]>
Commit | Line | Data |
---|---|---|
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" | |
ec577822 | 61 | #include <openssl/asn1.h> |
d02b48c6 | 62 | |
6343829a GT |
63 | int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) |
64 | { return M_ASN1_BIT_STRING_set(x, d, len); } | |
08e9c1af | 65 | |
a338e21b | 66 | int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) |
d02b48c6 | 67 | { |
6343829a | 68 | int ret,j,bits,len; |
d02b48c6 RE |
69 | unsigned char *p,*d; |
70 | ||
71 | if (a == NULL) return(0); | |
72 | ||
dfeab068 RE |
73 | len=a->length; |
74 | ||
75 | if (len > 0) | |
76 | { | |
77 | if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) | |
78 | { | |
79 | bits=(int)a->flags&0x07; | |
80 | } | |
81 | else | |
82 | { | |
83 | for ( ; len > 0; len--) | |
84 | { | |
85 | if (a->data[len-1]) break; | |
86 | } | |
87 | j=a->data[len-1]; | |
88 | if (j & 0x01) bits=0; | |
89 | else if (j & 0x02) bits=1; | |
90 | else if (j & 0x04) bits=2; | |
91 | else if (j & 0x08) bits=3; | |
92 | else if (j & 0x10) bits=4; | |
93 | else if (j & 0x20) bits=5; | |
94 | else if (j & 0x40) bits=6; | |
95 | else if (j & 0x80) bits=7; | |
96 | else bits=0; /* should not happen */ | |
97 | } | |
98 | } | |
99 | else | |
100 | bits=0; | |
08241a58 DSH |
101 | |
102 | ret=1+len; | |
103 | if (pp == NULL) return(ret); | |
104 | ||
d02b48c6 RE |
105 | p= *pp; |
106 | ||
dfeab068 | 107 | *(p++)=(unsigned char)bits; |
d02b48c6 | 108 | d=a->data; |
dfeab068 RE |
109 | memcpy(p,d,len); |
110 | p+=len; | |
111 | if (len > 0) p[-1]&=(0xff<<bits); | |
d02b48c6 | 112 | *pp=p; |
a338e21b | 113 | return(ret); |
d02b48c6 RE |
114 | } |
115 | ||
875a644a | 116 | ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, |
6343829a | 117 | const unsigned char **pp, long len) |
a338e21b DSH |
118 | { |
119 | ASN1_BIT_STRING *ret=NULL; | |
875a644a RL |
120 | const unsigned char *p; |
121 | unsigned char *s; | |
a338e21b | 122 | int i; |
d02b48c6 | 123 | |
41ab00be DSH |
124 | if (len < 1) |
125 | { | |
126 | i=ASN1_R_STRING_TOO_SHORT; | |
127 | goto err; | |
128 | } | |
129 | ||
a338e21b DSH |
130 | if ((a == NULL) || ((*a) == NULL)) |
131 | { | |
132 | if ((ret=M_ASN1_BIT_STRING_new()) == NULL) return(NULL); | |
133 | } | |
134 | else | |
135 | ret=(*a); | |
136 | ||
137 | p= *pp; | |
d02b48c6 | 138 | i= *(p++); |
dfeab068 RE |
139 | /* We do this to preserve the settings. If we modify |
140 | * the settings, via the _set_bit function, we will recalculate | |
141 | * on output */ | |
142 | ret->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear */ | |
143 | ret->flags|=(ASN1_STRING_FLAG_BITS_LEFT|(i&0x07)); /* set */ | |
144 | ||
d02b48c6 RE |
145 | if (len-- > 1) /* using one because of the bits left byte */ |
146 | { | |
6343829a | 147 | s=(unsigned char *)OPENSSL_malloc((int)len); |
d02b48c6 RE |
148 | if (s == NULL) |
149 | { | |
150 | i=ERR_R_MALLOC_FAILURE; | |
151 | goto err; | |
152 | } | |
6343829a | 153 | memcpy(s,p,(int)len); |
d02b48c6 RE |
154 | s[len-1]&=(0xff<<i); |
155 | p+=len; | |
156 | } | |
157 | else | |
158 | s=NULL; | |
159 | ||
160 | ret->length=(int)len; | |
26a3a48d | 161 | if (ret->data != NULL) OPENSSL_free(ret->data); |
d02b48c6 RE |
162 | ret->data=s; |
163 | ret->type=V_ASN1_BIT_STRING; | |
164 | if (a != NULL) (*a)=ret; | |
165 | *pp=p; | |
166 | return(ret); | |
167 | err: | |
aa4ce731 | 168 | ASN1err(ASN1_F_C2I_ASN1_BIT_STRING,i); |
d02b48c6 | 169 | if ((ret != NULL) && ((a == NULL) || (*a != ret))) |
08e9c1af | 170 | M_ASN1_BIT_STRING_free(ret); |
d02b48c6 RE |
171 | return(NULL); |
172 | } | |
173 | ||
58964a49 RE |
174 | /* These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> |
175 | */ | |
6343829a | 176 | int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) |
58964a49 | 177 | { |
6343829a | 178 | int w,v,iv; |
58964a49 RE |
179 | unsigned char *c; |
180 | ||
181 | w=n/8; | |
182 | v=1<<(7-(n&0x07)); | |
183 | iv= ~v; | |
b9a3ef4c | 184 | if (!value) v=0; |
58964a49 | 185 | |
c755c5fd NL |
186 | if (a == NULL) |
187 | return 0; | |
188 | ||
dfeab068 RE |
189 | a->flags&= ~(ASN1_STRING_FLAG_BITS_LEFT|0x07); /* clear, set on write */ |
190 | ||
58964a49 RE |
191 | if ((a->length < (w+1)) || (a->data == NULL)) |
192 | { | |
193 | if (!value) return(1); /* Don't need to set */ | |
194 | if (a->data == NULL) | |
6343829a | 195 | c=(unsigned char *)OPENSSL_malloc(w+1); |
58964a49 | 196 | else |
6343829a GT |
197 | c=(unsigned char *)OPENSSL_realloc_clean(a->data, |
198 | a->length, | |
199 | w+1); | |
a0e7c8ee DSH |
200 | if (c == NULL) |
201 | { | |
202 | ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT,ERR_R_MALLOC_FAILURE); | |
203 | return 0; | |
204 | } | |
205 | if (w+1-a->length > 0) memset(c+a->length, 0, w+1-a->length); | |
58964a49 RE |
206 | a->data=c; |
207 | a->length=w+1; | |
5584fa17 | 208 | } |
58964a49 RE |
209 | a->data[w]=((a->data[w])&iv)|v; |
210 | while ((a->length > 0) && (a->data[a->length-1] == 0)) | |
211 | a->length--; | |
212 | return(1); | |
213 | } | |
214 | ||
6343829a | 215 | int ASN1_BIT_STRING_get_bit(ASN1_BIT_STRING *a, int n) |
58964a49 RE |
216 | { |
217 | int w,v; | |
218 | ||
219 | w=n/8; | |
220 | v=1<<(7-(n&0x07)); | |
221 | if ((a == NULL) || (a->length < (w+1)) || (a->data == NULL)) | |
222 | return(0); | |
223 | return((a->data[w]&v) != 0); | |
224 | } | |
225 | ||
c7235be6 UM |
226 | /* |
227 | * Checks if the given bit string contains only bits specified by | |
228 | * the flags vector. Returns 0 if there is at least one bit set in 'a' | |
229 | * which is not specified in 'flags', 1 otherwise. | |
230 | * 'len' is the length of 'flags'. | |
231 | */ | |
232 | int ASN1_BIT_STRING_check(ASN1_BIT_STRING *a, | |
6343829a | 233 | unsigned char *flags, int flags_len) |
c7235be6 UM |
234 | { |
235 | int i, ok; | |
236 | /* Check if there is one bit set at all. */ | |
237 | if (!a || !a->data) return 1; | |
238 | ||
239 | /* Check each byte of the internal representation of the bit string. */ | |
240 | ok = 1; | |
241 | for (i = 0; i < a->length && ok; ++i) | |
242 | { | |
243 | unsigned char mask = i < flags_len ? ~flags[i] : 0xff; | |
244 | /* We are done if there is an unneeded bit set. */ | |
245 | ok = (a->data[i] & mask) == 0; | |
246 | } | |
247 | return ok; | |
248 | } |