Delphi ActiveX

Generate an RSA Key and Get as Base64 DER

See more RSA Examples

Demonstrates how to generate a 2048-bit RSA key and return the public and private parts as unencrypted Base64 encoded DER. Delphi ActiveX

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;
privKey: TPrivateKey;
pubKey: TPublicKey;
bChoosePkcs1: Integer;
pubKeyBase64Der: WideString;
privKeyPkcs1: WideString;
privKeyPkcs8: 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);

// Generate a 2048-bit key.
privKey := TPrivateKey.Create(Self);
success := rsa.GenKey(2048,privKey.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(rsa.LastErrorText);
    Exit;
  end;

// Get the public part of the key.
pubKey := TPublicKey.Create(Self);
privKey.ToPublicKey(pubKey.ControlInterface);

// There are two possible formats for representing the RSA public key 
// in ASN.1 (DER).  The possible formats are PKCS1 and PKCS8.
// We can get either by setting bChoosePkcs1 to 1 or 0.
bChoosePkcs1 := 1;
pubKeyBase64Der := pubKey.GetEncoded(bChoosePkcs1,'base64');
Memo1.Lines.Add('Public Key Base64 DER:');
Memo1.Lines.Add(pubKeyBase64Der);

// Get the private key as Base64 DER:
// We can get PKCS1 or PKCS8, but with different methods:
privKeyPkcs1 := privKey.GetPkcs1ENC('base64');
Memo1.Lines.Add('Private Key PKCS1 Base64 DER:');
Memo1.Lines.Add(privKeyPkcs1);

privKeyPkcs8 := privKey.GetPkcs8ENC('base64');
Memo1.Lines.Add('Private Key PKCS8 Base64 DER:');
Memo1.Lines.Add(privKeyPkcs8);
end;