Head

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 %


/* $OpenBSD: dsa_key.c,v 1.23 2017/01/21 09:38:59 beck Exp $ */
/* 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 <stdio.h>
#include <time.h>

#include <openssl/opensslconf.h>

#ifndef OPENSSL_NO_SHA

#include <openssl/bn.h>
#include <openssl/dsa.h>
#include "bn_lcl.h"

static int dsa_builtin_keygen(DSA *dsa);

int
DSA_generate_key(DSA *dsa)
{
	if (dsa->meth->dsa_keygen)
		return dsa->meth->dsa_keygen(dsa);
	return dsa_builtin_keygen(dsa);
}

static int
dsa_builtin_keygen(DSA *dsa)
{
	int ok = 0;
	BN_CTX *ctx = NULL;
	BIGNUM *pub_key = NULL, *priv_key = NULL;

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

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

	do {
		if (!BN_rand_range(priv_key, dsa->q))
			goto err;
	} while (BN_is_zero(priv_key));

	if (dsa->pub_key == NULL) {
		if ((pub_key = BN_new()) == NULL)
			goto err;
	} else
		pub_key=dsa->pub_key;

	{
		BIGNUM prk;

		BN_with_flags(&prk, priv_key, BN_FLG_CONSTTIME);

		if (!BN_mod_exp_ct(pub_key, dsa->g, &prk, dsa->p, ctx))
			goto err;
	}

	dsa->priv_key = priv_key;
	dsa->pub_key = pub_key;
	ok = 1;

err:
	if (pub_key != NULL && dsa->pub_key == NULL)
		BN_free(pub_key);
	if (priv_key != NULL && dsa->priv_key == NULL)
		BN_free(priv_key);
	BN_CTX_free(ctx);
	return ok;
}
#endif


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: dsa_key.c,v 1.23 2017/01/21 09:38:59 beck Exp $ */
2			/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
3			* All rights reserved.
4			*
5			* This package is an SSL implementation written
6			* by Eric Young (eay@cryptsoft.com).
7			* The implementation was written so as to conform with Netscapes SSL.
8			*
9			* This library is free for commercial and non-commercial use as long as
10			* the following conditions are aheared to. The following conditions
11			* apply to all code found in this distribution, be it the RC4, RSA,
12			* lhash, DES, etc., code; not just the SSL code. The SSL documentation
13			* included with this distribution is covered by the same copyright terms
14			* except that the holder is Tim Hudson (tjh@cryptsoft.com).
15			*
16			* Copyright remains Eric Young's, and as such any Copyright notices in
17			* the code are not to be removed.
18			* If this package is used in a product, Eric Young should be given attribution
19			* as the author of the parts of the library used.
20			* This can be in the form of a textual message at program startup or
21			* in documentation (online or textual) provided with the package.
22			*
23			* Redistribution and use in source and binary forms, with or without
24			* modification, are permitted provided that the following conditions
25			* are met:
26			* 1. Redistributions of source code must retain the copyright
27			* notice, this list of conditions and the following disclaimer.
28			* 2. Redistributions in binary form must reproduce the above copyright
29			* notice, this list of conditions and the following disclaimer in the
30			* documentation and/or other materials provided with the distribution.
31			* 3. All advertising materials mentioning features or use of this software
32			* must display the following acknowledgement:
33			* "This product includes cryptographic software written by
34			* Eric Young (eay@cryptsoft.com)"
35			* The word 'cryptographic' can be left out if the rouines from the library
36			* being used are not cryptographic related :-).
37			* 4. If you include any Windows specific code (or a derivative thereof) from
38			* the apps directory (application code) you must include an acknowledgement:
39			* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
40			*
41			* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42			* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43			* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44			* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45			* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46			* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47			* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48			* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49			* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50			* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
51			* SUCH DAMAGE.
52			*
53			* The licence and distribution terms for any publically available version or
54			* derivative of this code cannot be changed. i.e. this code cannot simply be
55			* copied and put under another distribution licence
56			* [including the GNU Public Licence.]
57			*/
58
59			#include <stdio.h>
60			#include <time.h>
61
62			#include <openssl/opensslconf.h>
63
64			#ifndef OPENSSL_NO_SHA
65
66			#include <openssl/bn.h>
67			#include <openssl/dsa.h>
68			#include "bn_lcl.h"
69
70			static int dsa_builtin_keygen(DSA *dsa);
71
72			int
73			DSA_generate_key(DSA *dsa)
74			{
75	✗✓	28	if (dsa->meth->dsa_keygen)
76			return dsa->meth->dsa_keygen(dsa);
77		14	return dsa_builtin_keygen(dsa);
78		14	}
79
80			static int
81			dsa_builtin_keygen(DSA *dsa)
82			{
83			int ok = 0;
84			BN_CTX *ctx = NULL;
85			BIGNUM pub_key = NULL, priv_key = NULL;
86
87	✓✗	28	if ((ctx = BN_CTX_new()) == NULL)
88			goto err;
89
90	✓✗	14	if (dsa->priv_key == NULL) {
91	✓✗	14	if ((priv_key = BN_new()) == NULL)
92			goto err;
93			} else
94			priv_key=dsa->priv_key;
95
96		14	do {
97	✓✗	14	if (!BN_rand_range(priv_key, dsa->q))
98			goto err;
99	✗✓	14	} while (BN_is_zero(priv_key));
100
101	✓✗	14	if (dsa->pub_key == NULL) {
102	✓✗	14	if ((pub_key = BN_new()) == NULL)
103			goto err;
104			} else
105			pub_key=dsa->pub_key;
106
107			{
108		14	BIGNUM prk;
109
110		14	BN_with_flags(&prk, priv_key, BN_FLG_CONSTTIME);
111
112	✗✓	14	if (!BN_mod_exp_ct(pub_key, dsa->g, &prk, dsa->p, ctx))
113			goto err;
114	✓✓✓	56	}
115
116		14	dsa->priv_key = priv_key;
117		14	dsa->pub_key = pub_key;
118		14	ok = 1;
119
120			err:
121	✓✗✗✓	28	if (pub_key != NULL && dsa->pub_key == NULL)
122			BN_free(pub_key);
123	✓✗✗✓	28	if (priv_key != NULL && dsa->priv_key == NULL)
124			BN_free(priv_key);
125		14	BN_CTX_free(ctx);
126		14	return ok;
127		14	}
128			#endif