GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/ecdsa/ecs_vrf.c Lines: 17 19 89.5 %
Date: 2017-11-13 Branches: 6 10 60.0 %

Line Branch Exec Source
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/* $OpenBSD: ecs_vrf.c,v 1.6 2017/05/02 03:59:44 deraadt Exp $ */
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/*
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 * Written by Nils Larsch for the OpenSSL project
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 */
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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 <string.h>
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#include <openssl/opensslconf.h>
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#include "ecs_locl.h"
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#ifndef OPENSSL_NO_ENGINE
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#include <openssl/engine.h>
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#endif
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/* returns
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 *      1: correct signature
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 *      0: incorrect signature
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 *     -1: error
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 */
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int
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ECDSA_do_verify(const unsigned char *dgst, int dgst_len, const ECDSA_SIG *sig,
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    EC_KEY *eckey)
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{
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2280
	ECDSA_DATA *ecdsa = ecdsa_check(eckey);
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1140
	if (ecdsa == NULL)
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		return 0;
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1140
	return ecdsa->meth->ecdsa_do_verify(dgst, dgst_len, sig, eckey);
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1140
}
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/* returns
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 *      1: correct signature
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 *      0: incorrect signature
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 *     -1: error
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 */
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int
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ECDSA_verify(int type, const unsigned char *dgst, int dgst_len,
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    const unsigned char *sigbuf, int sig_len, EC_KEY *eckey)
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{
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2736
	ECDSA_SIG *s;
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1368
	unsigned char *der = NULL;
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1368
	const unsigned char *p = sigbuf;
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	int derlen = -1;
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	int ret = -1;
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1368
	s = ECDSA_SIG_new();
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1368
	if (s == NULL)
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		return (ret);
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1368
	if (d2i_ECDSA_SIG(&s, &p, sig_len) == NULL)
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		goto err;
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	/* Ensure signature uses DER and doesn't have trailing garbage */
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1140
	derlen = i2d_ECDSA_SIG(s, &der);
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2280
	if (derlen != sig_len || memcmp(sigbuf, der, derlen))
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		goto err;
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1140
	ret = ECDSA_do_verify(dgst, dgst_len, s, eckey);
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err:
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1368
	freezero(der, derlen);
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1368
	ECDSA_SIG_free(s);
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1368
	return (ret);
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1368
}