//////////////////////////////////////////////////////////////////
|
//////////////////////////////////////////////////////////////////
|
////
|
////
|
////
|
////
|
//// AES CORE BLOCK
|
//// AES CORE BLOCK
|
////
|
////
|
////
|
////
|
////
|
////
|
//// This file is part of the APB to I2C project
|
//// This file is part of the APB to AES128 project
|
////
|
////
|
//// http://www.opencores.org/cores/apbi2c/
|
//// http://www.opencores.org/cores/apbtoaes128/
|
////
|
////
|
////
|
////
|
////
|
////
|
//// Description
|
//// Description
|
////
|
////
|
//// Implementation of APB IP core according to
|
//// Implementation of APB IP core according to
|
////
|
////
|
//// aes128_spec IP core specification document.
|
//// aes128_spec IP core specification document.
|
////
|
////
|
////
|
////
|
////
|
////
|
//// To Do: Things are right here but always all block can suffer changes
|
//// To Do: Things are right here but always all block can suffer changes
|
////
|
////
|
////
|
////
|
////
|
////
|
////
|
////
|
////
|
////
|
//// Author(s): - Felipe Fernandes Da Costa, fefe2560@gmail.com
|
//// Author(s): - Felipe Fernandes Da Costa, fefe2560@gmail.com
|
//// Julio Cesar
|
//// Julio Cesar
|
////
|
////
|
/////////////////////////////////////////////////////////////////
|
/////////////////////////////////////////////////////////////////
|
////
|
////
|
////
|
////
|
//// Copyright (C) 2009 Authors and OPENCORES.ORG
|
//// Copyright (C) 2009 Authors and OPENCORES.ORG
|
////
|
////
|
////
|
////
|
////
|
////
|
//// This source file may be used and distributed without
|
//// This source file may be used and distributed without
|
////
|
////
|
//// restriction provided that this copyright statement is not
|
//// restriction provided that this copyright statement is not
|
////
|
////
|
//// removed from the file and that any derivative work contains
|
//// removed from the file and that any derivative work contains
|
//// the original copyright notice and the associated disclaimer.
|
//// the original copyright notice and the associated disclaimer.
|
////
|
////
|
////
|
////
|
//// This source file is free software; you can redistribute it
|
//// This source file is free software; you can redistribute it
|
////
|
////
|
//// and/or modify it under the terms of the GNU Lesser General
|
//// and/or modify it under the terms of the GNU Lesser General
|
////
|
////
|
//// Public License as published by the Free Software Foundation;
|
//// Public License as published by the Free Software Foundation;
|
//// either version 2.1 of the License, or (at your option) any
|
//// either version 2.1 of the License, or (at your option) any
|
////
|
////
|
//// later version.
|
//// later version.
|
////
|
////
|
////
|
////
|
////
|
////
|
//// This source is distributed in the hope that it will be
|
//// This source is distributed in the hope that it will be
|
////
|
////
|
//// useful, but WITHOUT ANY WARRANTY; without even the implied
|
//// useful, but WITHOUT ANY WARRANTY; without even the implied
|
////
|
////
|
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
//// warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
|
////
|
////
|
//// PURPOSE. See the GNU Lesser General Public License for more
|
//// PURPOSE. See the GNU Lesser General Public License for more
|
//// details.
|
//// details.
|
////
|
////
|
////
|
////
|
////
|
////
|
//// You should have received a copy of the GNU Lesser General
|
//// You should have received a copy of the GNU Lesser General
|
////
|
////
|
//// Public License along with this source; if not, download it
|
//// Public License along with this source; if not, download it
|
////
|
////
|
//// from http://www.opencores.org/lgpl.shtml
|
//// from http://www.opencores.org/lgpl.shtml
|
////
|
////
|
////
|
////
|
///////////////////////////////////////////////////////////////////
|
///////////////////////////////////////////////////////////////////
|
module control_unit
|
module control_unit
|
(
|
(
|
output reg [ 2:0] sbox_sel,
|
output reg [ 2:0] sbox_sel,
|
output reg [ 1:0] rk_sel,
|
output reg [ 1:0] rk_sel,
|
output reg [ 1:0] key_out_sel,
|
output reg [ 1:0] key_out_sel,
|
output reg [ 1:0] col_sel,
|
output reg [ 1:0] col_sel,
|
output reg [ 3:0] key_en,
|
output reg [ 3:0] key_en,
|
output reg [ 3:0] col_en,
|
output reg [ 3:0] col_en,
|
output [ 3:0] round,
|
output [ 3:0] round,
|
output reg bypass_rk,
|
output reg bypass_rk,
|
output reg bypass_key_en,
|
output reg bypass_key_en,
|
output reg key_sel,
|
output reg key_sel,
|
output reg iv_cnt_en,
|
output reg iv_cnt_en,
|
output reg iv_cnt_sel,
|
output reg iv_cnt_sel,
|
output reg key_derivation_en,
|
output reg key_derivation_en,
|
output reg end_comp,
|
output reg end_comp,
|
output key_init,
|
output key_init,
|
output key_gen,
|
output key_gen,
|
output mode_ctr,
|
output mode_ctr,
|
output mode_cbc,
|
output mode_cbc,
|
output last_round,
|
output last_round,
|
output encrypt_decrypt,
|
output encrypt_decrypt,
|
input [1:0] operation_mode,
|
input [1:0] operation_mode,
|
input [1:0] aes_mode,
|
input [1:0] aes_mode,
|
input start,
|
input start,
|
input disable_core,
|
input disable_core,
|
input clk,
|
input clk,
|
input rst_n
|
input rst_n
|
);
|
);
|
//`include "include/host_interface.vh"
|
//`include "include/host_interface.vh"
|
//`include "include/control_unit_params.vh"
|
//`include "include/control_unit_params.vh"
|
|
|
//=====================================================================================
|
//=====================================================================================
|
// Memory Mapped Registers Address
|
// Memory Mapped Registers Address
|
//=====================================================================================
|
//=====================================================================================
|
localparam AES_CR = 4'd00;
|
localparam AES_CR = 4'd00;
|
localparam AES_SR = 4'd01;
|
localparam AES_SR = 4'd01;
|
localparam AES_DINR = 4'd02;
|
localparam AES_DINR = 4'd02;
|
localparam AES_DOUTR = 4'd03;
|
localparam AES_DOUTR = 4'd03;
|
localparam AES_KEYR0 = 4'd04;
|
localparam AES_KEYR0 = 4'd04;
|
localparam AES_KEYR1 = 4'd05;
|
localparam AES_KEYR1 = 4'd05;
|
localparam AES_KEYR2 = 4'd06;
|
localparam AES_KEYR2 = 4'd06;
|
localparam AES_KEYR3 = 4'd07;
|
localparam AES_KEYR3 = 4'd07;
|
localparam AES_IVR0 = 4'd08;
|
localparam AES_IVR0 = 4'd08;
|
localparam AES_IVR1 = 4'd09;
|
localparam AES_IVR1 = 4'd09;
|
localparam AES_IVR2 = 4'd10;
|
localparam AES_IVR2 = 4'd10;
|
localparam AES_IVR3 = 4'd11;
|
localparam AES_IVR3 = 4'd11;
|
|
|
//=============================================================================
|
//=============================================================================
|
// Operation Modes
|
// Operation Modes
|
//=============================================================================
|
//=============================================================================
|
localparam ENCRYPTION = 2'b00;
|
localparam ENCRYPTION = 2'b00;
|
localparam KEY_DERIVATION = 2'b01;
|
localparam KEY_DERIVATION = 2'b01;
|
localparam DECRYPTION = 2'b10;
|
localparam DECRYPTION = 2'b10;
|
localparam DECRYP_W_DERIV = 2'b11;
|
localparam DECRYP_W_DERIV = 2'b11;
|
|
|
//=============================================================================
|
//=============================================================================
|
// AES Modes
|
// AES Modes
|
//=============================================================================
|
//=============================================================================
|
localparam ECB = 2'b00;
|
localparam ECB = 2'b00;
|
localparam CBC = 2'b01;
|
localparam CBC = 2'b01;
|
localparam CTR = 2'b10;
|
localparam CTR = 2'b10;
|
|
|
//=============================================================================
|
//=============================================================================
|
// SBOX SEL
|
// SBOX SEL
|
//=============================================================================
|
//=============================================================================
|
localparam COL_0 = 3'b000;
|
localparam COL_0 = 3'b000;
|
localparam COL_1 = 3'b001;
|
localparam COL_1 = 3'b001;
|
localparam COL_2 = 3'b010;
|
localparam COL_2 = 3'b010;
|
localparam COL_3 = 3'b011;
|
localparam COL_3 = 3'b011;
|
localparam G_FUNCTION = 3'b100;
|
localparam G_FUNCTION = 3'b100;
|
|
|
//=============================================================================
|
//=============================================================================
|
// RK_SEL
|
// RK_SEL
|
//=============================================================================
|
//=============================================================================
|
localparam COL = 2'b00;
|
localparam COL = 2'b00;
|
localparam MIXCOL_IN = 2'b01;
|
localparam MIXCOL_IN = 2'b01;
|
localparam MIXCOL_OUT = 2'b10;
|
localparam MIXCOL_OUT = 2'b10;
|
|
|
//=============================================================================
|
//=============================================================================
|
// KEY_OUT_SEL
|
// KEY_OUT_SEL
|
//=============================================================================
|
//=============================================================================
|
localparam KEY_0 = 2'b00;
|
localparam KEY_0 = 2'b00;
|
localparam KEY_1 = 2'b01;
|
localparam KEY_1 = 2'b01;
|
localparam KEY_2 = 2'b10;
|
localparam KEY_2 = 2'b10;
|
localparam KEY_3 = 2'b11;
|
localparam KEY_3 = 2'b11;
|
|
|
//=============================================================================
|
//=============================================================================
|
// COL_SEL
|
// COL_SEL
|
//=============================================================================
|
//=============================================================================
|
localparam SHIFT_ROWS = 2'b00;
|
localparam SHIFT_ROWS = 2'b00;
|
localparam ADD_RK_OUT = 2'b01;
|
localparam ADD_RK_OUT = 2'b01;
|
localparam INPUT = 2'b10;
|
localparam INPUT = 2'b10;
|
|
|
//=============================================================================
|
//=============================================================================
|
// KEY_SEL
|
// KEY_SEL
|
//=============================================================================
|
//=============================================================================
|
localparam KEY_HOST = 1'b0;
|
localparam KEY_HOST = 1'b0;
|
localparam KEY_OUT = 1'b1;
|
localparam KEY_OUT = 1'b1;
|
|
|
//=============================================================================
|
//=============================================================================
|
// KEY_EN
|
// KEY_EN
|
//=============================================================================
|
//=============================================================================
|
localparam KEY_DIS = 4'b0000;
|
localparam KEY_DIS = 4'b0000;
|
localparam EN_KEY_0 = 4'b0001;
|
localparam EN_KEY_0 = 4'b0001;
|
localparam EN_KEY_1 = 4'b0010;
|
localparam EN_KEY_1 = 4'b0010;
|
localparam EN_KEY_2 = 4'b0100;
|
localparam EN_KEY_2 = 4'b0100;
|
localparam EN_KEY_3 = 4'b1000;
|
localparam EN_KEY_3 = 4'b1000;
|
localparam KEY_ALL = 4'b1111;
|
localparam KEY_ALL = 4'b1111;
|
|
|
//=============================================================================
|
//=============================================================================
|
// COL_EN
|
// COL_EN
|
//=============================================================================
|
//=============================================================================
|
localparam COL_DIS = 4'b0000;
|
localparam COL_DIS = 4'b0000;
|
localparam EN_COL_0 = 4'b0001;
|
localparam EN_COL_0 = 4'b0001;
|
localparam EN_COL_1 = 4'b0010;
|
localparam EN_COL_1 = 4'b0010;
|
localparam EN_COL_2 = 4'b0100;
|
localparam EN_COL_2 = 4'b0100;
|
localparam EN_COL_3 = 4'b1000;
|
localparam EN_COL_3 = 4'b1000;
|
localparam COL_ALL = 4'b1111;
|
localparam COL_ALL = 4'b1111;
|
|
|
//=============================================================================
|
//=============================================================================
|
// IV_CNT_SEL
|
// IV_CNT_SEL
|
//=============================================================================
|
//=============================================================================
|
localparam IV_CNT = 1'b1;
|
localparam IV_CNT = 1'b1;
|
localparam IV_BUS = 1'b0;
|
localparam IV_BUS = 1'b0;
|
|
|
//=============================================================================
|
//=============================================================================
|
// ENABLES
|
// ENABLES
|
//=============================================================================
|
//=============================================================================
|
localparam ENABLE = 1'b1;
|
localparam ENABLE = 1'b1;
|
localparam DISABLE = 1'b0;
|
localparam DISABLE = 1'b0;
|
|
|
localparam NUMBER_ROUND = 4'd10;
|
localparam NUMBER_ROUND = 4'd10;
|
localparam NUMBER_ROUND_INC = 4'd11;
|
localparam NUMBER_ROUND_INC = 4'd11;
|
localparam INITIAL_ROUND = 4'd00;
|
localparam INITIAL_ROUND = 4'd00;
|
|
|
//=============================================================================
|
//=============================================================================
|
// FSM STATES
|
// FSM STATES
|
//=============================================================================
|
//=============================================================================
|
localparam IDLE = 4'd00;
|
localparam IDLE = 4'd00;
|
localparam ROUND0_COL0 = 4'd01;
|
localparam ROUND0_COL0 = 4'd01;
|
localparam ROUND0_COL1 = 4'd02;
|
localparam ROUND0_COL1 = 4'd02;
|
localparam ROUND0_COL2 = 4'd03;
|
localparam ROUND0_COL2 = 4'd03;
|
localparam ROUND0_COL3 = 4'd04;
|
localparam ROUND0_COL3 = 4'd04;
|
localparam ROUND_KEY0 = 4'd05;
|
localparam ROUND_KEY0 = 4'd05;
|
localparam ROUND_COL0 = 4'd06;
|
localparam ROUND_COL0 = 4'd06;
|
localparam ROUND_COL1 = 4'd07;
|
localparam ROUND_COL1 = 4'd07;
|
localparam ROUND_COL2 = 4'd08;
|
localparam ROUND_COL2 = 4'd08;
|
localparam ROUND_COL3 = 4'd09;
|
localparam ROUND_COL3 = 4'd09;
|
localparam READY = 4'd10;
|
localparam READY = 4'd10;
|
localparam GEN_KEY0 = 4'd11;
|
localparam GEN_KEY0 = 4'd11;
|
localparam GEN_KEY1 = 4'd12;
|
localparam GEN_KEY1 = 4'd12;
|
localparam GEN_KEY2 = 4'd13;
|
localparam GEN_KEY2 = 4'd13;
|
localparam GEN_KEY3 = 4'd14;
|
localparam GEN_KEY3 = 4'd14;
|
localparam NOP = 4'd15;
|
localparam NOP = 4'd15;
|
|
|
reg [3:0] state, next_state;
|
reg [3:0] state, next_state;
|
reg [3:0] rd_count;
|
reg [3:0] rd_count;
|
|
|
reg rd_count_en;
|
reg rd_count_en;
|
wire op_key_derivation;
|
wire op_key_derivation;
|
wire first_round;
|
wire first_round;
|
wire [1:0] op_mode;
|
wire [1:0] op_mode;
|
|
|
// State Flops Definition
|
// State Flops Definition
|
always @(posedge clk, negedge rst_n)
|
always @(posedge clk, negedge rst_n)
|
begin
|
begin
|
if(!rst_n)
|
if(!rst_n)
|
state <= IDLE;
|
state <= IDLE;
|
else
|
else
|
if(disable_core)
|
if(disable_core)
|
state <= IDLE;
|
state <= IDLE;
|
else
|
else
|
state <= next_state;
|
state <= next_state;
|
end
|
end
|
|
|
assign encrypt_decrypt = (op_mode == ENCRYPTION || op_mode == KEY_DERIVATION ||
|
assign encrypt_decrypt = (op_mode == ENCRYPTION || op_mode == KEY_DERIVATION ||
|
state == GEN_KEY0 || state == GEN_KEY1 ||
|
state == GEN_KEY0 || state == GEN_KEY1 ||
|
state == GEN_KEY2 || state == GEN_KEY3 );
|
state == GEN_KEY2 || state == GEN_KEY3 );
|
|
|
assign enc_dec = encrypt_decrypt | mode_ctr;
|
assign enc_dec = encrypt_decrypt | mode_ctr;
|
assign key_gen = (state == ROUND_KEY0);
|
assign key_gen = (state == ROUND_KEY0);
|
|
|
assign op_key_derivation = (op_mode == KEY_DERIVATION);
|
assign op_key_derivation = (op_mode == KEY_DERIVATION);
|
|
|
assign mode_ctr = (aes_mode == CTR);
|
assign mode_ctr = (aes_mode == CTR);
|
assign mode_cbc = (aes_mode == CBC);
|
assign mode_cbc = (aes_mode == CBC);
|
|
|
assign key_init = start;
|
assign key_init = start;
|
|
|
assign op_mode = (mode_ctr) ? ENCRYPTION : operation_mode;
|
assign op_mode = (mode_ctr) ? ENCRYPTION : operation_mode;
|
|
|
// Next State Logic
|
// Next State Logic
|
always @(*)
|
always @(*)
|
begin
|
begin
|
next_state = state;
|
next_state = state;
|
case(state)
|
case(state)
|
IDLE:
|
IDLE:
|
begin
|
begin
|
if(!start)
|
if(!start)
|
next_state = IDLE;
|
next_state = IDLE;
|
else
|
else
|
case(op_mode)
|
case(op_mode)
|
ENCRYPTION : next_state = ROUND0_COL0;
|
ENCRYPTION : next_state = ROUND0_COL0;
|
DECRYPTION : next_state = ROUND0_COL3;
|
DECRYPTION : next_state = ROUND0_COL3;
|
KEY_DERIVATION: next_state = GEN_KEY0;
|
KEY_DERIVATION: next_state = GEN_KEY0;
|
DECRYP_W_DERIV: next_state = GEN_KEY0;
|
DECRYP_W_DERIV: next_state = GEN_KEY0;
|
default : next_state = IDLE;
|
default : next_state = IDLE;
|
endcase
|
endcase
|
end
|
end
|
ROUND0_COL0:
|
ROUND0_COL0:
|
begin
|
begin
|
next_state = (enc_dec) ? ROUND0_COL1 : ROUND_KEY0;
|
next_state = (enc_dec) ? ROUND0_COL1 : ROUND_KEY0;
|
end
|
end
|
ROUND0_COL1:
|
ROUND0_COL1:
|
begin
|
begin
|
next_state = (enc_dec) ? ROUND0_COL2 : ROUND0_COL0;
|
next_state = (enc_dec) ? ROUND0_COL2 : ROUND0_COL0;
|
end
|
end
|
ROUND0_COL2:
|
ROUND0_COL2:
|
begin
|
begin
|
next_state = (enc_dec) ? ROUND0_COL3 : ROUND0_COL1;
|
next_state = (enc_dec) ? ROUND0_COL3 : ROUND0_COL1;
|
end
|
end
|
ROUND0_COL3:
|
ROUND0_COL3:
|
begin
|
begin
|
next_state = (enc_dec) ? ROUND_KEY0 : ROUND0_COL2;
|
next_state = (enc_dec) ? ROUND_KEY0 : ROUND0_COL2;
|
end
|
end
|
ROUND_KEY0 :
|
ROUND_KEY0 :
|
begin
|
begin
|
if(!first_round)
|
if(!first_round)
|
begin
|
begin
|
next_state = (last_round) ? READY : NOP;
|
next_state = (last_round) ? READY : NOP;
|
end
|
end
|
else
|
else
|
begin
|
begin
|
next_state = (enc_dec) ? ROUND_COL0 : ROUND_COL3;
|
next_state = (enc_dec) ? ROUND_COL0 : ROUND_COL3;
|
end
|
end
|
end
|
end
|
NOP :
|
NOP :
|
begin
|
begin
|
next_state = (enc_dec) ? ROUND_COL0 : ROUND_COL3;
|
next_state = (enc_dec) ? ROUND_COL0 : ROUND_COL3;
|
end
|
end
|
ROUND_COL0 :
|
ROUND_COL0 :
|
begin
|
begin
|
next_state = (enc_dec) ? ROUND_COL1 : ROUND_KEY0;
|
next_state = (enc_dec) ? ROUND_COL1 : ROUND_KEY0;
|
end
|
end
|
ROUND_COL1 :
|
ROUND_COL1 :
|
begin
|
begin
|
next_state = (enc_dec) ? ROUND_COL2 : ROUND_COL0;
|
next_state = (enc_dec) ? ROUND_COL2 : ROUND_COL0;
|
end
|
end
|
ROUND_COL2 :
|
ROUND_COL2 :
|
begin
|
begin
|
next_state = (enc_dec) ? ROUND_COL3 : ROUND_COL1;
|
next_state = (enc_dec) ? ROUND_COL3 : ROUND_COL1;
|
end
|
end
|
ROUND_COL3 :
|
ROUND_COL3 :
|
begin
|
begin
|
if(last_round && enc_dec)
|
if(last_round && enc_dec)
|
next_state = READY;
|
next_state = READY;
|
else
|
else
|
next_state = (enc_dec) ? ROUND_KEY0 : ROUND_COL2;
|
next_state = (enc_dec) ? ROUND_KEY0 : ROUND_COL2;
|
end
|
end
|
GEN_KEY0 :
|
GEN_KEY0 :
|
begin
|
begin
|
next_state = GEN_KEY1;
|
next_state = GEN_KEY1;
|
end
|
end
|
GEN_KEY1 :
|
GEN_KEY1 :
|
begin
|
begin
|
next_state = GEN_KEY2;
|
next_state = GEN_KEY2;
|
end
|
end
|
GEN_KEY2 :
|
GEN_KEY2 :
|
begin
|
begin
|
next_state = GEN_KEY3;
|
next_state = GEN_KEY3;
|
end
|
end
|
GEN_KEY3 :
|
GEN_KEY3 :
|
begin
|
begin
|
if(last_round)
|
if(last_round)
|
next_state = (op_key_derivation) ? READY : ROUND0_COL3;
|
next_state = (op_key_derivation) ? READY : ROUND0_COL3;
|
else
|
else
|
next_state = GEN_KEY0;
|
next_state = GEN_KEY0;
|
end
|
end
|
READY :
|
READY :
|
begin
|
begin
|
next_state = IDLE;
|
next_state = IDLE;
|
end
|
end
|
endcase
|
endcase
|
end
|
end
|
|
|
|
|
// Output Logic
|
// Output Logic
|
always @(*)
|
always @(*)
|
begin
|
begin
|
sbox_sel = COL_0;
|
sbox_sel = COL_0;
|
rk_sel = COL;
|
rk_sel = COL;
|
bypass_rk = DISABLE;
|
bypass_rk = DISABLE;
|
key_out_sel = KEY_0;
|
key_out_sel = KEY_0;
|
col_sel = INPUT;
|
col_sel = INPUT;
|
key_sel = KEY_HOST;
|
key_sel = KEY_HOST;
|
key_en = KEY_DIS;
|
key_en = KEY_DIS;
|
col_en = COL_DIS;
|
col_en = COL_DIS;
|
rd_count_en = DISABLE;
|
rd_count_en = DISABLE;
|
iv_cnt_en = DISABLE;
|
iv_cnt_en = DISABLE;
|
iv_cnt_sel = IV_BUS;
|
iv_cnt_sel = IV_BUS;
|
bypass_key_en = DISABLE;
|
bypass_key_en = DISABLE;
|
key_derivation_en = DISABLE;
|
key_derivation_en = DISABLE;
|
end_comp = DISABLE;
|
end_comp = DISABLE;
|
case(state)
|
case(state)
|
ROUND0_COL0:
|
ROUND0_COL0:
|
begin
|
begin
|
sbox_sel = COL_0;
|
sbox_sel = COL_0;
|
rk_sel = COL;
|
rk_sel = COL;
|
bypass_rk = ENABLE;
|
bypass_rk = ENABLE;
|
bypass_key_en = ENABLE;
|
bypass_key_en = ENABLE;
|
key_out_sel = KEY_0;
|
key_out_sel = KEY_0;
|
col_sel = (enc_dec) ? ADD_RK_OUT : SHIFT_ROWS;
|
col_sel = (enc_dec) ? ADD_RK_OUT : SHIFT_ROWS;
|
col_en = (enc_dec) ? EN_COL_0 : COL_ALL;
|
col_en = (enc_dec) ? EN_COL_0 : COL_ALL;
|
end
|
end
|
ROUND0_COL1:
|
ROUND0_COL1:
|
begin
|
begin
|
sbox_sel = COL_1;
|
sbox_sel = COL_1;
|
rk_sel = COL;
|
rk_sel = COL;
|
bypass_rk = ENABLE;
|
bypass_rk = ENABLE;
|
bypass_key_en = ENABLE;
|
bypass_key_en = ENABLE;
|
key_out_sel = KEY_1;
|
key_out_sel = KEY_1;
|
col_sel = ADD_RK_OUT;
|
col_sel = ADD_RK_OUT;
|
col_en = EN_COL_1;
|
col_en = EN_COL_1;
|
if(!enc_dec)
|
if(!enc_dec)
|
begin
|
begin
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
key_en = EN_KEY_1;
|
key_en = EN_KEY_1;
|
end
|
end
|
end
|
end
|
ROUND0_COL2:
|
ROUND0_COL2:
|
begin
|
begin
|
sbox_sel = COL_2;
|
sbox_sel = COL_2;
|
rk_sel = COL;
|
rk_sel = COL;
|
bypass_rk = ENABLE;
|
bypass_rk = ENABLE;
|
bypass_key_en = ENABLE;
|
bypass_key_en = ENABLE;
|
key_out_sel = KEY_2;
|
key_out_sel = KEY_2;
|
col_sel = ADD_RK_OUT;
|
col_sel = ADD_RK_OUT;
|
col_en = EN_COL_2;
|
col_en = EN_COL_2;
|
if(!enc_dec)
|
if(!enc_dec)
|
begin
|
begin
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
key_en = EN_KEY_2;
|
key_en = EN_KEY_2;
|
end
|
end
|
end
|
end
|
ROUND0_COL3:
|
ROUND0_COL3:
|
begin
|
begin
|
sbox_sel = COL_3;
|
sbox_sel = COL_3;
|
rk_sel = COL;
|
rk_sel = COL;
|
bypass_key_en = ENABLE;
|
bypass_key_en = ENABLE;
|
key_out_sel = KEY_3;
|
key_out_sel = KEY_3;
|
col_sel = (enc_dec) ? SHIFT_ROWS : ADD_RK_OUT;
|
col_sel = (enc_dec) ? SHIFT_ROWS : ADD_RK_OUT;
|
col_en = (enc_dec) ? COL_ALL : EN_COL_3;
|
col_en = (enc_dec) ? COL_ALL : EN_COL_3;
|
bypass_rk = ENABLE;
|
bypass_rk = ENABLE;
|
if(!enc_dec)
|
if(!enc_dec)
|
begin
|
begin
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
key_en = EN_KEY_3;
|
key_en = EN_KEY_3;
|
end
|
end
|
end
|
end
|
ROUND_KEY0:
|
ROUND_KEY0:
|
begin
|
begin
|
sbox_sel = G_FUNCTION;
|
sbox_sel = G_FUNCTION;
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
key_en = EN_KEY_0;
|
key_en = EN_KEY_0;
|
rd_count_en = ENABLE;
|
rd_count_en = ENABLE;
|
end
|
end
|
ROUND_COL0:
|
ROUND_COL0:
|
begin
|
begin
|
sbox_sel = COL_0;
|
sbox_sel = COL_0;
|
rk_sel = (last_round) ? MIXCOL_IN : MIXCOL_OUT;
|
rk_sel = (last_round) ? MIXCOL_IN : MIXCOL_OUT;
|
key_out_sel = KEY_0;
|
key_out_sel = KEY_0;
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
if(enc_dec)
|
if(enc_dec)
|
key_en = EN_KEY_1;
|
key_en = EN_KEY_1;
|
if((mode_cbc && last_round && !enc_dec) || (mode_ctr && last_round))
|
if((mode_cbc && last_round && !enc_dec) || (mode_ctr && last_round))
|
col_sel = INPUT;
|
col_sel = INPUT;
|
else
|
else
|
begin
|
begin
|
if(!enc_dec)
|
if(!enc_dec)
|
col_sel = (last_round) ? ADD_RK_OUT : SHIFT_ROWS;
|
col_sel = (last_round) ? ADD_RK_OUT : SHIFT_ROWS;
|
else
|
else
|
col_sel = ADD_RK_OUT;
|
col_sel = ADD_RK_OUT;
|
end
|
end
|
if(enc_dec)
|
if(enc_dec)
|
col_en = EN_COL_0;
|
col_en = EN_COL_0;
|
else
|
else
|
col_en = (last_round) ? EN_COL_0 : COL_ALL;
|
col_en = (last_round) ? EN_COL_0 : COL_ALL;
|
end
|
end
|
ROUND_COL1:
|
ROUND_COL1:
|
begin
|
begin
|
sbox_sel = COL_1;
|
sbox_sel = COL_1;
|
rk_sel = (last_round) ? MIXCOL_IN : MIXCOL_OUT;
|
rk_sel = (last_round) ? MIXCOL_IN : MIXCOL_OUT;
|
key_out_sel = KEY_1;
|
key_out_sel = KEY_1;
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
if(enc_dec)
|
if(enc_dec)
|
key_en = EN_KEY_2;
|
key_en = EN_KEY_2;
|
else
|
else
|
key_en = EN_KEY_1;
|
key_en = EN_KEY_1;
|
if((mode_cbc && last_round && !enc_dec) || (mode_ctr && last_round))
|
if((mode_cbc && last_round && !enc_dec) || (mode_ctr && last_round))
|
col_sel = INPUT;
|
col_sel = INPUT;
|
else
|
else
|
col_sel = ADD_RK_OUT;
|
col_sel = ADD_RK_OUT;
|
col_en = EN_COL_1;
|
col_en = EN_COL_1;
|
end
|
end
|
ROUND_COL2:
|
ROUND_COL2:
|
begin
|
begin
|
sbox_sel = COL_2;
|
sbox_sel = COL_2;
|
rk_sel = (last_round) ? MIXCOL_IN : MIXCOL_OUT;
|
rk_sel = (last_round) ? MIXCOL_IN : MIXCOL_OUT;
|
key_out_sel = KEY_2;
|
key_out_sel = KEY_2;
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
if(enc_dec)
|
if(enc_dec)
|
key_en = EN_KEY_3;
|
key_en = EN_KEY_3;
|
else
|
else
|
key_en = EN_KEY_2;
|
key_en = EN_KEY_2;
|
if((mode_cbc && last_round && !enc_dec) || (mode_ctr && last_round))
|
if((mode_cbc && last_round && !enc_dec) || (mode_ctr && last_round))
|
col_sel = INPUT;
|
col_sel = INPUT;
|
else
|
else
|
col_sel = ADD_RK_OUT;
|
col_sel = ADD_RK_OUT;
|
col_en = EN_COL_2;
|
col_en = EN_COL_2;
|
end
|
end
|
ROUND_COL3:
|
ROUND_COL3:
|
begin
|
begin
|
sbox_sel = COL_3;
|
sbox_sel = COL_3;
|
rk_sel = (last_round) ? MIXCOL_IN : MIXCOL_OUT;
|
rk_sel = (last_round) ? MIXCOL_IN : MIXCOL_OUT;
|
key_out_sel = KEY_3;
|
key_out_sel = KEY_3;
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
if(!enc_dec)
|
if(!enc_dec)
|
key_en = EN_KEY_3;
|
key_en = EN_KEY_3;
|
if((mode_cbc && last_round && !enc_dec) || (mode_ctr && last_round))
|
if((mode_cbc && last_round && !enc_dec) || (mode_ctr && last_round))
|
col_sel = INPUT;
|
col_sel = INPUT;
|
else
|
else
|
begin
|
begin
|
if(enc_dec)
|
if(enc_dec)
|
col_sel = (last_round) ? ADD_RK_OUT : SHIFT_ROWS;
|
col_sel = (last_round) ? ADD_RK_OUT : SHIFT_ROWS;
|
else
|
else
|
col_sel = ADD_RK_OUT;
|
col_sel = ADD_RK_OUT;
|
end
|
end
|
if(enc_dec)
|
if(enc_dec)
|
col_en = (last_round) ? EN_COL_3 : COL_ALL;
|
col_en = (last_round) ? EN_COL_3 : COL_ALL;
|
else
|
else
|
col_en = EN_COL_3;
|
col_en = EN_COL_3;
|
if(mode_ctr && last_round)
|
if(mode_ctr && last_round)
|
begin
|
begin
|
iv_cnt_en = ENABLE;
|
iv_cnt_en = ENABLE;
|
iv_cnt_sel = IV_CNT;
|
iv_cnt_sel = IV_CNT;
|
end
|
end
|
end
|
end
|
GEN_KEY0:
|
GEN_KEY0:
|
begin
|
begin
|
sbox_sel = G_FUNCTION;
|
sbox_sel = G_FUNCTION;
|
rd_count_en = ENABLE;
|
rd_count_en = ENABLE;
|
end
|
end
|
GEN_KEY1:
|
GEN_KEY1:
|
begin
|
begin
|
key_en = EN_KEY_1 | EN_KEY_0; //Enable key 0 AND key 1
|
key_en = EN_KEY_1 | EN_KEY_0; //Enable key 0 AND key 1
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
bypass_key_en = ENABLE;
|
bypass_key_en = ENABLE;
|
end
|
end
|
GEN_KEY2:
|
GEN_KEY2:
|
begin
|
begin
|
key_en = EN_KEY_2;
|
key_en = EN_KEY_2;
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
bypass_key_en = ENABLE;
|
bypass_key_en = ENABLE;
|
end
|
end
|
GEN_KEY3:
|
GEN_KEY3:
|
begin
|
begin
|
key_en = EN_KEY_3;
|
key_en = EN_KEY_3;
|
key_sel = KEY_OUT;
|
key_sel = KEY_OUT;
|
bypass_key_en = ENABLE;
|
bypass_key_en = ENABLE;
|
end
|
end
|
READY:
|
READY:
|
begin
|
begin
|
end_comp = ENABLE;
|
end_comp = ENABLE;
|
if(op_mode == KEY_DERIVATION)
|
if(op_mode == KEY_DERIVATION)
|
key_derivation_en = ENABLE;
|
key_derivation_en = ENABLE;
|
end
|
end
|
endcase
|
endcase
|
end
|
end
|
|
|
// Round Counter
|
// Round Counter
|
always @(posedge clk, negedge rst_n)
|
always @(posedge clk, negedge rst_n)
|
begin
|
begin
|
if(!rst_n)
|
if(!rst_n)
|
rd_count <= INITIAL_ROUND;
|
rd_count <= INITIAL_ROUND;
|
else
|
else
|
if(state == IDLE || (state == GEN_KEY3 && last_round))
|
if(state == IDLE || (state == GEN_KEY3 && last_round))
|
rd_count <= INITIAL_ROUND;
|
rd_count <= INITIAL_ROUND;
|
else
|
else
|
if(rd_count_en)
|
if(rd_count_en)
|
rd_count <= rd_count + 1'b1;
|
rd_count <= rd_count + 1'b1;
|
end
|
end
|
|
|
assign round = rd_count;
|
assign round = rd_count;
|
assign first_round = (rd_count == INITIAL_ROUND);
|
assign first_round = (rd_count == INITIAL_ROUND);
|
assign last_round = (rd_count == NUMBER_ROUND || rd_count == NUMBER_ROUND_INC);
|
assign last_round = (rd_count == NUMBER_ROUND || rd_count == NUMBER_ROUND_INC);
|
|
|
endmodule
|
endmodule
|
|
|
