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1 : /* crypto/asn1/a_enum.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 : #include <openssl/bn.h>
63 :
64 : /*
65 : * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
66 : * for comments on encoding see a_int.c
67 : */
68 :
69 0 : int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
70 : {
71 : int j, k;
72 : unsigned int i;
73 : unsigned char buf[sizeof(long) + 1];
74 : long d;
75 :
76 0 : a->type = V_ASN1_ENUMERATED;
77 0 : if (a->length < (int)(sizeof(long) + 1)) {
78 0 : if (a->data != NULL)
79 0 : OPENSSL_free(a->data);
80 0 : if ((a->data =
81 0 : (unsigned char *)OPENSSL_malloc(sizeof(long) + 1)) != NULL)
82 : memset((char *)a->data, 0, sizeof(long) + 1);
83 : }
84 0 : if (a->data == NULL) {
85 0 : ASN1err(ASN1_F_ASN1_ENUMERATED_SET, ERR_R_MALLOC_FAILURE);
86 0 : return (0);
87 : }
88 : d = v;
89 0 : if (d < 0) {
90 0 : d = -d;
91 0 : a->type = V_ASN1_NEG_ENUMERATED;
92 : }
93 :
94 0 : for (i = 0; i < sizeof(long); i++) {
95 0 : if (d == 0)
96 : break;
97 0 : buf[i] = (int)d & 0xff;
98 0 : d >>= 8;
99 : }
100 : j = 0;
101 0 : for (k = i - 1; k >= 0; k--)
102 0 : a->data[j++] = buf[k];
103 0 : a->length = j;
104 0 : return (1);
105 : }
106 :
107 0 : long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
108 : {
109 : int neg = 0, i;
110 : long r = 0;
111 :
112 0 : if (a == NULL)
113 : return (0L);
114 0 : i = a->type;
115 0 : if (i == V_ASN1_NEG_ENUMERATED)
116 : neg = 1;
117 0 : else if (i != V_ASN1_ENUMERATED)
118 : return -1;
119 :
120 0 : if (a->length > (int)sizeof(long)) {
121 : /* hmm... a bit ugly */
122 : return (0xffffffffL);
123 : }
124 0 : if (a->data == NULL)
125 : return 0;
126 :
127 0 : for (i = 0; i < a->length; i++) {
128 0 : r <<= 8;
129 0 : r |= (unsigned char)a->data[i];
130 : }
131 0 : if (neg)
132 0 : r = -r;
133 0 : return (r);
134 : }
135 :
136 0 : ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
137 : {
138 : ASN1_ENUMERATED *ret;
139 : int len, j;
140 :
141 0 : if (ai == NULL)
142 0 : ret = M_ASN1_ENUMERATED_new();
143 : else
144 : ret = ai;
145 0 : if (ret == NULL) {
146 0 : ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_NESTED_ASN1_ERROR);
147 0 : goto err;
148 : }
149 0 : if (BN_is_negative(bn))
150 0 : ret->type = V_ASN1_NEG_ENUMERATED;
151 : else
152 0 : ret->type = V_ASN1_ENUMERATED;
153 0 : j = BN_num_bits(bn);
154 0 : len = ((j == 0) ? 0 : ((j / 8) + 1));
155 0 : if (ret->length < len + 4) {
156 0 : unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4);
157 0 : if (!new_data) {
158 0 : ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
159 0 : goto err;
160 : }
161 0 : ret->data = new_data;
162 : }
163 :
164 0 : ret->length = BN_bn2bin(bn, ret->data);
165 0 : return (ret);
166 : err:
167 0 : if (ret != ai)
168 0 : M_ASN1_ENUMERATED_free(ret);
169 : return (NULL);
170 : }
171 :
172 0 : BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
173 : {
174 : BIGNUM *ret;
175 :
176 0 : if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
177 0 : ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN, ASN1_R_BN_LIB);
178 0 : else if (ai->type == V_ASN1_NEG_ENUMERATED)
179 0 : BN_set_negative(ret, 1);
180 0 : return (ret);
181 : }
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