GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/crypto/../../libssl/src/crypto/ec/ec_check.c Lines: 24 40 60.0 %
Date: 2016-12-06 Branches: 12 24 50.0 %

Line Branch Exec Source
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/* $OpenBSD: ec_check.c,v 1.5 2015/02/08 22:25:03 miod Exp $ */
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/* ====================================================================
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 * Copyright (c) 1998-2002 The OpenSSL Project.  All rights reserved.
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 *
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 * Redistribution and use in source and binary forms, with or without
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 * modification, are permitted provided that the following conditions
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 * are met:
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 *
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 * 1. Redistributions of source code must retain the above copyright
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 *    notice, this list of conditions and the following disclaimer.
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 *
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 * 2. Redistributions in binary form must reproduce the above copyright
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 *    notice, this list of conditions and the following disclaimer in
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 *    the documentation and/or other materials provided with the
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 *    distribution.
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 *
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 * 3. All advertising materials mentioning features or use of this
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 *    software must display the following acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
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 *
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 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
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 *    endorse or promote products derived from this software without
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 *    prior written permission. For written permission, please contact
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 *    openssl-core@openssl.org.
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 *
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 * 5. Products derived from this software may not be called "OpenSSL"
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 *    nor may "OpenSSL" appear in their names without prior written
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 *    permission of the OpenSSL Project.
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 *
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 * 6. Redistributions of any form whatsoever must retain the following
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 *    acknowledgment:
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 *    "This product includes software developed by the OpenSSL Project
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 *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
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 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
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 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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 * OF THE POSSIBILITY OF SUCH DAMAGE.
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 * ====================================================================
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 *
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 * This product includes cryptographic software written by Eric Young
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 * (eay@cryptsoft.com).  This product includes software written by Tim
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 * Hudson (tjh@cryptsoft.com).
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 *
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 */
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#include "ec_lcl.h"
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#include <openssl/err.h>
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int
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EC_GROUP_check(const EC_GROUP * group, BN_CTX * ctx)
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90
{
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	int ret = 0;
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	BIGNUM *order;
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	BN_CTX *new_ctx = NULL;
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	EC_POINT *point = NULL;
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	if (ctx == NULL) {
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		ctx = new_ctx = BN_CTX_new();
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		if (ctx == NULL) {
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			ECerr(EC_F_EC_GROUP_CHECK, ERR_R_MALLOC_FAILURE);
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			goto err;
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		}
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	}
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	BN_CTX_start(ctx);
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	if ((order = BN_CTX_get(ctx)) == NULL)
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		goto err;
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	/* check the discriminant */
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	if (!EC_GROUP_check_discriminant(group, ctx)) {
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		ECerr(EC_F_EC_GROUP_CHECK, EC_R_DISCRIMINANT_IS_ZERO);
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		goto err;
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	}
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	/* check the generator */
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	if (group->generator == NULL) {
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		ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_GENERATOR);
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		goto err;
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	}
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	if (EC_POINT_is_on_curve(group, group->generator, ctx) <= 0) {
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		ECerr(EC_F_EC_GROUP_CHECK, EC_R_POINT_IS_NOT_ON_CURVE);
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		goto err;
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	}
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	/* check the order of the generator */
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	if ((point = EC_POINT_new(group)) == NULL)
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		goto err;
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	if (!EC_GROUP_get_order(group, order, ctx))
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		goto err;
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	if (BN_is_zero(order)) {
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		ECerr(EC_F_EC_GROUP_CHECK, EC_R_UNDEFINED_ORDER);
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		goto err;
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	}
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	if (!EC_POINT_mul(group, point, order, NULL, NULL, ctx))
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		goto err;
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	if (EC_POINT_is_at_infinity(group, point) <= 0) {
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		ECerr(EC_F_EC_GROUP_CHECK, EC_R_INVALID_GROUP_ORDER);
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		goto err;
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	}
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	ret = 1;
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err:
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	if (ctx != NULL)
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		BN_CTX_end(ctx);
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	BN_CTX_free(new_ctx);
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	EC_POINT_free(point);
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	return ret;
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}