(Delphi ActiveX) Use HTTPS Client Certificate from .cer and .key Files

Demonstrates how to load a cert + private key from .cer and .key (base64) files and use it for mutual TLS authentication (client-side certificate).

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
http: TChilkatHttp;
cert: TChilkatCert;
privKey: TPrivateKey;
success: Integer;
bd: TChilkatBinData;

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

http := TChilkatHttp.Create(Self);

cert := TChilkatCert.Create(Self);
privKey := TPrivateKey.Create(Self);

// Load any type of certificate (.cer, .p7b, .pem, etc.) by calling LoadFromFile.
success := cert.LoadFromFile('qa_data/certs/sample_cert_a.cer');
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

// Load the private key.
bd := TChilkatBinData.Create(Self);
success := bd.LoadFile('qa_data/certs/sample_key_a.key');
success := privKey.LoadAnyFormat(bd.ControlInterface,'privateKeyPasswordIfNecessary');
if (success <> 1) then
  begin
    Memo1.Lines.Add(privKey.LastErrorText);
    Exit;
  end;

// Associate the private key with the cert.
success := cert.SetPrivateKey(privKey.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(cert.LastErrorText);
    Exit;
  end;

// Set the certificate to be used for mutual TLS authentication
// (i.e. sets the client-side certificate for two-way TLS authentication)
success := http.SetSslClientCert(cert.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

// At this point, the HTTP object instance is setup with the client-side cert, and any SSL/TLS
// connection will automatically use it if the server demands a client-side cert.
end;