ecc: Prepare for future Ed25519 optimization.

* mpi/ec-ed25519.c: New but empty file.
* mpi/ec-internal.h: New.
* mpi/ec.c: Include ec-internal.h.
(ec_mod): New.
(ec_addm): Use ec_mod.
(ec_mulm): Remove commented code.  Use ec_mod.
(ec_subm): Call simple sub.
(ec_pow2): Use ec_mulm.
(ec_mul2): New.
(dup_point_weierstrass): Use ec_mul2.
(dup_point_twistededwards): Add special case for a == -1.  Use
ec_mul2.
(add_points_weierstrass): Use ec_mul2.
(add_points_twistededwards): Add special case for a == -1.
(_gcry_mpi_ec_curve_point): Ditto.
(ec_p_init): Add hack to test Barrett functions.
* src/ec-context.h (mpi_ec_ctx_s): Add P_BARRETT.

* mpi/mpi-mod.c (_gcry_mpi_mod_barrett): Fix sign problem.

Signed-off-by: Werner Koch <wk@gnupg.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/mpi/ec-ed25519.c b/mpi/ec-ed25519.c
new file mode 100644
index 00000000..acfe2a69
--- /dev/null
+++ b/mpi/ec-ed25519.c
@@ -0,0 +1,37 @@
+/* ec-ed25519.c -  Ed25519 optimized elliptic curve functions
+ * Copyright (C) 2013 g10 Code GmbH
+ *
+ * This file is part of Libgcrypt.
+ *
+ * Libgcrypt is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as
+ * published by the Free Software Foundation; either version 2.1 of
+ * the License, or (at your option) any later version.
+ *
+ * Libgcrypt is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this program; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <config.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <errno.h>
+
+#include "mpi-internal.h"
+#include "longlong.h"
+#include "g10lib.h"
+#include "context.h"
+#include "ec-context.h"
+
+
+void
+_gcry_mpi_ec_ed25519_mod (gcry_mpi_t a)
+{
+  (void)a;
+
+}