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authorcvs2svn <admin@example.com>2002-03-12 00:05:45 +0000
committercvs2svn <admin@example.com>2002-03-12 00:05:45 +0000
commit3779f2f4a8b544a7e4c362915322726b66cff114 (patch)
treeb6d77e66cbfdf6c0d8953fba2917f26f86fa50f6 /src/lib/libcrypto/asn1/a_bitstr.c
parentf39945c2b3b0f9e4950384bdb8effdac6eed9199 (diff)
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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
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 len, ret;
75 len = i2c_ASN1_BIT_STRING(a, NULL);
76 ret=ASN1_object_size(0,len,V_ASN1_BIT_STRING);
77 if(pp) {
78 ASN1_put_object(pp,0,len,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL);
79 i2c_ASN1_BIT_STRING(a, pp);
80 }
81 return ret;
82}
83
84int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp)
85 {
86 int ret,j,bits,len;
87 unsigned char *p,*d;
88
89 if (a == NULL) return(0);
90
91 len=a->length;
92 ret=1+len;
93 if (pp == NULL) return(ret);
94
95 if (len > 0)
96 {
97 if (a->flags & ASN1_STRING_FLAG_BITS_LEFT)
98 {
99 bits=(int)a->flags&0x07;
100 }
101 else
102 {
103 for ( ; len > 0; len--)
104 {
105 if (a->data[len-1]) break;
106 }
107 j=a->data[len-1];
108 if (j & 0x01) bits=0;
109 else if (j & 0x02) bits=1;
110 else if (j & 0x04) bits=2;
111 else if (j & 0x08) bits=3;
112 else if (j & 0x10) bits=4;
113 else if (j & 0x20) bits=5;
114 else if (j & 0x40) bits=6;
115 else if (j & 0x80) bits=7;
116 else bits=0; /* should not happen */
117 }
118 }
119 else
120 bits=0;
121 p= *pp;
122
123 *(p++)=(unsigned char)bits;
124 d=a->data;
125 memcpy(p,d,len);
126 p+=len;
127 if (len > 0) p[-1]&=(0xff<<bits);
128 *pp=p;
129 return(ret);
130 }
131
132
133/* Convert DER encoded ASN1 BIT_STRING to ASN1_BIT_STRING structure */
134ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp,
135 long length)
136{
137 unsigned char *p;
138 long len;
139 int i;
140 int inf,tag,xclass;
141 ASN1_BIT_STRING *ret;
142
143 p= *pp;
144 inf=ASN1_get_object(&p,&len,&tag,&xclass,length);
145 if (inf & 0x80)
146 {
147 i=ASN1_R_BAD_OBJECT_HEADER;
148 goto err;
149 }
150
151 if (tag != V_ASN1_BIT_STRING)
152 {
153 i=ASN1_R_EXPECTING_A_BIT_STRING;
154 goto err;
155 }
156 if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; }
157 ret = c2i_ASN1_BIT_STRING(a, &p, len);
158 if(ret) *pp = p;
159 return ret;
160err:
161 ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
162 return(NULL);
163
164}
165
166ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, unsigned char **pp,
167 long len)
168 {
169 ASN1_BIT_STRING *ret=NULL;
170 unsigned char *p,*s;
171 int i;
172
173 if ((a == NULL) || ((*a) == NULL))
174 {
175 if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL);
176 }
177 else
178 ret=(*a);
179
180 p= *pp;
181 i= *(p++);
182 /* We do this to preserve the settings. If we modify
183 * the settings, via the _set_bit function, we will recalculate
184 * on output */
185 ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */
186 ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */
187
188 if (len-- > 1) /* using one because of the bits left byte */
189 {
190 s=(unsigned char *)OPENSSL_malloc((int)len);
191 if (s == NULL)
192 {
193 i=ERR_R_MALLOC_FAILURE;
194 goto err;
195 }
196 memcpy(s,p,(int)len);
197 s[len-1]&=(0xff<<i);
198 p+=len;
199 }
200 else
201 s=NULL;
202
203 ret->length=(int)len;
204 if (ret->data != NULL) OPENSSL_free(ret->data);
205 ret->data=s;
206 ret->type=V_ASN1_BIT_STRING;
207 if (a != NULL) (*a)=ret;
208 *pp=p;
209 return(ret);
210err:
211 ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i);
212 if ((ret != NULL) && ((a == NULL) || (*a != ret)))
213 M_ASN1_BIT_STRING_free(ret);
214 return(NULL);
215 }
216
217/* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de>
218 */
219int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value)
220 {
221 int w,v,iv;
222 unsigned char *c;
223
224 w=n/8;
225 v=1<<(7-(n&0x07));
226 iv= ~v;
227
228 a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */
229
230 if (a == NULL) return(0);
231 if ((a->length < (w+1)) || (a->data == NULL))
232 {
233 if (!value) return(1); /* Don't need to set */
234 if (a->data == NULL)
235 c=(unsigned char *)OPENSSL_malloc(w+1);
236 else
237 c=(unsigned char *)OPENSSL_realloc(a->data,w+1);
238 if (c == NULL) return(0);
239 if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length);
240 a->data=c;
241 a->length=w+1;
242 }
243 a->data[w]=((a->data[w])&iv)|v;
244 while ((a->length > 0) && (a->data[a->length-1] == 0))
245 a->length--;
246 return(1);
247 }
248
249int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n)
250 {
251 int w,v;
252
253 w=n/8;
254 v=1<<(7-(n&0x07));
255 if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL))
256 return(0);
257 return((a->data[w]&v) != 0);
258 }
259
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