GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: lib/libcrypto/dsa/dsa_key.c Lines: 23 27 85.2 %
Date: 2017-11-13 Branches: 16 29 55.2 %

Line Branch Exec Source
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/* $OpenBSD: dsa_key.c,v 1.23 2017/01/21 09:38:59 beck Exp $ */
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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 * All rights reserved.
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 *
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 * This package is an SSL implementation written
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 * by Eric Young (eay@cryptsoft.com).
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 * The implementation was written so as to conform with Netscapes SSL.
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 *
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 * This library is free for commercial and non-commercial use as long as
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 * the following conditions are aheared to.  The following conditions
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 * apply to all code found in this distribution, be it the RC4, RSA,
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 * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
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 * included with this distribution is covered by the same copyright terms
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 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
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 *
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 * Copyright remains Eric Young's, and as such any Copyright notices in
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 * the code are not to be removed.
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 * If this package is used in a product, Eric Young should be given attribution
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 * as the author of the parts of the library used.
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 * This can be in the form of a textual message at program startup or
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 * in documentation (online or textual) provided with the package.
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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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 * 1. Redistributions of source code must retain the copyright
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 *    notice, this list of conditions and the following disclaimer.
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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 the
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 *    documentation and/or other materials provided with the distribution.
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 * 3. All advertising materials mentioning features or use of this software
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 *    must display the following acknowledgement:
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 *    "This product includes cryptographic software written by
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 *     Eric Young (eay@cryptsoft.com)"
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 *    The word 'cryptographic' can be left out if the rouines from the library
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 *    being used are not cryptographic related :-).
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 * 4. If you include any Windows specific code (or a derivative thereof) from
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 *    the apps directory (application code) you must include an acknowledgement:
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 *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
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 *
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 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
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 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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 * SUCH DAMAGE.
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 *
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 * The licence and distribution terms for any publically available version or
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 * derivative of this code cannot be changed.  i.e. this code cannot simply be
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 * copied and put under another distribution licence
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 * [including the GNU Public Licence.]
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 */
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#include <stdio.h>
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#include <time.h>
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#include <openssl/opensslconf.h>
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#ifndef OPENSSL_NO_SHA
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#include <openssl/bn.h>
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#include <openssl/dsa.h>
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#include "bn_lcl.h"
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static int dsa_builtin_keygen(DSA *dsa);
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int
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DSA_generate_key(DSA *dsa)
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{
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	if (dsa->meth->dsa_keygen)
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		return dsa->meth->dsa_keygen(dsa);
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	return dsa_builtin_keygen(dsa);
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}
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static int
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dsa_builtin_keygen(DSA *dsa)
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{
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	int ok = 0;
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	BN_CTX *ctx = NULL;
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	BIGNUM *pub_key = NULL, *priv_key = NULL;
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	if ((ctx = BN_CTX_new()) == NULL)
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		goto err;
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	if (dsa->priv_key == NULL) {
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		if ((priv_key = BN_new()) == NULL)
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			goto err;
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	} else
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		priv_key=dsa->priv_key;
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	do {
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		if (!BN_rand_range(priv_key, dsa->q))
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			goto err;
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	} while (BN_is_zero(priv_key));
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	if (dsa->pub_key == NULL) {
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		if ((pub_key = BN_new()) == NULL)
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			goto err;
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	} else
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		pub_key=dsa->pub_key;
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	{
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		BIGNUM prk;
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		BN_with_flags(&prk, priv_key, BN_FLG_CONSTTIME);
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		if (!BN_mod_exp_ct(pub_key, dsa->g, &prk, dsa->p, ctx))
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			goto err;
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	}
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	dsa->priv_key = priv_key;
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	dsa->pub_key = pub_key;
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	ok = 1;
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err:
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	if (pub_key != NULL && dsa->pub_key == NULL)
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		BN_free(pub_key);
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	if (priv_key != NULL && dsa->priv_key == NULL)
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		BN_free(priv_key);
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	BN_CTX_free(ctx);
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	return ok;
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}
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#endif