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cryptography ip-cores in vhdl / verilog
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cryptocores/cbcdes/rtl/verilog/des.v

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// ======================================================================
// DES encryption/decryption
// algorithm according:FIPS 46-3 specification
// Copyright (C) 2012 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 des
(
input reset_i, // async reset
input clk_i, // clock
input mode_i, // des-mode: 0 = encrypt, 1 = decrypt
input [0:63] key_i, // key input
input [0:63] data_i, // data input
input valid_i, // input key/data valid flag
output reg [0:63] data_o, // data output
output valid_o // output data valid flag
);
`include "../../rtl/verilog/des_pkg.v"
// valid, mode register
reg [0:18] valid;
reg [0:17] mode;
// algorithm pipeline register
// key calculation register
reg [0:27] c0;
reg [0:27] c1;
reg [0:27] c2;
reg [0:27] c3;
reg [0:27] c4;
reg [0:27] c5;
reg [0:27] c6;
reg [0:27] c7;
reg [0:27] c8;
reg [0:27] c9;
reg [0:27] c10;
reg [0:27] c11;
reg [0:27] c12;
reg [0:27] c13;
reg [0:27] c14;
reg [0:27] c15;
reg [0:27] c16;
reg [0:27] d0;
reg [0:27] d1;
reg [0:27] d2;
reg [0:27] d3;
reg [0:27] d4;
reg [0:27] d5;
reg [0:27] d6;
reg [0:27] d7;
reg [0:27] d8;
reg [0:27] d9;
reg [0:27] d10;
reg [0:27] d11;
reg [0:27] d12;
reg [0:27] d13;
reg [0:27] d14;
reg [0:27] d15;
reg [0:27] d16;
// key register
wire [0:47] key1;
wire [0:47] key2;
wire [0:47] key3;
wire [0:47] key4;
wire [0:47] key5;
wire [0:47] key6;
wire [0:47] key7;
wire [0:47] key8;
wire [0:47] key9;
wire [0:47] key10;
wire [0:47] key11;
wire [0:47] key12;
wire [0:47] key13;
wire [0:47] key14;
wire [0:47] key15;
wire [0:47] key16;
// register for left, right data blocks
reg [0:31] l;
reg [0:31] l0;
reg [0:31] l1;
reg [0:31] l2;
reg [0:31] l3;
reg [0:31] l4;
reg [0:31] l5;
reg [0:31] l6;
reg [0:31] l7;
reg [0:31] l8;
reg [0:31] l9;
reg [0:31] l10;
reg [0:31] l11;
reg [0:31] l12;
reg [0:31] l13;
reg [0:31] l14;
reg [0:31] l15;
reg [0:31] l16;
reg [0:31] r;
reg [0:31] r0;
reg [0:31] r1;
reg [0:31] r2;
reg [0:31] r3;
reg [0:31] r4;
reg [0:31] r5;
reg [0:31] r6;
reg [0:31] r7;
reg [0:31] r8;
reg [0:31] r9;
reg [0:31] r10;
reg [0:31] r11;
reg [0:31] r12;
reg [0:31] r13;
reg [0:31] r14;
reg [0:31] r15;
reg [0:31] r16;
wire valid_o = valid[18];
// valid, mode register
always @(posedge clk_i, negedge reset_i) begin
if(~reset_i) begin
valid <= 0;
mode <= 0;
end
else begin
// shift registers
valid[1:18] <= valid[0:17];
valid[0] <= valid_i;
mode[1:17] <= mode[0:16];
mode[0] <= mode_i;
end
end
// des algorithm pipeline
always @(posedge clk_i, negedge reset_i) begin
if(~reset_i) begin
l <= 0;
r <= 0;
l0 <= 0;
l1 <= 0;
l2 <= 0;
l3 <= 0;
l4 <= 0;
l5 <= 0;
l6 <= 0;
l7 <= 0;
l8 <= 0;
l9 <= 0;
l10 <= 0;
l11 <= 0;
l12 <= 0;
l13 <= 0;
l14 <= 0;
l15 <= 0;
l16 <= 0;
r0 <= 0;
r1 <= 0;
r2 <= 0;
r3 <= 0;
r4 <= 0;
r5 <= 0;
r6 <= 0;
r7 <= 0;
r8 <= 0;
r9 <= 0;
r10 <= 0;
r11 <= 0;
r12 <= 0;
r13 <= 0;
r14 <= 0;
r15 <= 0;
r16 <= 0;
data_o <= 0;
end
else begin
// output stage
data_o <= ipn({r16, l16});
// 16. stage
l16 <= r15;
r16 <= l15 ^ (f(r15, key16));
// 15. stage
l15 <= r14;
r15 <= l14 ^ (f(r14, key15));
// 14. stage
l14 <= r13;
r14 <= l13 ^ (f(r13, key14));
// 13. stage
l13 <= r12;
r13 <= l12 ^ (f(r12, key13));
// 12. stage
l12 <= r11;
r12 <= l11 ^ (f(r11, key12));
// 11. stage
l11 <= r10;
r11 <= l10 ^ (f(r10, key11));
// 10. stage
l10 <= r9;
r10 <= l9 ^ (f(r9, key10));
// 9. stage
l9 <= r8;
r9 <= l8 ^ (f(r8, key9));
// 8. stage
l8 <= r7;
r8 <= l7 ^ (f(r7, key8));
// 7. stage
l7 <= r6;
r7 <= l6 ^ (f(r6, key7));
// 6. stage
l6 <= r5;
r6 <= l5 ^ (f(r5, key6));
// 5. stage
l5 <= r4;
r5 <= l4 ^ (f(r4, key5));
// 4. stage
l4 <= r3;
r4 <= l3 ^ (f(r3, key4));
// 3. stage
l3 <= r2;
r3 <= l2 ^ (f(r2, key3));
// 2. stage
l2 <= r1;
r2 <= l1 ^ (f(r1, key2));
// 1. stage
l1 <= r0;
r1 <= l0 ^ (f(r0, key1));
// 1. state
l0 <= l;
r0 <= r;
// input stage
l <= ip0(data_i);
r <= ip1(data_i);
end
end
// des key pipeline
always @(posedge clk_i, negedge reset_i) begin
if(~reset_i) begin
c0 <= 0;
c1 <= 0;
c2 <= 0;
c3 <= 0;
c4 <= 0;
c5 <= 0;
c6 <= 0;
c7 <= 0;
c8 <= 0;
c9 <= 0;
c10 <= 0;
c11 <= 0;
c12 <= 0;
c13 <= 0;
c14 <= 0;
c15 <= 0;
c16 <= 0;
d0 <= 0;
d1 <= 0;
d2 <= 0;
d3 <= 0;
d4 <= 0;
d5 <= 0;
d6 <= 0;
d7 <= 0;
d8 <= 0;
d9 <= 0;
d10 <= 0;
d11 <= 0;
d12 <= 0;
d13 <= 0;
d14 <= 0;
d15 <= 0;
d16 <= 0;
end
else begin
// input stage
c0 <= pc1_c(key_i);
d0 <= pc1_d(key_i);
// 1st stage
if (~mode[0]) begin
c1 <= {c0[1:27], c0[0]};
d1 <= {d0[1:27], d0[0]};
end
else begin
c1 <= c0;
d1 <= d0;
end
// 2nd stage
if (~mode[1]) begin
c2 <= {c1[1:27], c1[0]};
d2 <= {d1[1:27], d1[0]};
end
else begin
c2 <= {c1[27], c1[0:26]};
d2 <= {d1[27], d1[0:26]};
end
// 3rd stage
if (~mode[2]) begin
c3 <= {c2[2:27], c2[0:1]};
d3 <= {d2[2:27], d2[0:1]};
end
else begin
c3 <= {c2[26:27], c2[0:25]};
d3 <= {d2[26:27], d2[0:25]};
end
// 4th stage
if (~mode[3]) begin
c4 <= {c3[2:27], c3[0:1]};
d4 <= {d3[2:27], d3[0:1]};
end
else begin
c4 <= {c3[26:27], c3[0:25]};
d4 <= {d3[26:27], d3[0:25]};
end
// 5th stage
if (~mode[4]) begin
c5 <= {c4[2:27], c4[0:1]};
d5 <= {d4[2:27], d4[0:1]};
end
else begin
c5 <= {c4[26:27], c4[0:25]};
d5 <= {d4[26:27], d4[0:25]};
end
// 6. stage
if (~mode[5]) begin
c6 <= {c5[2:27], c5[0:1]};
d6 <= {d5[2:27], d5[0:1]};
end
else begin
c6 <= {c5[26:27], c5[0:25]};
d6 <= {d5[26:27], d5[0:25]};
end
// 7. stage
if (~mode[6]) begin
c7 <= {c6[2:27], c6[0:1]};
d7 <= {d6[2:27], d6[0:1]};
end
else begin
c7 <= {c6[26:27], c6[0:25]};
d7 <= {d6[26:27], d6[0:25]};
end
// 8. stage
if (~mode[7]) begin
c8 <= {c7[2:27], c7[0:1]};
d8 <= {d7[2:27], d7[0:1]};
end
else begin
c8 <= {c7[26:27], c7[0:25]};
d8 <= {d7[26:27], d7[0:25]};
end
// 9. stage
if (~mode[8]) begin
c9 <= {c8[1:27], c8[0]};
d9 <= {d8[1:27], d8[0]};
end
else begin
c9 <= {c8[27], c8[0:26]};
d9 <= {d8[27], d8[0:26]};
end
// 10. stage
if (~mode[9]) begin
c10 <= {c9[2:27], c9[0:1]};
d10 <= {d9[2:27], d9[0:1]};
end
else begin
c10 <= {c9[26:27], c9[0:25]};
d10 <= {d9[26:27], d9[0:25]};
end
// 6. stage
if (~mode[10]) begin
c11 <= {c10[2:27], c10[0:1]};
d11 <= {d10[2:27], d10[0:1]};
end
else begin
c11 <= {c10[26:27], c10[0:25]};
d11 <= {d10[26:27], d10[0:25]};
end
// 6. stage
if (~mode[11]) begin
c12 <= {c11[2:27], c11[0:1]};
d12 <= {d11[2:27], d11[0:1]};
end
else begin
c12 <= {c11[26:27], c11[0:25]};
d12 <= {d11[26:27], d11[0:25]};
end
// 6. stage
if (~mode[12]) begin
c13 <= {c12[2:27], c12[0:1]};
d13 <= {d12[2:27], d12[0:1]};
end
else begin
c13 <= {c12[26:27], c12[0:25]};
d13 <= {d12[26:27], d12[0:25]};
end
// 6. stage
if (~mode[13]) begin
c14 <= {c13[2:27], c13[0:1]};
d14 <= {d13[2:27], d13[0:1]};
end
else begin
c14 <= {c13[26:27], c13[0:25]};
d14 <= {d13[26:27], d13[0:25]};
end
// 6. stage
if (~mode[14]) begin
c15 <= {c14[2:27], c14[0:1]};
d15 <= {d14[2:27], d14[0:1]};
end
else begin
c15 <= {c14[26:27], c14[0:25]};
d15 <= {d14[26:27], d14[0:25]};
end
// 6. stage
if (~mode[15]) begin
c16 <= {c15[1:27], c15[0]};
d16 <= {d15[1:27], d15[0]};
end
else begin
c16 <= {c15[27], c15[0:26]};
d16 <= {d15[27], d15[0:26]};
end
end
end
// key assignments
assign key1 = pc2({c1, d1});
assign key2 = pc2({c2, d2});
assign key3 = pc2({c3, d3});
assign key4 = pc2({c4, d4});
assign key5 = pc2({c5, d5});
assign key6 = pc2({c6, d6});
assign key7 = pc2({c7, d7});
assign key8 = pc2({c8, d8});
assign key9 = pc2({c9, d9});
assign key10 = pc2({c10, d10});
assign key11 = pc2({c11, d11});
assign key12 = pc2({c12, d12});
assign key13 = pc2({c13, d13});
assign key14 = pc2({c14, d14});
assign key15 = pc2({c15, d15});
assign key16 = pc2({c16, d16});
endmodule