Pascal (Lazarus/Delphi)

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. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.PrivateKey,
  Chilkat.Rsa,
  Chilkat.PublicKey;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  rsa: TRsa;
  privKey: TPrivateKey;
  pubKey: TPublicKey;
  bChoosePkcs1: Boolean;
  pubKeyBase64Der: string;
  privKeyPkcs1: string;
  privKeyPkcs8: string;

begin
  success := False;

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

  rsa := TRsa.Create;

  //  Generate a 2048-bit key.
  privKey := TPrivateKey.Create;
  success := rsa.GenKey(2048,privKey);
  if (success = False) then
    begin
      WriteLn(rsa.LastErrorText);
      Exit;
    end;

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

  //  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 := pubKey.GetEncoded(bChoosePkcs1,'base64');
  WriteLn('Public Key Base64 DER:');
  WriteLn(pubKeyBase64Der);

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

  privKeyPkcs8 := privKey.GetPkcs8ENC('base64');
  WriteLn('Private Key PKCS8 Base64 DER:');
  WriteLn(privKeyPkcs8);


  rsa.Free;
  privKey.Free;
  pubKey.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.