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//////////////////////////////////////////////////////////////////////////////
// Copyright (c) 2011, Andrew "bunnie" Huang
// All rights reserved.
//
// 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.
//
// 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.
//
//////////////////////////////////////////////////////////////////////////////
module diff_network (
input wire [6:0] i,
output wire [6:0] o,
input wire [6:0] k
);
assign o[0] = k[0] ^ ^ i[1] ^ i[2] ^ i[3] ^ i[4] ^ i[5] ^ i[6];
assign o[1] = k[1] ^ i[0] ^ ^ i[2] ^ i[3] ^ i[4] ^ i[5] ^ i[6];
assign o[2] = k[2] ^ i[0] ^ i[1] ^ ^ i[3] ^ i[4] ^ i[5] ^ i[6];
assign o[3] = k[3] ^ i[0] ^ i[1] ^ i[2] ^ ^ i[4] ^ i[5] ^ i[6];
assign o[4] = k[4] ^ i[0] ^ i[1] ^ i[2] ^ i[3] ^ ^ i[5] ^ i[6];
assign o[5] = k[5] ^ i[0] ^ i[1] ^ i[2] ^ i[3] ^ i[4] ^ ^ i[6];
assign o[6] = k[6] ^ i[0] ^ i[1] ^ i[2] ^ i[3] ^ i[4] ^ i[5] ^ i[6];
endmodule // diff_network
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