Pascal (Lazarus/Delphi)

Generate an RSA Key and Save to Encrypted PEM

See more RSA Examples

Demonstrates how to generate an RSA key and save to an encrypted PEM file. 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;
  password: string;
  path: string;
  pubKey: TPublicKey;
  preferPkcs1: Boolean;

begin
  success := False;

  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;

  password := 'secret';
  //  Saving to a relative path (from the current working directory of the process).
  path := 'rsaKeys/myTestRsaPrivate.pem';
  //  Encrypt the PEM using 256-bit AES encryption.
  privKey.Pkcs8EncryptAlg := 'aes256';
  success := privKey.SavePkcs8EncryptedPemFile(password,path);
  if (success = False) then
    begin
      WriteLn(privKey.LastErrorText);
      Exit;
    end;

  //  

  //  We can also save the public key.
  //  There is no need to encrypt public keys.
  pubKey := TPublicKey.Create;
  privKey.ToPublicKey(pubKey);

  path := 'rsaKeys/myTestRsaPublic.pem';
  //  Choose PKCS1 or PKCS8
  //  We'll choose PKCS8.
  preferPkcs1 := False;
  success := pubKey.SavePemFile(preferPkcs1,path);
  if (success = False) then
    begin
      WriteLn(pubKey.LastErrorText);
      Exit;
    end;

  //  

  WriteLn('Success.');


  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.