From e7c91df1c9c94b28cbab89e03d144f26b2ca0910 Mon Sep 17 00:00:00 2001
From: "Pavel V. Shatov (Meister)" <meisterpaul1@yandex.ru>
Date: Mon, 24 Sep 2018 21:35:32 +0300
Subject: Modular math routines

---
 curve25519/curve25519_fpga_modular.h | 78 ++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 curve25519/curve25519_fpga_modular.h

(limited to 'curve25519/curve25519_fpga_modular.h')

diff --git a/curve25519/curve25519_fpga_modular.h b/curve25519/curve25519_fpga_modular.h
new file mode 100644
index 0000000..c5f2cb0
--- /dev/null
+++ b/curve25519/curve25519_fpga_modular.h
@@ -0,0 +1,78 @@
+//------------------------------------------------------------------------------
+//
+// curve25519_fpga_modular.h
+// ------------------------------------------
+// Modular arithmetic routines for Curve25519
+//
+// Authors: Pavel Shatov
+//
+// Copyright (c) 2015-2016, 2018 NORDUnet A/S
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are met:
+//
+// - Redistributions of source code must retain the above copyright notice,
+//   this list of conditions and the following disclaimer.
+//
+// - 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.
+//
+// - Neither the name of the NORDUnet nor the names of its contributors may be
+//   used to endorse or promote products derived from this software without
+//   specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "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 COPYRIGHT HOLDER 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.
+//
+//------------------------------------------------------------------------------
+
+
+//------------------------------------------------------------------------------
+// Curve25519 Parameters
+//------------------------------------------------------------------------------
+
+/* modulus (2^255 - 19) */
+#define CURVE25519_1P_INIT		{0x7FFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, \
+								 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFED}
+
+/* double modulus (2^256 - 38) */
+#define CURVE25519_2P_INIT		{0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, \
+								 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFFF, 0xFFFFFFDA}
+
+//------------------------------------------------------------------------------
+// Globals
+//------------------------------------------------------------------------------
+extern FPGA_BUFFER CURVE25519_1P;
+extern FPGA_BUFFER CURVE25519_2P;
+
+
+//------------------------------------------------------------------------------
+// Prototypes
+//------------------------------------------------------------------------------
+void	fpga_modular_init					();
+
+void	fpga_modular_add					(const FPGA_BUFFER *A, const FPGA_BUFFER *B, FPGA_BUFFER *S, const FPGA_BUFFER *N);
+void	fpga_modular_sub					(const FPGA_BUFFER *A, const FPGA_BUFFER *B, FPGA_BUFFER *D, const FPGA_BUFFER *N);
+
+void	fpga_modular_mul					(const FPGA_BUFFER *A, const FPGA_BUFFER *B, FPGA_BUFFER *P, const FPGA_BUFFER *N);
+
+void	fpga_modular_inv_abstract			(const FPGA_BUFFER *A, FPGA_BUFFER *A1, const FPGA_BUFFER *N);
+
+void	fpga_modular_mul_helper_multiply	(const FPGA_BUFFER *A, const FPGA_BUFFER *B, FPGA_WORD_EXTENDED *SI);
+void	fpga_modular_mul_helper_accumulate	(const FPGA_WORD_EXTENDED *SI, FPGA_WORD *C);
+void	fpga_modular_mul_helper_reduce		(const FPGA_WORD *C, FPGA_BUFFER *P, const FPGA_BUFFER *N);
+
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------
-- 
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