a_enum.c revision 109998 
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_INTEGER,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	}
181