| | 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 | #include "cryptlib.h" |
| | 62 | #ifndef OPENSSL_NO_SHA |
| | 63 | #include <openssl/bn.h> |
| | 64 | #include <openssl/dsa.h> |
| | 65 | #include <openssl/rand.h> |
| | 66 | |
| | 67 | static int dsa_builtin_keygen(DSA *dsa); |
| | 68 | |
| | 69 | int DSA_generate_key(DSA *dsa) |
| | 70 | { |
| | 71 | if(dsa->meth->dsa_keygen) |
| | 72 | return dsa->meth->dsa_keygen(dsa); |
| | 73 | return dsa_builtin_keygen(dsa); |
| | 74 | } |
| | 75 | |
| | 76 | static int dsa_builtin_keygen(DSA *dsa) |
| | 77 | { |
| | 78 | int ok=0; |
| | 79 | BN_CTX *ctx=NULL; |
| | 80 | BIGNUM *pub_key=NULL,*priv_key=NULL; |
| | 81 | |
| | 82 | if ((ctx=BN_CTX_new()) == NULL) goto err; |
| | 83 | |
| | 84 | if (dsa->priv_key == NULL) |
| | 85 | { |
| | 86 | if ((priv_key=BN_new()) == NULL) goto err; |
| | 87 | } |
| | 88 | else |
| | 89 | priv_key=dsa->priv_key; |
| | 90 | |
| | 91 | do |
| | 92 | if (!BN_rand_range(priv_key,dsa->q)) goto err; |
| | 93 | while (BN_is_zero(priv_key)); |
| | 94 | |
| | 95 | if (dsa->pub_key == NULL) |
| | 96 | { |
| | 97 | if ((pub_key=BN_new()) == NULL) goto err; |
| | 98 | } |
| | 99 | else |
| | 100 | pub_key=dsa->pub_key; |
| | 101 | |
| | 102 | { |
| | 103 | BIGNUM local_prk; |
| | 104 | BIGNUM *prk; |
| | 105 | |
| | 106 | if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) |
| | 107 | { |
| | 108 | BN_init(&local_prk); |
| | 109 | prk = &local_prk; |
| | 110 | BN_with_flags(prk, priv_key, BN_FLG_EXP_CONSTTIME); |
| | 111 | } |
| | 112 | else |
| | 113 | prk = priv_key; |
| | 114 | |
| | 115 | if (!BN_mod_exp(pub_key,dsa->g,prk,dsa->p,ctx)) goto err; |
| | 116 | } |
| | 117 | |
| | 118 | dsa->priv_key=priv_key; |
| | 119 | dsa->pub_key=pub_key; |
| | 120 | ok=1; |
| | 121 | |
| | 122 | err: |
| | 123 | if ((pub_key != NULL) && (dsa->pub_key == NULL)) BN_free(pub_key); |
| | 124 | if ((priv_key != NULL) && (dsa->priv_key == NULL)) BN_free(priv_key); |
| | 125 | if (ctx != NULL) BN_CTX_free(ctx); |
| | 126 | return(ok); |
| | 127 | } |
| | 128 | #endif |
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