1/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
2 * All rights reserved.
3 *
4 * This package is an SSL implementation written
5 * by Eric Young (eay@cryptsoft.com).
6 * The implementation was written so as to conform with Netscapes SSL.
7 *
8 * This library is free for commercial and non-commercial use as long as
9 * the following conditions are aheared to.  The following conditions
10 * apply to all code found in this distribution, be it the RC4, RSA,
11 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
12 * included with this distribution is covered by the same copyright terms
13 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
14 *
15 * Copyright remains Eric Young's, and as such any Copyright notices in
16 * the code are not to be removed.
17 * If this package is used in a product, Eric Young should be given attribution
18 * as the author of the parts of the library used.
19 * This can be in the form of a textual message at program startup or
20 * in documentation (online or textual) provided with the package.
21 *
22 * Redistribution and use in source and binary forms, with or without
23 * modification, are permitted provided that the following conditions
24 * are met:
25 * 1. Redistributions of source code must retain the copyright
26 *    notice, this list of conditions and the following disclaimer.
27 * 2. Redistributions in binary form must reproduce the above copyright
28 *    notice, this list of conditions and the following disclaimer in the
29 *    documentation and/or other materials provided with the distribution.
30 * 3. All advertising materials mentioning features or use of this software
31 *    must display the following acknowledgement:
32 *    "This product includes cryptographic software written by
33 *     Eric Young (eay@cryptsoft.com)"
34 *    The word 'cryptographic' can be left out if the rouines from the library
35 *    being used are not cryptographic related :-).
36 * 4. If you include any Windows specific code (or a derivative thereof) from
37 *    the apps directory (application code) you must include an acknowledgement:
38 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
39 *
40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
43 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * The licence and distribution terms for any publically available version or
53 * derivative of this code cannot be changed.  i.e. this code cannot simply be
54 * copied and put under another distribution licence
55 * [including the GNU Public Licence.] */
56
57#include <openssl/asn1.h>
58
59#include <string.h>
60
61#include <openssl/err.h>
62#include <openssl/mem.h>
63
64
65/*
66 * Code for ENUMERATED type: identical to INTEGER apart from a different tag.
67 * for comments on encoding see a_int.c
68 */
69
70int ASN1_ENUMERATED_set(ASN1_ENUMERATED *a, long v)
71	{
72	int j,k;
73	unsigned int i;
74	unsigned char buf[sizeof(long)+1];
75	long d;
76
77	a->type=V_ASN1_ENUMERATED;
78	if (a->length < (int)(sizeof(long)+1))
79		{
80		if (a->data != NULL)
81			OPENSSL_free(a->data);
82		if ((a->data=(unsigned char *)OPENSSL_malloc(sizeof(long)+1)) != NULL)
83			memset((char *)a->data,0,sizeof(long)+1);
84		}
85	if (a->data == NULL)
86		{
87		OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
88		return(0);
89		}
90	d=v;
91	if (d < 0)
92		{
93		d= -d;
94		a->type=V_ASN1_NEG_ENUMERATED;
95		}
96
97	for (i=0; i<sizeof(long); i++)
98		{
99		if (d == 0) break;
100		buf[i]=(int)d&0xff;
101		d>>=8;
102		}
103	j=0;
104	for (k=i-1; k >=0; k--)
105		a->data[j++]=buf[k];
106	a->length=j;
107	return(1);
108	}
109
110long ASN1_ENUMERATED_get(ASN1_ENUMERATED *a)
111	{
112	int neg=0,i;
113	long r=0;
114
115	if (a == NULL) return(0L);
116	i=a->type;
117	if (i == V_ASN1_NEG_ENUMERATED)
118		neg=1;
119	else if (i != V_ASN1_ENUMERATED)
120		return -1;
121
122	if (a->length > (int)sizeof(long))
123		{
124		/* hmm... a bit ugly */
125		return(0xffffffffL);
126		}
127	if (a->data == NULL)
128		return 0;
129
130	for (i=0; i<a->length; i++)
131		{
132		r<<=8;
133		r|=(unsigned char)a->data[i];
134		}
135	if (neg) r= -r;
136	return(r);
137	}
138
139ASN1_ENUMERATED *BN_to_ASN1_ENUMERATED(BIGNUM *bn, ASN1_ENUMERATED *ai)
140	{
141	ASN1_ENUMERATED *ret;
142	int len,j;
143
144	if (ai == NULL)
145		ret=M_ASN1_ENUMERATED_new();
146	else
147		ret=ai;
148	if (ret == NULL)
149		{
150		OPENSSL_PUT_ERROR(ASN1, ASN1_R_NESTED_ASN1_ERROR);
151		goto err;
152		}
153	if(BN_is_negative(bn)) ret->type = V_ASN1_NEG_ENUMERATED;
154	else ret->type=V_ASN1_ENUMERATED;
155	j=BN_num_bits(bn);
156	len=((j == 0)?0:((j/8)+1));
157	if (ret->length < len+4)
158		{
159		unsigned char *new_data=OPENSSL_realloc(ret->data, len+4);
160		if (!new_data)
161			{
162			OPENSSL_PUT_ERROR(ASN1, ERR_R_MALLOC_FAILURE);
163			goto err;
164			}
165		ret->data=new_data;
166		}
167
168	ret->length=BN_bn2bin(bn,ret->data);
169	return(ret);
170err:
171	if (ret != ai) M_ASN1_ENUMERATED_free(ret);
172	return(NULL);
173	}
174
175BIGNUM *ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED *ai, BIGNUM *bn)
176	{
177	BIGNUM *ret;
178
179	if ((ret=BN_bin2bn(ai->data,ai->length,bn)) == NULL)
180		OPENSSL_PUT_ERROR(ASN1, ASN1_R_BN_LIB);
181	else if(ai->type == V_ASN1_NEG_ENUMERATED) BN_set_negative(ret,1);
182	return(ret);
183	}
184