(Delphi ActiveX) RSA OAEP Padding

Demonstrates how to use OAEP padding with the RSA encryption algorithm. More information about OAEP Padding.

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Integer;
rsa: TChilkatRsa;
pubKeyXml: WideString;
pubKey: TPublicKey;
plainText: WideString;
usePrivateKey: Integer;
encryptedStr: WideString;

begin
success := 0;

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

rsa := TChilkatRsa.Create(Self);

// RSA public key in XML format:
pubKeyXml := '<RSAPublicKey><Modulus>of3im3mRgd2NLXIGoK6uYLg6jj0Ug2b42rnqa5Tbwz2ieFqMJqt+++x2oqLYGurlz49nt+7/785g3XYWqoka4u9c9zul6YubIjnBM72dQy7rEkEfbUxgjcxqXyjZFx+FpaxFUecLu688XEu+9UA42VKiCgcl+E7TrqnfeeYpNXc=</Modulus><Exponent>AQAB</Exponent></RSAPublicKey>';

pubKey := TPublicKey.Create(Self);
success := pubKey.LoadFromString(pubKeyXml);
if (success = 0) then
  begin
    Memo1.Lines.Add(pubKey.LastErrorText);
    Exit;
  end;

success := rsa.UsePublicKey(pubKey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(rsa.LastErrorText);
    Exit;
  end;

// To use Optimal Asymmetric Encryption Padding (OAEP) padding,
// simply set the PkcsPadding property to 0
rsa.PkcsPadding := 0;

// Encrypt a string and return the encrypted data base64-encoded:
rsa.EncodingMode := 'base64';

plainText := 'RSA Encryption should be easy.';

usePrivateKey := 0;
encryptedStr := rsa.EncryptStringENC(plainText,usePrivateKey);
Memo1.Lines.Add(encryptedStr);
end;