Delphi ActiveX

Get the Server Certificate, Certificate Chain, and Root CA Certificate

See more HTTP Examples

Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate. Delphi ActiveX

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;
http: TChilkatHttp;
sslCert: TChilkatCert;
certChain: TChilkatCertChain;
cert: TChilkatCert;
i: Integer;
numCerts: Integer;
caCert: TChilkatCert;

begin
success := 0;

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

http := TChilkatHttp.Create(Self);

// We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
sslCert := TChilkatCert.Create(Self);
success := http.GetServerCert('apple.com',443,sslCert.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(http.LastErrorText);
    Exit;
  end;

certChain := TChilkatCertChain.Create(Self);
success := sslCert.BuildCertChain(certChain.ControlInterface);
if (success = 0) then
  begin
    Memo1.Lines.Add(sslCert.LastErrorText);
    Exit;
  end;

cert := TChilkatCert.Create(Self);
i := 0;
numCerts := certChain.NumCerts;
while i < numCerts do
  begin
    certChain.CertAt(i,cert.ControlInterface);
    Memo1.Lines.Add('SubjectDN ' + IntToStr(i) + ': ' + cert.SubjectDN);
    Memo1.Lines.Add('IssuerDN ' + IntToStr(i) + ': ' + cert.IssuerDN);
    i := i + 1;
  end;

// If the certificate chain reaches the root CA cert, then the last cert in the chain
// is the root CA cert.
if (certChain.ReachesRoot = 1) then
  begin
    caCert := TChilkatCert.Create(Self);
    certChain.CertAt(numCerts - 1,caCert.ControlInterface);
    Memo1.Lines.Add('CA Root Cert: ' + caCert.SubjectDN);
  end;
end;