(Delphi DLL) Extract XML from FatturaPA .p7m

Demonstrates how to verify the signature and extract the XML from a FatturaPA .p7m file.

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, BinData, Xml, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
bd: HCkBinData;
success: Boolean;
crypt: HCkCrypt2;
bVerified: Boolean;
xml: HCkXml;

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

bd := CkBinData_Create();
success := CkBinData_LoadFile(bd,'qa_data/p7m/IT01879020517_abc.xml.p7m');
if (success <> True) then
  begin
    Memo1.Lines.Add('Failed to load the .p7m file');
    Exit;
  end;

crypt := CkCrypt2_Create();

// Verify and extrct the payload contained within the .p7m.
// In this case, the payload is the FatturaPA XML.
// If successful, the resulting bd will contain only the XML.
bVerified := CkCrypt2_OpaqueVerifyBd(crypt,bd);
if (bVerified <> True) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Memo1.Lines.Add('Failed to extract and verify.');
    Exit;
  end;

// Save the XML to a file.
CkBinData_WriteFile(bd,'qa_output/zIT01879020517_abc.xml');

// Alternatively, load into an XML object and emit.
xml := CkXml_Create();
CkXml_LoadXml(xml,CkBinData__getString(bd,'utf-8'));

Memo1.Lines.Add(CkXml__getXml(xml));

CkBinData_Dispose(bd);
CkCrypt2_Dispose(crypt);
CkXml_Dispose(xml);

end;