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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
63/*
64 * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
65 * for comments on encoding see a_int.c
66 */
67
68int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
69 {
70 int i,j,k;
71 unsigned char buf[sizeof(long)+1];
72 long d;
73
74 a->type=V_ASN1_ENUMERATED;
75 if (a->length < (sizeof(long)+1))
76 {
77 if (a->data != NULL)
78 OPENSSL_free(a->data);
79 if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)
80 memset((char *)a->data,0,sizeof(long)+1);
81 }
82 if (a->data == NULL)
83 {
84 ASN1err(ASN1_F_ASN1_ENUMERATED_SET,ERR_R_MALLOC_FAILURE);
85 return(0);
86 }
87 d=v;
88 if (d < 0)
89 {
90 d= -d;
91 a->type=V_ASN1_NEG_ENUMERATED;
92 }
93
94 for (i=0; i<sizeof(long); i++)
95 {
96 if (d == 0) 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
107long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
108 {
109 int neg=0,i;
110 long r=0;
111
112 if (a == NULL) return(0L);
113 i=a->type;
114 if (i == V_ASN1_NEG_ENUMERATED)
115 neg=1;
116 else if (i != V_ASN1_ENUMERATED)
117 return -1;
118
119 if (a->length > sizeof(long))
120 {
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 {
129 r<<=8;
130 r|=(unsigned char)a->data[i];
131 }
132 if (neg) r= -r;
133 return(r);
134 }
135
136ASN1_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 {
147 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_NESTED_ASN1_ERROR);
148 goto err;
149 }
150 if(bn->neg) ret->type = V_ASN1_NEG_ENUMERATED;
151 else ret->type=V_ASN1_ENUMERATED;
152 j=BN_num_bits(bn);
153 len=((j == 0)?0:((j/8)+1));
154 if (ret->length < len+4)
155 {
156 unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
157 if (!new_data)
158 {
159 ASN1err(ASN1_F_BN_TO_ASN1_ENUMERATED,ERR_R_MALLOC_FAILURE);
160 goto err;
161 }
162 ret->data=new_data;
163 }
164
165 ret->length=BN_bn2bin(bn,ret->data);
166 return(ret);
167err:
168 if (ret != ai) M_ASN1_ENUMERATED_free(ret);
169 return(NULL);
170 }
171
172BIGNUM *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) ret->neg = 1;
179 return(ret);
180 }
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