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
69int 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
109long 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
138ASN1_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);
169err:
170	if (ret != ai) M_ASN1_ENUMERATED_free(ret);
171	return(NULL);
172	}
173
174BIGNUM *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	}
183