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- /* crypto/dsa/dsa_key.c */
- /* 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>
- #ifndef OPENSSL_NO_SHA
- # include <openssl/bn.h>
- # include <openssl/dsa.h>
- # include <openssl/rand.h>
- # include <openssl/err.h>
- # include <openssl/evp.h>
- # include <openssl/fips.h>
- # include "fips_locl.h"
- # ifdef OPENSSL_FIPS
- static int fips_dsa_pairwise_fail = 0;
- void FIPS_corrupt_dsa_keygen(void)
- {
- fips_dsa_pairwise_fail = 1;
- }
- static int dsa_builtin_keygen(DSA *dsa);
- static int fips_check_dsa(DSA *dsa)
- {
- EVP_PKEY pk;
- unsigned char tbs[] = "DSA Pairwise Check Data";
- pk.type = EVP_PKEY_DSA;
- pk.pkey.dsa = dsa;
- if (!fips_pkey_signature_test(&pk, tbs, -1, NULL, 0, EVP_dss1(), 0, NULL)) {
- FIPSerr(FIPS_F_FIPS_CHECK_DSA, FIPS_R_PAIRWISE_TEST_FAILED);
- fips_set_selftest_fail();
- return 0;
- }
- return 1;
- }
- 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 (FIPS_mode()
- && (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS)) {
- DSAerr(DSA_F_DSA_BUILTIN_KEYGEN, DSA_R_KEY_SIZE_TOO_SMALL);
- goto err;
- }
- 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 local_prk;
- BIGNUM *prk;
- if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
- BN_init(&local_prk);
- prk = &local_prk;
- BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
- } else
- prk = priv_key;
- if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx))
- goto err;
- }
- dsa->priv_key = priv_key;
- dsa->pub_key = pub_key;
- if (fips_dsa_pairwise_fail)
- BN_add_word(dsa->pub_key, 1);
- if (!fips_check_dsa(dsa))
- goto err;
- 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);
- if (ctx != NULL)
- BN_CTX_free(ctx);
- return (ok);
- }
- # endif
- #endif
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