简单的加密解密

unit Unit1;

interface

uses
  Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
  Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Vcl.ExtCtrls;

type
  TForm1 = class(TForm)
    LabeledEdit1: TLabeledEdit;
    LabeledEdit2: TLabeledEdit;
    LabeledEdit3: TLabeledEdit;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
var

XorKey: array[0..7] of Byte = ($AB, $CD, $E1, $0A, $1B, $2C, $3D, $4E);    //加密字符  16进制

function Enc(str: string): string;  //加密函数
var
 i, j: Integer;
begin
 Result := '';
 j := 0;
 for i := 1 to Length(str) do
 begin
 Result := Result + IntToHex(Byte(str[i]) xor XorKey[j], 2);  //Byte(str[i])：取 str[i]的Ascll 后与 XorKey[j]异或 取2位 再转换成16进制
 j := (j + 1) mod 8;
 end;
end;


procedure TForm1.Button1Click(Sender: TObject);
begin
  LabeledEdit2.Text:= Enc(LabeledEdit1.Text);

end;


function Dec(str: string): string;   //解密函数
var
 i, j: Integer;
begin
 Result := '';
 j := 0;
 for i := 1 to Length(str) div 2 do
 begin
 Result := Result + Char(StrToInt('$' + Copy(str, i * 2 - 1, 2)) xor
 XorKey[j]);
 j := (j + 1) mod 8;
 end;
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
LabeledEdit3.Text:= Dec(LabeledEdit2.Text);
end;

end.