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_check_dsa(DSA *dsa)
77 unsigned char tbs[] = "DSA Pairwise Check Data";
78 pk.type = EVP_PKEY_DSA;
81 if (!fips_pkey_signature_test(FIPS_TEST_PAIRWISE,
82 &pk, tbs, 0, NULL, 0, NULL, 0, NULL))
84 FIPSerr(FIPS_F_FIPS_CHECK_DSA,FIPS_R_PAIRWISE_TEST_FAILED);
85 fips_set_selftest_fail();
93 static int dsa_builtin_keygen(DSA *dsa);
95 int DSA_generate_key(DSA *dsa)
97 if(dsa->meth->dsa_keygen)
98 return dsa->meth->dsa_keygen(dsa);
99 return dsa_builtin_keygen(dsa);
102 static int dsa_builtin_keygen(DSA *dsa)
106 BIGNUM *pub_key=NULL,*priv_key=NULL;
109 if (FIPS_module_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW)
110 && (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS))
112 DSAerr(DSA_F_DSA_BUILTIN_KEYGEN, DSA_R_KEY_SIZE_TOO_SMALL);
115 if (!fips_check_dsa_prng(dsa, 0, 0))
119 if ((ctx=BN_CTX_new()) == NULL) goto err;
121 if (dsa->priv_key == NULL)
123 if ((priv_key=BN_new()) == NULL) goto err;
126 priv_key=dsa->priv_key;
129 if (!BN_rand_range(priv_key,dsa->q)) goto err;
130 while (BN_is_zero(priv_key));
132 if (dsa->pub_key == NULL)
134 if ((pub_key=BN_new()) == NULL) goto err;
137 pub_key=dsa->pub_key;
143 if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
147 BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
152 if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err;
155 dsa->priv_key=priv_key;
156 dsa->pub_key=pub_key;
158 if(!fips_check_dsa(dsa))
161 dsa->priv_key = NULL;
168 if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key);
169 if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key);
170 if (ctx != NULL) BN_CTX_free(ctx);