Probleme mit DCPcrypt

[KodeZwerg]

Im Anhang ist das Projekt, nun für alles Edit-Felder vorhanden. Viel Spass damit.

Hier der Code:

Delphi-Quellcode:

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls,
  DCPcrypt2, DCPblockciphers, DCPrijndael, DCPbase64;

type
  TForm1 = class(TForm)
    Button1: TButton;
    Button2: TButton;
    Memo1: TMemo;
    eText: TEdit;
    CheckBox1: TCheckBox;
    CheckBox2: TCheckBox;
    eKey: TEdit;
    eMKey: TEdit;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

function DecryptText( Data, Key, MasterKey: AnsiString ):String;
var Cipher : TDCP_rijndael;
    index, dataLength, bsize, pad: integer;
begin
  Data := DCPBase64.Base64DecodeStr(Data);
  Cipher := TDCP_rijndael.Create(NIL);
  try
    Cipher.Init(Key[1],128,@MasterKey[1]);
    Cipher.DecryptCBC(Data[1],Data[1],Length(Data));
    if form1.CheckBox1.Checked then
    begin
      pad := ord(Data[length(Data)]);
      SetLength(Data, length(Data)-pad);
    end;
  finally
    Cipher.Burn;
    Cipher.Free;
  end;
  if form1.CheckBox2.Checked then
   form1.Memo1.Lines.Add(Trim(Data))
   else form1.Memo1.Lines.Add(Data);
  if form1.CheckBox2.Checked then
   form1.eText.Text := Trim(Data)
   else form1.eText.Text := Data;
end;

function EncryptText( Data, Key, MasterKey: AnsiString ):String;
var Cipher : TDCP_rijndael;
    {Data,}DataDec{, Key, IV }: ansistring;
    index, dataLength, bsize, pad: integer;
begin
  Cipher := TDCP_rijndael.Create(nil);
  try
    Cipher.Init(Key[1],128,@MasterKey[1]);
    dataLength := Length(Data);
    bsize := (Cipher.BlockSize div 8);
    pad := bsize - (dataLength mod bsize);
    for index := 1 to pad do
      Data := Data+chr(pad);
    Cipher.EncryptCBC(Data[1],Data[1],Length(Data));
  finally
    Cipher.Burn;
    Cipher.Free;
  end;
  Data := DCPBase64.Base64EncodeStr(Data);
  form1.Memo1.Lines.Add(Data);
  form1.eText.Text := Data;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  EncryptText(eText.Text, eKey.Text, eMKey.Text);
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  DecryptText(eText.Text, eKey.Text, eMKey.Text);
end;

end.

Und wie bereits erwähnt wurde, das ist momentan nur für Text geeignet. Vorschau.jpg