2 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
5 /* ====================================================================
6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
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
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/)"
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.
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.
34 * 6. Redistributions of any form whatsoever must retain the following
36 * "This product includes software developed by the OpenSSL Project
37 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
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 * ====================================================================
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).
60 #include "internal/cryptlib.h"
61 #include <openssl/bn.h>
62 #include <openssl/dh.h>
63 #include <openssl/objects.h>
64 #include <openssl/asn1t.h>
66 /* Override the default free and new methods */
67 static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
70 if (operation == ASN1_OP_NEW_PRE) {
71 *pval = (ASN1_VALUE *)DH_new();
75 } else if (operation == ASN1_OP_FREE_PRE) {
83 ASN1_SEQUENCE_cb(DHparams, dh_cb) = {
84 ASN1_SIMPLE(DH, p, BIGNUM),
85 ASN1_SIMPLE(DH, g, BIGNUM),
86 ASN1_OPT(DH, length, ZLONG),
87 } ASN1_SEQUENCE_END_cb(DH, DHparams)
89 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)
92 * Internal only structures for handling X9.42 DH: this gets translated to or
93 * from a DH structure straight away.
97 ASN1_BIT_STRING *seed;
106 int_dhvparams *vparams;
109 ASN1_SEQUENCE(DHvparams) = {
110 ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING),
111 ASN1_SIMPLE(int_dhvparams, counter, BIGNUM)
112 } static_ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams)
114 ASN1_SEQUENCE(DHxparams) = {
115 ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM),
116 ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM),
117 ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM),
118 ASN1_OPT(int_dhx942_dh, j, BIGNUM),
119 ASN1_OPT(int_dhx942_dh, vparams, DHvparams),
120 } static_ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams)
122 int_dhx942_dh *d2i_int_dhx(int_dhx942_dh **a,
123 const unsigned char **pp, long length);
124 int i2d_int_dhx(const int_dhx942_dh *a, unsigned char **pp);
126 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx)
128 /* Application public function: read in X9.42 DH parameters into DH structure */
130 DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length)
132 int_dhx942_dh *dhx = NULL;
137 dhx = d2i_int_dhx(NULL, pp, length);
154 dh->seed = dhx->vparams->seed->data;
155 dh->seedlen = dhx->vparams->seed->length;
156 dh->counter = dhx->vparams->counter;
157 dhx->vparams->seed->data = NULL;
158 ASN1_BIT_STRING_free(dhx->vparams->seed);
159 OPENSSL_free(dhx->vparams);
167 int i2d_DHxparams(const DH *dh, unsigned char **pp)
176 if (dh->counter && dh->seed && dh->seedlen > 0) {
177 bs.flags = ASN1_STRING_FLAG_BITS_LEFT;
179 bs.length = dh->seedlen;
181 dhv.counter = dh->counter;
186 return i2d_int_dhx(&dhx, pp);