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git.ipfire.org Git - thirdparty/openssl.git/blob - crypto/dh/dh_lib.c
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
;
68 static int dh_meth_num
= 0;
69 static STACK_OF(CRYPTO_EX_DATA_FUNCS
) *dh_meth
= NULL
;
71 void DH_set_default_openssl_method(const DH_METHOD
*meth
)
74 /* We'll need to notify the "openssl" ENGINE of this
75 * change too. We won't bother locking things down at
76 * our end as there was never any locking in these
78 if(default_DH_method
!= meth
)
80 default_DH_method
= meth
;
81 e
= ENGINE_by_id("openssl");
84 ENGINE_set_DH(e
, meth
);
90 const DH_METHOD
*DH_get_default_openssl_method(void)
92 if(!default_DH_method
) default_DH_method
= DH_OpenSSL();
93 return default_DH_method
;
97 DH_METHOD
*DH_set_method(DH
*dh
, DH_METHOD
*meth
)
101 if (mtmp
->finish
) mtmp
->finish(dh
);
103 if (meth
->init
) meth
->init(dh
);
107 int DH_set_method(DH
*dh
, ENGINE
*engine
)
110 const DH_METHOD
*meth
;
112 meth
= ENGINE_get_DH(mtmp
);
113 if (!ENGINE_init(engine
))
115 if (meth
->finish
) meth
->finish(dh
);
117 meth
= ENGINE_get_DH(engine
);
118 if (meth
->init
) meth
->init(dh
);
119 /* SHOULD ERROR CHECK THIS!!! */
127 return DH_new_method(NULL
);
131 DH
*DH_new_method(DH_METHOD
*meth
)
133 DH
*DH_new_method(ENGINE
*engine
)
136 const DH_METHOD
*meth
;
138 ret
=(DH
*)OPENSSL_malloc(sizeof(DH
));
142 DHerr(DH_F_DH_NEW
,ERR_R_MALLOC_FAILURE
);
148 if(ENGINE_init(engine
))
149 ret
->engine
= engine
;
154 ret
->engine
=ENGINE_get_default_DH();
155 if(ret
->engine
== NULL
)
157 DHerr(DH_F_DH_NEW
,ERR_LIB_ENGINE
);
161 meth
= ENGINE_get_DH(ret
->engine
);
174 ret
->method_mont_p
=NULL
;
176 ret
->flags
=meth
->flags
;
177 CRYPTO_new_ex_data(dh_meth
,ret
,&ret
->ex_data
);
178 if ((meth
->init
!= NULL
) && !meth
->init(ret
))
180 CRYPTO_free_ex_data(dh_meth
,ret
,&ret
->ex_data
);
189 const DH_METHOD
*meth
;
191 if(r
== NULL
) return;
192 i
= CRYPTO_add(&r
->references
, -1, CRYPTO_LOCK_DH
);
200 fprintf(stderr
,"DH_free, bad reference count\n");
205 meth
= ENGINE_get_DH(r
->engine
);
206 if(meth
->finish
) meth
->finish(r
);
207 ENGINE_finish(r
->engine
);
209 CRYPTO_free_ex_data(dh_meth
, r
, &r
->ex_data
);
211 if (r
->p
!= NULL
) BN_clear_free(r
->p
);
212 if (r
->g
!= NULL
) BN_clear_free(r
->g
);
213 if (r
->q
!= NULL
) BN_clear_free(r
->q
);
214 if (r
->j
!= NULL
) BN_clear_free(r
->j
);
215 if (r
->seed
) OPENSSL_free(r
->seed
);
216 if (r
->counter
!= NULL
) BN_clear_free(r
->counter
);
217 if (r
->pub_key
!= NULL
) BN_clear_free(r
->pub_key
);
218 if (r
->priv_key
!= NULL
) BN_clear_free(r
->priv_key
);
222 int DH_get_ex_new_index(long argl
, void *argp
, CRYPTO_EX_new
*new_func
,
223 CRYPTO_EX_dup
*dup_func
, CRYPTO_EX_free
*free_func
)
226 return(CRYPTO_get_ex_new_index(dh_meth_num
-1,
227 &dh_meth
,argl
,argp
,new_func
,dup_func
,free_func
));
230 int DH_set_ex_data(DH
*d
, int idx
, void *arg
)
232 return(CRYPTO_set_ex_data(&d
->ex_data
,idx
,arg
));
235 void *DH_get_ex_data(DH
*d
, int idx
)
237 return(CRYPTO_get_ex_data(&d
->ex_data
,idx
));
240 int DH_size(const DH
*dh
)
242 return(BN_num_bytes(dh
->p
));