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9d6b1ce6 | 1 | /* dh_asn1.c */ |
2e597528 | 2 | /* Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL |
9d6b1ce6 | 3 | * project 2000. |
e76f935e DSH |
4 | */ |
5 | /* ==================================================================== | |
24484759 | 6 | * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved. |
e76f935e DSH |
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" | |
9d6b1ce6 DSH |
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 */ |
24484759 DSH |
67 | static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, |
68 | void *exarg) | |
e76f935e | 69 | { |
9d6b1ce6 DSH |
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; | |
e76f935e DSH |
80 | } |
81 | ||
9d6b1ce6 DSH |
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), | |
d339187b | 86 | } ASN1_SEQUENCE_END_cb(DH, DHparams) |
9d6b1ce6 DSH |
87 | |
88 | IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams) | |
f4274da1 | 89 | |
afb14cda DSH |
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 | 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 | DH * d2i_DHxparams(DH **a,const unsigned char **pp, long length) | |
131 | { | |
132 | int_dhx942_dh *dhx = NULL; | |
133 | DH *dh = NULL; | |
134 | dh = DH_new(); | |
135 | if (!dh) | |
136 | return NULL; | |
137 | dhx = d2i_int_dhx(NULL, pp, length); | |
138 | if (!dhx) | |
139 | { | |
140 | DH_free(dh); | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | if (a) | |
145 | { | |
146 | if (*a) | |
147 | DH_free(*a); | |
148 | *a = dh; | |
149 | } | |
150 | ||
151 | dh->p = dhx->p; | |
152 | dh->q = dhx->q; | |
153 | dh->g = dhx->g; | |
154 | dh->j = dhx->j; | |
155 | ||
156 | if (dhx->vparams) | |
157 | { | |
158 | dh->seed = dhx->vparams->seed->data; | |
159 | dh->seedlen = dhx->vparams->seed->length; | |
160 | dh->counter = dhx->vparams->counter; | |
161 | dhx->vparams->seed->data = NULL; | |
162 | ASN1_BIT_STRING_free(dhx->vparams->seed); | |
163 | OPENSSL_free(dhx->vparams); | |
164 | dhx->vparams = NULL; | |
165 | } | |
166 | ||
167 | OPENSSL_free(dhx); | |
168 | return dh; | |
169 | } | |
170 | ||
171 | 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 | dhx.p = dh->p; | |
177 | dhx.g = dh->g; | |
178 | dhx.q = dh->q; | |
179 | dhx.j = dh->j; | |
180 | if (dh->counter && dh->seed && dh->seedlen > 0) | |
181 | { | |
182 | bs.flags = ASN1_STRING_FLAG_BITS_LEFT; | |
183 | bs.data = dh->seed; | |
184 | bs.length = dh->seedlen; | |
185 | dhv.seed = &bs; | |
186 | dhv.counter = dh->counter; | |
187 | dhx.vparams = &dhv; | |
188 | } | |
189 | else | |
190 | dhx.vparams = NULL; | |
191 | ||
192 | return i2d_int_dhx(&dhx, pp); | |
193 | } |