1998-12-21 18:52:47 +08:00
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/* crypto/dsa/dsa_key.c */
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1998-12-21 18:56:39 +08:00
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
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1998-12-21 18:52:47 +08:00
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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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2011-02-04 01:00:24 +08:00
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#define OPENSSL_FIPSAPI
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1998-12-21 18:52:47 +08:00
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#include <stdio.h>
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#include <time.h>
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#include "cryptlib.h"
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2003-03-21 07:21:51 +08:00
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#ifndef OPENSSL_NO_SHA
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1999-04-24 06:13:45 +08:00
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#include <openssl/bn.h>
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#include <openssl/dsa.h>
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#include <openssl/rand.h>
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1998-12-21 18:52:47 +08:00
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2011-01-26 23:46:26 +08:00
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#ifdef OPENSSL_FIPS
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#include <openssl/fips.h>
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#include <openssl/evp.h>
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static int fips_check_dsa(DSA *dsa)
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{
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EVP_PKEY pk;
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unsigned char tbs[] = "DSA Pairwise Check Data";
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pk.type = EVP_PKEY_DSA;
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pk.pkey.dsa = dsa;
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2011-04-14 19:15:10 +08:00
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if (!fips_pkey_signature_test(FIPS_TEST_PAIRWISE,
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2011-04-19 19:10:54 +08:00
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&pk, tbs, 0, NULL, 0, NULL, 0, NULL))
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2011-01-26 23:46:26 +08:00
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{
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FIPSerr(FIPS_F_FIPS_CHECK_DSA,FIPS_R_PAIRWISE_TEST_FAILED);
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fips_set_selftest_fail();
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return 0;
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}
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return 1;
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}
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#endif
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2003-01-15 10:01:55 +08:00
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static int dsa_builtin_keygen(DSA *dsa);
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1999-04-20 05:31:43 +08:00
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int DSA_generate_key(DSA *dsa)
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2003-01-15 10:01:55 +08:00
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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 dsa_builtin_keygen(DSA *dsa)
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1998-12-21 18:52:47 +08:00
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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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2011-01-26 23:46:26 +08:00
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#ifdef OPENSSL_FIPS
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2011-05-11 22:43:38 +08:00
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if (FIPS_module_mode() && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW)
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2011-04-24 03:55:55 +08:00
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&& (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS))
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2011-01-26 23:46:26 +08:00
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{
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DSAerr(DSA_F_DSA_BUILTIN_KEYGEN, DSA_R_KEY_SIZE_TOO_SMALL);
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goto err;
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}
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2011-04-24 03:55:55 +08:00
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if (!fips_check_dsa_prng(dsa, 0, 0))
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goto err;
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2011-01-26 23:46:26 +08:00
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#endif
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1998-12-21 18:52:47 +08:00
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if ((ctx=BN_CTX_new()) == NULL) goto err;
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if (dsa->priv_key == NULL)
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{
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if ((priv_key=BN_new()) == NULL) goto err;
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}
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else
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priv_key=dsa->priv_key;
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2001-02-20 08:43:59 +08:00
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do
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if (!BN_rand_range(priv_key,dsa->q)) goto err;
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while (BN_is_zero(priv_key));
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1998-12-21 18:52:47 +08:00
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if (dsa->pub_key == NULL)
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{
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if ((pub_key=BN_new()) == NULL) goto err;
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}
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else
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pub_key=dsa->pub_key;
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2005-05-16 09:43:31 +08:00
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{
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BIGNUM local_prk;
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BIGNUM *prk;
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if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0)
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{
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2005-05-27 23:38:53 +08:00
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BN_init(&local_prk);
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2005-05-16 09:43:31 +08:00
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prk = &local_prk;
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2007-03-28 08:15:28 +08:00
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BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
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2005-05-16 09:43:31 +08:00
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}
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else
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prk = priv_key;
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1998-12-21 18:52:47 +08:00
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2005-05-16 09:43:31 +08:00
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if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err;
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}
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1998-12-21 18:52:47 +08:00
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dsa->priv_key=priv_key;
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dsa->pub_key=pub_key;
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2011-01-26 23:46:26 +08:00
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#ifdef OPENSSL_FIPS
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if(!fips_check_dsa(dsa))
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2011-02-11 22:21:01 +08:00
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{
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dsa->pub_key = NULL;
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dsa->priv_key = NULL;
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goto err;
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}
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2011-01-26 23:46:26 +08:00
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#endif
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1998-12-21 18:52:47 +08:00
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ok=1;
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err:
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if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key);
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if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key);
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if (ctx != NULL) BN_CTX_free(ctx);
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return(ok);
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}
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1999-04-27 12:18:53 +08:00
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#endif
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