1 /* crypto/dsa/dsa_key.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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.
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).
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.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
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)"
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
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.]
59 #define OPENSSL_FIPSAPI
64 #ifndef OPENSSL_NO_SHA
65 #include <openssl/bn.h>
66 #include <openssl/dsa.h>
67 #include <openssl/rand.h>
71 #include <openssl/fips.h>
72 #include <openssl/evp.h>
74 static int fips_dsa_pairwise_fail
= 0;
76 void FIPS_corrupt_dsa_keygen(void)
78 fips_dsa_pairwise_fail
= 1;
81 static int fips_check_dsa(DSA
*dsa
)
84 unsigned char tbs
[] = "DSA Pairwise Check Data";
85 pk
.type
= EVP_PKEY_DSA
;
88 if (!fips_pkey_signature_test(FIPS_TEST_PAIRWISE
,
89 &pk
, tbs
, -1, NULL
, 0, NULL
, 0, NULL
))
91 FIPSerr(FIPS_F_FIPS_CHECK_DSA
,FIPS_R_PAIRWISE_TEST_FAILED
);
92 fips_set_selftest_fail();
100 static int dsa_builtin_keygen(DSA
*dsa
);
102 int DSA_generate_key(DSA
*dsa
)
104 if(dsa
->meth
->dsa_keygen
)
105 return dsa
->meth
->dsa_keygen(dsa
);
106 return dsa_builtin_keygen(dsa
);
109 static int dsa_builtin_keygen(DSA
*dsa
)
113 BIGNUM
*pub_key
=NULL
,*priv_key
=NULL
;
116 if (FIPS_mode() && (BN_num_bits(dsa
->p
) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS
))
118 DSAerr(DSA_F_DSA_BUILTIN_KEYGEN
, DSA_R_KEY_SIZE_TOO_SMALL
);
123 if ((ctx
=BN_CTX_new()) == NULL
) goto err
;
125 if (dsa
->priv_key
== NULL
)
127 if ((priv_key
=BN_new()) == NULL
) goto err
;
130 priv_key
=dsa
->priv_key
;
133 if (!BN_rand_range(priv_key
,dsa
->q
)) goto err
;
134 while (BN_is_zero(priv_key
));
136 if (dsa
->pub_key
== NULL
)
138 if ((pub_key
=BN_new()) == NULL
) goto err
;
141 pub_key
=dsa
->pub_key
;
147 if ((dsa
->flags
& DSA_FLAG_NO_EXP_CONSTTIME
) == 0)
151 BN_with_flags(prk
, priv_key
, BN_FLG_CONSTTIME
);
156 if (!BN_mod_exp(pub_key
,dsa
->g
,prk
,dsa
->p
,ctx
)) goto err
;
159 dsa
->priv_key
=priv_key
;
160 dsa
->pub_key
=pub_key
;
162 if (fips_dsa_pairwise_fail
)
163 BN_add_word(dsa
->pub_key
, 1);
164 if(!fips_check_dsa(dsa
))
167 dsa
->priv_key
= NULL
;
174 if ((pub_key
!= NULL
) && (dsa
->pub_key
== NULL
)) BN_free(pub_key
);
175 if ((priv_key
!= NULL
) && (dsa
->priv_key
== NULL
)) BN_free(priv_key
);
176 if (ctx
!= NULL
) BN_CTX_free(ctx
);