(Delphi ActiveX) Iterate Keys and Certs in PEM

Demonstrates how to access each of the private keys and certs contained within a PEM.

Note: This example requires Chilkat v11.0.0 or greater.

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
success: Integer;
pem: TChilkatPem;
password: WideString;
pemContent: WideString;
numPrivateKeys: Integer;
i: Integer;
privKey: TPrivateKey;
cert: TChilkatCert;
numCerts: Integer;

begin
success := 0;

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

pem := TChilkatPem.Create(Self);

// Load the PEM from a file.
// If the PEM is encrypted, provide a password.  Otherwise pass an empty string for the password.
password := 'myPassword';
success := pem.LoadPemFile('../myPemFiles/myPem.pem',password);
if (success = 0) then
  begin
    Memo1.Lines.Add(pem.LastErrorText);
    Exit;
  end;

// Note: If the app already has the PEM pre-loaded in a string variable, then load it 
// by calling LoadPem instead.  
pemContent := '... the PEM contents ...';
success := pem.LoadPem(pemContent,password);
// Check for success as before..

// Iterate over the private keys.
numPrivateKeys := pem.NumPrivateKeys;
i := 0;

privKey := TPrivateKey.Create(Self);
while i < numPrivateKeys do
  begin
    pem.PrivateKeyAt(i,privKey.ControlInterface);
    Memo1.Lines.Add('Private Key ' + IntToStr(i) + ' is ' + IntToStr(privKey.BitLength) + ' in length');
    i := i + 1;
  end;

// Iterate over the certificates.
cert := TChilkatCert.Create(Self);
numCerts := pem.NumCerts;
i := 0;
while i < numCerts do
  begin
    pem.CertAt(i,cert.ControlInterface);
    Memo1.Lines.Add('Certificate ' + IntToStr(i) + ' : ' + cert.SubjectDN);
    i := i + 1;
  end;
end;