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51 lines
2.1 KiB
Systemverilog
51 lines
2.1 KiB
Systemverilog
///////////////////////////////////////////
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// aes64ks1i.sv
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//
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// Written: ryan.swann@okstate.edu, james.stine@okstate.edu
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// Created: 20 February 2024
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//
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// Purpose: aes64ks1i instruction: part of AES keyschedule with involving sbox
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//
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// A component of the CORE-V-WALLY configurable RISC-V project.
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// https://github.com/openhwgroup/cvw
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//
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// Copyright (C) 2021-24 Harvey Mudd College & Oklahoma State University
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//
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// SPDX-License-Identifier: Apache-2.0 WITH SHL-2.1
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//
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// Licensed under the Solderpad Hardware License v 2.1 (the “License”); you may not use this file
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// except in compliance with the License, or, at your option, the Apache License version 2.0. You
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// may obtain a copy of the License at
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//
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// https://solderpad.org/licenses/SHL-2.1/
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//
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// Unless required by applicable law or agreed to in writing, any work distributed under the
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// License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND,
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// either express or implied. See the License for the specific language governing permissions
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// and limitations under the License.
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////////////////////////////////////////////////////////////////////////////////////////////////
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module aes64ks1i(
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input logic [3:0] round,
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input logic [63:0] rs1,
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input logic [31:0] Sbox0Out,
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output logic [31:0] SboxKIn,
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output logic [63:0] result
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);
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logic finalround;
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logic [31:0] rcon, rs1Rotate;
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rconlut32 rc(round, rcon); // Get rcon value from lookup table
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assign rs1Rotate = {rs1[39:32], rs1[63:40]}; // Get rotated value fo ruse in tmp2
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assign finalround = (round == 4'b1010); // round 10 is the last one
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assign SboxKIn = finalround ? rs1[63:32] : rs1Rotate; // Don't rotate on the last round
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// Share sbox with encryption in zknde64. This module just sends value to shared sbox and gets result back
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// send out value as SboxKIn, get back subsittuted result as Sbox0Out
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assign result[31:0] = Sbox0Out ^ rcon;
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assign result[63:32] = Sbox0Out ^ rcon;
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endmodule
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