(Delphi DLL) Generate an RSA Key and Get as Base64 DER

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

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, PrivateKey, Rsa, PublicKey;

...

procedure TForm1.Button1Click(Sender: TObject);
var
rsa: HCkRsa;
success: Boolean;
pubKey: HCkPublicKey;
bChoosePkcs1: Boolean;
pubKeyBase64Der: PWideChar;
privKey: HCkPrivateKey;
privKeyPkcs1: PWideChar;
privKeyPkcs8: PWideChar;

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

rsa := CkRsa_Create();

// Generate a 2048-bit key.  Chilkat RSA supports
success := CkRsa_GenerateKey(rsa,2048);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkRsa__lastErrorText(rsa));
    Exit;
  end;

// Get the public part of the key.
pubKey := CkRsa_ExportPublicKeyObj(rsa);

// 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 True or False.
bChoosePkcs1 := True;
pubKeyBase64Der := CkPublicKey__getEncoded(pubKey,bChoosePkcs1,'base64');
Memo1.Lines.Add('Public Key Base64 DER:');
Memo1.Lines.Add(pubKeyBase64Der);

CkPublicKey_Dispose(pubKey);

// Now get the private key as Base64 DER:
// Get the private part of the key.
// (Note: A public key is actually just a subset of the private key.  
//  If you have the private key, you also have the public key.
//  Thus Chilkat provides a method to get the public key from the private key.)
privKey := CkRsa_ExportPrivateKeyObj(rsa);

// Again, we can get PKCS1 or PKCS8, but with different methods:
privKeyPkcs1 := CkPrivateKey__getPkcs1ENC(privKey,'base64');
Memo1.Lines.Add('Private Key PKCS1 Base64 DER:');
Memo1.Lines.Add(privKeyPkcs1);

privKeyPkcs8 := CkPrivateKey__getPkcs8ENC(privKey,'base64');
Memo1.Lines.Add('Private Key PKCS8 Base64 DER:');
Memo1.Lines.Add(privKeyPkcs8);

CkPrivateKey_Dispose(privKey);

CkRsa_Dispose(rsa);

end;