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diff --git a/ecdsa_fpga_lowlevel.h b/ecdsa_fpga_lowlevel.h
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+//------------------------------------------------------------------------------
+//
+// fpga_ecdsa_lowlevel.h
+// -----------------------------------
+// Models of low-level FPGA primitives
+//
+// 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.
+//
+//------------------------------------------------------------------------------
+
+
+//------------------------------------------------------------------------------
+// Headers
+//------------------------------------------------------------------------------
+#include <stdint.h>
+
+
+//------------------------------------------------------------------------------
+// FPGA Pipeline Settings
+//------------------------------------------------------------------------------
+#define FPGA_WORD_WIDTH (32)
+
+
+//------------------------------------------------------------------------------
+// Word Types (Normal 32-bit, Extended 47-bit, Reduced 16-bit)
+//------------------------------------------------------------------------------
+typedef uint32_t FPGA_WORD;
+typedef uint64_t FPGA_WORD_EXTENDED;
+typedef uint16_t FPGA_WORD_REDUCED;
+
+
+//------------------------------------------------------------------------------
+// Wide 47-bit Adder Mask
+//------------------------------------------------------------------------------
+#define FPGA_MASK_ADDER47   ((FPGA_WORD_EXTENDED)0x00007FFFFFFFFFFF)
+
+
+//------------------------------------------------------------------------------
+// Prototypes
+//------------------------------------------------------------------------------
+void fpga_lowlevel_add32 (FPGA_WORD x, FPGA_WORD y, bool c_in, FPGA_WORD *s, bool *c_out);
+void fpga_lowlevel_sub32 (FPGA_WORD x, FPGA_WORD y, bool b_in, FPGA_WORD *d, bool *b_out);
+
+void fpga_lowlevel_mul16 (FPGA_WORD_REDUCED x, FPGA_WORD_REDUCED y, FPGA_WORD *p);
+
+void fpga_lowlevel_add47 (FPGA_WORD_EXTENDED x, FPGA_WORD_EXTENDED y, FPGA_WORD_EXTENDED *s);
+
+
+//------------------------------------------------------------------------------
+// End-of-File
+//------------------------------------------------------------------------------