Line data Source code
1 : /* dh_asn1.c */
2 : /*
3 : * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project
4 : * 2000.
5 : */
6 : /* ====================================================================
7 : * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
8 : *
9 : * Redistribution and use in source and binary forms, with or without
10 : * modification, are permitted provided that the following conditions
11 : * are met:
12 : *
13 : * 1. Redistributions of source code must retain the above copyright
14 : * notice, this list of conditions and the following disclaimer.
15 : *
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
19 : * distribution.
20 : *
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/)"
25 : *
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.
30 : *
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.
34 : *
35 : * 6. Redistributions of any form whatsoever must retain the following
36 : * acknowledgment:
37 : * "This product includes software developed by the OpenSSL Project
38 : * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
39 : *
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 : * ====================================================================
53 : *
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).
57 : *
58 : */
59 :
60 : #include <stdio.h>
61 : #include "cryptlib.h"
62 : #include <openssl/bn.h>
63 : #include <openssl/dh.h>
64 : #include <openssl/objects.h>
65 : #include <openssl/asn1t.h>
66 :
67 : /* Override the default free and new methods */
68 0 : static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
69 : void *exarg)
70 : {
71 0 : if (operation == ASN1_OP_NEW_PRE) {
72 0 : *pval = (ASN1_VALUE *)DH_new();
73 0 : if (*pval)
74 : return 2;
75 0 : return 0;
76 0 : } else if (operation == ASN1_OP_FREE_PRE) {
77 0 : DH_free((DH *)*pval);
78 0 : *pval = NULL;
79 0 : return 2;
80 : }
81 : return 1;
82 : }
83 :
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 : } ASN1_SEQUENCE_END_cb(DH, DHparams)
89 :
90 0 : IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)
91 :
92 : /*
93 : * Internal only structures for handling X9.42 DH: this gets translated to or
94 : * from a DH structure straight away.
95 : */
96 :
97 : typedef struct {
98 : ASN1_BIT_STRING *seed;
99 : BIGNUM *counter;
100 : } int_dhvparams;
101 :
102 : typedef struct {
103 : BIGNUM *p;
104 : BIGNUM *q;
105 : BIGNUM *g;
106 : BIGNUM *j;
107 : int_dhvparams *vparams;
108 : } int_dhx942_dh;
109 :
110 : ASN1_SEQUENCE(DHvparams) = {
111 : ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING),
112 : ASN1_SIMPLE(int_dhvparams, counter, BIGNUM)
113 : } ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams)
114 :
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 : } ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams)
122 :
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);
126 :
127 0 : IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx)
128 :
129 : /* Application leve function: read in X9.42 DH parameters into DH structure */
130 :
131 0 : DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length)
132 : {
133 : int_dhx942_dh *dhx = NULL;
134 : DH *dh = NULL;
135 0 : dh = DH_new();
136 0 : if (!dh)
137 : return NULL;
138 : dhx = d2i_int_dhx(NULL, pp, length);
139 0 : if (!dhx) {
140 0 : DH_free(dh);
141 0 : return NULL;
142 : }
143 :
144 0 : if (a) {
145 0 : if (*a)
146 0 : DH_free(*a);
147 0 : *a = dh;
148 : }
149 :
150 0 : dh->p = dhx->p;
151 0 : dh->q = dhx->q;
152 0 : dh->g = dhx->g;
153 0 : dh->j = dhx->j;
154 :
155 0 : if (dhx->vparams) {
156 0 : dh->seed = dhx->vparams->seed->data;
157 0 : dh->seedlen = dhx->vparams->seed->length;
158 0 : dh->counter = dhx->vparams->counter;
159 0 : dhx->vparams->seed->data = NULL;
160 0 : ASN1_BIT_STRING_free(dhx->vparams->seed);
161 0 : OPENSSL_free(dhx->vparams);
162 0 : dhx->vparams = NULL;
163 : }
164 :
165 0 : OPENSSL_free(dhx);
166 0 : return dh;
167 : }
168 :
169 0 : int i2d_DHxparams(const DH *dh, unsigned char **pp)
170 : {
171 : int_dhx942_dh dhx;
172 : int_dhvparams dhv;
173 : ASN1_BIT_STRING bs;
174 0 : dhx.p = dh->p;
175 0 : dhx.g = dh->g;
176 0 : dhx.q = dh->q;
177 0 : dhx.j = dh->j;
178 0 : if (dh->counter && dh->seed && dh->seedlen > 0) {
179 0 : bs.flags = ASN1_STRING_FLAG_BITS_LEFT;
180 0 : bs.data = dh->seed;
181 0 : bs.length = dh->seedlen;
182 0 : dhv.seed = &bs;
183 0 : dhv.counter = dh->counter;
184 0 : dhx.vparams = &dhv;
185 : } else
186 0 : dhx.vparams = NULL;
187 :
188 0 : return i2d_int_dhx(&dhx, pp);
189 : }
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