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9d6b1ce6 | 1 | /* dh_asn1.c */ |
ae5c8664 MC |
2 | /* |
3 | * Written by Dr Stephen N Henson (steve@openssl.org) for the OpenSSL project | |
4 | * 2000. | |
e76f935e DSH |
5 | */ |
6 | /* ==================================================================== | |
24484759 | 7 | * Copyright (c) 2000-2005 The OpenSSL Project. All rights reserved. |
e76f935e DSH |
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 | |
ae5c8664 | 14 | * notice, this list of conditions and the following disclaimer. |
e76f935e DSH |
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" | |
9d6b1ce6 DSH |
62 | #include <openssl/bn.h> |
63 | #include <openssl/dh.h> | |
64 | #include <openssl/objects.h> | |
65 | #include <openssl/asn1t.h> | |
e76f935e | 66 | |
9d6b1ce6 | 67 | /* Override the default free and new methods */ |
24484759 | 68 | static int dh_cb(int operation, ASN1_VALUE **pval, const ASN1_ITEM *it, |
ae5c8664 | 69 | void *exarg) |
e76f935e | 70 | { |
ae5c8664 MC |
71 | if (operation == ASN1_OP_NEW_PRE) { |
72 | *pval = (ASN1_VALUE *)DH_new(); | |
73 | if (*pval) | |
74 | return 2; | |
75 | return 0; | |
76 | } else if (operation == ASN1_OP_FREE_PRE) { | |
77 | DH_free((DH *)*pval); | |
78 | *pval = NULL; | |
79 | return 2; | |
80 | } | |
81 | return 1; | |
e76f935e DSH |
82 | } |
83 | ||
9d6b1ce6 | 84 | ASN1_SEQUENCE_cb(DHparams, dh_cb) = { |
ae5c8664 MC |
85 | ASN1_SIMPLE(DH, p, BIGNUM), |
86 | ASN1_SIMPLE(DH, g, BIGNUM), | |
87 | ASN1_OPT(DH, length, ZLONG), | |
d339187b | 88 | } ASN1_SEQUENCE_END_cb(DH, DHparams) |
9d6b1ce6 DSH |
89 | |
90 | IMPLEMENT_ASN1_ENCODE_FUNCTIONS_const_fname(DH, DHparams, DHparams) | |
6c29853b | 91 | |
ae5c8664 MC |
92 | /* |
93 | * Internal only structures for handling X9.42 DH: this gets translated to or | |
94 | * from a DH structure straight away. | |
491734eb DSH |
95 | */ |
96 | ||
ae5c8664 MC |
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; | |
491734eb DSH |
109 | |
110 | ASN1_SEQUENCE(DHvparams) = { | |
ae5c8664 MC |
111 | ASN1_SIMPLE(int_dhvparams, seed, ASN1_BIT_STRING), |
112 | ASN1_SIMPLE(int_dhvparams, counter, BIGNUM) | |
491734eb DSH |
113 | } ASN1_SEQUENCE_END_name(int_dhvparams, DHvparams) |
114 | ||
115 | ASN1_SEQUENCE(DHxparams) = { | |
ae5c8664 MC |
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), | |
491734eb DSH |
121 | } ASN1_SEQUENCE_END_name(int_dhx942_dh, DHxparams) |
122 | ||
ae5c8664 MC |
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); | |
491734eb DSH |
126 | |
127 | 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 | ||
ae5c8664 MC |
131 | DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length) |
132 | { | |
133 | int_dhx942_dh *dhx = NULL; | |
134 | DH *dh = NULL; | |
135 | dh = DH_new(); | |
136 | if (!dh) | |
137 | return NULL; | |
138 | dhx = d2i_int_dhx(NULL, pp, length); | |
139 | if (!dhx) { | |
140 | DH_free(dh); | |
141 | return NULL; | |
142 | } | |
143 | ||
144 | if (a) { | |
145 | if (*a) | |
146 | DH_free(*a); | |
147 | *a = dh; | |
148 | } | |
149 | ||
150 | dh->p = dhx->p; | |
151 | dh->q = dhx->q; | |
152 | dh->g = dhx->g; | |
153 | dh->j = dhx->j; | |
154 | ||
155 | if (dhx->vparams) { | |
156 | dh->seed = dhx->vparams->seed->data; | |
157 | dh->seedlen = dhx->vparams->seed->length; | |
158 | dh->counter = dhx->vparams->counter; | |
159 | dhx->vparams->seed->data = NULL; | |
160 | ASN1_BIT_STRING_free(dhx->vparams->seed); | |
161 | OPENSSL_free(dhx->vparams); | |
162 | dhx->vparams = NULL; | |
163 | } | |
164 | ||
165 | OPENSSL_free(dhx); | |
166 | return dh; | |
167 | } | |
168 | ||
169 | 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 | dhx.p = dh->p; | |
175 | dhx.g = dh->g; | |
176 | dhx.q = dh->q; | |
177 | dhx.j = dh->j; | |
178 | if (dh->counter && dh->seed && dh->seedlen > 0) { | |
179 | bs.flags = ASN1_STRING_FLAG_BITS_LEFT; | |
180 | bs.data = dh->seed; | |
181 | bs.length = dh->seedlen; | |
182 | dhv.seed = &bs; | |
183 | dhv.counter = dh->counter; | |
184 | dhx.vparams = &dhv; | |
185 | } else | |
186 | dhx.vparams = NULL; | |
187 | ||
188 | return i2d_int_dhx(&dhx, pp); | |
189 | } |