1 /* Written by Dr Stephen N Henson ([email protected]) for the OpenSSL
2 * project 2000.
3 */
4 /* ====================================================================
5 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 *
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
17 * distribution.
18 *
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/)"
23 *
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 * [email protected].
28 *
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.
32 *
33 * 6. Redistributions of any form whatsoever must retain the following
34 * acknowledgment:
35 * "This product includes software developed by the OpenSSL Project
36 * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
37 *
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 * ====================================================================
51 *
52 * This product includes cryptographic software written by Eric Young
53 * ([email protected]). This product includes software written by Tim
54 * Hudson ([email protected]). */
55
56 #include <openssl/dh.h>
57
58 #include <assert.h>
59 #include <limits.h>
60
61 #include <openssl/bn.h>
62 #include <openssl/bytestring.h>
63 #include <openssl/err.h>
64
65 #include "../bytestring/internal.h"
66 #include "../fipsmodule/dh/internal.h"
67
68
parse_integer(CBS * cbs,BIGNUM ** out)69 static int parse_integer(CBS *cbs, BIGNUM **out) {
70 assert(*out == NULL);
71 *out = BN_new();
72 if (*out == NULL) {
73 return 0;
74 }
75 return BN_parse_asn1_unsigned(cbs, *out);
76 }
77
marshal_integer(CBB * cbb,BIGNUM * bn)78 static int marshal_integer(CBB *cbb, BIGNUM *bn) {
79 if (bn == NULL) {
80 // A DH object may be missing some components.
81 OPENSSL_PUT_ERROR(DH, ERR_R_PASSED_NULL_PARAMETER);
82 return 0;
83 }
84 return BN_marshal_asn1(cbb, bn);
85 }
86
DH_parse_parameters(CBS * cbs)87 DH *DH_parse_parameters(CBS *cbs) {
88 DH *ret = DH_new();
89 if (ret == NULL) {
90 return NULL;
91 }
92
93 CBS child;
94 if (!CBS_get_asn1(cbs, &child, CBS_ASN1_SEQUENCE) ||
95 !parse_integer(&child, &ret->p) ||
96 !parse_integer(&child, &ret->g)) {
97 goto err;
98 }
99
100 uint64_t priv_length;
101 if (CBS_len(&child) != 0) {
102 if (!CBS_get_asn1_uint64(&child, &priv_length) ||
103 priv_length > UINT_MAX) {
104 goto err;
105 }
106 ret->priv_length = (unsigned)priv_length;
107 }
108
109 if (CBS_len(&child) != 0) {
110 goto err;
111 }
112
113 if (!dh_check_params_fast(ret)) {
114 goto err;
115 }
116
117 return ret;
118
119 err:
120 OPENSSL_PUT_ERROR(DH, DH_R_DECODE_ERROR);
121 DH_free(ret);
122 return NULL;
123 }
124
DH_marshal_parameters(CBB * cbb,const DH * dh)125 int DH_marshal_parameters(CBB *cbb, const DH *dh) {
126 CBB child;
127 if (!CBB_add_asn1(cbb, &child, CBS_ASN1_SEQUENCE) ||
128 !marshal_integer(&child, dh->p) ||
129 !marshal_integer(&child, dh->g) ||
130 (dh->priv_length != 0 &&
131 !CBB_add_asn1_uint64(&child, dh->priv_length)) ||
132 !CBB_flush(cbb)) {
133 OPENSSL_PUT_ERROR(DH, DH_R_ENCODE_ERROR);
134 return 0;
135 }
136 return 1;
137 }
138
d2i_DHparams(DH ** out,const uint8_t ** inp,long len)139 DH *d2i_DHparams(DH **out, const uint8_t **inp, long len) {
140 if (len < 0) {
141 return NULL;
142 }
143 CBS cbs;
144 CBS_init(&cbs, *inp, (size_t)len);
145 DH *ret = DH_parse_parameters(&cbs);
146 if (ret == NULL) {
147 return NULL;
148 }
149 if (out != NULL) {
150 DH_free(*out);
151 *out = ret;
152 }
153 *inp = CBS_data(&cbs);
154 return ret;
155 }
156
i2d_DHparams(const DH * in,uint8_t ** outp)157 int i2d_DHparams(const DH *in, uint8_t **outp) {
158 CBB cbb;
159 if (!CBB_init(&cbb, 0) ||
160 !DH_marshal_parameters(&cbb, in)) {
161 CBB_cleanup(&cbb);
162 return -1;
163 }
164 return CBB_finish_i2d(&cbb, outp);
165 }
166