Promote code common to both ECDSA* cores to separate repository in core/ tree.

Pavel's two ECDSA base point multiplier cores share a fair amount of
code.  Maintenance issues aside, the duplication confused the Xilinx
synthesis tools if one tried to build a single bitstream containing
both cores, so we've separated the common code out into this library.

The selection of files in this library was done by comparing the rtl
trees of the two original core repositories using "diff -rqws" and
selecting the files which diff reported as being identical.

Also dealt with some cosmetic issues (indentation, Windows-isms, etc).

1 files changed, 0 insertions, 356 deletions

diff --git a/bench/tb_modular_subtractor.v b/bench/tb_modular_subtractor.v
deleted file mode 100644
index f45a286..0000000
--- a/bench/tb_modular_subtractor.v
+++ /dev/null
@@ -1,356 +0,0 @@
-//------------------------------------------------------------------------------
-//
-// tb_modular_subtractor_256.v
-// -----------------------------------------------------------------------------
-// Testbench for modular multi-word subtractor.
-//
-// Authors: Pavel Shatov
-//
-// Copyright (c) 2016, 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.
-//
-//------------------------------------------------------------------------------
-
-//------------------------------------------------------------------------------
-`timescale 1ns / 1ps
-//------------------------------------------------------------------------------
-
-module tb_modular_subtractor_256;
-
-
-		//
-		// Test Vectors
-		//	
-	localparam	[255:0]	N		= 256'hffffffff00000001000000000000000000000000ffffffffffffffffffffffff;
-		
-	localparam	[255:0]	X_1	= 256'h1ddbd0769df27bab1e234019dad09dccce1e87e2193b417ffa1a3465d7439ecd;
-	localparam	[255:0]	Y_1	= 256'h1f67cdc34bac91a072945d212f0a03442fc4855788583ecb7b2e375ad3848210;
-	
-	localparam	[255:0]	X_2	= 256'hff563f653b1392a6fa6b0295a280f7a904a11e22d8ae468e220301d8ac232fcf;
-	localparam	[255:0]	Y_2	= 256'hf6f53c4b57b25453b68e923fb118e4f753d74af01fc58476dd15a80933453899;
-	
-	
-		//
-		// Core Parameters
-		//
-	localparam	WORD_COUNTER_WIDTH	=  3;
-	localparam	OPERAND_NUM_WORDS		=  8;
-	
-
-		//
-		// Clock (100 MHz)
-		//
-	reg clk = 1'b0;
-	always #5 clk = ~clk;
-
-	
-		//
-		// Inputs, Outputs
-		//
-	reg				rst_n;
-	reg				ena;
-	wire				rdy;
-	
-	
-		//
-		// Buffers (X, Y, N)
-		//
-	wire	[WORD_COUNTER_WIDTH-1:0]	core_xy_addr;
-	wire	[WORD_COUNTER_WIDTH-1:0]	core_n_addr;
-	wire	[WORD_COUNTER_WIDTH-1:0]	core_d_addr;
-	wire										core_d_wren;
-	
-	wire	[                  31:0]	core_x_data;
-	wire	[                  31:0]	core_y_data;
-	wire	[                  31:0]	core_n_data;
-	wire	[                  31:0]	core_d_data;
-	
-	reg	[WORD_COUNTER_WIDTH-1:0]	tb_xyn_addr;
-	reg	[WORD_COUNTER_WIDTH-1:0]	tb_d_addr;
-	reg										tb_xyn_wren;
-	
-	reg	[                  31:0]	tb_x_data;
-	reg	[                  31:0]	tb_y_data;
-	reg	[                  31:0]	tb_n_data;
-	wire	[                  31:0]	tb_d_data;
-	
-	bram_1rw_1ro_readfirst #
-	(
-		.MEM_WIDTH			(32),
-		.MEM_ADDR_BITS		(WORD_COUNTER_WIDTH)
-	)
-	bram_x
-	(
-		.clk		(clk),
-
-		.a_addr	(tb_xyn_addr),
-		.a_wr		(tb_xyn_wren),
-		.a_in		(tb_x_data),
-		.a_out	(),
-
-		.b_addr	(core_xy_addr),
-		.b_out	(core_x_data)
-	);
-
-	bram_1rw_1ro_readfirst #
-	(
-		.MEM_WIDTH			(32),
-		.MEM_ADDR_BITS		(WORD_COUNTER_WIDTH)
-	)
-	bram_y
-	(
-		.clk		(clk),
-
-		.a_addr	(tb_xyn_addr),
-		.a_wr		(tb_xyn_wren),
-		.a_in		(tb_y_data),
-		.a_out	(),
-
-		.b_addr	(core_xy_addr),
-		.b_out	(core_y_data)
-	);
-	
-	bram_1rw_1ro_readfirst #
-	(
-		.MEM_WIDTH			(32),
-		.MEM_ADDR_BITS		(WORD_COUNTER_WIDTH)
-	)
-	bram_n
-	(
-		.clk		(clk),
-
-		.a_addr	(tb_xyn_addr),
-		.a_wr		(tb_xyn_wren),
-		.a_in		(tb_n_data),
-		.a_out	(),
-
-		.b_addr	(core_n_addr),
-		.b_out	(core_n_data)
-	);
-	
-	bram_1rw_1ro_readfirst #
-	(
-		.MEM_WIDTH			(32),
-		.MEM_ADDR_BITS		(WORD_COUNTER_WIDTH)
-	)
-	bram_s
-	(
-		.clk		(clk),
-
-		.a_addr	(core_d_addr),
-		.a_wr		(core_d_wren),
-		.a_in		(core_d_data),
-		.a_out	(),
-
-		.b_addr	(tb_d_addr),
-		.b_out	(tb_d_data)
-	);
-	
-	
-		//
-		// UUT
-		//
-	modular_subtractor #
-	(
-		.WORD_COUNTER_WIDTH	(WORD_COUNTER_WIDTH),
-		.OPERAND_NUM_WORDS	(OPERAND_NUM_WORDS)
-	)
-	uut
-	(
-		.clk			(clk),
-		.rst_n		(rst_n),
-		
-		.ena			(ena),
-		.rdy			(rdy),
-		
-		.ab_addr		(core_xy_addr),
-		.n_addr		(core_n_addr),
-		.d_addr		(core_d_addr),
-		.d_wren		(core_d_wren),
-		
-		.a_din		(core_x_data),
-		.b_din		(core_y_data),
-		.n_din		(core_n_data),
-		.d_dout		(core_d_data)
-	);
-		
-		
-		//
-		// Testbench Routine
-		//
-	reg ok = 1;
-	initial begin
-		
-			/* initialize control inputs */
-		rst_n			= 0;
-		ena			= 0;
-		
-		tb_xyn_wren	= 0;
-		
-			/* wait for some time */
-		#200;
-		
-			/* de-assert reset */
-		rst_n		= 1;
-		
-			/* wait for some time */
-		#100;		
-		
-			/* run tests */
-		test_modular_subtractor(X_1, Y_1, N);
-		test_modular_subtractor(X_2, Y_2, N);
-		test_modular_subtractor(Y_1, X_1, N);
-		test_modular_subtractor(Y_2, X_2, N);
-
-		test_modular_subtractor(X_1, X_2, N);
-		test_modular_subtractor(X_2, X_1, N);
-		test_modular_subtractor(Y_1, Y_2, N);
-		test_modular_subtractor(Y_2, Y_1, N);
-		
-		test_modular_subtractor(X_1, Y_2, N);
-		test_modular_subtractor(Y_2, X_1, N);
-		test_modular_subtractor(X_2, Y_1, N);
-		test_modular_subtractor(Y_1, X_2, N);		
-		
-			/* print result */
-		if (ok)	$display("tb_modular_subtractor_256: SUCCESS");
-		else		$display("tb_modular_subtractor_256: FAILURE");
-		//
-		$finish;
-		//
-	end
-	
-	
-		//
-		// Test Task
-		//	
-	reg	[256:0]	d;
-	wire	[255:0]	d_dummy = d[255:0];
-	reg				d_ok;
-
-	integer			w;
-	
-	reg	[255:0]	x_shreg;
-	reg	[255:0]	y_shreg;
-	reg	[255:0]	n_shreg;
-	reg	[255:0]	d_shreg;
-	
-	task test_modular_subtractor;
-	
-		input	[255:0]	x;
-		input	[255:0]	y;
-		input	[255:0]	n;
-				
-		begin
-		
-				/* start filling memories */
-			tb_xyn_wren	= 1;
-			
-				/* initialize shift registers */
-			x_shreg = x;
-			y_shreg = y;
-			n_shreg = n;
-			
-				/* write all the words */
-			for (w=0; w<OPERAND_NUM_WORDS; w=w+1) begin
-				
-					/* set addresses */
-				tb_xyn_addr	= w[WORD_COUNTER_WIDTH-1:0];
-				
-					/* set data words */
-				tb_x_data	= x_shreg[31:0];
-				tb_y_data	= y_shreg[31:0];
-				tb_n_data	= n_shreg[31:0];
-				
-					/* shift inputs */
-				x_shreg = {{32{1'bX}}, x_shreg[255:32]};
-				y_shreg = {{32{1'bX}}, y_shreg[255:32]};
-				n_shreg = {{32{1'bX}}, n_shreg[255:32]};
-				
-					/* wait for 1 clock tick */
-				#10;
-				
-			end
-			
-				/* wipe addresses */
-			tb_xyn_addr	= {WORD_COUNTER_WIDTH{1'bX}};
-			
-				/* wipe data words */
-			tb_x_data	= {32{1'bX}};
-			tb_y_data	= {32{1'bX}};
-			tb_n_data	= {32{1'bX}};
-			
-				/* stop filling memories */
-			tb_xyn_wren	= 0;
-						
-				/* calculate reference value */
-			d = {1'b0, (x < y) ? n : {256{1'b0}}};
-			d = d + {1'b0, x} - {1'b0, y};
-			
-				/* start operation */
-			ena = 1;
-			
-				/* clear flag */
-			#10 ena = 0;
-			
-				/* wait for operation to complete */
-			while (!rdy) #10;
-			
-				/* read result */
-			for (w=0; w<OPERAND_NUM_WORDS; w=w+1) begin
-				
-					/* set address */
-				tb_d_addr	= w[WORD_COUNTER_WIDTH-1:0];
-				
-					/* wait for 1 clock tick */
-				#10;
-				
-					/* store data word */
-				d_shreg = {tb_d_data, d_shreg[255:32]};
-
-			end				
-			
-				/* compare */
-			d_ok = (d_shreg == d[255:0]);
-
-				/* display results */
-			$display("test_modular_subtractor(): %s", d_ok ? "OK" : "ERROR");
-			
-				/* update global flag */
-			ok = ok && d_ok;
-		
-		end
-		
-	endtask
-	
-      
-endmodule
-
-//------------------------------------------------------------------------------
-// End-of-File
-//------------------------------------------------------------------------------