2024-02-21 04:55:34 +00:00
|
|
|
///////////////////////////////////////////
|
2024-03-09 19:06:36 +00:00
|
|
|
// galoismultforward.sv
|
2024-02-21 04:55:34 +00:00
|
|
|
//
|
2024-03-04 21:23:11 +00:00
|
|
|
// Written: ryan.swann@okstate.edu, james.stine@okstate.edu, David_Harris@hmc.edu
|
2024-02-21 04:55:34 +00:00
|
|
|
// Created: 20 February 2024
|
|
|
|
//
|
|
|
|
// Purpose: Galois field operations for mix columns operation
|
|
|
|
//
|
|
|
|
// A component of the CORE-V-WALLY configurable RISC-V project.
|
|
|
|
// https://github.com/openhwgroup/cvw
|
|
|
|
//
|
|
|
|
// Copyright (C) 2021-24 Harvey Mudd College & Oklahoma State University
|
|
|
|
//
|
|
|
|
// SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
|
|
|
|
//
|
|
|
|
// Licensed under the Solderpad Hardware License v 2.1 (the “License”); you may not use this file
|
|
|
|
// except in compliance with the License, or, at your option, the Apache License version 2.0. You
|
|
|
|
// may obtain a copy of the License at
|
|
|
|
//
|
|
|
|
// https://solderpad.org/licenses/SHL-2.1/
|
|
|
|
//
|
|
|
|
// Unless required by applicable law or agreed to in writing, any work distributed under the
|
|
|
|
// License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
|
|
|
|
// either express or implied. See the License for the specific language governing permissions
|
|
|
|
// and limitations under the License.
|
|
|
|
////////////////////////////////////////////////////////////////////////////////////////////////
|
|
|
|
|
2024-03-16 14:12:36 +00:00
|
|
|
module galoismultforward8(
|
2024-03-11 04:27:11 +00:00
|
|
|
input logic [7:0] a,
|
|
|
|
output logic [7:0] y
|
2024-03-11 03:36:29 +00:00
|
|
|
);
|
2024-03-04 21:23:11 +00:00
|
|
|
|
|
|
|
logic [7:0] leftshift;
|
|
|
|
|
2024-03-11 04:27:11 +00:00
|
|
|
assign leftshift = {a[6:0], 1'b0};
|
|
|
|
assign y = a[7] ? (leftshift ^ 8'b00011011) : leftshift;
|
2024-03-04 21:23:11 +00:00
|
|
|
endmodule
|