1 /* crypto/dh/dh_lib.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
61 #include <openssl/bn.h>
62 #include <openssl/dh.h>
63 #include <openssl/engine.h>
65 const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
67 static const DH_METHOD *default_DH_method = NULL;
69 void DH_set_default_method(const DH_METHOD *meth)
71 default_DH_method = meth;
74 const DH_METHOD *DH_get_default_method(void)
76 if(!default_DH_method)
77 default_DH_method = DH_OpenSSL();
78 return default_DH_method;
81 int DH_set_method(DH *dh, const DH_METHOD *meth)
83 /* NB: The caller is specifically setting a method, so it's not up to us
84 * to deal with which ENGINE it comes from. */
85 const DH_METHOD *mtmp;
87 if (mtmp->finish) mtmp->finish(dh);
90 ENGINE_finish(dh->engine);
94 if (meth->init) meth->init(dh);
100 return DH_new_method(NULL);
103 DH *DH_new_method(ENGINE *engine)
107 ret=(DH *)OPENSSL_malloc(sizeof(DH));
110 DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
114 ret->meth = DH_get_default_method();
115 ret->engine = engine;
117 ret->engine = ENGINE_get_default_DH();
120 ret->meth = ENGINE_get_DH(ret->engine);
123 DHerr(DH_F_DH_NEW,ERR_R_ENGINE_LIB);
124 ENGINE_finish(ret->engine);
142 ret->method_mont_p=NULL;
144 ret->flags=ret->meth->flags;
145 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
146 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
148 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
158 if(r == NULL) return;
159 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
167 fprintf(stderr,"DH_free, bad reference count\n");
175 ENGINE_finish(r->engine);
177 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
179 if (r->p != NULL) BN_clear_free(r->p);
180 if (r->g != NULL) BN_clear_free(r->g);
181 if (r->q != NULL) BN_clear_free(r->q);
182 if (r->j != NULL) BN_clear_free(r->j);
183 if (r->seed) OPENSSL_free(r->seed);
184 if (r->counter != NULL) BN_clear_free(r->counter);
185 if (r->pub_key != NULL) BN_clear_free(r->pub_key);
186 if (r->priv_key != NULL) BN_clear_free(r->priv_key);
192 int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
199 fprintf(stderr, "DH_up, bad reference count\n");
203 return ((i > 1) ? 1 : 0);
206 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
207 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
209 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp,
210 new_func, dup_func, free_func);
213 int DH_set_ex_data(DH *d, int idx, void *arg)
215 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
218 void *DH_get_ex_data(DH *d, int idx)
220 return(CRYPTO_get_ex_data(&d->ex_data,idx));
223 int DH_size(const DH *dh)
225 return(BN_num_bytes(dh->p));