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authorArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
committerArne Schwabe <arne@rfc2549.org>2012-04-16 19:21:14 +0200
commit3e4d8f433239c40311037616b1b8833a06651ae0 (patch)
tree98ab7fce0d011d34677b0beb762d389cb5c39199 /openssl/crypto/dsa/dsa_key.c
Initial import
Diffstat (limited to 'openssl/crypto/dsa/dsa_key.c')
-rw-r--r--openssl/crypto/dsa/dsa_key.c128
1 files changed, 128 insertions, 0 deletions
diff --git a/openssl/crypto/dsa/dsa_key.c b/openssl/crypto/dsa/dsa_key.c
new file mode 100644
index 00000000..c4aa86bc
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+++ b/openssl/crypto/dsa/dsa_key.c
@@ -0,0 +1,128 @@
+/* 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>
+
+static int dsa_builtin_keygen(DSA *dsa);
+
+int DSA_generate_key(DSA *dsa)
+ {
+ 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_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