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 void DH_set_default_method(const DH_METHOD *meth)
76 {
77 default_DH_method = meth;
78 }
79
80 const DH_METHOD *DH_get_default_method(void)
81 {
82 if(!default_DH_method)
83 {
84 #ifdef OPENSSL_FIPS
85 if (FIPS_mode())
86 return FIPS_dh_openssl();
87 else
88 return DH_OpenSSL();
89 #else
90 default_DH_method = DH_OpenSSL();
91 #endif
92 }
93 return default_DH_method;
94 }
95
96 int DH_set_method(DH *dh, const DH_METHOD *meth)
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 const DH_METHOD *mtmp;
101 mtmp = dh->meth;
102 if (mtmp->finish) mtmp->finish(dh);
103 #ifndef OPENSSL_NO_ENGINE
104 if (dh->engine)
105 {
106 ENGINE_finish(dh->engine);
107 dh->engine = NULL;
108 }
109 #endif
110 dh->meth = meth;
111 if (meth->init) meth->init(dh);
112 return 1;
113 }
114
115 DH *DH_new(void)
116 {
117 return DH_new_method(NULL);
118 }
119
120 DH *DH_new_method(ENGINE *engine)
121 {
122 DH *ret;
123
124 ret=(DH *)OPENSSL_malloc(sizeof(DH));
125 if (ret == NULL)
126 {
127 DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE);
128 return(NULL);
129 }
130
131 ret->meth = DH_get_default_method();
132 #ifndef OPENSSL_NO_ENGINE
133 if (engine)
134 {
135 if (!ENGINE_init(engine))
136 {
137 DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
138 OPENSSL_free(ret);
139 return NULL;
140 }
141 ret->engine = engine;
142 }
143 else
144 ret->engine = ENGINE_get_default_DH();
145 if(ret->engine)
146 {
147 ret->meth = ENGINE_get_DH(ret->engine);
148 if(!ret->meth)
149 {
150 DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB);
151 ENGINE_finish(ret->engine);
152 OPENSSL_free(ret);
153 return NULL;
154 }
155 }
156 #endif
157
158 ret->pad=0;
159 ret->version=0;
160 ret->p=NULL;
161 ret->g=NULL;
162 ret->length=0;
163 ret->pub_key=NULL;
164 ret->priv_key=NULL;
165 ret->q=NULL;
166 ret->j=NULL;
167 ret->seed = NULL;
168 ret->seedlen = 0;
169 ret->counter = NULL;
170 ret->method_mont_p=NULL;
171 ret->references = 1;
172 ret->flags=ret->meth->flags & ~DH_FLAG_NON_FIPS_ALLOW;
173 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
174 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
175 {
176 #ifndef OPENSSL_NO_ENGINE
177 if (ret->engine)
178 ENGINE_finish(ret->engine);
179 #endif
180 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
181 OPENSSL_free(ret);
182 ret=NULL;
183 }
184 return(ret);
185 }
186
187 void DH_free(DH *r)
188 {
189 int i;
190 if(r == NULL) return;
191 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
192 #ifdef REF_PRINT
193 REF_PRINT("DH",r);
194 #endif
195 if (i > 0) return;
196 #ifdef REF_CHECK
197 if (i < 0)
198 {
199 fprintf(stderr,"DH_free, bad reference count\n");
200 abort();
201 }
202 #endif
203
204 if (r->meth->finish)
205 r->meth->finish(r);
206 #ifndef OPENSSL_NO_ENGINE
207 if (r->engine)
208 ENGINE_finish(r->engine);
209 #endif
210
211 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
212
213 if (r->p != NULL) BN_clear_free(r->p);
214 if (r->g != NULL) BN_clear_free(r->g);
215 if (r->q != NULL) BN_clear_free(r->q);
216 if (r->j != NULL) BN_clear_free(r->j);
217 if (r->seed) OPENSSL_free(r->seed);
218 if (r->counter != NULL) BN_clear_free(r->counter);
219 if (r->pub_key != NULL) BN_clear_free(r->pub_key);
220 if (r->priv_key != NULL) BN_clear_free(r->priv_key);
221 OPENSSL_free(r);
222 }
223
224 int DH_up_ref(DH *r)
225 {
226 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
227 #ifdef REF_PRINT
228 REF_PRINT("DH",r);
229 #endif
230 #ifdef REF_CHECK
231 if (i < 2)
232 {
233 fprintf(stderr, "DH_up, bad reference count\n");
234 abort();
235 }
236 #endif
237 return ((i > 1) ? 1 : 0);
238 }
239
240 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
241 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
242 {
243 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp,
244 new_func, dup_func, free_func);
245 }
246
247 int DH_set_ex_data(DH *d, int idx, void *arg)
248 {
249 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
250 }
251
252 void *DH_get_ex_data(DH *d, int idx)
253 {
254 return(CRYPTO_get_ex_data(&d->ex_data,idx));
255 }
256
257 int DH_size(const DH *dh)
258 {
259 return(BN_num_bytes(dh->p));
260 }