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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. | |
0f113f3e | 8 | * |
d02b48c6 RE |
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). | |
0f113f3e | 15 | * |
d02b48c6 RE |
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. | |
0f113f3e | 22 | * |
d02b48c6 RE |
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 :-). | |
0f113f3e | 37 | * 4. If you include any Windows specific code (or a derivative thereof) from |
d02b48c6 RE |
38 | * the apps directory (application code) you must include an acknowledgement: |
39 | * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" | |
0f113f3e | 40 | * |
d02b48c6 RE |
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. | |
0f113f3e | 52 | * |
d02b48c6 RE |
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> | |
b39fc560 | 60 | #include "internal/cryptlib.h" |
ec577822 | 61 | #include <openssl/asn1.h> |
c315a547 | 62 | #include "asn1_locl.h" |
d02b48c6 | 63 | |
6343829a | 64 | int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) |
0f113f3e | 65 | { |
f422a514 | 66 | return ASN1_STRING_set(x, d, len); |
0f113f3e | 67 | } |
08e9c1af | 68 | |
a338e21b | 69 | int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) |
0f113f3e MC |
70 | { |
71 | int ret, j, bits, len; | |
72 | unsigned char *p, *d; | |
73 | ||
74 | if (a == NULL) | |
75 | return (0); | |
76 | ||
77 | len = a->length; | |
78 | ||
79 | if (len > 0) { | |
80 | if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) { | |
81 | bits = (int)a->flags & 0x07; | |
82 | } else { | |
83 | for (; len > 0; len--) { | |
84 | if (a->data[len - 1]) | |
85 | break; | |
86 | } | |
87 | j = a->data[len - 1]; | |
88 | if (j & 0x01) | |
89 | bits = 0; | |
90 | else if (j & 0x02) | |
91 | bits = 1; | |
92 | else if (j & 0x04) | |
93 | bits = 2; | |
94 | else if (j & 0x08) | |
95 | bits = 3; | |
96 | else if (j & 0x10) | |
97 | bits = 4; | |
98 | else if (j & 0x20) | |
99 | bits = 5; | |
100 | else if (j & 0x40) | |
101 | bits = 6; | |
102 | else if (j & 0x80) | |
103 | bits = 7; | |
104 | else | |
105 | bits = 0; /* should not happen */ | |
106 | } | |
107 | } else | |
108 | bits = 0; | |
109 | ||
110 | ret = 1 + len; | |
111 | if (pp == NULL) | |
112 | return (ret); | |
113 | ||
114 | p = *pp; | |
115 | ||
116 | *(p++) = (unsigned char)bits; | |
117 | d = a->data; | |
118 | memcpy(p, d, len); | |
119 | p += len; | |
120 | if (len > 0) | |
121 | p[-1] &= (0xff << bits); | |
122 | *pp = p; | |
123 | return (ret); | |
124 | } | |
d02b48c6 | 125 | |
875a644a | 126 | ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, |
0f113f3e MC |
127 | const unsigned char **pp, long len) |
128 | { | |
129 | ASN1_BIT_STRING *ret = NULL; | |
130 | const unsigned char *p; | |
131 | unsigned char *s; | |
132 | int i; | |
133 | ||
134 | if (len < 1) { | |
135 | i = ASN1_R_STRING_TOO_SHORT; | |
136 | goto err; | |
137 | } | |
138 | ||
139 | if ((a == NULL) || ((*a) == NULL)) { | |
f422a514 | 140 | if ((ret = ASN1_BIT_STRING_new()) == NULL) |
0f113f3e MC |
141 | return (NULL); |
142 | } else | |
143 | ret = (*a); | |
144 | ||
145 | p = *pp; | |
146 | i = *(p++); | |
147 | if (i > 7) { | |
148 | i = ASN1_R_INVALID_BIT_STRING_BITS_LEFT; | |
149 | goto err; | |
150 | } | |
151 | /* | |
152 | * We do this to preserve the settings. If we modify the settings, via | |
153 | * the _set_bit function, we will recalculate on output | |
154 | */ | |
155 | ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */ | |
156 | ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */ | |
157 | ||
158 | if (len-- > 1) { /* using one because of the bits left byte */ | |
b196e7d9 | 159 | s = OPENSSL_malloc((int)len); |
0f113f3e MC |
160 | if (s == NULL) { |
161 | i = ERR_R_MALLOC_FAILURE; | |
162 | goto err; | |
163 | } | |
164 | memcpy(s, p, (int)len); | |
165 | s[len - 1] &= (0xff << i); | |
166 | p += len; | |
167 | } else | |
168 | s = NULL; | |
169 | ||
170 | ret->length = (int)len; | |
b548a1f1 | 171 | OPENSSL_free(ret->data); |
0f113f3e MC |
172 | ret->data = s; |
173 | ret->type = V_ASN1_BIT_STRING; | |
174 | if (a != NULL) | |
175 | (*a) = ret; | |
176 | *pp = p; | |
177 | return (ret); | |
178 | err: | |
179 | ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i); | |
0dfb9398 | 180 | if ((a == NULL) || (*a != ret)) |
f422a514 | 181 | ASN1_BIT_STRING_free(ret); |
0f113f3e MC |
182 | return (NULL); |
183 | } | |
184 | ||
185 | /* | |
186 | * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> | |
58964a49 | 187 | */ |
6343829a | 188 | int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) |
0f113f3e MC |
189 | { |
190 | int w, v, iv; | |
191 | unsigned char *c; | |
192 | ||
193 | w = n / 8; | |
194 | v = 1 << (7 - (n & 0x07)); | |
195 | iv = ~v; | |
196 | if (!value) | |
197 | v = 0; | |
198 | ||
199 | if (a == NULL) | |
200 | return 0; | |
201 | ||
202 | a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */ | |
203 | ||
204 | if ((a->length < (w + 1)) || (a->data == NULL)) { | |
205 | if (!value) | |
206 | return (1); /* Don't need to set */ | |
2d29e2df | 207 | c = OPENSSL_realloc_clean(a->data, a->length, w + 1); |
0f113f3e MC |
208 | if (c == NULL) { |
209 | ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT, ERR_R_MALLOC_FAILURE); | |
210 | return 0; | |
211 | } | |
212 | if (w + 1 - a->length > 0) | |
213 | memset(c + a->length, 0, w + 1 - a->length); | |
214 | a->data = c; | |
215 | a->length = w + 1; | |
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 | } | |
58964a49 | 222 | |
f756fb43 | 223 | int ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING *a, int n) |
0f113f3e MC |
224 | { |
225 | int w, v; | |
58964a49 | 226 | |
0f113f3e MC |
227 | w = n / 8; |
228 | v = 1 << (7 - (n & 0x07)); | |
229 | if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL)) | |
230 | return (0); | |
231 | return ((a->data[w] & v) != 0); | |
232 | } | |
58964a49 | 233 | |
c7235be6 | 234 | /* |
0f113f3e | 235 | * Checks if the given bit string contains only bits specified by |
c7235be6 UM |
236 | * the flags vector. Returns 0 if there is at least one bit set in 'a' |
237 | * which is not specified in 'flags', 1 otherwise. | |
238 | * 'len' is the length of 'flags'. | |
239 | */ | |
f756fb43 | 240 | int ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a, |
0f113f3e MC |
241 | const unsigned char *flags, int flags_len) |
242 | { | |
243 | int i, ok; | |
244 | /* Check if there is one bit set at all. */ | |
245 | if (!a || !a->data) | |
246 | return 1; | |
247 | ||
248 | /* | |
249 | * Check each byte of the internal representation of the bit string. | |
250 | */ | |
251 | ok = 1; | |
252 | for (i = 0; i < a->length && ok; ++i) { | |
253 | unsigned char mask = i < flags_len ? ~flags[i] : 0xff; | |
254 | /* We are done if there is an unneeded bit set. */ | |
255 | ok = (a->data[i] & mask) == 0; | |
256 | } | |
257 | return ok; | |
258 | } |