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/* crypto/dh/dh_lib.c */
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.]
*/
#include <stdio.h>
#include "cryptlib.h"
#include <openssl/bn.h>
#include <openssl/dh.h>
const char *DH_version="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
static DH_METHOD *default_DH_method;
static int dh_meth_num = 0;
static STACK *dh_meth = NULL;
void DH_set_default_method(DH_METHOD *meth)
{
default_DH_method = meth;
}
DH_METHOD *DH_get_default_method(void)
{
if(!default_DH_method) default_DH_method = DH_OpenSSL();
return default_DH_method;
}
DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth)
{
DH_METHOD *mtmp;
mtmp = dh->meth;
if (mtmp->finish) mtmp->finish(dh);
dh->meth = meth;
if (meth->init) meth->init(dh);
return mtmp;
}
DH *DH_new(void)
{
return DH_new_method(NULL);
}
DH *DH_new_method(DH_METHOD *meth)
{
DH *ret;
ret=(DH *)Malloc(sizeof(DH));
if (ret == NULL)
{
DHerr(DH_F_DH_NEW,ERR_R_MALLOC_FAILURE);
return(NULL);
}
if(!default_DH_method) default_DH_method = DH_OpenSSL();
if(meth) ret->meth = meth;
else ret->meth = default_DH_method;
ret->pad=0;
ret->version=0;
ret->p=NULL;
ret->g=NULL;
ret->length=0;
ret->pub_key=NULL;
ret->priv_key=NULL;
ret->method_mont_p=NULL;
ret->references = 1;
ret->flags=ret->meth->flags;
if ((ret->meth->init != NULL) && !ret->meth->init(ret))
{
Free(ret);
ret=NULL;
}
else
CRYPTO_new_ex_data(dh_meth,(char *)ret,&ret->ex_data);
return(ret);
}
void DH_free(DH *r)
{
int i;
if(r == NULL) return;
i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
#ifdef REF_PRINT
REF_PRINT("DH",r);
#endif
if (i > 0) return;
#ifdef REF_CHECK
if (i < 0)
{
fprintf(stderr,"DH_free, bad reference count\n");
abort();
}
#endif
CRYPTO_free_ex_data(dh_meth, (char *)r, &r->ex_data);
if(r->meth->finish) r->meth->finish(r);
if (r->p != NULL) BN_clear_free(r->p);
if (r->g != NULL) BN_clear_free(r->g);
if (r->pub_key != NULL) BN_clear_free(r->pub_key);
if (r->priv_key != NULL) BN_clear_free(r->priv_key);
Free(r);
}
int DH_get_ex_new_index(long argl, char *argp, int (*new_func)(),
int (*dup_func)(), void (*free_func)())
{
dh_meth_num++;
return(CRYPTO_get_ex_new_index(dh_meth_num-1,
&dh_meth,argl,argp,new_func,dup_func,free_func));
}
int DH_set_ex_data(DH *d, int idx, char *arg)
{
return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
}
char *DH_get_ex_data(DH *d, int idx)
{
return(CRYPTO_get_ex_data(&d->ex_data,idx));
}
int DH_size(DH *dh)
{
return(BN_num_bytes(dh->p));
}
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