cryptography ip-cores in vhdl / verilog
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// ======================================================================
// TDES encryption/decryption
// algorithm according:FIPS 46-3 specification
// Copyright (C) 2013 Torsten Meissner
//-----------------------------------------------------------------------
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write:the Free Software
// Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
// ======================================================================
`timescale 1ns/1ps
module tdes
(
input reset_i, // async reset
input clk_i, // clock
input mode_i, // des-mode: 0 = encrypt, 1 = decrypt
input [0:63] key1_i, // key input
input [0:63] key2_i, // key input
input [0:63] key3_i, // key input
input [0:63] data_i, // data input
input valid_i, // input key/data valid flag
output [0:63] data_o, // data output
output valid_o, // output data valid flag
output reg ready_o // ready for new data
);
reg reset;
reg mode;
reg [0:63] key1;
reg [0:63] key2;
reg [0:63] key3;
wire des2_mode;
wire des1_validin;
wire [0:63] des1_key;
wire [0:63] des3_key;
wire [0:63] des1_dataout;
wire [0:63] des2_dataout;
wire des1_validout;
wire des2_validout;
assign des2_mode = ~mode;
assign des1_validin = valid_i & ready_o;
assign des1_key = (~mode_i) ? key1_i : key3_i;
assign des3_key = (~mode) ? key3 : key1;
// input register
always @(posedge clk_i, negedge reset_i) begin
if (~reset_i) begin
reset <= 0;
mode <= 0;
key1 <= 0;
key2 <= 0;
key3 <= 0;
end
else begin
reset <= reset_i;
if (valid_i && ready_o) begin
mode <= mode_i;
key1 <= key1_i;
key2 <= key2_i;
key3 <= key3_i;
end
end
end
// output register
always @(posedge clk_i, negedge reset_i) begin
if (~reset_i) begin
ready_o <= 0;
end
else begin
if (valid_i && ready_o) begin
ready_o <= 0;
end
if (valid_o || (reset_i && ~reset)) begin
ready_o <= 1;
end
end
end
des i1_des
(
.reset_i(reset_i),
.clk_i(clk_i),
.mode_i(mode_i),
.key_i(des1_key),
.data_i(data_i),
.valid_i(des1_validin),
.data_o(des1_dataout),
.valid_o(des1_validout)
);
des i2_des
(
.reset_i(reset_i),
.clk_i(clk_i),
.mode_i(des2_mode),
.key_i(key2),
.data_i(des1_dataout),
.valid_i(des1_validout),
.data_o(des2_dataout),
.valid_o(des2_validout)
);
des i3_des
(
.reset_i(reset_i),
.clk_i(clk_i),
.mode_i(mode),
.key_i(des3_key),
.data_i(des2_dataout),
.valid_i(des2_validout),
.data_o(data_o),
.valid_o(valid_o)
);
endmodule