fips_dsa_key.c revision 193645 
1/* crypto/dsa/dsa_key.c */
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#ifndef OPENSSL_NO_SHA
62#include <openssl/bn.h>
63#include <openssl/dsa.h>
64#include <openssl/rand.h>
65#include <openssl/err.h>
66#include <openssl/evp.h>
67#include <openssl/fips.h>
68#include "fips_locl.h"
69
70#ifdef OPENSSL_FIPS
71
72static int fips_dsa_pairwise_fail = 0;
73
74void FIPS_corrupt_dsa_keygen(void)
75	{
76	fips_dsa_pairwise_fail = 1;
77	}
78
79static int dsa_builtin_keygen(DSA *dsa);
80
81int fips_check_dsa(DSA *dsa)
82	{
83	EVP_PKEY pk;
84	unsigned char tbs[] = "DSA Pairwise Check Data";
85    	pk.type = EVP_PKEY_DSA;
86    	pk.pkey.dsa = dsa;
87
88	if (!fips_pkey_signature_test(&pk, tbs, -1,
89					NULL, 0, EVP_dss1(), 0, NULL))
90		{
91		FIPSerr(FIPS_F_FIPS_CHECK_DSA,FIPS_R_PAIRWISE_TEST_FAILED);
92		fips_set_selftest_fail();
93		return 0;
94		}
95	return 1;
96	}
97
98int DSA_generate_key(DSA *dsa)
99	{
100	if(dsa->meth->dsa_keygen)
101		return dsa->meth->dsa_keygen(dsa);
102	return dsa_builtin_keygen(dsa);
103	}
104
105static int dsa_builtin_keygen(DSA *dsa)
106	{
107	int ok=0;
108	BN_CTX *ctx=NULL;
109	BIGNUM *pub_key=NULL,*priv_key=NULL;
110
111	if (FIPS_mode() && (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS))
112		{
113		DSAerr(DSA_F_DSA_BUILTIN_KEYGEN, DSA_R_KEY_SIZE_TOO_SMALL);
114		goto err;
115		}
116
117	if ((ctx=BN_CTX_new()) == NULL) goto err;
118
119	if (dsa->priv_key == NULL)
120		{
121		if ((priv_key=BN_new()) == NULL) goto err;
122		}
123	else
124		priv_key=dsa->priv_key;
125
126	do
127		if (!BN_rand_range(priv_key,dsa->q)) goto err;
128	while (BN_is_zero(priv_key));
129
130	if (dsa->pub_key == NULL)
131		{
132		if ((pub_key=BN_new()) == NULL) goto err;
133		}
134	else
135		pub_key=dsa->pub_key;
136
137	{
138		BIGNUM local_prk;
139		BIGNUM *prk;
140
141		if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
142			{
143			BN_init(&local_prk);
144			prk = &local_prk;
145			BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
146			}
147		else
148			prk = priv_key;
149
150		if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err;
151	}
152
153	dsa->priv_key=priv_key;
154	dsa->pub_key=pub_key;
155	if (fips_dsa_pairwise_fail)
156		BN_add_word(dsa->pub_key, 1);
157	if(!fips_check_dsa(dsa))
158	    goto err;
159	ok=1;
160
161err:
162	if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key);
163	if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key);
164	if (ctx != NULL) BN_CTX_free(ctx);
165	return(ok);
166	}
167#endif
168
169#endif
170