(Delphi DLL) RSA OAEP Padding

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

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
rsa: HCkRsa;
publicKey: PWideChar;
success: Boolean;
plainText: PWideChar;
usePrivateKey: Boolean;
encryptedStr: PWideChar;

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

rsa := CkRsa_Create();

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

success := CkRsa_ImportPublicKey(rsa,publicKey);

// To use Optimal Asymmetric Encryption Padding (OAEP) padding,
// simply set the OaepPadding property:
CkRsa_putOaepPadding(rsa,True);

// Encrypt a string and return the encrypted data base64-encoded:
CkRsa_putEncodingMode(rsa,'base64');

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

usePrivateKey := False;
encryptedStr := CkRsa__encryptStringENC(rsa,plainText,usePrivateKey);
Memo1.Lines.Add(encryptedStr);

CkRsa_Dispose(rsa);

end;