sl@0: /* crypto/dh/dh_lib.c */
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: 
sl@0: #include <stdio.h>
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/bn.h>
sl@0: #include <openssl/dh.h>
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: #include <openssl/engine.h>
sl@0: #endif
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: const char DH_version[]="Diffie-Hellman" OPENSSL_VERSION_PTEXT;
sl@0: 
sl@0: #ifndef EMULATOR
sl@0: static const DH_METHOD *default_DH_method = NULL;
sl@0: #else
sl@0: GET_STATIC_VAR_FROM_TLS(default_DH_method,dh_lib,const DH_METHOD *)
sl@0: #define default_DH_method (*GET_WSD_VAR_NAME(default_DH_method,dh_lib, s)())
sl@0: #endif
sl@0: 
sl@0: EXPORT_C void DH_set_default_method(const DH_METHOD *meth)
sl@0: 	{
sl@0: 	default_DH_method = meth;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C const DH_METHOD *DH_get_default_method(void)
sl@0: 	{
sl@0: 	if(!default_DH_method)
sl@0: 		default_DH_method = DH_OpenSSL();
sl@0: 	return default_DH_method;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int DH_set_method(DH *dh, const DH_METHOD *meth)
sl@0: 	{
sl@0: 	/* NB: The caller is specifically setting a method, so it's not up to us
sl@0: 	 * to deal with which ENGINE it comes from. */
sl@0:         const DH_METHOD *mtmp;
sl@0:         mtmp = dh->meth;
sl@0:         if (mtmp->finish) mtmp->finish(dh);
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 	if (dh->engine)
sl@0: 		{
sl@0: 		ENGINE_finish(dh->engine);
sl@0: 		dh->engine = NULL;
sl@0: 		}
sl@0: #endif
sl@0:         dh->meth = meth;
sl@0:         if (meth->init) meth->init(dh);
sl@0:         return 1;
sl@0: 	}
sl@0: 
sl@0: EXPORT_C DH *DH_new(void)
sl@0: 	{
sl@0: 	return DH_new_method(NULL);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C DH *DH_new_method(ENGINE *engine)
sl@0: 	{
sl@0: 	DH *ret;
sl@0: 
sl@0: 	ret=(DH *)OPENSSL_malloc(sizeof(DH));
sl@0: 	if (ret == NULL)
sl@0: 		{
sl@0: 		DHerr(DH_F_DH_NEW_METHOD,ERR_R_MALLOC_FAILURE);
sl@0: 		return(NULL);
sl@0: 		}
sl@0: 
sl@0: 	ret->meth = DH_get_default_method();
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 	if (engine)
sl@0: 		{
sl@0: 		if (!ENGINE_init(engine))
sl@0: 			{
sl@0: 			DHerr(DH_F_DH_NEW_METHOD, ERR_R_ENGINE_LIB);
sl@0: 			OPENSSL_free(ret);
sl@0: 			return NULL;
sl@0: 			}
sl@0: 		ret->engine = engine;
sl@0: 		}
sl@0: 	else
sl@0: 		ret->engine = ENGINE_get_default_DH();
sl@0: 	if(ret->engine)
sl@0: 		{
sl@0: 		ret->meth = ENGINE_get_DH(ret->engine);
sl@0: 		if(!ret->meth)
sl@0: 			{
sl@0: 			DHerr(DH_F_DH_NEW_METHOD,ERR_R_ENGINE_LIB);
sl@0: 			ENGINE_finish(ret->engine);
sl@0: 			OPENSSL_free(ret);
sl@0: 			return NULL;
sl@0: 			}
sl@0: 		}
sl@0: #endif
sl@0: 
sl@0: 	ret->pad=0;
sl@0: 	ret->version=0;
sl@0: 	ret->p=NULL;
sl@0: 	ret->g=NULL;
sl@0: 	ret->length=0;
sl@0: 	ret->pub_key=NULL;
sl@0: 	ret->priv_key=NULL;
sl@0: 	ret->q=NULL;
sl@0: 	ret->j=NULL;
sl@0: 	ret->seed = NULL;
sl@0: 	ret->seedlen = 0;
sl@0: 	ret->counter = NULL;
sl@0: 	ret->method_mont_p=NULL;
sl@0: 	ret->references = 1;
sl@0: 	ret->flags=ret->meth->flags;
sl@0: 	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
sl@0: 	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
sl@0: 		{
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 		if (ret->engine)
sl@0: 			ENGINE_finish(ret->engine);
sl@0: #endif
sl@0: 		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, ret, &ret->ex_data);
sl@0: 		OPENSSL_free(ret);
sl@0: 		ret=NULL;
sl@0: 		}
sl@0: 	return(ret);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void DH_free(DH *r)
sl@0: 	{
sl@0: 	int i;
sl@0: 	if(r == NULL) return;
sl@0: 	i = CRYPTO_add(&r->references, -1, CRYPTO_LOCK_DH);
sl@0: #ifdef REF_PRINT
sl@0: 	REF_PRINT("DH",r);
sl@0: #endif
sl@0: 	if (i > 0) return;
sl@0: #ifdef REF_CHECK
sl@0: 	if (i < 0)
sl@0: 		{
sl@0: 		fprintf(stderr,"DH_free, bad reference count\n");
sl@0: 		abort();
sl@0: 	}
sl@0: #endif
sl@0: 
sl@0: 	if (r->meth->finish)
sl@0: 		r->meth->finish(r);
sl@0: #ifndef OPENSSL_NO_ENGINE
sl@0: 	if (r->engine)
sl@0: 		ENGINE_finish(r->engine);
sl@0: #endif
sl@0: 
sl@0: 	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_DH, r, &r->ex_data);
sl@0: 
sl@0: 	if (r->p != NULL) BN_clear_free(r->p);
sl@0: 	if (r->g != NULL) BN_clear_free(r->g);
sl@0: 	if (r->q != NULL) BN_clear_free(r->q);
sl@0: 	if (r->j != NULL) BN_clear_free(r->j);
sl@0: 	if (r->seed) OPENSSL_free(r->seed);
sl@0: 	if (r->counter != NULL) BN_clear_free(r->counter);
sl@0: 	if (r->pub_key != NULL) BN_clear_free(r->pub_key);
sl@0: 	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
sl@0: 	OPENSSL_free(r);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int DH_up_ref(DH *r)
sl@0: 	{
sl@0: 	int i = CRYPTO_add(&r->references, 1, CRYPTO_LOCK_DH);
sl@0: #ifdef REF_PRINT
sl@0: 	REF_PRINT("DH",r);
sl@0: #endif
sl@0: #ifdef REF_CHECK
sl@0: 	if (i < 2)
sl@0: 		{
sl@0: 		fprintf(stderr, "DH_up, bad reference count\n");
sl@0: 		abort();
sl@0: 		}
sl@0: #endif
sl@0: 	return ((i > 1) ? 1 : 0);
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int DH_get_ex_new_index(long argl, void *argp, CRYPTO_EX_new *new_func,
sl@0: 	     CRYPTO_EX_dup *dup_func, CRYPTO_EX_free *free_func)
sl@0:         {
sl@0: 	return CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_DH, argl, argp,
sl@0: 				new_func, dup_func, free_func);
sl@0:         }
sl@0: 
sl@0: EXPORT_C int DH_set_ex_data(DH *d, int idx, void *arg)
sl@0: 	{
sl@0: 	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
sl@0: 	}
sl@0: 
sl@0: EXPORT_C void *DH_get_ex_data(DH *d, int idx)
sl@0: 	{
sl@0: 	return(CRYPTO_get_ex_data(&d->ex_data,idx));
sl@0: 	}
sl@0: 
sl@0: EXPORT_C int DH_size(const DH *dh)
sl@0: 	{
sl@0: 	return(BN_num_bytes(dh->p));
sl@0: 	}