(Delphi ActiveX) Sign a File to Create a .p7m File (using a PFX)

Delphi ActiveX example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

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
crypt: TChilkatCrypt2;
signingCertSubject: WideString;
pfxFilename: WideString;
pfxPassword: WideString;
certStore: TChilkatCertStore;
success: Integer;
cert: IChilkatCert;
inFile: WideString;
outputFile: WideString;

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

crypt := TChilkatCrypt2.Create(Self);

// Use a digital certificate and private key from a PFX file (.pfx or .p12).
signingCertSubject := 'Acme Inc';
pfxFilename := '/Users/chilkat/testData/pfx/acme.pfx';
pfxPassword := 'test123';

certStore := TChilkatCertStore.Create(Self);
success := certStore.LoadPfxFile(pfxFilename,pfxPassword);
if (success <> 1) then
  begin
    Memo1.Lines.Add(certStore.LastErrorText);
    Exit;
  end;

cert := certStore.FindCertBySubjectCN(signingCertSubject);
if (certStore.LastMethodSuccess = 0) then
  begin
    Memo1.Lines.Add('Failed to find certificate by subject common name.');
    Exit;
  end;

// Tell the crypt component to use this cert.
success := crypt.SetSigningCert(cert);

// We can sign any type of file, creating a .p7m as output:
inFile := '/Users/chilkat/testData/pdf/sample.pdf';
outputFile := '/Users/chilkat/testData/p7m/sample.pdf.p7m';
success := crypt.CreateP7M(inFile,outputFile);
if (success = 0) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);

    Exit;
  end;

// Verify and restore the original file:
success := crypt.SetVerifyCert(cert);

inFile := outputFile;
outputFile := '/Users/chilkat/testData/pdf/restored.pdf';

success := crypt.VerifyP7M(inFile,outputFile);
if (success = 0) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);

    Exit;
  end;

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