Pascal (Lazarus/Delphi)

Generate new DSA Key from OpenSSL Parameters File

See more DSA Examples

Generates a new DSA key from an OpenSSL-created parameters file (DER and PEM formats supported). Examples of using OpenSSL to create parameter files are shown here:

openssl dsaparam -outform DER 1024 <  seedData.txt >dsaparam.der

openssl dsaparam 1024 < seedData.txt >dsaparam.pem

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;
  pemStr: string;
  xmlStr: string;
  bPublicOnly: Boolean;

begin
  success := False;

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

  dsa := TDsa.Create;

  success := dsa.GenKeyFromParamsDerFile('dsaparam.der');
  if (success <> True) then
    begin
      WriteLn(dsa.LastErrorText);
      Exit;
    end;

  //  To generate a key from PEM, call GenKeyFromParamsPem 
  //  (for an in-memory PEM string) or GenKeyFromParamsFilePem
  //  for a PEM file.

  //  The public and private keys may now be exported to PEM, DER,
  //  and XML formatted files.

  //  First for the public key...
  //  The public key never needs to be encrypted.

  //  Save the public key in PEM format:
  pemStr := dsa.ToPublicPem();
  //  This example will not check the return value of SaveText...
  success := dsa.SaveText(pemStr,'dsa_pub.pem');

  //  Save the public key in DER format:
  success := dsa.ToPublicDerFile('dsa_pub.der');

  bPublicOnly := True;
  //  Save to XML
  xmlStr := dsa.ToXml(bPublicOnly);
  success := dsa.SaveText(pemStr,'dsa_pub.xml');

  //  ------------------------------------
  //  Now for the private key....
  //  ------------------------------------

  //  Unencrypted PEM:
  pemStr := dsa.ToPem();
  success := dsa.SaveText(pemStr,'dsa_priv.pem');

  //  Encrypted PEM:
  pemStr := dsa.ToEncryptedPem('myPassword');
  success := dsa.SaveText(pemStr,'dsa_privEncrypted.pem');

  //  DER:
  success := dsa.ToDerFile('dsa_priv.der');

  //  XML:
  bPublicOnly := False;
  xmlStr := dsa.ToXml(bPublicOnly);
  success := dsa.SaveText(pemStr,'dsa_priv.xml');

  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.