1/* $OpenBSD: dh_asn1.c,v 1.13 2024/04/15 15:47:37 tb Exp $ */
2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 * project 2000.
4 */
5/* ====================================================================
6 * Copyright (c) 2000-2005 The OpenSSL Project.  All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 *
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 *
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in
17 *    the documentation and/or other materials provided with the
18 *    distribution.
19 *
20 * 3. All advertising materials mentioning features or use of this
21 *    software must display the following acknowledgment:
22 *    "This product includes software developed by the OpenSSL Project
23 *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 *
25 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
26 *    endorse or promote products derived from this software without
27 *    prior written permission. For written permission, please contact
28 *    licensing@OpenSSL.org.
29 *
30 * 5. Products derived from this software may not be called "OpenSSL"
31 *    nor may "OpenSSL" appear in their names without prior written
32 *    permission of the OpenSSL Project.
33 *
34 * 6. Redistributions of any form whatsoever must retain the following
35 *    acknowledgment:
36 *    "This product includes software developed by the OpenSSL Project
37 *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 *
39 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
40 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
41 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
42 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
43 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
45 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
46 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
48 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
49 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
50 * OF THE POSSIBILITY OF SUCH DAMAGE.
51 * ====================================================================
52 *
53 * This product includes cryptographic software written by Eric Young
54 * (eay@cryptsoft.com).  This product includes software written by Tim
55 * Hudson (tjh@cryptsoft.com).
56 *
57 */
58
59#include <stdio.h>
60
61#include <openssl/asn1t.h>
62#include <openssl/bn.h>
63#include <openssl/dh.h>
64#include <openssl/objects.h>
65
66#include "dh_local.h"
67
68/* Override the default free and new methods */
69static int
70dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, void *exarg)
71{
72	if (operation == ASN1_OP_NEW_PRE) {
73		*pval = (ASN1_VALUE *)DH_new();
74		if (*pval)
75			return 2;
76		return 0;
77	} else if (operation == ASN1_OP_FREE_PRE) {
78		DH_free((DH *)*pval);
79		*pval = NULL;
80		return 2;
81	}
82	return 1;
83}
84
85static const ASN1_AUX DHparams_aux = {
86	.app_data = NULL,
87	.flags = 0,
88	.ref_offset = 0,
89	.ref_lock = 0,
90	.asn1_cb = dh_cb,
91	.enc_offset = 0,
92};
93static const ASN1_TEMPLATE DHparams_seq_tt[] = {
94	{
95		.flags = 0,
96		.tag = 0,
97		.offset = offsetof(DH, p),
98		.field_name = "p",
99		.item = &BIGNUM_it,
100	},
101	{
102		.flags = 0,
103		.tag = 0,
104		.offset = offsetof(DH, g),
105		.field_name = "g",
106		.item = &BIGNUM_it,
107	},
108	{
109		.flags = ASN1_TFLG_OPTIONAL,
110		.tag = 0,
111		.offset = offsetof(DH, length),
112		.field_name = "length",
113		.item = &ZLONG_it,
114	},
115};
116
117static const ASN1_ITEM DHparams_it = {
118	.itype = ASN1_ITYPE_SEQUENCE,
119	.utype = V_ASN1_SEQUENCE,
120	.templates = DHparams_seq_tt,
121	.tcount = sizeof(DHparams_seq_tt) / sizeof(ASN1_TEMPLATE),
122	.funcs = &DHparams_aux,
123	.size = sizeof(DH),
124	.sname = "DH",
125};
126
127
128DH *
129d2i_DHparams(DH **a, const unsigned char **in, long len)
130{
131	return (DH *)ASN1_item_d2i((ASN1_VALUE **)a, in, len,
132	    &DHparams_it);
133}
134LCRYPTO_ALIAS(d2i_DHparams);
135
136int
137i2d_DHparams(const DH *a, unsigned char **out)
138{
139	return ASN1_item_i2d((ASN1_VALUE *)a, out, &DHparams_it);
140}
141LCRYPTO_ALIAS(i2d_DHparams);
142
143DH *
144d2i_DHparams_bio(BIO *bp, DH **a)
145{
146	return ASN1_item_d2i_bio(&DHparams_it, bp, a);
147}
148LCRYPTO_ALIAS(d2i_DHparams_bio);
149
150int
151i2d_DHparams_bio(BIO *bp, DH *a)
152{
153	return ASN1_item_i2d_bio(&DHparams_it, bp, a);
154}
155LCRYPTO_ALIAS(i2d_DHparams_bio);
156
157DH *
158d2i_DHparams_fp(FILE *fp, DH **a)
159{
160	return ASN1_item_d2i_fp(&DHparams_it, fp, a);
161}
162LCRYPTO_ALIAS(d2i_DHparams_fp);
163
164int
165i2d_DHparams_fp(FILE *fp, DH *a)
166{
167	return ASN1_item_i2d_fp(&DHparams_it, fp, a);
168}
169LCRYPTO_ALIAS(i2d_DHparams_fp);
170
171DH *
172DHparams_dup(DH *dh)
173{
174	return ASN1_item_dup(&DHparams_it, dh);
175}
176LCRYPTO_ALIAS(DHparams_dup);
177