1/* crypto/dsa/dsa_key.c */ 2/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) 3 * All rights reserved. 4 * 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. 8 * 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). 15 * 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. 22 * 23 * Redistribution and use in source and binary forms, with or without 24 * modification, are permitted provided that the following conditions 25 * are met: 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)" 40 * 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 51 * SUCH DAMAGE. 52 * 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.] 57 */ 58 59#include <stdio.h> 60#include <time.h> 61#ifndef OPENSSL_NO_SHA 62#include <openssl/bn.h> 63#include <openssl/dsa.h> 64#include <openssl/rand.h> 65#include <openssl/err.h> 66#include <openssl/evp.h> 67#include <openssl/fips.h> 68#include "fips_locl.h" 69 70#ifdef OPENSSL_FIPS 71 72static int fips_dsa_pairwise_fail = 0; 73 74void FIPS_corrupt_dsa_keygen(void) 75 { 76 fips_dsa_pairwise_fail = 1; 77 } 78 79static int dsa_builtin_keygen(DSA *dsa); 80 81static int fips_check_dsa(DSA *dsa) 82 { 83 EVP_PKEY pk; 84 unsigned char tbs[] = "DSA Pairwise Check Data"; 85 pk.type = EVP_PKEY_DSA; 86 pk.pkey.dsa = dsa; 87 88 if (!fips_pkey_signature_test(&pk, tbs, -1, 89 NULL, 0, EVP_dss1(), 0, NULL)) 90 { 91 FIPSerr(FIPS_F_FIPS_CHECK_DSA,FIPS_R_PAIRWISE_TEST_FAILED); 92 fips_set_selftest_fail(); 93 return 0; 94 } 95 return 1; 96 } 97 98int DSA_generate_key(DSA *dsa) 99 { 100 if(dsa->meth->dsa_keygen) 101 return dsa->meth->dsa_keygen(dsa); 102 return dsa_builtin_keygen(dsa); 103 } 104 105static int dsa_builtin_keygen(DSA *dsa) 106 { 107 int ok=0; 108 BN_CTX *ctx=NULL; 109 BIGNUM *pub_key=NULL,*priv_key=NULL; 110 111 if (FIPS_mode() && (BN_num_bits(dsa->p) < OPENSSL_DSA_FIPS_MIN_MODULUS_BITS)) 112 { 113 DSAerr(DSA_F_DSA_BUILTIN_KEYGEN, DSA_R_KEY_SIZE_TOO_SMALL); 114 goto err; 115 } 116 117 if ((ctx=BN_CTX_new()) == NULL) goto err; 118 119 if (dsa->priv_key == NULL) 120 { 121 if ((priv_key=BN_new()) == NULL) goto err; 122 } 123 else 124 priv_key=dsa->priv_key; 125 126 do 127 if (!BN_rand_range(priv_key,dsa->q)) goto err; 128 while (BN_is_zero(priv_key)); 129 130 if (dsa->pub_key == NULL) 131 { 132 if ((pub_key=BN_new()) == NULL) goto err; 133 } 134 else 135 pub_key=dsa->pub_key; 136 137 { 138 BIGNUM local_prk; 139 BIGNUM *prk; 140 141 if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) 142 { 143 BN_init(&local_prk); 144 prk = &local_prk; 145 BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME); 146 } 147 else 148 prk = priv_key; 149 150 if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err; 151 } 152 153 dsa->priv_key=priv_key; 154 dsa->pub_key=pub_key; 155 if (fips_dsa_pairwise_fail) 156 BN_add_word(dsa->pub_key, 1); 157 if(!fips_check_dsa(dsa)) 158 goto err; 159 ok=1; 160 161err: 162 if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key); 163 if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key); 164 if (ctx != NULL) BN_CTX_free(ctx); 165 return(ok); 166 } 167#endif 168 169#endif 170