-/* crypto/dsa/dsa_key.c */
-/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
- * All rights reserved.
+/*
+ * Copyright 1995-2016 The OpenSSL Project Authors. 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.]
+ * Licensed under the OpenSSL license (the "License"). You may not use
+ * this file except in compliance with the License. You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
*/
-#ifndef OPENSSL_NO_SHA
#include <stdio.h>
#include <time.h>
-#include "cryptlib.h"
-#include <openssl/sha.h>
+#include "internal/cryptlib.h"
#include <openssl/bn.h>
-#include <openssl/dsa.h>
-#include <openssl/rand.h>
+#include "dsa_locl.h"
+
+static int dsa_builtin_keygen(DSA *dsa);
int DSA_generate_key(DSA *dsa)
- {
- int ok=0;
- BN_CTX *ctx=NULL;
- BIGNUM *pub_key=NULL,*priv_key=NULL;
+{
+ 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 ((ctx = BN_CTX_new()) == NULL)
+ goto err;
+
+ if (dsa->priv_key == NULL) {
+ if ((priv_key = BN_secure_new()) == NULL)
+ goto err;
+ } else
+ priv_key = dsa->priv_key;
- if ((ctx=BN_CTX_new()) == NULL) goto err;
+ do
+ if (!BN_rand_range(priv_key, dsa->q))
+ goto err;
+ while (BN_is_zero(priv_key)) ;
- if (dsa->priv_key == NULL)
- {
- if ((priv_key=BN_new()) == NULL) goto err;
- }
- else
- priv_key=dsa->priv_key;
+ if (dsa->pub_key == NULL) {
+ if ((pub_key = BN_new()) == NULL)
+ goto err;
+ } else
+ pub_key = dsa->pub_key;
- do
- if (!BN_rand_range(priv_key,dsa->q)) goto err;
- while (BN_is_zero(priv_key));
+ {
+ BIGNUM *prk = BN_new();
- if (dsa->pub_key == NULL)
- {
- if ((pub_key=BN_new()) == NULL) goto err;
- }
- else
- pub_key=dsa->pub_key;
+ if (prk == NULL)
+ goto err;
+ BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
- if (!BN_mod_exp(pub_key,dsa->g,priv_key,dsa->p,ctx)) goto err;
+ if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx)) {
+ BN_free(prk);
+ goto err;
+ }
+ /* We MUST free prk before any further use of priv_key */
+ BN_free(prk);
+ }
- dsa->priv_key=priv_key;
- dsa->pub_key=pub_key;
- ok=1;
+ dsa->priv_key = priv_key;
+ dsa->pub_key = pub_key;
+ 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
+ err:
+ if (pub_key != dsa->pub_key)
+ BN_free(pub_key);
+ if (priv_key != dsa->priv_key)
+ BN_free(priv_key);
+ BN_CTX_free(ctx);
+ return (ok);
+}
projects / openssl.git / blobdiff