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