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
DH_set_default_method(const DH_METHOD * meth)75 void DH_set_default_method(const DH_METHOD *meth)
76 {
77 default_DH_method = meth;
78 }
79
DH_get_default_method(void)80 const DH_METHOD *DH_get_default_method(void)
81 {
82 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 default_DH_method = DH_OpenSSL();
90 #endif
91 }
92 return default_DH_method;
93 }
94
DH_set_method(DH * dh,const DH_METHOD * meth)95 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 mtmp = dh->meth;
103 if (mtmp->finish)
104 mtmp->finish(dh);
105 #ifndef OPENSSL_NO_ENGINE
106 if (dh->engine) {
107 ENGINE_finish(dh->engine);
108 dh->engine = NULL;
109 }
110 #endif
111 dh->meth = meth;
112 if (meth->init)
113 meth->init(dh);
114 return 1;
115 }
116
DH_new(void)117 DH *DH_new(void)
118 {
119 return DH_new_method(NULL);
120 }
121
DH_new_method(ENGINE * engine)122 DH *DH_new_method(ENGINE *engine)
123 {
124 DH *ret;
125
126 ret = (DH *)OPENSSL_malloc(sizeof(DH));
127 if (ret == NULL) {
128 DHerr(DH_F_DH_NEW_METHOD, ERR_R_MALLOC_FAILURE);
129 return (NULL);
130 }
131
132 ret->meth = DH_get_default_method();
133 #ifndef OPENSSL_NO_ENGINE
134 if (engine) {
135 if (!ENGINE_init(engine)) {
136 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
137 OPENSSL_free(ret);
138 return NULL;
139 }
140 ret->engine = engine;
141 } else
142 ret->engine = ENGINE_get_default_DH();
143 if (ret->engine) {
144 ret->meth = ENGINE_get_DH(ret->engine);
145 if (!ret->meth) {
146 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
147 ENGINE_finish(ret->engine);
148 OPENSSL_free(ret);
149 return NULL;
150 }
151 }
152 #endif
153
154 ret->pad = 0;
155 ret->version = 0;
156 ret->p = NULL;
157 ret->g = NULL;
158 ret->length = 0;
159 ret->pub_key = NULL;
160 ret->priv_key = NULL;
161 ret->q = NULL;
162 ret->j = NULL;
163 ret->seed = NULL;
164 ret->seedlen = 0;
165 ret->counter = NULL;
166 ret->method_mont_p = NULL;
167 ret->references = 1;
168 ret->flags = ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW;
169 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
170 if ((ret->meth->init != NULL) && !ret->meth->init(ret)) {
171 #ifndef OPENSSL_NO_ENGINE
172 if (ret->engine)
173 ENGINE_finish(ret->engine);
174 #endif
175 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
176 OPENSSL_free(ret);
177 ret = NULL;
178 }
179 return (ret);
180 }
181
DH_free(DH * r)182 void DH_free(DH *r)
183 {
184 int i;
185 if (r == NULL)
186 return;
187 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
188 #ifdef REF_PRINT
189 REF_PRINT("DH", r);
190 #endif
191 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 if (r->meth->finish)
201 r->meth->finish(r);
202 #ifndef OPENSSL_NO_ENGINE
203 if (r->engine)
204 ENGINE_finish(r->engine);
205 #endif
206
207 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
208
209 if (r->p != NULL)
210 BN_clear_free(r->p);
211 if (r->g != NULL)
212 BN_clear_free(r->g);
213 if (r->q != NULL)
214 BN_clear_free(r->q);
215 if (r->j != NULL)
216 BN_clear_free(r->j);
217 if (r->seed)
218 OPENSSL_free(r->seed);
219 if (r->counter != NULL)
220 BN_clear_free(r->counter);
221 if (r->pub_key != NULL)
222 BN_clear_free(r->pub_key);
223 if (r->priv_key != NULL)
224 BN_clear_free(r->priv_key);
225 OPENSSL_free(r);
226 }
227
DH_up_ref(DH * r)228 int DH_up_ref(DH *r)
229 {
230 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 return ((i > 1) ? 1 : 0);
241 }
242
DH_get_ex_new_index(long argl,void * argp,CRYPTO_EX_new * new_func,CRYPTO_EX_dup * dup_func,CRYPTO_EX_free * free_func)243 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 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp,
247 new_func, dup_func, free_func);
248 }
249
DH_set_ex_data(DH * d,int idx,void * arg)250 int DH_set_ex_data(DH *d, int idx, void *arg)
251 {
252 return (CRYPTO_set_ex_data(&d->ex_data, idx, arg));
253 }
254
DH_get_ex_data(DH * d,int idx)255 void *DH_get_ex_data(DH *d, int idx)
256 {
257 return (CRYPTO_get_ex_data(&d->ex_data, idx));
258 }
259
DH_size(const DH * dh)260 int DH_size(const DH *dh)
261 {
262 return (BN_num_bytes(dh->p));
263 }
264