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d02b48c6 | 1 | /* crypto/asn1/a_bitstr.c */ |
58964a49 | 2 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
d02b48c6 RE |
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 | ||
67 | int i2d_ASN1_BIT_STRING(a,pp) | |
68 | ASN1_BIT_STRING *a; | |
69 | unsigned char **pp; | |
70 | { | |
dfeab068 | 71 | int ret,j,r,bits,len; |
d02b48c6 RE |
72 | unsigned char *p,*d; |
73 | ||
74 | if (a == NULL) return(0); | |
75 | ||
dfeab068 RE |
76 | len=a->length; |
77 | ||
78 | if (len > 0) | |
79 | { | |
80 | if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) | |
81 | { | |
82 | bits=(int)a->flags&0x07; | |
83 | } | |
84 | else | |
85 | { | |
86 | for ( ; len > 0; len--) | |
87 | { | |
88 | if (a->data[len-1]) break; | |
89 | } | |
90 | j=a->data[len-1]; | |
91 | if (j & 0x01) bits=0; | |
92 | else if (j & 0x02) bits=1; | |
93 | else if (j & 0x04) bits=2; | |
94 | else if (j & 0x08) bits=3; | |
95 | else if (j & 0x10) bits=4; | |
96 | else if (j & 0x20) bits=5; | |
97 | else if (j & 0x40) bits=6; | |
98 | else if (j & 0x80) bits=7; | |
99 | else bits=0; /* should not happen */ | |
100 | } | |
101 | } | |
102 | else | |
103 | bits=0; | |
104 | ret=1+len; | |
d02b48c6 RE |
105 | r=ASN1_object_size(0,ret,V_ASN1_BIT_STRING); |
106 | if (pp == NULL) return(r); | |
107 | p= *pp; | |
108 | ||
109 | ASN1_put_object(&p,0,ret,V_ASN1_BIT_STRING,V_ASN1_UNIVERSAL); | |
dfeab068 | 110 | *(p++)=(unsigned char)bits; |
d02b48c6 | 111 | d=a->data; |
dfeab068 RE |
112 | memcpy(p,d,len); |
113 | p+=len; | |
114 | if (len > 0) p[-1]&=(0xff<<bits); | |
d02b48c6 RE |
115 | *pp=p; |
116 | return(r); | |
117 | } | |
118 | ||
119 | ASN1_BIT_STRING *d2i_ASN1_BIT_STRING(a, pp, length) | |
120 | ASN1_BIT_STRING **a; | |
121 | unsigned char **pp; | |
122 | long length; | |
123 | { | |
124 | ASN1_BIT_STRING *ret=NULL; | |
125 | unsigned char *p,*s; | |
126 | long len; | |
127 | int inf,tag,xclass; | |
128 | int i; | |
129 | ||
130 | if ((a == NULL) || ((*a) == NULL)) | |
131 | { | |
132 | if ((ret=ASN1_BIT_STRING_new()) == NULL) return(NULL); | |
133 | } | |
134 | else | |
135 | ret=(*a); | |
136 | ||
137 | p= *pp; | |
138 | inf=ASN1_get_object(&p,&len,&tag,&xclass,length); | |
139 | if (inf & 0x80) | |
140 | { | |
141 | i=ASN1_R_BAD_OBJECT_HEADER; | |
142 | goto err; | |
143 | } | |
144 | ||
145 | if (tag != V_ASN1_BIT_STRING) | |
146 | { | |
147 | i=ASN1_R_EXPECTING_A_BIT_STRING; | |
148 | goto err; | |
149 | } | |
150 | if (len < 1) { i=ASN1_R_STRING_TOO_SHORT; goto err; } | |
151 | ||
152 | i= *(p++); | |
dfeab068 RE |
153 | /* We do this to preserve the settings. If we modify |
154 | * the settings, via the _set_bit function, we will recalculate | |
155 | * on output */ | |
156 | ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */ | |
157 | ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */ | |
158 | ||
d02b48c6 RE |
159 | if (len-- > 1) /* using one because of the bits left byte */ |
160 | { | |
161 | s=(unsigned char *)Malloc((int)len); | |
162 | if (s == NULL) | |
163 | { | |
164 | i=ERR_R_MALLOC_FAILURE; | |
165 | goto err; | |
166 | } | |
167 | memcpy(s,p,(int)len); | |
168 | s[len-1]&=(0xff<<i); | |
169 | p+=len; | |
170 | } | |
171 | else | |
172 | s=NULL; | |
173 | ||
174 | ret->length=(int)len; | |
175 | if (ret->data != NULL) Free((char *)ret->data); | |
176 | ret->data=s; | |
177 | ret->type=V_ASN1_BIT_STRING; | |
178 | if (a != NULL) (*a)=ret; | |
179 | *pp=p; | |
180 | return(ret); | |
181 | err: | |
182 | ASN1err(ASN1_F_D2I_ASN1_BIT_STRING,i); | |
183 | if ((ret != NULL) && ((a == NULL) || (*a != ret))) | |
184 | ASN1_BIT_STRING_free(ret); | |
185 | return(NULL); | |
186 | } | |
187 | ||
58964a49 RE |
188 | /* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> |
189 | */ | |
190 | int ASN1_BIT_STRING_set_bit(a,n,value) | |
191 | ASN1_BIT_STRING *a; | |
192 | int n; | |
193 | int value; | |
194 | { | |
195 | int w,v,iv; | |
196 | unsigned char *c; | |
197 | ||
198 | w=n/8; | |
199 | v=1<<(7-(n&0x07)); | |
200 | iv= ~v; | |
201 | ||
dfeab068 RE |
202 | a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ |
203 | ||
58964a49 RE |
204 | if (a == NULL) return(0); |
205 | if ((a->length < (w+1)) || (a->data == NULL)) | |
206 | { | |
207 | if (!value) return(1); /* Don't need to set */ | |
208 | if (a->data == NULL) | |
209 | c=(unsigned char *)Malloc(w+1); | |
210 | else | |
211 | c=(unsigned char *)Realloc(a->data,w+1); | |
212 | if (c == NULL) return(0); | |
213 | a->data=c; | |
214 | a->length=w+1; | |
215 | c[w]=0; | |
216 | } | |
217 | a->data[w]=((a->data[w])&iv)|v; | |
218 | while ((a->length > 0) && (a->data[a->length-1] == 0)) | |
219 | a->length--; | |
220 | return(1); | |
221 | } | |
222 | ||
223 | int ASN1_BIT_STRING_get_bit(a,n) | |
224 | ASN1_BIT_STRING *a; | |
225 | int n; | |
226 | { | |
227 | int w,v; | |
228 | ||
229 | w=n/8; | |
230 | v=1<<(7-(n&0x07)); | |
231 | if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL)) | |
232 | return(0); | |
233 | return((a->data[w]&v) != 0); | |
234 | } | |
235 |