1 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to. The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 * notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 * notice, this list of conditions and the following disclaimer in the
29 * documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 * must display the following acknowledgement:
32 * "This product includes cryptographic software written by
33 * Eric Young (eay@cryptsoft.com)"
34 * The word 'cryptographic' can be left out if the rouines from the library
35 * being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 * the apps directory (application code) you must include an acknowledgement:
38 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed. i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57 #include <openssl/asn1.h>
58
59 #include <limits.h>
60 #include <string.h>
61
62 #include <openssl/err.h>
63 #include <openssl/mem.h>
64
65 #include "../internal.h"
66
67
68 /*
69 * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
70 * for comments on encoding see a_int.c
71 */
72
ASN1_ENUMERATED_set(ASN1_ENUMERATED * a,long v)73 int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
74 {
75 int j, k;
76 unsigned int i;
77 unsigned char buf[sizeof(long) + 1];
78 long d;
79
80 a->type = V_ASN1_ENUMERATED;
81 if (a->length < (int)(sizeof(long) + 1)) {
82 if (a->data != NULL)
83 OPENSSL_free(a->data);
84 if ((a->data =
85 (unsigned char *)OPENSSL_malloc(sizeof(long) + 1)) != NULL)
86 OPENSSL_memset((char *)a->data, 0, sizeof(long) + 1);
87 }
88 if (a->data == NULL) {
89 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
90 return (0);
91 }
92 d = v;
93 if (d < 0) {
94 d = -d;
95 a->type = V_ASN1_NEG_ENUMERATED;
96 }
97
98 for (i = 0; i < sizeof(long); i++) {
99 if (d == 0)
100 break;
101 buf[i] = (int)d & 0xff;
102 d >>= 8;
103 }
104 j = 0;
105 for (k = i - 1; k >= 0; k--)
106 a->data[j++] = buf[k];
107 a->length = j;
108 return (1);
109 }
110
ASN1_ENUMERATED_get(ASN1_ENUMERATED * a)111 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
112 {
113 int neg = 0, i;
114
115 if (a == NULL)
116 return (0L);
117 i = a->type;
118 if (i == V_ASN1_NEG_ENUMERATED)
119 neg = 1;
120 else if (i != V_ASN1_ENUMERATED)
121 return -1;
122
123 OPENSSL_COMPILE_ASSERT(sizeof(uint64_t) >= sizeof(long),
124 long_larger_than_uint64_t);
125
126 if (a->length > (int)sizeof(uint64_t)) {
127 /* hmm... a bit ugly */
128 return -1;
129 }
130
131 uint64_t r64 = 0;
132 if (a->data != NULL) {
133 for (i = 0; i < a->length; i++) {
134 r64 <<= 8;
135 r64 |= (unsigned char)a->data[i];
136 }
137
138 if (r64 > LONG_MAX) {
139 return -1;
140 }
141 }
142
143 long r = (long) r64;
144 if (neg)
145 r = -r;
146
147 return r;
148 }
149
BN_to_ASN1_ENUMERATED(BIGNUM * bn,ASN1_ENUMERATED * ai)150 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
151 {
152 ASN1_ENUMERATED *ret;
153 int len, j;
154
155 if (ai == NULL)
156 ret = M_ASN1_ENUMERATED_new();
157 else
158 ret = ai;
159 if (ret == NULL) {
160 OPENSSL_PUT_ERROR(ASN1, ASN1_R_NESTED_ASN1_ERROR);
161 goto err;
162 }
163 if (BN_is_negative(bn))
164 ret->type = V_ASN1_NEG_ENUMERATED;
165 else
166 ret->type = V_ASN1_ENUMERATED;
167 j = BN_num_bits(bn);
168 len = ((j == 0) ? 0 : ((j / 8) + 1));
169 if (ret->length < len + 4) {
170 unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4);
171 if (!new_data) {
172 OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
173 goto err;
174 }
175 ret->data = new_data;
176 }
177
178 ret->length = BN_bn2bin(bn, ret->data);
179 return (ret);
180 err:
181 if (ret != ai)
182 M_ASN1_ENUMERATED_free(ret);
183 return (NULL);
184 }
185
ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED * ai,BIGNUM * bn)186 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
187 {
188 BIGNUM *ret;
189
190 if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
191 OPENSSL_PUT_ERROR(ASN1, ASN1_R_BN_LIB);
192 else if (ai->type == V_ASN1_NEG_ENUMERATED)
193 BN_set_negative(ret, 1);
194 return (ret);
195 }
196