--- /dev/null
+/* crypto/dsa/dsa_key.c */
+/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
+ * 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.]
+ */
+
+#include <stdio.h>
+#include <time.h>
+#include "cryptlib.h"
+#ifndef OPENSSL_NO_SHA
+# include <openssl/bn.h>
+# include <openssl/dsa.h>
+# include <openssl/rand.h>
+
+# ifdef OPENSSL_FIPS
+# include <openssl/fips.h>
+# endif
+
+static int dsa_builtin_keygen(DSA *dsa);
+
+int DSA_generate_key(DSA *dsa)
+{
+# ifdef OPENSSL_FIPS
+ if (FIPS_mode() && !(dsa->meth->flags & DSA_FLAG_FIPS_METHOD)
+ && !(dsa->flags & DSA_FLAG_NON_FIPS_ALLOW)) {
+ DSAerr(DSA_F_DSA_GENERATE_KEY, DSA_R_NON_FIPS_DSA_METHOD);
+ return 0;
+ }
+# endif
+ if (dsa->meth->dsa_keygen)
+ return dsa->meth->dsa_keygen(dsa);
+# ifdef OPENSSL_FIPS
+ if (FIPS_mode())
+ return FIPS_dsa_generate_key(dsa);
+# endif
+ 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_new()) == NULL)
+ goto err;
+ } else
+ priv_key = dsa->priv_key;
+
+ do
+ if (!BN_rand_range(priv_key, dsa->q))
+ goto err;
+ while (BN_is_zero(priv_key)) ;
+
+ if (dsa->pub_key == NULL) {
+ if ((pub_key = BN_new()) == NULL)
+ goto err;
+ } else
+ pub_key = dsa->pub_key;
+
+ {
+ BIGNUM local_prk;
+ BIGNUM *prk;
+
+ if ((dsa->flags & DSA_FLAG_NO_EXP_CONSTTIME) == 0) {
+ BN_init(&local_prk);
+ prk = &local_prk;
+ BN_with_flags(prk, priv_key, BN_FLG_CONSTTIME);
+ } else
+ prk = priv_key;
+
+ if (!BN_mod_exp(pub_key, dsa->g, prk, dsa->p, ctx))
+ goto err;
+ }
+
+ 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
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