1 /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
4 /* ====================================================================
5 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in
16 * the documentation and/or other materials provided with the
19 * 3. All advertising materials mentioning features or use of this
20 * software must display the following acknowledgment:
21 * "This product includes software developed by the OpenSSL Project
22 * for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
24 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
25 * endorse or promote products derived from this software without
26 * prior written permission. For written permission, please contact
27 * licensing@OpenSSL.org.
29 * 5. Products derived from this software may not be called "OpenSSL"
30 * nor may "OpenSSL" appear in their names without prior written
31 * permission of the OpenSSL Project.
33 * 6. Redistributions of any form whatsoever must retain the following
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
39 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
40 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
41 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
42 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
43 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
44 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
45 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
46 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
47 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
48 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
49 * OF THE POSSIBILITY OF SUCH DAMAGE.
50 * ====================================================================
52 * This product includes cryptographic software written by Eric Young
53 * (eay@cryptsoft.com). This product includes software written by Tim
54 * Hudson (tjh@cryptsoft.com). */
56 #include <openssl/dh.h>
61 #include <openssl/bn.h>
62 #include <openssl/bytestring.h>
63 #include <openssl/err.h>
65 #include "../bytestring/internal.h"
68 static int parse_integer(CBS *cbs, BIGNUM **out) {
74 return BN_parse_asn1_unsigned(cbs, *out);
77 static int marshal_integer(CBB *cbb, BIGNUM *bn) {
79 // A DH object may be missing some components.
80 OPENSSL_PUT_ERROR(DH, ERR_R_PASSED_NULL_PARAMETER);
83 return BN_marshal_asn1(cbb, bn);
86 DH *DH_parse_parameters(CBS *cbs) {
93 if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
94 !parse_integer(&child, &ret->p) ||
95 !parse_integer(&child, &ret->g)) {
100 if (CBS_len(&child) != 0) {
101 if (!CBS_get_asn1_uint64(&child, &priv_length) ||
102 priv_length > UINT_MAX) {
105 ret->priv_length = (unsigned)priv_length;
108 if (CBS_len(&child) != 0) {
115 OPENSSL_PUT_ERROR(DH, DH_R_DECODE_ERROR);
120 int DH_marshal_parameters(CBB *cbb, const DH *dh) {
122 if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
123 !marshal_integer(&child, dh->p) ||
124 !marshal_integer(&child, dh->g) ||
125 (dh->priv_length != 0 &&
126 !CBB_add_asn1_uint64(&child, dh->priv_length)) ||
128 OPENSSL_PUT_ERROR(DH, DH_R_ENCODE_ERROR);
134 DH *d2i_DHparams(DH **out, const uint8_t **inp, long len) {
139 CBS_init(&cbs, *inp, (size_t)len);
140 DH *ret = DH_parse_parameters(&cbs);
148 *inp = CBS_data(&cbs);
152 int i2d_DHparams(const DH *in, uint8_t **outp) {
154 if (!CBB_init(&cbb, 0) ||
155 !DH_marshal_parameters(&cbb, in)) {
159 return CBB_finish_i2d(&cbb, outp);