(Delphi ActiveX) Convert DSA PEM Private Key to DER

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.

Chilkat for Delphi Downloads Chilkat ActiveX DLL for Delphi Chilkat non-ActiveX DLL for Delphi * The examples here use the ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Chilkat_TLB;

...

procedure TForm1.Button1Click(Sender: TObject);
var
dsa: TChilkatDsa;
pemPrivateKey: WideString;
success: Integer;

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

dsa := TChilkatDsa.Create(Self);

// 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 <> 1) then
  begin
    Memo1.Lines.Add(dsa.LastErrorText);
    Exit;
  end;

// Write it out as a DER file:
success := dsa.ToDerFile('dsa_priv.der');
if (success <> 1) then
  begin
    Memo1.Lines.Add(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 <> 1) then
  begin
    Memo1.Lines.Add(dsa.LastErrorText);
    Exit;
  end;

// Write it out as an unencrypted DER file:
success := dsa.ToDerFile('dsa_priv2.der');
if (success <> 1) then
  begin
    Memo1.Lines.Add(dsa.LastErrorText);
    Exit;
  end;

Memo1.Lines.Add('Finished!');
end;