/* crypto/ec/ec_key.c */
/*
 * Written by Nils Larsch for the OpenSSL project.
 */
/* ====================================================================
 * Copyright (c) 1998-2005 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 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 * Portions originally developed by SUN MICROSYSTEMS, INC., and 
 * contributed to the OpenSSL project.
 */

#include <string.h>
#include "sec_alloc.h"
#include "ec/ec_lcl.h"
#include "log.h"

EC_KEY *EC_KEY_new(void)
{
	EC_KEY *ret;

	ret=(EC_KEY *)sec_malloc(sizeof(EC_KEY));
	if (ret == NULL) {
		 /* Cerr(EC_F_EC_KEY_NEW, ERR_R_MALLOC_FAILURE); */
		return(NULL);
	}

	ret->version = 1;	
	ret->flags = 0;
	ret->group   = NULL;
	ret->pub_key = NULL;
	ret->priv_key= NULL;
	ret->enc_flag= 0; 
	ret->conv_form = POINT_CONVERSION_UNCOMPRESSED;
	ret->references= 1;
	ret->method_data = NULL;
	return(ret);
}

EC_KEY *EC_KEY_new_by_curve_name(int nid)
{
	EC_KEY *ret = EC_KEY_new();
	if (ret == NULL)
		return NULL;
	ret->group = EC_GROUP_new_by_curve_name(nid);
	if (ret->group == NULL) {
		EC_KEY_free(ret);
		return NULL;
	}
	return ret;
}

void EC_KEY_free(EC_KEY *r)
{
	//int i;

	if (r == NULL) return;

	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);

	EC_EX_DATA_free_all_data(&r->method_data);

	sec_cleanse((void *)r, sizeof(EC_KEY));

	sec_free(r);
}

int EC_KEY_generate_key(EC_KEY *eckey)
{	
	int ok = 0;
	BN_CTX *ctx = NULL;
	BIGNUM *priv_key = NULL, *order = NULL;
	EC_POINT *pub_key = NULL;

	if (!eckey || !eckey->group) {
		 /* ECerr(EC_F_EC_KEY_GENERATE_KEY, ERR_R_PASSED_NULL_PARAMETER); */
		return 0;
	}

	if ((order = BN_new()) == NULL) goto err;
	if ((ctx = BN_CTX_new()) == NULL) goto err;

	if (eckey->priv_key == NULL) {
		priv_key = BN_new();
		if (priv_key == NULL)
			goto err;
	} else
		priv_key = eckey->priv_key;

	if (!EC_GROUP_get_order(eckey->group, order, ctx))
		goto err;

	do
		if (!BN_rand_range(priv_key, order))
			goto err;
	while (BN_is_zero(priv_key));

	if (eckey->pub_key == NULL) {
		pub_key = EC_POINT_new(eckey->group);
		if (pub_key == NULL)
			goto err;
	} else
		pub_key = eckey->pub_key;

	if (!EC_POINT_mul(eckey->group, pub_key, priv_key, NULL, NULL, ctx))
		goto err;

	eckey->priv_key = priv_key;
	eckey->pub_key  = pub_key;

	ok=1;

err:	
	if (order)
		BN_free(order);
	if (pub_key  != NULL && eckey->pub_key  == NULL)
		EC_POINT_free(pub_key);
	if (priv_key != NULL && eckey->priv_key == NULL)
		BN_free(priv_key);
	if (ctx != NULL)
		BN_CTX_free(ctx);
	return(ok);
}

int EC_KEY_check_key(const EC_KEY *eckey)
{
	int ok = 0;
	BN_CTX *ctx = NULL;
	const BIGNUM *order  = NULL;
	EC_POINT *point = NULL;

	if (!eckey || !eckey->group || !eckey->pub_key) {
		//ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_PASSED_NULL_PARAMETER);
		LOGD("EC_KEY_check_key: some NULL");
		return 0;
	}

	if (EC_POINT_is_at_infinity(eckey->group, eckey->pub_key)) {
		//ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_AT_INFINITY);
		LOGD("EC_KEY_check_key: EC_R_POINT_AT_INFINITY");
		goto err;
	}

	if ((ctx = BN_CTX_new()) == NULL)
		goto err;
	if ((point = EC_POINT_new(eckey->group)) == NULL)
		goto err;

	/* testing whether the pub_key is on the elliptic curve */
	if (!EC_POINT_is_on_curve(eckey->group, eckey->pub_key, ctx)) {
		//ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_POINT_IS_NOT_ON_CURVE);
		LOGD("EC_KEY_check_key: EC_R_POINT_IS_NOT_ON_CURVE");
		goto err;
	}
	/* testing whether pub_key * order is the point at infinity */
	order = &eckey->group->order;
	if (BN_is_zero(order)) {
		//ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_GROUP_ORDER);
		LOGD("EC_KEY_check_key: EC_R_INVALID_GROUP_ORDER");
		goto err;
	}
	if (!EC_POINT_mul(eckey->group, point, NULL, eckey->pub_key, order, ctx)) {
		//ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
		LOGD("EC_KEY_check_key: ERR_R_EC_LIB");
		goto err;
	}
	if (!EC_POINT_is_at_infinity(eckey->group, point)) {
		//ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
		LOGD("EC_KEY_check_key: EC_R_WRONG_ORDER");
		goto err;
	}
	/* in case the priv_key is present : 
	 * check if generator * priv_key == pub_key 
	 */
	if (eckey->priv_key) {
		if (BN_cmp(eckey->priv_key, order) >= 0) {
			//ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_WRONG_ORDER);
			LOGD("EC_KEY_check_key: priv_key EC_R_WRONG_ORDER");
			goto err;
		}
		if (!EC_POINT_mul(eckey->group, point, eckey->priv_key, NULL, NULL, ctx))
		{
			//ECerr(EC_F_EC_KEY_CHECK_KEY, ERR_R_EC_LIB);
			LOGD("EC_KEY_check_key: ERR_R_EC_LIB");
			goto err;
		}
		if (EC_POINT_cmp(eckey->group, point, eckey->pub_key, ctx) != 0) {
			//ECerr(EC_F_EC_KEY_CHECK_KEY, EC_R_INVALID_PRIVATE_KEY);
			LOGD("EC_KEY_check_key: EC_R_INVALID_PRIVATE_KEY");
			goto err;
		}
	}
	ok = 1;
err:
	if (ctx   != NULL)
		BN_CTX_free(ctx);
	if (point != NULL)
		EC_POINT_free(point);
	return(ok);
}