/* 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.]

  */

 /*

  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.

  */

 #include <stdio.h>

 #include "cryptlib.h"

 #include <openssl/bn.h>

 #include <openssl/dh.h>

 #ifndef OPENSSL_NO_ENGINE

 #include <openssl/engine.h>

 #endif

 #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))

 #include "libcrypto_wsd_macros.h"

 #include "libcrypto_wsd.h"

 #endif

 const char DH_version[]="Diffie-Hellman" OPENSSL_VERSION_PTEXT;

 #ifndef EMULATOR

 static const DH_METHOD *default_DH_method = NULL;

 #else

 GET_STATIC_VAR_FROM_TLS(default_DH_method,dh_lib,const DH_METHOD *)

 #define default_DH_method (*GET_WSD_VAR_NAME(default_DH_method,dh_lib, s)())

 #endif

 EXPORT_C void DH_set_default_method(const DH_METHOD *meth)

 	{

 	default_DH_method = meth;

 	}

 EXPORT_C const DH_METHOD *DH_get_default_method(void)

 	{

 	if(!default_DH_method)

 		default_DH_method = DH_OpenSSL();

 	return default_DH_method;

 	}

 EXPORT_C int DH_set_method(DH *dh, const DH_METHOD *meth)

 	{

 	/* NB: The caller is specifically setting a method, so it's not up to us

 	 * to deal with which ENGINE it comes from. */

         const DH_METHOD *mtmp;

         mtmp = dh->meth;

         if (mtmp->finish) mtmp->finish(dh);

 #ifndef OPENSSL_NO_ENGINE

 	if (dh->engine)

 		{

 		ENGINE_finish(dh->engine);

 		dh->engine = NULL;

 		}

 #endif

         dh->meth = meth;

         if (meth->init) meth->init(dh);

         return 1;

 	}

 EXPORT_C DH *DH_new(void)

 	{

 	return DH_new_method(NULL);

 	}

 EXPORT_C DH *DH_new_method(ENGINE *engine)

 	{

 	DH *ret;

 	ret=(DH *)OPENSSL_malloc(sizeof(DH));

 	if (ret == NULL)

 		{

 		DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE);

 		return(NULL);

 		}

 	ret->meth = DH_get_default_method();

 #ifndef OPENSSL_NO_ENGINE

 	if (engine)

 		{

 		if (!ENGINE_init(engine))

 			{

 			DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);

 			OPENSSL_free(ret);

 			return NULL;

 			}

 		ret->engine = engine;

 		}

 	else

 		ret->engine = ENGINE_get_default_DH();

 	if(ret->engine)

 		{

 		ret->meth = ENGINE_get_DH(ret->engine);

 		if(!ret->meth)

 			{

 			DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB);

 			ENGINE_finish(ret->engine);

 			OPENSSL_free(ret);

 			return NULL;

 			}

 		}

 #endif

 	ret->pad=0;

 	ret->version=0;

 	ret->p=NULL;

 	ret->g=NULL;

 	ret->length=0;

 	ret->pub_key=NULL;

 	ret->priv_key=NULL;

 	ret->q=NULL;

 	ret->j=NULL;

 	ret->seed = NULL;

 	ret->seedlen = 0;

 	ret->counter = NULL;

 	ret->method_mont_p=NULL;

 	ret->references = 1;

 	ret->flags=ret->meth->flags;

 	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);

 	if ((ret->meth->init != NULL) && !ret->meth->init(ret))

 		{

 #ifndef OPENSSL_NO_ENGINE

 		if (ret->engine)

 			ENGINE_finish(ret->engine);

 #endif

 		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);

 		OPENSSL_free(ret);

 		ret=NULL;

 		}

 	return(ret);

 	}

 EXPORT_C 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

 	if (r->meth->finish)

 		r->meth->finish(r);

 #ifndef OPENSSL_NO_ENGINE

 	if (r->engine)

 		ENGINE_finish(r->engine);

 #endif

 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);

 	if (r->p != NULL) BN_clear_free(r->p);

 	if (r->g != NULL) BN_clear_free(r->g);

 	if (r->q != NULL) BN_clear_free(r->q);

 	if (r->j != NULL) BN_clear_free(r->j);

 	if (r->seed) OPENSSL_free(r->seed);

 	if (r->counter != NULL) BN_clear_free(r->counter);

 	if (r->pub_key != NULL) BN_clear_free(r->pub_key);

 	if (r->priv_key != NULL) BN_clear_free(r->priv_key);

 	OPENSSL_free(r);

 	}

 EXPORT_C int DH_up_ref(DH *r)

 	{

 	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);

 #ifdef REF_PRINT

 	REF_PRINT("DH",r);

 #endif

 #ifdef REF_CHECK

 	if (i < 2)

 		{

 		fprintf(stderr, "DH_up, bad reference count\n");

 		abort();

 		}

 #endif

 	return ((i > 1) ? 1 : 0);

 	}

 EXPORT_C int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,

 	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)

         {

 	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp,

 				new_func, dup_func, free_func);

         }

 EXPORT_C int DH_set_ex_data(DH *d, int idx, void *arg)

 	{

 	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));

 	}

 EXPORT_C void *DH_get_ex_data(DH *d, int idx)

 	{

 	return(CRYPTO_get_ex_data(&d->ex_data,idx));

 	}

 EXPORT_C int DH_size(const DH *dh)

 	{

 	return(BN_num_bytes(dh->p));

 	}