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📄 3des部分代码.txt

📁 本人从老师那里找到的3DES的算法的源代码
💻 TXT
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module  lun(clk,reset,en,datain,keyin,dataout);

	input clk,reset,en;
	input [64:1]datain;
	input [48:1]keyin;
	output[64:0]dataout;
	
	wire [48:1]b;
	reg[32:1]c;
	reg[64:1] dataout;

	ezihuan e(datain[32:1],keyin,b)
	
	always@(posedge clk or posedge reset)
	begin
		if(reset) begin
			     dataout<=64'b0;
		            end

		else if(en)
			begin
				dataout<={datain[32:1],{ c[25],c[4],c[11],c[22],c[6],c[30],c[13],c[19],
						         c[9],c[3],c[27],c[32],c[14],c[24],c[8],c[2],
						         c[10],c[31],c[18],c[5],c[26],c[23],c[15],c[1],
					                       c[17],c[28],c[12],c[29],c[21],c20],c[7],c[16]}^
						         datain[64:33]};
			end	
	end




always
begin
 	case({b[6],b[1]}) /*第一个S盒*/
	2'd0:
		case({b[5],b[4],b[3],b[2]})
		4'd0:c[4:1]<=14;
		4'd1:c[4:1]<=4;
		4'd2:c[4:1]<=13;
		4'd3:c[4:1]<=1;
		4'd4:c[4:1]<=2;
		4'd5:c[4:1]<=15;
		4'd6:c[4:1]<=11;
		4'd7:c[4:1]<=8;
		4'd8:c[4:1]<=3;
		4'd9:c[4:1]<=10;
		4'd10:c[4:1]<=6;
		4'd11:c[4:1]<=12;
		4'd12:c[4:1]<=5;
		4'd13:c[4:1]<=9;
		4'd14:c[4:1]<=0;
		4'd15:c[4:1]<=7;
		default:c[4:1]<=0;
		endcase


	2'd1:
		case({b[5],b[4],b[3],b[2]})
		4'd0:c[4:1]<=0;
		4'd1:c[4:1]<=15;
		4'd2:c[4:1]<=7;
		4'd3:c[4:1]<=4;
		4'd4:c[4:1]<=14;
		4'd5:c[4:1]<=2;
		4'd6:c[4:1]<=13;
		4'd7:c[4:1]<=1;
		4'd8:c[4:1]<=10;
		4'd9:c[4:1]<=6;
		4'd10:c[4:1]<=12;
		4'd11:c[4:1]<=11;
		4'd12:c[4:1]<=9;
		4'd13:c[4:1]<=5;
		4'd14:c[4:1]<=3;
		4'd15:c[4:1]<=8;
		default:c[4:1]<=0;
		endcase


	2'd2:
		case({b[5],b[4],b[3],b[2]})
		4'd0:c[4:1]<=4;
		4'd1:c[4:1]<=1;
		4'd2:c[4:1]<=14;
		4'd3:c[4:1]<=8;
		4'd4:c[4:1]<=13;
		4'd5:c[4:1]<=6;
		4'd6:c[4:1]<=2;
		4'd7:c[4:1]<=11;
		4'd8:c[4:1]<=15;
		4'd9:c[4:1]<=12;
		4'd10:c[4:1]<=9;
		4'd11:c[4:1]<=7;
		4'd12:c[4:1]<=3;
		4'd13:c[4:1]<=10;
		4'd14:c[4:1]<=5;
		4'd15:c[4:1]<=0;
		default:c[4:1]<=0;
		endcase


	2'd3:
		case({b[5],b[4],b[3],b[2]})
		4'd0:c[4:1]<=15;
		4'd1:c[4:1]<=12;
		4'd2:c[4:1]<=8;
		4'd3:c[4:1]<=2;
		4'd4:c[4:1]<=4;
		4'd5:c[4:1]<=9;
		4'd6:c[4:1]<=1;
		4'd7:c[4:1]<=7;
		4'd8:c[4:1]<=5;
		4'd9:c[4:1]<=11;
		4'd10:c[4:1]<=3;
		4'd11:c[4:1]<=14;
		4'd12:c[4:1]<=10;
		4'd13:c[4:1]<=0;
		4'd14:c[4:1]<=6;
		4'd15:c[4:1]<=13;
		default:c[4:1]<=0;
		endcase
	default:c[4:1]<0;
	endcase


	case({b[12],b[7]}) /*第二个S盒*/
	2'd0:
		case({b[11],b[10],b[9],b[8]})	
		4'd0:c[8:5]<=15;
		4'd1:c[8:5]<=1;
		4'd2:c[8:5]<=8;
		4'd3:c[8:5]<=14;
		4'd4:c[8:5]<=16;
		4'd5:c[8:5]<=11;
		4'd6:c[8:5]<=3;
		4'd7:c[8:5]<=4;
		4'd8:c[8:5]<=9;
		4'd9:c[8:5]<=7;
		4'd10:c[8:5]<=2;
		4'd11:c[8:5]<=13;
		4'd12:c[8:5]<=12;
		4'd13:c[8:5]<=0;
		4'd14:c[8:5]<=5;
		4'd15:c[8:5]<=10;
		default:c[8:5]<=0;
		endcase

	2'd1:
		case({b[11],b[10],b[9],b[8]})	
		4'd0:c[8:5]<=3;
		4'd1:c[8:5]<=13;
		4'd2:c[8:5]<=4;
		4'd3:c[8:5]<=7;
		4'd4:c[8:5]<=15;
		4'd5:c[8:5]<=2;
		4'd6:c[8:5]<=8;
		4'd7:c[8:5]<=14;
		4'd8:c[8:5]<=12;
		4'd9:c[8:5]<=0;
		4'd10:c[8:5]<=1;
		4'd11:c[8:5]<=10;
		4'd12:c[8:5]<=6;
		4'd13:c[8:5]<=9;
		4'd14:c[8:5]<=11;
		4'd15:c[8:5]<=5;
		default:c[8:5]<=0;
		endcase


	2'd2:
		case({b[11],b[10],b[9],b[8]})	
		4'd0:c[8:5]<=0;
		4'd1:c[8:5]<=14;
		4'd2:c[8:5]<=7;
		4'd3:c[8:5]<=11;
		4'd4:c[8:5]<=10;
		4'd5:c[8:5]<=4;
		4'd6:c[8:5]<=13;
		4'd7:c[8:5]<=1;
		4'd8:c[8:5]<=5;
		4'd9:c[8:5]<=8;
		4'd10:c[8:5]<=12;
		4'd11:c[8:5]<=6;
		4'd12:c[8:5]<=9;
		4'd13:c[8:5]<=3;
		4'd14:c[8:5]<=2;
		4'd15:c[8:5]<=15;
		default:c[8:5]<=0;
		endcase

	2'd3:
		case({b[11],b[10],b[9],b[8]})	
		4'd0:c[8:5]<=13;
		4'd1:c[8:5]<=8;
		4'd2:c[8:5]<=10;
		4'd3:c[8:5]<=1;
		4'd4:c[8:5]<=3;
		4'd5:c[8:5]<=15;
		4'd6:c[8:5]<=4;
		4'd7:c[8:5]<=2;
		4'd8:c[8:5]<=11;
		4'd9:c[8:5]<=6;
		4'd10:c[8:5]<=7;
		4'd11:c[8:5]<=12;
		4'd12:c[8:5]<=0;
		4'd13:c[8:5]<=5;
		4'd14:c[8:5]<=14;
		4'd15:c[8:5]<=9;
		default:c[8:5]<=0;
		endcase
	default :c[8:5]<=0;
	endcase


	case({b[18],b[13]})/*第三个S盒*/
	2'd0:
		case({b[17],b[16],b[15],b[14]})
		4'd0:c[12:9]<=10;
		4'd1:c[12:9]<=0;
		4'd2:c[12:9]<=9;
		4'd3:c[12:9]<=14;
		4'd4:c[12:9]<=6;
		4'd5:c[12:9]<=3;
		4'd6:c[12:9]<=15;
		4'd7:c[12:9]<=5;
		4'd8:c[12:9]<=1;
		4'd9:c[12:9]<=13;
		4'd10:c[12:9]<=12;
		4'd11:c[12:9]<=7;
		4'd12:c[12:9]<=11;
		4'd13:c[12:9]<=4;
		4'd14:c[12:9]<=2;
		4'd15:c[12:9]<=8;
		default:c[12:9]<=0;
		endcase






	2'd1:
		case({b[17],b[16],b[15],b[14]})
		4'd0:c[12:9]<=13;
		4'd1:c[12:9]<=7;
		4'd2:c[12:9]<=0;
		4'd3:c[12:9]<=9;
		4'd4:c[12:9]<=3;
		4'd5:c[12:9]<=4;
		4'd6:c[12:9]<=6;
		4'd7:c[12:9]<=10;
		4'd8:c[12:9]<=2;
		4'd9:c[12:9]<=8;
		4'd10:c[12:9]<=5;
		4'd11:c[12:9]<=14;
		4'd12:c[12:9]<=12;
		4'd13:c[12:9]<=11;
		4'd14:c[12:9]<=15;
		4'd15:c[12:9]<=1;
		default:c[12:9]<=0;
		endcase



	2'd2:
		case({b[17],b[16],b[15],b[14]})
		4'd0:c[12:9]<=13;
		4'd1:c[12:9]<=6;
		4'd2:c[12:9]<=4;
		4'd3:c[12:9]<=9;
		4'd4:c[12:9]<=8;
		4'd5:c[12:9]<=15;
		4'd6:c[12:9]<=3;
		4'd7:c[12:9]<=0;
		4'd8:c[12:9]<=11;
		4'd9:c[12:9]<=1;
		4'd10:c[12:9]<=2;
		4'd11:c[12:9]<=12;
		4'd12:c[12:9]<=5;
		4'd13:c[12:9]<=10;
		4'd14:c[12:9]<=14;
		4'd15:c[12:9]<=7;
		default:c[12:9]<=0;
		endcase


	2'd3:
		case({b[17],b[16],b[15],b[14]})
		4'd0:c[12:9]<=1;
		4'd1:c[12:9]<=10;
		4'd2:c[12:9]<=13;
		4'd3:c[12:9]<=0;
		4'd4:c[12:9]<=6;
		4'd5:c[12:9]<=9;
		4'd6:c[12:9]<=8;
		4'd7:c[12:9]<=7;
		4'd8:c[12:9]<=4;
		4'd9:c[12:9]<=15;
		4'd10:c[12:9]<=14;
		4'd11:c[12:9]<=3;
		4'd12:c[12:9]<=11;
		4'd13:c[12:9]<=5;
		4'd14:c[12:9]<=2;
		4'd15:c[12:9]<=12;
		default:c[12:9]<=0;
		endcase
	default:c[12:9]<=0;
	endcase



	case({b[24],b[19]})/*第四个盒*/
	2'd0:
		case({b[23],b[22],b[21],b[20]})
		4'd0:c[16:13]<=7;
		4'd1:c[16:13]<=13;
		4'd2:c[16:13]<=14;
		4'd3:c[16:13]<=3;
		4'd4:c[16:13]<=0;
		4'd5:c[16:13]<=6;
		4'd6:c[16:13]<=9;
		4'd7:c[16:13]<=10;
		4'd8:c[16:13]<=1;
		4'd9:c[16:13]<=2;
		4'd10:c[16:13]<=8;
		4'd11:c[16:13]<=5;
		4'd12:c[16:13]<=11;
		4'd13:c[16:13]<=12;
		4'd14:c[16:13]<=4;
		4'd15:c[16:13]<=15;
		default:c[16:13]<=0;
		endcase


	2'd1:
		case({b[23],b[22],b[21],b[20]})
		4'd0:c[16:13]<=13;
		4'd1:c[16:13]<=8;
		4'd2:c[16:13]<=11;
		4'd3:c[16:13]<=5;
		4'd4:c[16:13]<=6;
		4'd5:c[16:13]<=15;
		4'd6:c[16:13]<=0;
		4'd7:c[16:13]<=3;
		4'd8:c[16:13]<=4;
		4'd9:c[16:13]<=7;
		4'd10:c[16:13]<=2;
		4'd11:c[16:13]<=12;
		4'd12:c[16:13]<=1;
		4'd13:c[16:13]<=10;
		4'd14:c[16:13]<=14;
		4'd15:c[16:13]<=9;
		default:c[16:13]<=0;
		endcase
	2'd2:
		case({b[23],b[22],b[21],b[20]})
		4'd0:c[16:13]<=10;
		4'd1:c[16:13]<=6;
		4'd2:c[16:13]<=9;
		4'd3:c[16:13]<=0;
		4'd4:c[16:13]<=12;
		4'd5:c[16:13]<=11;
		4'd6:c[16:13]<=7;
		4'd7:c[16:13]<=13;
		4'd8:c[16:13]<=15;
		4'd9:c[16:13]<=1;
		4'd10:c[16:13]<=3;
		4'd11:c[16:13]<=14;
		4'd12:c[16:13]<=5;
		4'd13:c[16:13]<=2;
		4'd14:c[16:13]<=8;
		4'd15:c[16:13]<=4;
		default:c[16:13]<=0;
		endcase

	2'd3:
		case({b[23],b[22],b[21],b[20]})
		4'd0:c[16:13]<=3;
		4'd1:c[16:13]<=15;
		4'd2:c[16:13]<=0;
		4'd3:c[16:13]<=6;
		4'd4:c[16:13]<=10;
		4'd5:c[16:13]<=1;
		4'd6:c[16:13]<=13;
		4'd7:c[16:13]<=8;
		4'd8:c[16:13]<=9;
		4'd9:c[16:13]<=4;
		4'd10:c[16:13]<=5;
		4'd11:c[16:13]<=11;
		4'd12:c[16:13]<=12;
		4'd13:c[16:13]<=7;
		4'd14:c[16:13]<=2;
		4'd15:c[16:13]<=14;
		default:c[16:13]<=0;
		endcase
	default:c[16:13]<=0;
	endcase

	case({b[30],b[25]})/*第六个S盒*/
	2'd0:
		case({b[29],b[28],b[27],b[26]})
		4'd0:c[20:17]<=2;
		4'd1:c[20:17]<=12;
		4'd2:c[20:17]<=4;
		4'd3:c[20:17]<=1;
		4'd4:c[20:17]<=7;
		4'd5:c[20:17]<=10;
		4'd6:c[20:17]<=11;
		4'd7:c[20:17]<=6;
		4'd8:c[20:17]<=8;
		4'd9:c[20:17]<=5;
		4'd10:c[20:17]<=3;
		4'd11:c[20:17]<=15;
		4'd12:c[20:17]<=13;
		4'd13:c[20:17]<=0;
		4'd14:c[20:17]<=14;
		4'd15:c[20:17]<=9;
		default:c[20:17]<=0;
		endcase

	2'd1:
		case({b[29],b[28],b[27],b[26]})
		4'd0:c[20:17]<=14;
		4'd1:c[20:17]<=11;
		4'd2:c[20:17]<=2;
		4'd3:c[20:17]<=12;
		4'd4:c[20:17]<=4;
		4'd5:c[20:17]<=7;
		4'd6:c[20:17]<=13;
		4'd7:c[20:17]<=1;
		4'd8:c[20:17]<=5;
		4'd9:c[20:17]<=0;
		4'd10:c[20:17]<=15;
		4'd11:c[20:17]<=10;
		4'd12:c[20:17]<=3;
		4'd13:c[20:17]<=9;
		4'd14:c[20:17]<=8;
		4'd15:c[20:17]<=6;
		default:c[20:17]<=0;
		endcase
		

	2'd2:
		case({b[29],b[28],b[27],b[26]})
		4'd0:c[20:17]<=4;
		4'd1:c[20:17]<=2;
		4'd2:c[20:17]<=1;
		4'd3:c[20:17]<=11;
		4'd4:c[20:17]<=10;
		4'd5:c[20:17]<=13;
		4'd6:c[20:17]<=7;
		4'd7:c[20:17]<=8;
		4'd8:c[20:17]<=15;
		4'd9:c[20:17]<=9;
		4'd10:c[20:17]<=12;
		4'd11:c[20:17]<=5;
		4'd12:c[20:17]<=6;
		4'd13:c[20:17]<=3;
		4'd14:c[20:17]<=0;
		4'd15:c[20:17]<=14;
		default:c[20:17]<=0;
		endcase

	2'd3:
		case({b[29],b[28],b[27],b[26]})
		4'd0:c[20:17]<=11;
		4'd1:c[20:17]<=8;
		4'd2:c[20:17]<=12;
		4'd3:c[20:17]<=7;
		4'd4:c[20:17]<=1;
		4'd5:c[20:17]<=14;
		4'd6:c[20:17]<=2;
		4'd7:c[20:17]<=13;
		4'd8:c[20:17]<=6;
		4'd9:c[20:17]<=15;
		4'd10:c[20:17]<=0;
		4'd11:c[20:17]<=9;
		4'd12:c[20:17]<=10;
		4'd13:c[20:17]<=4;
		4'd14:c[20:17]<=5;
		4'd15:c[20:17]<=3;
		default:c[20:17]<=0;
		endcase
	default:c[20:17]<=0;
	endcase

	case({b[36],b[31]})/*第六个S盒*/
	2'd0:
		case({b[29],b[28],b[27],b[26]})
		4'd0:c[24:21]<=12;
		4'd1:c[24:21]<=1;
		4'd2:c[24:21]<=10;
		4'd3:c[24:21]<=15;
		4'd4:c[24:21]<=9;
		4'd5:c[24:21]<=2;
		4'd6:c[24:21]<=6;
		4'd7:c[24:21]<=8;
		4'd8:c[24:21]<=0;
		4'd9:c[24:21]<=13;
		4'd10:c[24:21]<=3;
		4'd11:c[24:21]<=4;
		4'd12:c[24:21]<=14;
		4'd13:c[24:21]<=7;
		4'd14:c[24:21]<=5;
		4'd15:c[24:21]<=11;
		default:c[24:21]<=0;
		endcase

	2'd1:
		case({b[29],b[28],b[27],b[26]})
		4'd0:c[24:21]<=10;
		4'd1:c[24:21]<=15;
		4'd2:c[24:21]<=4;
		4'd3:c[24:21]<=2;
		4'd4:c[24:21]<=7;
		4'd5:c[24:21]<=12;
		4'd6:c[24:21]<=9;
		4'd7:c[24:21]<=5;
		4'd8:c[24:21]<=6;
		4'd9:c[24:21]<=1;
		4'd10:c[24:21]<=13;
		4'd11:c[24:21]<=14;
		4'd12:c[24:21]<=0;
		4'd13:c[24:21]<=11;
		4'd14:c[24:21]<=3;
		4'd15:c[24:21]<=8;
		default:c[24:21]<=0;
		endcase

	2'd2:
		case({b[29],b[28],b[27],b[26]})
		4'd0:c[24:21]<=9;
		4'd1:c[24:21]<=14;
		4'd2:c[24:21]<=15;
		4'd3:c[24:21]<=5;
		4'd4:c[24:21]<=2;
		4'd5:c[24:21]<=8;
		4'd6:c[24:21]<=12;
		4'd7:c[24:21]<=3;
		4'd8:c[24:21]<=7;
		4'd9:c[24:21]<=0;
		4'd10:c[24:21]<=4;
		4'd11:c[24:21]<=10;
		4'd12:c[24:21]<=1;
		4'd13:c[24:21]<=13;
		4'd14:c[24:21]<=11;
		4'd15:c[24:21]<=6;
		default:c[24:21]<=0;
		endcase

	2'd3:
		case({b[29],b[28],b[27],b[26]})
		4'd0:c[24:21]<=4;
		4'd1:c[24:21]<=3;
		4'd2:c[24:21]<=2;
		4'd3:c[24:21]<=12;
		4'd4:c[24:21]<=9;
		4'd5:c[24:21]<=5;
		4'd6:c[24:21]<=15;
		4'd7:c[24:21]<=10;
		4'd8:c[24:21]<=11;
		4'd9:c[24:21]<=14;
		4'd10:c[24:21]<=1;
		4'd11:c[24:21]<=7;
		4'd12:c[24:21]<=6;
		4'd13:c[24:21]<=0;
		4'd14:c[24:21]<=8;
		4'd15:c[24:21]<=13;
		default:c[24:21]<=0;
		endcase
	default:c[24:21]<=0;
	endcase


	case({b[36],b[31]})/*第七个S盒*/	
	2'b0:
		case({b[41],b[40],b[39],b[38]})
		4'd0:c[28:25]<=4;
		4'd1:c[28:25]<=11;
		4'd2:c[28:25]<=2;
		4'd3:c[28:25]<=14;
		4'd4:c[28:25]<=15;
		4'd5:c[28:25]<=0;
		4'd6:c[28:25]<=8;
		4'd7:c[28:25]<=13;
		4'd8:c[28:25]<=3;
		4'd9:c[28:25]<=12;
		4'd10:c[28:25]<=9;
		4'd11:c[28:25]<=7;
		4'd12:c[28:25]<=5;
		4'd13:c[28:25]<=10;
		4'd14:c[28:25]<=6;
		4'd15:c[28:25]<=1;
		default:c[28:25]<=0;
		endcase


	2'b1:
		case({b[41],b[40],b[39],b[38]})
		4'd0:c[28:25]<=13;
		4'd1:c[28:25]<=0;
		4'd2:c[28:25]<=11;
		4'd3:c[28:25]<=7;
		4'd4:c[28:25]<=4;
		4'd5:c[28:25]<=9;
		4'd6:c[28:25]<=1;
		4'd7:c[28:25]<=10;
		4'd8:c[28:25]<=14;
		4'd9:c[28:25]<=3;
		4'd10:c[28:25]<=5;
		4'd11:c[28:25]<=12;
		4'd12:c[28:25]<=2;
		4'd13:c[28:25]<=15;
		4'd14:c[28:25]<=8;
		4'd15:c[28:25]<=6;
		default:c[28:25]<=0;
		endcase


	2'b2:
		case({b[41],b[40],b[39],b[38]})
		4'd0:c[28:25]<=1;
		4'd1:c[28:25]<=4;
		4'd2:c[28:25]<=11;
		4'd3:c[28:25]<=13;
		4'd4:c[28:25]<=12;
		4'd5:c[28:25]<=3;
		4'd6:c[28:25]<=7;
		4'd7:c[28:25]<=14;
		4'd8:c[28:25]<=10;
		4'd9:c[28:25]<=15;
		4'd10:c[28:25]<=6;
		4'd11:c[28:25]<=8;
		4'd12:c[28:25]<=0;
		4'd13:c[28:25]<=5;
		4'd14:c[28:25]<=9;
		4'd15:c[28:25]<=2;
		default:c[28:25]<=0;
		endcase


	2'b3:
		case({b[41],b[40],b[39],b[38]})
		4'd0:c[28:25]<=6;
		4'd1:c[28:25]<=11;
		4'd2:c[28:25]<=13;
		4'd3:c[28:25]<=8;
		4'd4:c[28:25]<=1;
		4'd5:c[28:25]<=4;
		4'd6:c[28:25]<=10;
		4'd7:c[28:25]<=7;
		4'd8:c[28:25]<=9;
		4'd9:c[28:25]<=5;
		4'd10:c[28:25]<=0;
		4'd11:c[28:25]<=15;
		4'd12:c[28:25]<=14;
		4'd13:c[28:25]<=2;
		4'd14:c[28:25]<=3;
		4'd15:c[28:25]<=12;
		default:c[28:25]<=0;
		endcase
	default:c[28:25]<=0;
	endcase

	case({b[48],b[43]})/*第八个S盒*/
	2'b0:
		case({b[47],b[46],b[45],b[44]})
		4'd0:c[32:29]<=13;
		4'd1:c[32:29]<=2;
		4'd2:c[32:29]<=8;
		4'd3:c[32:29]<=4;
		4'd4:c[32:29]<=6;
		4'd5:c[32:29]<=15;
		4'd6:c[32:29]<=11;
		4'd7:c[32:29]<=1;
		4'd8:c[32:29]<=10;
		4'd9:c[32:29]<=9;
		4'd10:c[32:29]<=3;
		4'd11:c[32:29]<=14;
		4'd12:c[32:29]<=5;
		4'd13:c[32:29]<=0;
		4'd14:c[32:29]<=12;
		4'd15:c[32:29]<=7;
		default:c[32:29]<=0;
		endcase

	2'b1:
		case({b[47],b[46],b[45],b[44]})
		4'd0:c[32:29]<=1;
		4'd1:c[32:29]<=15;
		4'd2:c[32:29]<=13;
		4'd3:c[32:29]<=8;
		4'd4:c[32:29]<=10;
		4'd5:c[32:29]<=3;
		4'd6:c[32:29]<=7;
		4'd7:c[32:29]<=4;
		4'd8:c[32:29]<=12;
		4'd9:c[32:29]<=5;
		4'd10:c[32:29]<=6;
		4'd11:c[32:29]<=11;
		4'd12:c[32:29]<=0;
		4'd13:c[32:29]<=14;
		4'd14:c[32:29]<=9;
		4'd15:c[32:29]<=2;
		default:c[32:29]<=0;
		endcase

	2'b2:
		case({b[47],b[46],b[45],b[44]})
		4'd0:c[32:29]<=7;
		4'd1:c[32:29]<=11;
		4'd2:c[32:29]<=4;
		4'd3:c[32:29]<=1;
		4'd4:c[32:29]<=9;
		4'd5:c[32:29]<=12;
		4'd6:c[32:29]<=14;
		4'd7:c[32:29]<=2;
		4'd8:c[32:29]<=0;
		4'd9:c[32:29]<=6;
		4'd10:c[32:29]<=10;
		4'd11:c[32:29]<=13;
		4'd12:c[32:29]<=15;
		4'd13:c[32:29]<=3;
		4'd14:c[32:29]<=5;
		4'd15:c[32:29]<=8;
		default:c[32:29]<=0;
		endcase

	2'b3:
		case({b[47],b[46],b[45],b[44]})
		4'd0:c[32:29]<=2;
		4'd1:c[32:29]<=1;
		4'd2:c[32:29]<=14;
		4'd3:c[32:29]<=7;
		4'd4:c[32:29]<=4;
		4'd5:c[32:29]<=10;
		4'd6:c[32:29]<=8;
		4'd7:c[32:29]<=13;
		4'd8:c[32:29]<=12;
		4'd9:c[32:29]<=15;
		4'd10:c[32:29]<=9;
		4'd11:c[32:29]<=0;
		4'd12:c[32:29]<=3;
		4'd13:c[32:29]<=5;
		4'd14:c[32:29]<=6;
		4'd15:c[32:29]<=11;
		default:c[32:29]<=0;
		endcase
	default:c[32:29]<=0;
	endcase
	default:c[32:29]<=6;
	endcase
		

end
end	

	

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