]> git.ipfire.org Git - thirdparty/openssl.git/blame - crypto/dh/dh_asn1.c
Initial experimental support for X9.42 DH parameter format to handle
[thirdparty/openssl.git] / crypto / dh / dh_asn1.c
CommitLineData
9d6b1ce6 1/* dh_asn1.c */
2e597528 2/* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL
9d6b1ce6 3 * project 2000.
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4 */
5/* ====================================================================
24484759 6 * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved.
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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"
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61#include <openssl/bn.h>
62#include <openssl/dh.h>
63#include <openssl/objects.h>
64#include <openssl/asn1t.h>
e76f935e 65
9d6b1ce6 66/* Override the default free and new methods */
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67static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it,
68 void *exarg)
e76f935e 69{
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70 if(operation == ASN1_OP_NEW_PRE) {
71 *pval = (ASN1_VALUE *)DH_new();
72 if(*pval) return 2;
73 return 0;
74 } else if(operation == ASN1_OP_FREE_PRE) {
75 DH_free((DH *)*pval);
76 *pval = NULL;
77 return 2;
78 }
79 return 1;
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80}
81
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82ASN1_SEQUENCE_cb(DHparams, dh_cb) = {
83 ASN1_SIMPLE(DH, p, BIGNUM),
84 ASN1_SIMPLE(DH, g, BIGNUM),
85 ASN1_OPT(DH, length, ZLONG),
d339187b 86} ASN1_SEQUENCE_END_cb(DH, DHparams)
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87
88IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams)
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89
90DH *DHparams_dup(DH *dh)
91 {
92 return ASN1_item_dup(ASN1_ITEM_rptr(DHparams), dh);
93 }
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94
95/* Internal only structures for handling X9.42 DH: this gets translated
96 * to or from a DH structure straight away.
97 */
98
99typedef struct
100 {
101 ASN1_BIT_STRING *seed;
102 BIGNUM *counter;
103 } int_dhvparams;
104
105typedef struct
106 {
107 BIGNUM *p;
108 BIGNUM *q;
109 BIGNUM *g;
110 BIGNUM *j;
111 int_dhvparams *vparams;
112 } int_dhx942_dh;
113
114ASN1_SEQUENCE(DHvparams) = {
115 ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING),
116 ASN1_SIMPLE(int_dhvparams, counter, BIGNUM)
117} ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams)
118
119ASN1_SEQUENCE(DHxparams) = {
120 ASN1_SIMPLE(int_dhx942_dh, p, BIGNUM),
121 ASN1_SIMPLE(int_dhx942_dh, g, BIGNUM),
122 ASN1_SIMPLE(int_dhx942_dh, q, BIGNUM),
123 ASN1_OPT(int_dhx942_dh, j, BIGNUM),
124 ASN1_OPT(int_dhx942_dh, vparams, DHvparams),
125} ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams)
126
127int_dhx942_dh * d2i_int_dhx(int_dhx942_dh **a,
128 const unsigned char **pp, long length);
129int i2d_int_dhx(const int_dhx942_dh *a,unsigned char **pp);
130
131IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(int_dhx942_dh, DHxparams, int_dhx)
132
133/* Application leve function: read in X9.42 DH parameters into DH structure */
134
135DH * d2i_DHxparams(DH **a,const unsigned char **pp, long length)
136 {
137 int_dhx942_dh *dhx = NULL;
138 DH *dh = NULL;
139 dh = DH_new();
140 if (!dh)
141 return NULL;
142 dhx = d2i_int_dhx(NULL, pp, length);
143 if (!dhx)
144 {
145 DH_free(dh);
146 return NULL;
147 }
148
149 if (a)
150 {
151 if (*a)
152 DH_free(*a);
153 *a = dh;
154 }
155
156 dh->p = dhx->p;
157 dh->q = dhx->q;
158 dh->g = dhx->g;
159 dh->j = dhx->j;
160
161 if (dhx->vparams)
162 {
163 dh->seed = dhx->vparams->seed->data;
164 dh->seedlen = dhx->vparams->seed->length;
165 dh->counter = dhx->vparams->counter;
166 dhx->vparams->seed->data = NULL;
167 ASN1_BIT_STRING_free(dhx->vparams->seed);
168 OPENSSL_free(dhx->vparams);
169 dhx->vparams = NULL;
170 }
171
172 OPENSSL_free(dhx);
173 return dh;
174 }
175
176int i2d_DHxparams(const DH *dh,unsigned char **pp)
177 {
178 int_dhx942_dh dhx;
179 int_dhvparams dhv;
180 ASN1_BIT_STRING bs;
181 dhx.p = dh->p;
182 dhx.g = dh->g;
183 dhx.q = dh->q;
184 dhx.j = dh->j;
185 if (dh->counter && dh->seed && dh->seedlen > 0)
186 {
187 bs.flags = ASN1_STRING_FLAG_BITS_LEFT;
188 bs.data = dh->seed;
189 bs.length = dh->seedlen;
190 dhv.seed = &bs;
191 dhv.counter = dh->counter;
192 dhx.vparams = &dhv;
193 }
194 else
195 dhx.vparams = NULL;
196
197 return i2d_int_dhx(&dhx, pp);
198 }