Branch data Line data Source code
1 : : /* dh_asn1.c */
2 : : /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
3 : : * project 2000.
4 : : */
5 : : /* ====================================================================
6 : : * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
7 : : *
8 : : * Redistribution and use in source and binary forms, with or without
9 : : * modification, are permitted provided that the following conditions
10 : : * are met:
11 : : *
12 : : * 1. Redistributions of source code must retain the above copyright
13 : : * notice, this list of conditions and the following disclaimer.
14 : : *
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
18 : : * distribution.
19 : : *
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/)"
24 : : *
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.
29 : : *
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.
33 : : *
34 : : * 6. Redistributions of any form whatsoever must retain the following
35 : : * acknowledgment:
36 : : * "This product includes software developed by the OpenSSL Project
37 : : * for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
38 : : *
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 : : * ====================================================================
52 : : *
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).
56 : : *
57 : : */
58 : :
59 : : #include <stdio.h>
60 : : #include "cryptlib.h"
61 : : #include <openssl/bn.h>
62 : : #include <openssl/dh.h>
63 : : #include <openssl/objects.h>
64 : : #include <openssl/asn1t.h>
65 : :
66 : : /* Override the default free and new methods */
67 : 0 : static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
68 : : void *exarg)
69 : : {
70 [ # # ]: 0 : if(operation == ASN1_OP_NEW_PRE) {
71 : 0 : *pval = (ASN1_VALUE *)DH_new();
72 [ # # ]: 0 : if(*pval) return 2;
73 : 0 : return 0;
74 [ # # ]: 0 : } else if(operation == ASN1_OP_FREE_PRE) {
75 : 0 : DH_free((DH *)*pval);
76 : 0 : *pval = NULL;
77 : 0 : return 2;
78 : : }
79 : : return 1;
80 : : }
81 : :
82 : : ASN1_SEQUENCE_cb(DHparams, dh_cb) = {
83 : : ASN1_SIMPLE(DH, p, BIGNUM),
84 : : ASN1_SIMPLE(DH, g, BIGNUM),
85 : : ASN1_OPT(DH, length, ZLONG),
86 : : } ASN1_SEQUENCE_END_cb(DH, DHparams)
87 : :
88 : 0 : IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)
89 : :
90 : : /* Internal only structures for handling X9.42 DH: this gets translated
91 : : * to or from a DH structure straight away.
92 : : */
93 : :
94 : : typedef struct
95 : : {
96 : : ASN1_BIT_STRING *seed;
97 : : BIGNUM *counter;
98 : : } int_dhvparams;
99 : :
100 : : typedef struct
101 : : {
102 : : BIGNUM *p;
103 : : BIGNUM *q;
104 : : BIGNUM *g;
105 : : BIGNUM *j;
106 : : int_dhvparams *vparams;
107 : : } int_dhx942_dh;
108 : :
109 : : ASN1_SEQUENCE(DHvparams) = {
110 : : ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING),
111 : : ASN1_SIMPLE(int_dhvparams, counter, BIGNUM)
112 : : } ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams)
113 : :
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 : : } ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams)
121 : :
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);
125 : :
126 : 4 : IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx)
127 : :
128 : : /* Application leve function: read in X9.42 DH parameters into DH structure */
129 : :
130 : 2 : DH * d2i_DHxparams(DH **a,const unsigned char **pp, long length)
131 : : {
132 : 2 : int_dhx942_dh *dhx = NULL;
133 : 2 : DH *dh = NULL;
134 : 2 : dh = DH_new();
135 [ + - ]: 2 : if (!dh)
136 : : return NULL;
137 : 2 : dhx = d2i_int_dhx(NULL, pp, length);
138 [ - + ]: 2 : if (!dhx)
139 : : {
140 : 0 : DH_free(dh);
141 : 0 : return NULL;
142 : : }
143 : :
144 [ - + ]: 2 : if (a)
145 : : {
146 [ # # ]: 0 : if (*a)
147 : 0 : DH_free(*a);
148 : 0 : *a = dh;
149 : : }
150 : :
151 : 2 : dh->p = dhx->p;
152 : 2 : dh->q = dhx->q;
153 : 2 : dh->g = dhx->g;
154 : 2 : dh->j = dhx->j;
155 : :
156 [ - + ]: 2 : if (dhx->vparams)
157 : : {
158 : 0 : dh->seed = dhx->vparams->seed->data;
159 : 0 : dh->seedlen = dhx->vparams->seed->length;
160 : 0 : dh->counter = dhx->vparams->counter;
161 : 0 : dhx->vparams->seed->data = NULL;
162 : 0 : ASN1_BIT_STRING_free(dhx->vparams->seed);
163 : 0 : OPENSSL_free(dhx->vparams);
164 : 0 : dhx->vparams = NULL;
165 : : }
166 : :
167 : 2 : OPENSSL_free(dhx);
168 : 2 : return dh;
169 : : }
170 : :
171 : 0 : int i2d_DHxparams(const DH *dh,unsigned char **pp)
172 : : {
173 : : int_dhx942_dh dhx;
174 : : int_dhvparams dhv;
175 : : ASN1_BIT_STRING bs;
176 : 0 : dhx.p = dh->p;
177 : 0 : dhx.g = dh->g;
178 : 0 : dhx.q = dh->q;
179 : 0 : dhx.j = dh->j;
180 [ # # ][ # # ]: 0 : if (dh->counter && dh->seed && dh->seedlen > 0)
[ # # ]
181 : : {
182 : 0 : bs.flags = ASN1_STRING_FLAG_BITS_LEFT;
183 : 0 : bs.data = dh->seed;
184 : 0 : bs.length = dh->seedlen;
185 : 0 : dhv.seed = &bs;
186 : 0 : dhv.counter = dh->counter;
187 : 0 : dhx.vparams = &dhv;
188 : : }
189 : : else
190 : 0 : dhx.vparams = NULL;
191 : :
192 : 0 : return i2d_int_dhx(&dhx, pp);
193 : : }
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