| /* 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); |
| |
| 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 |
