Delphi 官方 MD5

去官方文档搜就行了，引入System.Hash 单元：

http://docwiki.embarcadero.com/Libraries/Athens/en/System.Hash.THashMD5

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unit Unit4;

interface

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

type
  TForm4 = class(TForm)
    edt1: TEdit;
    btn1: TButton;
    edt2: TEdit;
    lbl1: TLabel;
    lbl2: TLabel;
    lbl3: TLabel;
    procedure btn1Click(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form4: TForm4;

implementation

{$R *.dfm}

procedure TForm4.btn1Click(Sender: TObject);
begin
  //THashMD5 是个记录，GetHashString是个类方法，所以可以这样直接使用，不用创建和释放
  edt2.Text := THashMD5.GetHashString(Trim(edt1.Text));
end;

procedure TForm4.FormCreate(Sender: TObject);
begin
  ReportMemoryLeaksOnShutdown := true;
end;

end.