(Delphi ActiveX) Find a Certificate by it's SHA-1 Thumbprint

Finds a certificate by it's SHA-1 hex thumbprint. Parts of this example are specific to Windows because it searches the Windows Current User certificate store.

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
certStore: TChilkatCertStore;
thumbprint: WideString;
bReadOnly: Integer;
success: Integer;
cert: IChilkatCert;
certStorePem: TChilkatCertStore;

begin
certStore := TChilkatCertStore.Create(Self);

thumbprint := '12c1dd8015f3f03f7b1fa619dc24e2493ca8b4b2';

// This part of the example is specific to Windows because it is opening the Windows Current-User certificate store.
bReadOnly := 1;
success := certStore.OpenCurrentUserStore(bReadOnly);
if (success <> 1) then
  begin
    Memo1.Lines.Add(certStore.LastErrorText);
    Exit;
  end;

// Find the certificate with the desired thumbprint
cert := certStore.FindCertBySha1Thumbprint(thumbprint);
if (certStore.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add('Failed to find the certificate.');
    Exit;
  end;

Memo1.Lines.Add('Found: ' + cert.SubjectCN);

// -------------------------------------------------------------------------------------
// Alternatively, one could load a certificate store object with certs from a PEM file,
// and do the same thing..
certStorePem := TChilkatCertStore.Create(Self);

success := certStorePem.LoadPemFile('pemFiles/certificates.pem');
if (success <> 1) then
  begin
    Memo1.Lines.Add(certStorePem.LastErrorText);
    Exit;
  end;

cert := certStorePem.FindCertBySha1Thumbprint(thumbprint);
if (certStorePem.LastMethodSuccess <> 1) then
  begin
    Memo1.Lines.Add('Failed to find the certificate.');
    Exit;
  end;

Memo1.Lines.Add('Found: ' + cert.SubjectCN);
end;