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 
ASN1_ENUMERATED_set(ASN1_ENUMERATED * a,long v)70 int 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 
ASN1_ENUMERATED_get(ASN1_ENUMERATED * a)110 long 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 
BN_to_ASN1_ENUMERATED(BIGNUM * bn,ASN1_ENUMERATED * ai)139 ASN1_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);
170 err:
171 	if (ret != ai) M_ASN1_ENUMERATED_free(ret);
172 	return(NULL);
173 	}
174 
ASN1_ENUMERATED_to_BN(ASN1_ENUMERATED * ai,BIGNUM * bn)175 BIGNUM *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