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 
ASN1_ENUMERATED_set(ASN1_ENUMERATED * a,long v)69 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     a->type = V_ASN1_ENUMERATED;
77     if (a->length < (int)(sizeof(long) + 1)) {
78         if (a->data != NULL)
79             OPENSSL_free(a->data);
80         if ((a->data =
81              (unsigned char *)OPENSSL_malloc(sizeof(long) + 1)) != NULL)
82             memset((char *)a->data, 0, sizeof(long) + 1);
83     }
84     if (a->data == NULL) {
85         ASN1err(ASN1_F_ASN1_ENUMERATED_SET, ERR_R_MALLOC_FAILURE);
86         return (0);
87     }
88     d = v;
89     if (d < 0) {
90         d = -d;
91         a->type = V_ASN1_NEG_ENUMERATED;
92     }
93 
94     for (i = 0; i < sizeof(long); i++) {
95         if (d == 0)
96             break;
97         buf[i] = (int)d & 0xff;
98         d >>= 8;
99     }
100     j = 0;
101     for (k = i - 1; k >= 0; k--)
102         a->data[j++] = buf[k];
103     a->length = j;
104     return (1);
105 }
106 
ASN1_ENUMERATED_get(ASN1_ENUMERATED * a)107 long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
108 {
109     int neg = 0, i;
110     long r = 0;
111 
112     if (a == NULL)
113         return (0L);
114     i = a->type;
115     if (i == V_ASN1_NEG_ENUMERATED)
116         neg = 1;
117     else if (i != V_ASN1_ENUMERATED)
118         return -1;
119 
120     if (a->length > (int)sizeof(long)) {
121         /* hmm... a bit ugly */
122         return (0xffffffffL);
123     }
124     if (a->data == NULL)
125         return 0;
126 
127     for (i = 0; i < a->length; i++) {
128         r <<= 8;
129         r |= (unsigned char)a->data[i];
130     }
131     if (neg)
132         r = -r;
133     return (r);
134 }
135 
BN_to_ASN1_ENUMERATED(BIGNUM * bn,ASN1_ENUMERATED * ai)136 ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
137 {
138     ASN1_ENUMERATED *ret;
139     int len, j;
140 
141     if (ai == NULL)
142         ret = M_ASN1_ENUMERATED_new();
143     else
144         ret = ai;
145     if (ret == NULL) {
146         ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_NESTED_ASN1_ERROR);
147         goto err;
148     }
149     if (BN_is_negative(bn))
150         ret->type = V_ASN1_NEG_ENUMERATED;
151     else
152         ret->type = V_ASN1_ENUMERATED;
153     j = BN_num_bits(bn);
154     len = ((j == 0) ? 0 : ((j / 8) + 1));
155     if (ret->length < len + 4) {
156         unsigned char *new_data = OPENSSL_realloc(ret->data, len + 4);
157         if (!new_data) {
158             ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED, ERR_R_MALLOC_FAILURE);
159             goto err;
160         }
161         ret->data = new_data;
162     }
163 
164     ret->length = BN_bn2bin(bn, ret->data);
165     return (ret);
166  err:
167     if (ret != ai)
168         M_ASN1_ENUMERATED_free(ret);
169     return (NULL);
170 }
171 
ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED * ai,BIGNUM * bn)172 BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
173 {
174     BIGNUM *ret;
175 
176     if ((ret = BN_bin2bn(ai->data, ai->length, bn)) == NULL)
177         ASN1err(ASN1_F_ASN1_ENUMERATED_TO_BN, ASN1_R_BN_LIB);
178     else if (ai->type == V_ASN1_NEG_ENUMERATED)
179         BN_set_negative(ret, 1);
180     return (ret);
181 }
182