Line data Source code
1 : /* crypto/dh/dh_lib.c */
2 : /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3 : * All rights reserved.
4 : *
5 : * This package is an SSL implementation written
6 : * by Eric Young (eay@cryptsoft.com).
7 : * The implementation was written so as to conform with Netscapes SSL.
8 : *
9 : * This library is free for commercial and non-commercial use as long as
10 : * the following conditions are aheared to. The following conditions
11 : * apply to all code found in this distribution, be it the RC4, RSA,
12 : * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 : * included with this distribution is covered by the same copyright terms
14 : * except that the holder is Tim Hudson (tjh@cryptsoft.com).
15 : *
16 : * Copyright remains Eric Young's, and as such any Copyright notices in
17 : * the code are not to be removed.
18 : * If this package is used in a product, Eric Young should be given attribution
19 : * as the author of the parts of the library used.
20 : * This can be in the form of a textual message at program startup or
21 : * in documentation (online or textual) provided with the package.
22 : *
23 : * Redistribution and use in source and binary forms, with or without
24 : * modification, are permitted provided that the following conditions
25 : * are met:
26 : * 1. Redistributions of source code must retain the copyright
27 : * notice, this list of conditions and the following disclaimer.
28 : * 2. Redistributions in binary form must reproduce the above copyright
29 : * notice, this list of conditions and the following disclaimer in the
30 : * documentation and/or other materials provided with the distribution.
31 : * 3. All advertising materials mentioning features or use of this software
32 : * must display the following acknowledgement:
33 : * "This product includes cryptographic software written by
34 : * Eric Young (eay@cryptsoft.com)"
35 : * The word 'cryptographic' can be left out if the rouines from the library
36 : * being used are not cryptographic related :-).
37 : * 4. If you include any Windows specific code (or a derivative thereof) from
38 : * the apps directory (application code) you must include an acknowledgement:
39 : * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40 : *
41 : * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 : * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 : * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 : * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 : * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 : * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 : * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 : * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 : * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 : * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51 : * SUCH DAMAGE.
52 : *
53 : * The licence and distribution terms for any publically available version or
54 : * derivative of this code cannot be changed. i.e. this code cannot simply be
55 : * copied and put under another distribution licence
56 : * [including the GNU Public Licence.]
57 : */
58 :
59 : #include <stdio.h>
60 : #include "cryptlib.h"
61 : #include <openssl/bn.h>
62 : #include <openssl/dh.h>
63 : #ifndef OPENSSL_NO_ENGINE
64 : # include <openssl/engine.h>
65 : #endif
66 :
67 : #ifdef OPENSSL_FIPS
68 : # include <openssl/fips.h>
69 : #endif
70 :
71 : const char DH_version[] = "Diffie-Hellman" OPENSSL_VERSION_PTEXT;
72 :
73 : static const DH_METHOD *default_DH_method = NULL;
74 :
75 0 : void DH_set_default_method(const DH_METHOD *meth)
76 : {
77 0 : default_DH_method = meth;
78 0 : }
79 :
80 0 : const DH_METHOD *DH_get_default_method(void)
81 : {
82 0 : if (!default_DH_method) {
83 : #ifdef OPENSSL_FIPS
84 : if (FIPS_mode())
85 : return FIPS_dh_openssl();
86 : else
87 : return DH_OpenSSL();
88 : #else
89 0 : default_DH_method = DH_OpenSSL();
90 : #endif
91 : }
92 0 : return default_DH_method;
93 : }
94 :
95 0 : int DH_set_method(DH *dh, const DH_METHOD *meth)
96 : {
97 : /*
98 : * NB: The caller is specifically setting a method, so it's not up to us
99 : * to deal with which ENGINE it comes from.
100 : */
101 : const DH_METHOD *mtmp;
102 0 : mtmp = dh->meth;
103 0 : if (mtmp->finish)
104 0 : mtmp->finish(dh);
105 : #ifndef OPENSSL_NO_ENGINE
106 0 : if (dh->engine) {
107 0 : ENGINE_finish(dh->engine);
108 0 : dh->engine = NULL;
109 : }
110 : #endif
111 0 : dh->meth = meth;
112 0 : if (meth->init)
113 0 : meth->init(dh);
114 0 : return 1;
115 : }
116 :
117 0 : DH *DH_new(void)
118 : {
119 0 : return DH_new_method(NULL);
120 : }
121 :
122 0 : DH *DH_new_method(ENGINE *engine)
123 : {
124 : DH *ret;
125 :
126 0 : ret = (DH *)OPENSSL_malloc(sizeof(DH));
127 0 : if (ret == NULL) {
128 0 : DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
129 0 : return (NULL);
130 : }
131 :
132 0 : ret->meth = DH_get_default_method();
133 : #ifndef OPENSSL_NO_ENGINE
134 0 : if (engine) {
135 0 : if (!ENGINE_init(engine)) {
136 0 : DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
137 0 : OPENSSL_free(ret);
138 0 : return NULL;
139 : }
140 0 : ret->engine = engine;
141 : } else
142 0 : ret->engine = ENGINE_get_default_DH();
143 0 : if (ret->engine) {
144 0 : ret->meth = ENGINE_get_DH(ret->engine);
145 0 : if (!ret->meth) {
146 0 : DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
147 0 : ENGINE_finish(ret->engine);
148 0 : OPENSSL_free(ret);
149 0 : return NULL;
150 : }
151 : }
152 : #endif
153 :
154 0 : ret->pad = 0;
155 0 : ret->version = 0;
156 0 : ret->p = NULL;
157 0 : ret->g = NULL;
158 0 : ret->length = 0;
159 0 : ret->pub_key = NULL;
160 0 : ret->priv_key = NULL;
161 0 : ret->q = NULL;
162 0 : ret->j = NULL;
163 0 : ret->seed = NULL;
164 0 : ret->seedlen = 0;
165 0 : ret->counter = NULL;
166 0 : ret->method_mont_p = NULL;
167 0 : ret->references = 1;
168 0 : ret->flags = ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW;
169 0 : CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
170 0 : if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
171 : #ifndef OPENSSL_NO_ENGINE
172 0 : if (ret->engine)
173 0 : ENGINE_finish(ret->engine);
174 : #endif
175 0 : CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
176 0 : OPENSSL_free(ret);
177 : ret = NULL;
178 : }
179 0 : return (ret);
180 : }
181 :
182 0 : void DH_free(DH *r)
183 : {
184 : int i;
185 0 : if (r == NULL)
186 : return;
187 0 : i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
188 : #ifdef REF_PRINT
189 : REF_PRINT("DH", r);
190 : #endif
191 0 : if (i > 0)
192 : return;
193 : #ifdef REF_CHECK
194 : if (i < 0) {
195 : fprintf(stderr, "DH_free, bad reference count\n");
196 : abort();
197 : }
198 : #endif
199 :
200 0 : if (r->meth->finish)
201 0 : r->meth->finish(r);
202 : #ifndef OPENSSL_NO_ENGINE
203 0 : if (r->engine)
204 0 : ENGINE_finish(r->engine);
205 : #endif
206 :
207 0 : CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
208 :
209 0 : if (r->p != NULL)
210 0 : BN_clear_free(r->p);
211 0 : if (r->g != NULL)
212 0 : BN_clear_free(r->g);
213 0 : if (r->q != NULL)
214 0 : BN_clear_free(r->q);
215 0 : if (r->j != NULL)
216 0 : BN_clear_free(r->j);
217 0 : if (r->seed)
218 0 : OPENSSL_free(r->seed);
219 0 : if (r->counter != NULL)
220 0 : BN_clear_free(r->counter);
221 0 : if (r->pub_key != NULL)
222 0 : BN_clear_free(r->pub_key);
223 0 : if (r->priv_key != NULL)
224 0 : BN_clear_free(r->priv_key);
225 0 : OPENSSL_free(r);
226 : }
227 :
228 0 : int DH_up_ref(DH *r)
229 : {
230 0 : int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
231 : #ifdef REF_PRINT
232 : REF_PRINT("DH", r);
233 : #endif
234 : #ifdef REF_CHECK
235 : if (i < 2) {
236 : fprintf(stderr, "DH_up, bad reference count\n");
237 : abort();
238 : }
239 : #endif
240 0 : return ((i > 1) ? 1 : 0);
241 : }
242 :
243 0 : int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
244 : CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
245 : {
246 0 : return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp,
247 : new_func, dup_func, free_func);
248 : }
249 :
250 0 : int DH_set_ex_data(DH *d, int idx, void *arg)
251 : {
252 0 : return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
253 : }
254 :
255 0 : void *DH_get_ex_data(DH *d, int idx)
256 : {
257 0 : return (CRYPTO_get_ex_data(&d->ex_data, idx));
258 : }
259 :
260 0 : int DH_size(const DH *dh)
261 : {
262 0 : return (BN_num_bytes(dh->p));
263 : }
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