Pascal (Lazarus/Delphi)

Convert DSA PEM Private Key to DER

See more DSA Examples

Converts a DSA private key from PEM format to DER. The first part of the example will convert an unencrypted PEM to DER, then 2nd part will convert an encrypted PEM to unencrypted 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.Dsa;

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

procedure RunDemo;
var
  success: Boolean;
  dsa: TDsa;
  pemPrivateKey: string;

begin
  success := False;

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

  dsa := TDsa.Create;

  //  Load a PEM private key.

  pemPrivateKey := dsa.LoadText('dsa_priv.pem');
  //  Import the unencrypted PEM into the DSA object.
  success := dsa.FromPem(pemPrivateKey);
  if (success <> True) then
    begin
      WriteLn(dsa.LastErrorText);
      Exit;
    end;

  //  Write it out as a DER file:
  success := dsa.ToDerFile('dsa_priv.der');
  if (success <> True) then
    begin
      WriteLn(dsa.LastErrorText);
      Exit;
    end;

  //  Load an encrypted PEM private key.
  pemPrivateKey := dsa.LoadText('dsa_privEncrypted.pem');
  //  Import the encrypted PEM into the DSA object.
  success := dsa.FromEncryptedPem('myPassword',pemPrivateKey);
  if (success <> True) then
    begin
      WriteLn(dsa.LastErrorText);
      Exit;
    end;

  //  Write it out as an unencrypted DER file:
  success := dsa.ToDerFile('dsa_priv2.der');
  if (success <> True) then
    begin
      WriteLn(dsa.LastErrorText);
      Exit;
    end;

  WriteLn('Finished!');


  dsa.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.