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2039c421 RS |
1 | /* |
2 | * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved. | |
d02b48c6 | 3 | * |
2039c421 RS |
4 | * Licensed under the OpenSSL license (the "License"). You may not use |
5 | * this file except in compliance with the License. You can obtain a copy | |
6 | * in the file LICENSE in the source distribution or at | |
7 | * https://www.openssl.org/source/license.html | |
d02b48c6 RE |
8 | */ |
9 | ||
10 | #include <stdio.h> | |
b39fc560 | 11 | #include "internal/cryptlib.h" |
ec577822 | 12 | #include <openssl/asn1.h> |
c315a547 | 13 | #include "asn1_locl.h" |
d02b48c6 | 14 | |
6343829a | 15 | int ASN1_BIT_STRING_set(ASN1_BIT_STRING *x, unsigned char *d, int len) |
0f113f3e | 16 | { |
f422a514 | 17 | return ASN1_STRING_set(x, d, len); |
0f113f3e | 18 | } |
08e9c1af | 19 | |
a338e21b | 20 | int i2c_ASN1_BIT_STRING(ASN1_BIT_STRING *a, unsigned char **pp) |
0f113f3e MC |
21 | { |
22 | int ret, j, bits, len; | |
23 | unsigned char *p, *d; | |
24 | ||
25 | if (a == NULL) | |
26 | return (0); | |
27 | ||
28 | len = a->length; | |
29 | ||
30 | if (len > 0) { | |
31 | if (a->flags & ASN1_STRING_FLAG_BITS_LEFT) { | |
32 | bits = (int)a->flags & 0x07; | |
33 | } else { | |
34 | for (; len > 0; len--) { | |
35 | if (a->data[len - 1]) | |
36 | break; | |
37 | } | |
38 | j = a->data[len - 1]; | |
39 | if (j & 0x01) | |
40 | bits = 0; | |
41 | else if (j & 0x02) | |
42 | bits = 1; | |
43 | else if (j & 0x04) | |
44 | bits = 2; | |
45 | else if (j & 0x08) | |
46 | bits = 3; | |
47 | else if (j & 0x10) | |
48 | bits = 4; | |
49 | else if (j & 0x20) | |
50 | bits = 5; | |
51 | else if (j & 0x40) | |
52 | bits = 6; | |
53 | else if (j & 0x80) | |
54 | bits = 7; | |
55 | else | |
56 | bits = 0; /* should not happen */ | |
57 | } | |
58 | } else | |
59 | bits = 0; | |
60 | ||
61 | ret = 1 + len; | |
62 | if (pp == NULL) | |
63 | return (ret); | |
64 | ||
65 | p = *pp; | |
66 | ||
67 | *(p++) = (unsigned char)bits; | |
68 | d = a->data; | |
69 | memcpy(p, d, len); | |
70 | p += len; | |
71 | if (len > 0) | |
72 | p[-1] &= (0xff << bits); | |
73 | *pp = p; | |
74 | return (ret); | |
75 | } | |
d02b48c6 | 76 | |
875a644a | 77 | ASN1_BIT_STRING *c2i_ASN1_BIT_STRING(ASN1_BIT_STRING **a, |
0f113f3e MC |
78 | const unsigned char **pp, long len) |
79 | { | |
80 | ASN1_BIT_STRING *ret = NULL; | |
81 | const unsigned char *p; | |
82 | unsigned char *s; | |
83 | int i; | |
84 | ||
85 | if (len < 1) { | |
86 | i = ASN1_R_STRING_TOO_SHORT; | |
87 | goto err; | |
88 | } | |
89 | ||
90 | if ((a == NULL) || ((*a) == NULL)) { | |
f422a514 | 91 | if ((ret = ASN1_BIT_STRING_new()) == NULL) |
0f113f3e MC |
92 | return (NULL); |
93 | } else | |
94 | ret = (*a); | |
95 | ||
96 | p = *pp; | |
97 | i = *(p++); | |
98 | if (i > 7) { | |
99 | i = ASN1_R_INVALID_BIT_STRING_BITS_LEFT; | |
100 | goto err; | |
101 | } | |
102 | /* | |
103 | * We do this to preserve the settings. If we modify the settings, via | |
104 | * the _set_bit function, we will recalculate on output | |
105 | */ | |
106 | ret->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear */ | |
107 | ret->flags |= (ASN1_STRING_FLAG_BITS_LEFT | i); /* set */ | |
108 | ||
109 | if (len-- > 1) { /* using one because of the bits left byte */ | |
b196e7d9 | 110 | s = OPENSSL_malloc((int)len); |
0f113f3e MC |
111 | if (s == NULL) { |
112 | i = ERR_R_MALLOC_FAILURE; | |
113 | goto err; | |
114 | } | |
115 | memcpy(s, p, (int)len); | |
116 | s[len - 1] &= (0xff << i); | |
117 | p += len; | |
118 | } else | |
119 | s = NULL; | |
120 | ||
121 | ret->length = (int)len; | |
b548a1f1 | 122 | OPENSSL_free(ret->data); |
0f113f3e MC |
123 | ret->data = s; |
124 | ret->type = V_ASN1_BIT_STRING; | |
125 | if (a != NULL) | |
126 | (*a) = ret; | |
127 | *pp = p; | |
128 | return (ret); | |
129 | err: | |
130 | ASN1err(ASN1_F_C2I_ASN1_BIT_STRING, i); | |
0dfb9398 | 131 | if ((a == NULL) || (*a != ret)) |
f422a514 | 132 | ASN1_BIT_STRING_free(ret); |
0f113f3e MC |
133 | return (NULL); |
134 | } | |
135 | ||
136 | /* | |
137 | * These next 2 functions from Goetz Babin-Ebell <babinebell@trustcenter.de> | |
58964a49 | 138 | */ |
6343829a | 139 | int ASN1_BIT_STRING_set_bit(ASN1_BIT_STRING *a, int n, int value) |
0f113f3e MC |
140 | { |
141 | int w, v, iv; | |
142 | unsigned char *c; | |
143 | ||
144 | w = n / 8; | |
145 | v = 1 << (7 - (n & 0x07)); | |
146 | iv = ~v; | |
147 | if (!value) | |
148 | v = 0; | |
149 | ||
150 | if (a == NULL) | |
151 | return 0; | |
152 | ||
153 | a->flags &= ~(ASN1_STRING_FLAG_BITS_LEFT | 0x07); /* clear, set on write */ | |
154 | ||
155 | if ((a->length < (w + 1)) || (a->data == NULL)) { | |
156 | if (!value) | |
157 | return (1); /* Don't need to set */ | |
c99de053 | 158 | c = OPENSSL_clear_realloc(a->data, a->length, w + 1); |
0f113f3e MC |
159 | if (c == NULL) { |
160 | ASN1err(ASN1_F_ASN1_BIT_STRING_SET_BIT, ERR_R_MALLOC_FAILURE); | |
161 | return 0; | |
162 | } | |
163 | if (w + 1 - a->length > 0) | |
164 | memset(c + a->length, 0, w + 1 - a->length); | |
165 | a->data = c; | |
166 | a->length = w + 1; | |
167 | } | |
168 | a->data[w] = ((a->data[w]) & iv) | v; | |
169 | while ((a->length > 0) && (a->data[a->length - 1] == 0)) | |
170 | a->length--; | |
171 | return (1); | |
172 | } | |
58964a49 | 173 | |
f756fb43 | 174 | int ASN1_BIT_STRING_get_bit(const ASN1_BIT_STRING *a, int n) |
0f113f3e MC |
175 | { |
176 | int w, v; | |
58964a49 | 177 | |
0f113f3e MC |
178 | w = n / 8; |
179 | v = 1 << (7 - (n & 0x07)); | |
180 | if ((a == NULL) || (a->length < (w + 1)) || (a->data == NULL)) | |
181 | return (0); | |
182 | return ((a->data[w] & v) != 0); | |
183 | } | |
58964a49 | 184 | |
c7235be6 | 185 | /* |
0f113f3e | 186 | * Checks if the given bit string contains only bits specified by |
c7235be6 UM |
187 | * the flags vector. Returns 0 if there is at least one bit set in 'a' |
188 | * which is not specified in 'flags', 1 otherwise. | |
189 | * 'len' is the length of 'flags'. | |
190 | */ | |
f756fb43 | 191 | int ASN1_BIT_STRING_check(const ASN1_BIT_STRING *a, |
0f113f3e MC |
192 | const unsigned char *flags, int flags_len) |
193 | { | |
194 | int i, ok; | |
195 | /* Check if there is one bit set at all. */ | |
196 | if (!a || !a->data) | |
197 | return 1; | |
198 | ||
199 | /* | |
200 | * Check each byte of the internal representation of the bit string. | |
201 | */ | |
202 | ok = 1; | |
203 | for (i = 0; i < a->length && ok; ++i) { | |
204 | unsigned char mask = i < flags_len ? ~flags[i] : 0xff; | |
205 | /* We are done if there is an unneeded bit set. */ | |
206 | ok = (a->data[i] & mask) == 0; | |
207 | } | |
208 | return ok; | |
209 | } |