (a->data[len-1]) break;
83 }
84 j=a->data[len-1];
85 if (j & 0x01) bits=0;
86 else if (j & 0x02) bits=1;
87 else if (j & 0x04) bits=2;
88 else if (j & 0x08) bits=3;
89 else if (j & 0x10) bits=4;
90 else if (j & 0x20) bits=5;
91 else if (j & 0x40) bits=6;
92 else if (j & 0x80) bits=7;
93 else bits=0; /* should not happen */
94 }
95 }
96 else
97 bits=0;
98 ret=1+len;
99 r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING);
100 if (pp == NULL) return(r);
101 p= *pp;
102
103 ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
104 *(p++)=(unsigned char)bits;
105 d=a->data;
106 memcpy(p,d,len);
107 p+=len;
108 if (len > 0) p[-1]&=(0xff<<bits);
109 *pp=p;
110 return(r);
111 }
112
113ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp,
114 long length)
115 {
116 ASN1_BIT_STRING *ret=NULL;
117 unsigned char *p,*s;
118 long len;
119 int inf,tag,xclass;
120 int i;
121
122 if ((a == NULL) || ((*a) == NULL))
123 {
124 if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL);
125 }
126 else
127 ret=(*a);
128
129 p= *pp;
130 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
131 if (inf & 0x80)
132 {
133 i=ASN1_R_BAD_OBJECT_HEADER;
134 goto err;
135 }
136
137 if (tag != V_ASN1_BIT_STRING)
138 {
139 i=ASN1_R_EXPECTING_A_BIT_STRING;
140 goto err;
141 }
142 if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
143
144 i= *(p++);
145 /* We do this to preserve the settings. If we modify
146 * the settings, via the _set_bit function, we will recalculate
147 * on output */
148 ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
149 ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */
150
151 if (len-- > 1) /* using one because of the bits left byte */
152 {
153 s=(unsigned char *)Malloc((int)len);
154 if (s == NULL)
155 {
156 i=ERR_R_MALLOC_FAILURE;
157 goto err;
158 }
159 memcpy(s,p,(int)len);
160 s[len-1]&=(0xff<<i);
161 p+=len;
162 }
163 else
164 s=NULL;
165
166 ret->length=(int)len;
167 if (ret->data != NULL) Free((char *)ret->data);
168 ret->data=s;
169 ret->type=V_ASN1_BIT_STRING;
170 if (a != NULL) (*a)=ret;
171 *pp=p;
172 return(ret);
173err:
174 ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
175 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
176 ASN1_BIT_STRING_free(ret);
177 return(NULL);
178 }
179
180/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
181 */
182int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
183 {
184 int w,v,iv;
185 unsigned char *c;
186
187 w=n/8;
188 v=1<<(7-(n&0x07));
189 iv= ~v;
190
191 a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
192
193 if (a == NULL) return(0);
194 if ((a->length < (w+1)) || (a->data == NULL))
195 {
196 if (!value) return(1); /* Don't need to set */
197 if (a->data == NULL)
198 c=(unsigned char *)Malloc(w+1);
199 else
200 c=(unsigned char *)Realloc(a->data,w+1);
201 if (c == NULL) return(0);
202 a->data=c;
203 a->length=w+1;
204 c[w]=0;
205 }
206 a->data[w]=((a->data[w])&iv)|v;
207 while ((a->length > 0) && (a->data[a->length-1] == 0))
208 a->length--;
209 return(1);
210 }
211
212int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
213 {
214 int w,v;
215
216 w=n/8;
217 v=1<<(7-(n&0x07));
218 if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
219 return(0);
220 return((a->data[w]&v) != 0);
221 }
222
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