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>
64 const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
66 static DH_METHOD *default_DH_method;
67 static int dh_meth_num = 0;
68 static STACK_OF(CRYPTO_EX_DATA_FUNCS) *dh_meth = NULL;
70 void DH_set_default_method(DH_METHOD *meth)
72 default_DH_method = meth;
75 DH_METHOD *DH_get_default_method(void)
77 if(!default_DH_method) default_DH_method = DH_OpenSSL();
78 return default_DH_method;
81 DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth)
85 if (mtmp->finish) mtmp->finish(dh);
87 if (meth->init) meth->init(dh);
93 return DH_new_method(NULL);
96 DH *DH_new_method(DH_METHOD *meth)
99 ret=(DH *)OPENSSL_malloc(sizeof(DH));
103 DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
106 if(meth) ret->meth = meth;
107 else ret->meth = DH_get_default_method();
120 ret->method_mont_p=NULL;
122 ret->flags=ret->meth->flags;
123 if ((ret->meth->init != NULL) && !ret->meth->init(ret))
129 CRYPTO_new_ex_data(dh_meth,ret,&ret->ex_data);
136 if(r == NULL) return;
137 i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
145 fprintf(stderr,"DH_free, bad reference count\n");
150 CRYPTO_free_ex_data(dh_meth, r, &r->ex_data);
152 if(r->meth->finish) r->meth->finish(r);
154 if (r->p != NULL) BN_clear_free(r->p);
155 if (r->g != NULL) BN_clear_free(r->g);
156 if (r->q != NULL) BN_clear_free(r->q);
157 if (r->j != NULL) BN_clear_free(r->j);
158 if (r->seed) OPENSSL_free(r->seed);
159 if (r->counter != NULL) BN_clear_free(r->counter);
160 if (r->pub_key != NULL) BN_clear_free(r->pub_key);
161 if (r->priv_key != NULL) BN_clear_free(r->priv_key);
165 int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
166 CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
169 return(CRYPTO_get_ex_new_index(dh_meth_num-1,
170 &dh_meth,argl,argp,new_func,dup_func,free_func));
173 int DH_set_ex_data(DH *d, int idx, void *arg)
175 return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
178 void *DH_get_ex_data(DH *d, int idx)
180 return(CRYPTO_get_ex_data(&d->ex_data,idx));
185 return(BN_num_bytes(dh->p));