1 /* $OpenBSD: dsa_key.c,v 1.30 2022/01/07 09:35:36 tb Exp $ */ 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 62 #include <openssl/opensslconf.h> 63 64 #ifndef OPENSSL_NO_SHA 65 66 #include <openssl/bn.h> 67 #include <openssl/dsa.h> 68 69 #include "bn_lcl.h" 70 #include "dsa_locl.h" 71 72 static int dsa_builtin_keygen(DSA *dsa); 73 74 int 75 DSA_generate_key(DSA *dsa) 76 { 77 if (dsa->meth->dsa_keygen) 78 return dsa->meth->dsa_keygen(dsa); 79 return dsa_builtin_keygen(dsa); 80 } 81 82 static int 83 dsa_builtin_keygen(DSA *dsa) 84 { 85 int ok = 0; 86 BN_CTX *ctx = NULL; 87 BIGNUM *pub_key = NULL, *priv_key = NULL; 88 89 if ((ctx = BN_CTX_new()) == NULL) 90 goto err; 91 92 if ((priv_key = dsa->priv_key) == NULL) { 93 if ((priv_key = BN_new()) == NULL) 94 goto err; 95 } 96 97 if (!bn_rand_interval(priv_key, BN_value_one(), dsa->q)) 98 goto err; 99 100 if ((pub_key = dsa->pub_key) == NULL) { 101 if ((pub_key = BN_new()) == NULL) 102 goto err; 103 } 104 105 if (!BN_mod_exp_ct(pub_key, dsa->g, priv_key, dsa->p, ctx)) 106 goto err; 107 108 dsa->priv_key = priv_key; 109 dsa->pub_key = pub_key; 110 ok = 1; 111 112 err: 113 if (dsa->pub_key == NULL) 114 BN_free(pub_key); 115 if (dsa->priv_key == NULL) 116 BN_free(priv_key); 117 BN_CTX_free(ctx); 118 return ok; 119 } 120 #endif 121