3 * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
6 /* ====================================================================
7 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
21 * 3. All advertising materials mentioning features or use of this
22 * software must display the following acknowledgment:
23 * "This product includes software developed by the OpenSSL Project
24 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
26 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
27 * endorse or promote products derived from this software without
28 * prior written permission. For written permission, please contact
29 * licensing@OpenSSL.org.
31 * 5. Products derived from this software may not be called "OpenSSL"
32 * nor may "OpenSSL" appear in their names without prior written
33 * permission of the OpenSSL Project.
35 * 6. Redistributions of any form whatsoever must retain the following
37 * "This product includes software developed by the OpenSSL Project
38 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
40 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
41 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
43 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
44 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
45 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
46 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
47 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
49 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
50 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
51 * OF THE POSSIBILITY OF SUCH DAMAGE.
52 * ====================================================================
54 * This product includes cryptographic software written by Eric Young
55 * (eay@cryptsoft.com). This product includes software written by Tim
56 * Hudson (tjh@cryptsoft.com).
61 #include "internal/cryptlib.h"
62 #include <openssl/bn.h>
63 #include <openssl/dh.h>
64 #include <openssl/objects.h>
65 #include <openssl/asn1t.h>
67 /* Override the default free and new methods */
68 static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
71 if (operation == ASN1_OP_NEW_PRE) {
72 *pval = (ASN1_VALUE *)DH_new();
76 } else if (operation == ASN1_OP_FREE_PRE) {
84 ASN1_SEQUENCE_cb(DHparams, dh_cb) = {
85 ASN1_SIMPLE(DH, p, BIGNUM),
86 ASN1_SIMPLE(DH, g, BIGNUM),
87 ASN1_OPT(DH, length, ZLONG),
88 } static_ASN1_SEQUENCE_END_cb(DH, DHparams)
90 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)
93 * Internal only structures for handling X9.42 DH: this gets translated to or
94 * from a DH structure straight away.
98 ASN1_BIT_STRING *seed;
107 int_dhvparams *vparams;
110 ASN1_SEQUENCE(DHvparams) = {
111 ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING),
112 ASN1_SIMPLE(int_dhvparams, counter, BIGNUM)
113 } static_ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams)
115 ASN1_SEQUENCE(DHxparams) = {
116 ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM),
117 ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM),
118 ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM),
119 ASN1_OPT(int_dhx942_dh, j, BIGNUM),
120 ASN1_OPT(int_dhx942_dh, vparams, DHvparams),
121 } static_ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams)
123 int_dhx942_dh *d2i_int_dhx(int_dhx942_dh **a,
124 const unsigned char **pp, long length);
125 int i2d_int_dhx(const int_dhx942_dh *a, unsigned char **pp);
127 IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx)
129 /* Application leve function: read in X9.42 DH parameters into DH structure */
131 DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length)
133 int_dhx942_dh *dhx = NULL;
138 dhx = d2i_int_dhx(NULL, pp, length);
155 dh->seed = dhx->vparams->seed->data;
156 dh->seedlen = dhx->vparams->seed->length;
157 dh->counter = dhx->vparams->counter;
158 dhx->vparams->seed->data = NULL;
159 ASN1_BIT_STRING_free(dhx->vparams->seed);
160 OPENSSL_free(dhx->vparams);
168 int i2d_DHxparams(const DH *dh, unsigned char **pp)
177 if (dh->counter && dh->seed && dh->seedlen > 0) {
178 bs.flags = ASN1_STRING_FLAG_BITS_LEFT;
180 bs.length = dh->seedlen;
182 dhv.counter = dh->counter;
187 return i2d_int_dhx(&dhx, pp);