Delphi DLL

AES Encryption ECB Mode with PKCS7 Padding

See more Encryption Examples

Duplicates the following C# code:

public static byte[] DecryptBySymmetricKey(string encryptedText, byte[] key)
  {
     string keyAsBase64 = Convert.ToBase64String(key);

     byte[] dataToDecrypt = Convert.FromBase64String(encryptedText);
     var keyBytes = key;
     AesManaged tdes = new AesManaged();
     tdes.KeySize = 256;
     tdes.BlockSize = 128;
     tdes.Key = keyBytes;
     tdes.Mode = CipherMode.ECB;
     tdes.Padding = PaddingMode.PKCS7;
     ICryptoTransform decrypt__1 = tdes.CreateDecryptor();
     byte[] deCipher = decrypt__1.TransformFinalBlock(dataToDecrypt, 0, dataToDecrypt.Length);
     tdes.Clear();
     string EK_result = Convert.ToBase64String(deCipher);
     return EK_result;
}

Delphi DLL

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: HCkCrypt2;
keyAsBase64: PWideChar;
encryptedBytesAsBase64: PWideChar;
EK_result: PWideChar;

begin
// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

crypt := CkCrypt2_Create();

// In the C# code above that is to be duplicated here, use the base64 encoded key.
keyAsBase64 := '...';
encryptedBytesAsBase64 := '....';

CkCrypt2_putKeyLength(crypt,256);
CkCrypt2_putCryptAlgorithm(crypt,'AES');
CkCrypt2_putCipherMode(crypt,'ecb');
CkCrypt2_putPaddingScheme(crypt,0);
CkCrypt2_SetEncodedKey(crypt,keyAsBase64,'base64');

CkCrypt2_putEncodingMode(crypt,'base64');

// Pass the base64 representation of the encrypted data.
// (The EncodingMode indicates you are passing base64.)
EK_result := CkCrypt2__decryptStringENC(crypt,encryptedBytesAsBase64);

Memo1.Lines.Add(EK_result);

CkCrypt2_Dispose(crypt);

end;