crypto/ecdsa/ecs_lib.c - third_party/openssl - Git at Google

 /* crypto/ecdsa/ecs_lib.c */
 /* ====================================================================
  * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
  *
  * 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 above 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 acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  *
  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  *    endorse or promote products derived from this software without
  *    prior written permission. For written permission, please contact
  *    openssl-core@OpenSSL.org.
  *
  * 5. Products derived from this software may not be called "OpenSSL"
  *    nor may "OpenSSL" appear in their names without prior written
  *    permission of the OpenSSL Project.
  *
  * 6. Redistributions of any form whatsoever must retain the following
  *    acknowledgment:
  *    "This product includes software developed by the OpenSSL Project
  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  *
  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  * EXPRESSED 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 OpenSSL PROJECT OR
  * ITS 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.
  * ====================================================================
  *
  * This product includes cryptographic software written by Eric Young
  * (eay@cryptsoft.com).  This product includes software written by Tim
  * Hudson (tjh@cryptsoft.com).
  *
  */
 /* 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 "cryptlib.h"
 #include "ecdsa.h"
 #include <openssl/engine.h>

 const char *ECDSA_version="ECDSA" OPENSSL_VERSION_PTEXT;

 static const ECDSA_METHOD *default_ECDSA_method = NULL;

 void ECDSA_set_default_method(const ECDSA_METHOD *meth)
 {
 	default_ECDSA_method = meth;
 }

 const ECDSA_METHOD *ECDSA_get_default_method(void)
 {
 	if(!default_ECDSA_method)
 		default_ECDSA_method = ECDSA_OpenSSL();
 	return default_ECDSA_method;
 }

 ECDSA *ECDSA_new(void)
 {
 	return ECDSA_new_method(NULL);
 }

 int ECDSA_set_method(ECDSA *ecdsa, const ECDSA_METHOD *meth)
 {
         const ECDSA_METHOD *mtmp;
         mtmp = ecdsa->meth;
         if (mtmp->finish) mtmp->finish(ecdsa);
 	if (ecdsa->engine)
 	{
 		ENGINE_finish(ecdsa->engine);
 		ecdsa->engine = NULL;
 	}
         ecdsa->meth = meth;
         if (meth->init) meth->init(ecdsa);
         return 1;
 }

 ECDSA *ECDSA_new_method(ENGINE *engine)
 {
 	ECDSA *ret;

 	ret=(ECDSA *)OPENSSL_malloc(sizeof(ECDSA));
 	if (ret == NULL)
 	{
 		ECDSAerr(ECDSA_F_ECDSA_NEW,ERR_R_MALLOC_FAILURE);
 		return(NULL);
 	}

 	ret->meth = ECDSA_get_default_method();
 	ret->engine = engine;
 	if (!ret->engine)
 		ret->engine = ENGINE_get_default_ECDSA();
 	if (ret->engine)
 	{
 		ret->meth = ENGINE_get_ECDSA(ret->engine);
 		if (!ret->meth)
 		{
 			ECDSAerr(ECDSA_R_ECDSA_F_ECDSA_NEW, ERR_R_ENGINE_LIB);
 			ENGINE_finish(ret->engine);
 			OPENSSL_free(ret);
 			return NULL;
 		}
 	}

 	ret->version = 1;
 	ret->conversion_form = ECDSA_get_default_conversion_form();
 	ret->group = NULL;

 	ret->pub_key = NULL;
 	ret->priv_key = NULL;

 	ret->kinv = NULL;
 	ret->r = NULL;

 	ret->references = 1;
 	ret->flags = ret->meth->flags;
 	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
 	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
 	{
 		CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
 		OPENSSL_free(ret);
 		ret=NULL;
 	}

 	return(ret);
 }

 void ECDSA_free(ECDSA *r)
 {
 	int i;

 	if (r == NULL) return;

 	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_ECDSA);
 #ifdef REF_PRINT
 	REF_PRINT("ECDSA",r);
 #endif
 	if (i > 0) return;
 #ifdef REF_CHECK
 	if (i < 0)
 	{
 		fprintf(stderr,"ECDSA_free, bad reference count\n");
 		abort();
 	}
 #endif

 	if (r->meth->finish)
 		r->meth->finish(r);
 	if (r->engine)
 		ENGINE_finish(r->engine);

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

 	if (r->group    != NULL) EC_GROUP_free(r->group);
 	if (r->pub_key  != NULL) EC_POINT_free(r->pub_key);
 	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
 	if (r->kinv != NULL) BN_clear_free(r->kinv);
 	if (r->r    != NULL) BN_clear_free(r->r);
 	OPENSSL_free(r);
 }

 int ECDSA_size(const ECDSA *r)
 {
 	int ret,i;
 	ASN1_INTEGER bs;
 	BIGNUM	*order=NULL;
 	unsigned char buf[4];

 	if (r == NULL || r->group == NULL)
 		return 0;
 	if ((order = BN_new()) == NULL) return 0;
 	if (!EC_GROUP_get_order(r->group,order,NULL))
 	{
 		BN_clear_free(order);
 		return 0;
 	}
 	i=BN_num_bits(order);
 	bs.length=(i+7)/8;
 	bs.data=buf;
 	bs.type=V_ASN1_INTEGER;
 	/* If the top bit is set the asn1 encoding is 1 larger. */
 	buf[0]=0xff;

 	i=i2d_ASN1_INTEGER(&bs,NULL);
 	i+=i; /* r and s */
 	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
 	BN_clear_free(order);
 	return(ret);
 }

 int ECDSA_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_ECDSA, argl, argp,
 				new_func, dup_func, free_func);
 }

 int ECDSA_set_ex_data(ECDSA *d, int idx, void *arg)
 {
 	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
 }

 void *ECDSA_get_ex_data(ECDSA *d, int idx)
 {
 	return(CRYPTO_get_ex_data(&d->ex_data,idx));
 }

 int ECDSA_up_ref(ECDSA *ecdsa)
 {
 	int i = CRYPTO_add(&ecdsa->references, 1, CRYPTO_LOCK_ECDSA);
 #ifdef REF_PRINT
 	REF_PRINT("ECDSA",r);
 #endif
 #ifdef REF_CHECK
 	if (i < 2)
 	{
 	        fprintf(stderr, "ECDSA_up_ref, bad reference count\n");
                 abort();
         }
 #endif
         return ((i > 1) ? 1 : 0);
 }

 void	ECDSA_set_conversion_form(ECDSA *ecdsa, const point_conversion_form_t form)
 {
 	if (ecdsa) ecdsa->conversion_form = form;
 }

 point_conversion_form_t ECDSA_get_conversion_form(const ECDSA *ecdsa)
 {
 	return ecdsa ? ecdsa->conversion_form : 0;
 }

 static point_conversion_form_t default_conversion_form = POINT_CONVERSION_UNCOMPRESSED;

 void	ECDSA_set_default_conversion_form(const point_conversion_form_t form)
 {
 	default_conversion_form = form;
 }

 point_conversion_form_t ECDSA_get_default_conversion_form(void)
 {
 	return default_conversion_form;
 }
	/* crypto/ecdsa/ecs_lib.c */
	/* ====================================================================
	* Copyright (c) 1998-2002 The OpenSSL Project. All rights reserved.
	*
	* 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 above 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 acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
	*
	* 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
	* endorse or promote products derived from this software without
	* prior written permission. For written permission, please contact
	* openssl-core@OpenSSL.org.
	*
	* 5. Products derived from this software may not be called "OpenSSL"
	* nor may "OpenSSL" appear in their names without prior written
	* permission of the OpenSSL Project.
	*
	* 6. Redistributions of any form whatsoever must retain the following
	* acknowledgment:
	* "This product includes software developed by the OpenSSL Project
	* for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
	*
	* THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
	* EXPRESSED 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 OpenSSL PROJECT OR
	* ITS 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.
	* ====================================================================
	*
	* This product includes cryptographic software written by Eric Young
	* (eay@cryptsoft.com). This product includes software written by Tim
	* Hudson (tjh@cryptsoft.com).
	*
	*/
	/* 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 "cryptlib.h"
	#include "ecdsa.h"
	#include <openssl/engine.h>

	const char *ECDSA_version="ECDSA" OPENSSL_VERSION_PTEXT;

	static const ECDSA_METHOD *default_ECDSA_method = NULL;

	void ECDSA_set_default_method(const ECDSA_METHOD *meth)
	{
	default_ECDSA_method = meth;
	}

	const ECDSA_METHOD *ECDSA_get_default_method(void)
	{
	if(!default_ECDSA_method)
	default_ECDSA_method = ECDSA_OpenSSL();
	return default_ECDSA_method;
	}

	ECDSA *ECDSA_new(void)
	{
	return ECDSA_new_method(NULL);
	}

	int ECDSA_set_method(ECDSA ecdsa, const ECDSA_METHOD meth)
	{
	const ECDSA_METHOD *mtmp;
	mtmp = ecdsa->meth;
	if (mtmp->finish) mtmp->finish(ecdsa);
	if (ecdsa->engine)
	{
	ENGINE_finish(ecdsa->engine);
	ecdsa->engine = NULL;
	}
	ecdsa->meth = meth;
	if (meth->init) meth->init(ecdsa);
	return 1;
	}

	ECDSA ECDSA_new_method(ENGINE engine)
	{
	ECDSA *ret;

	ret=(ECDSA *)OPENSSL_malloc(sizeof(ECDSA));
	if (ret == NULL)
	{
	ECDSAerr(ECDSA_F_ECDSA_NEW,ERR_R_MALLOC_FAILURE);
	return(NULL);
	}

	ret->meth = ECDSA_get_default_method();
	ret->engine = engine;
	if (!ret->engine)
	ret->engine = ENGINE_get_default_ECDSA();
	if (ret->engine)
	{
	ret->meth = ENGINE_get_ECDSA(ret->engine);
	if (!ret->meth)
	{
	ECDSAerr(ECDSA_R_ECDSA_F_ECDSA_NEW, ERR_R_ENGINE_LIB);
	ENGINE_finish(ret->engine);
	OPENSSL_free(ret);
	return NULL;
	}
	}

	ret->version = 1;
	ret->conversion_form = ECDSA_get_default_conversion_form();
	ret->group = NULL;

	ret->pub_key = NULL;
	ret->priv_key = NULL;

	ret->kinv = NULL;
	ret->r = NULL;

	ret->references = 1;
	ret->flags = ret->meth->flags;
	CRYPTO_new_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
	if ((ret->meth->init != NULL) && !ret->meth->init(ret))
	{
	CRYPTO_free_ex_data(CRYPTO_EX_INDEX_ECDSA, ret, &ret->ex_data);
	OPENSSL_free(ret);
	ret=NULL;
	}

	return(ret);
	}

	void ECDSA_free(ECDSA *r)
	{
	int i;

	if (r == NULL) return;

	i=CRYPTO_add(&r->references,-1,CRYPTO_LOCK_ECDSA);
	#ifdef REF_PRINT
	REF_PRINT("ECDSA",r);
	#endif
	if (i > 0) return;
	#ifdef REF_CHECK
	if (i < 0)
	{
	fprintf(stderr,"ECDSA_free, bad reference count\n");
	abort();
	}
	#endif

	if (r->meth->finish)
	r->meth->finish(r);
	if (r->engine)
	ENGINE_finish(r->engine);

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

	if (r->group != NULL) EC_GROUP_free(r->group);
	if (r->pub_key != NULL) EC_POINT_free(r->pub_key);
	if (r->priv_key != NULL) BN_clear_free(r->priv_key);
	if (r->kinv != NULL) BN_clear_free(r->kinv);
	if (r->r != NULL) BN_clear_free(r->r);
	OPENSSL_free(r);
	}

	int ECDSA_size(const ECDSA *r)
	{
	int ret,i;
	ASN1_INTEGER bs;
	BIGNUM *order=NULL;
	unsigned char buf[4];

	if (r == NULL \|\| r->group == NULL)
	return 0;
	if ((order = BN_new()) == NULL) return 0;
	if (!EC_GROUP_get_order(r->group,order,NULL))
	{
	BN_clear_free(order);
	return 0;
	}
	i=BN_num_bits(order);
	bs.length=(i+7)/8;
	bs.data=buf;
	bs.type=V_ASN1_INTEGER;
	/* If the top bit is set the asn1 encoding is 1 larger. */
	buf[0]=0xff;

	i=i2d_ASN1_INTEGER(&bs,NULL);
	i+=i; /* r and s */
	ret=ASN1_object_size(1,i,V_ASN1_SEQUENCE);
	BN_clear_free(order);
	return(ret);
	}

	int ECDSA_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_ECDSA, argl, argp,
	new_func, dup_func, free_func);
	}

	int ECDSA_set_ex_data(ECDSA d, int idx, void arg)
	{
	return(CRYPTO_set_ex_data(&d->ex_data,idx,arg));
	}

	void ECDSA_get_ex_data(ECDSA d, int idx)
	{
	return(CRYPTO_get_ex_data(&d->ex_data,idx));
	}

	int ECDSA_up_ref(ECDSA *ecdsa)
	{
	int i = CRYPTO_add(&ecdsa->references, 1, CRYPTO_LOCK_ECDSA);
	#ifdef REF_PRINT
	REF_PRINT("ECDSA",r);
	#endif
	#ifdef REF_CHECK
	if (i < 2)
	{
	fprintf(stderr, "ECDSA_up_ref, bad reference count\n");
	abort();
	}
	#endif
	return ((i > 1) ? 1 : 0);
	}

	void ECDSA_set_conversion_form(ECDSA *ecdsa, const point_conversion_form_t form)
	{
	if (ecdsa) ecdsa->conversion_form = form;
	}

	point_conversion_form_t ECDSA_get_conversion_form(const ECDSA *ecdsa)
	{
	return ecdsa ? ecdsa->conversion_form : 0;
	}

	static point_conversion_form_t default_conversion_form = POINT_CONVERSION_UNCOMPRESSED;

	void ECDSA_set_default_conversion_form(const point_conversion_form_t form)
	{
	default_conversion_form = form;
	}

	point_conversion_form_t ECDSA_get_default_conversion_form(void)
	{
	return default_conversion_form;
	}