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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.]
60 #include "internal/cryptlib.h"
61 #include <openssl/bn.h>
62 #include <openssl/dh.h>
63 #ifndef OPENSSL_NO_ENGINE
64 # include <openssl/engine.h>
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
)
84 * NB: The caller is specifically setting a method, so it's not up to us
85 * to deal with which ENGINE it comes from.
87 const DH_METHOD
*mtmp
;
91 #ifndef OPENSSL_NO_ENGINE
93 ENGINE_finish(dh
->engine
);
105 return DH_new_method(NULL
);
108 DH
*DH_new_method(ENGINE
*engine
)
110 DH
*ret
= OPENSSL_malloc(sizeof(*ret
));
113 DHerr(DH_F_DH_NEW_METHOD
, ERR_R_MALLOC_FAILURE
);
117 ret
->meth
= DH_get_default_method();
118 #ifndef OPENSSL_NO_ENGINE
120 if (!ENGINE_init(engine
)) {
121 DHerr(DH_F_DH_NEW_METHOD
, ERR_R_ENGINE_LIB
);
125 ret
->engine
= engine
;
127 ret
->engine
= ENGINE_get_default_DH();
129 ret
->meth
= ENGINE_get_DH(ret
->engine
);
131 DHerr(DH_F_DH_NEW_METHOD
, ERR_R_ENGINE_LIB
);
132 ENGINE_finish(ret
->engine
);
145 ret
->priv_key
= NULL
;
151 ret
->method_mont_p
= NULL
;
153 ret
->flags
= ret
->meth
->flags
;
154 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH
, ret
, &ret
->ex_data
);
155 if ((ret
->meth
->init
!= NULL
) && !ret
->meth
->init(ret
)) {
156 #ifndef OPENSSL_NO_ENGINE
158 ENGINE_finish(ret
->engine
);
160 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH
, ret
, &ret
->ex_data
);
173 i
= CRYPTO_add(&r
->references
, -1, CRYPTO_LOCK_DH
);
181 fprintf(stderr
, "DH_free, bad reference count\n");
188 #ifndef OPENSSL_NO_ENGINE
190 ENGINE_finish(r
->engine
);
193 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH
, r
, &r
->ex_data
);
199 OPENSSL_free(r
->seed
);
200 BN_clear_free(r
->counter
);
201 BN_clear_free(r
->pub_key
);
202 BN_clear_free(r
->priv_key
);
208 int i
= CRYPTO_add(&r
->references
, 1, CRYPTO_LOCK_DH
);
214 fprintf(stderr
, "DH_up, bad reference count\n");
218 return ((i
> 1) ? 1 : 0);
221 int DH_get_ex_new_index(long argl
, void *argp
, CRYPTO_EX_new
*new_func
,
222 CRYPTO_EX_dup
*dup_func
, CRYPTO_EX_free
*free_func
)
224 return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH
, argl
, argp
,
225 new_func
, dup_func
, free_func
);
228 int DH_set_ex_data(DH
*d
, int idx
, void *arg
)
230 return (CRYPTO_set_ex_data(&d
->ex_data
, idx
, arg
));
233 void *DH_get_ex_data(DH
*d
, int idx
)
235 return (CRYPTO_get_ex_data(&d
->ex_data
, idx
));
238 int DH_bits(const DH
*dh
)
240 return BN_num_bits(dh
->p
);
243 int DH_size(const DH
*dh
)
245 return (BN_num_bytes(dh
->p
));
248 int DH_security_bits(const DH
*dh
)
252 N
= BN_num_bits(dh
->q
);
257 return BN_security_bits(BN_num_bits(dh
->p
), N
);