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/* $OpenBSD: dsa_key.c,v 1.23 2017/01/21 09:38:59 beck Exp $ */ |
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/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
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* All rights reserved. |
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* |
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* This package is an SSL implementation written |
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* by Eric Young (eay@cryptsoft.com). |
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* The implementation was written so as to conform with Netscapes SSL. |
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* |
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* This library is free for commercial and non-commercial use as long as |
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* the following conditions are aheared to. The following conditions |
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* apply to all code found in this distribution, be it the RC4, RSA, |
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* lhash, DES, etc., code; not just the SSL code. The SSL documentation |
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* included with this distribution is covered by the same copyright terms |
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* except that the holder is Tim Hudson (tjh@cryptsoft.com). |
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* |
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* Copyright remains Eric Young's, and as such any Copyright notices in |
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* the code are not to be removed. |
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* If this package is used in a product, Eric Young should be given attribution |
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* as the author of the parts of the library used. |
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* This can be in the form of a textual message at program startup or |
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* in documentation (online or textual) provided with the package. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. All advertising materials mentioning features or use of this software |
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* must display the following acknowledgement: |
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* "This product includes cryptographic software written by |
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* Eric Young (eay@cryptsoft.com)" |
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* The word 'cryptographic' can be left out if the rouines from the library |
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* being used are not cryptographic related :-). |
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* 4. If you include any Windows specific code (or a derivative thereof) from |
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* the apps directory (application code) you must include an acknowledgement: |
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* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)" |
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* |
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* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* The licence and distribution terms for any publically available version or |
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* derivative of this code cannot be changed. i.e. this code cannot simply be |
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* copied and put under another distribution licence |
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* [including the GNU Public Licence.] |
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*/ |
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#include <stdio.h> |
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#include <time.h> |
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#include <openssl/opensslconf.h> |
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#ifndef OPENSSL_NO_SHA |
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#include <openssl/bn.h> |
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#include <openssl/dsa.h> |
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#include "bn_lcl.h" |
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static int dsa_builtin_keygen(DSA *dsa); |
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int |
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DSA_generate_key(DSA *dsa) |
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{ |
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✗✓ |
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if (dsa->meth->dsa_keygen) |
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return dsa->meth->dsa_keygen(dsa); |
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return dsa_builtin_keygen(dsa); |
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} |
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static int |
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dsa_builtin_keygen(DSA *dsa) |
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{ |
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int ok = 0; |
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BN_CTX *ctx = NULL; |
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BIGNUM *pub_key = NULL, *priv_key = NULL; |
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✓✗ |
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if ((ctx = BN_CTX_new()) == NULL) |
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goto err; |
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✓✗ |
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if (dsa->priv_key == NULL) { |
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✓✗ |
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if ((priv_key = BN_new()) == NULL) |
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goto err; |
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} else |
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priv_key=dsa->priv_key; |
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do { |
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✓✗ |
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if (!BN_rand_range(priv_key, dsa->q)) |
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goto err; |
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✗✓ |
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} while (BN_is_zero(priv_key)); |
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✓✗ |
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if (dsa->pub_key == NULL) { |
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✓✗ |
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if ((pub_key = BN_new()) == NULL) |
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goto err; |
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} else |
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pub_key=dsa->pub_key; |
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{ |
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BIGNUM prk; |
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BN_with_flags(&prk, priv_key, BN_FLG_CONSTTIME); |
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✗✓ |
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if (!BN_mod_exp_ct(pub_key, dsa->g, &prk, dsa->p, ctx)) |
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goto err; |
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✓✓✓ |
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} |
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dsa->priv_key = priv_key; |
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dsa->pub_key = pub_key; |
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ok = 1; |
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err: |
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✓✗✗✓
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if (pub_key != NULL && dsa->pub_key == NULL) |
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BN_free(pub_key); |
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✓✗✗✓
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if (priv_key != NULL && dsa->priv_key == NULL) |
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BN_free(priv_key); |
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BN_CTX_free(ctx); |
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return ok; |
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} |
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#endif |