(Delphi ActiveX) FatturaPA XML Invoice Sign+Encrypt to P7M

Demonstrates how to create a CAdES BES signed + encrypted invoice.xml.p7m for the Italian FatturaPA exchange system.

Note: This example requires Chilkat v9.5.0.75 or greater.

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;
pfxPath: WideString;
pfxPassword: WideString;
cert: TChilkatCert;
success: Integer;
jsonSignedAttrs: TChilkatJsonObject;
inFile: WideString;
sigFile: WideString;
encryptCert: TChilkatCert;

begin
// Note: Requires Chilkat v9.5.0.75 or greater.

// This 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).
pfxPath := 'qa_data/pfx/cert_test123.pfx';
pfxPassword := 'test123';

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

// Provide the signing cert (with associated private key).
success := crypt.SetSigningCert(cert.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

// Indicate that SHA-256 should be used.
crypt.HashAlgorithm := 'sha256';

// Specify the signed attributes to be included.
// (This is what makes it CAdES-BES compliant.)
jsonSignedAttrs := TChilkatJsonObject.Create(Self);
jsonSignedAttrs.UpdateInt('contentType',1);
jsonSignedAttrs.UpdateInt('signingTime',1);
jsonSignedAttrs.UpdateInt('messageDigest',1);
jsonSignedAttrs.UpdateInt('signingCertificateV2',1);
crypt.SigningAttributes := jsonSignedAttrs.Emit();

inFile := 'qa_data/xml/IT01234567890_11002.xml';
sigFile := 'qa_data/fatturapa/signed.p7m';

// Create the CAdES-BES signature, which contains the original data.
success := crypt.CreateP7M(inFile,sigFile);
if (success = 0) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

// Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
encryptCert := TChilkatCert.Create(Self);
success := encryptCert.LoadFromFile('qa_data/certs/fatturapa_cert.pem');
if (success <> 1) then
  begin
    Memo1.Lines.Add(encryptCert.LastErrorText);
    Exit;
  end;

crypt.CryptAlgorithm := 'pki';

success := crypt.SetEncryptCert(encryptCert.ControlInterface);
if (success <> 1) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

// Indicate the underlying bulk encryption algorithm to be used:
crypt.Pkcs7CryptAlg := 'aes';
crypt.KeyLength := 128;

// There's one last option that could be set.  If is the RSA encryption encryption/padding scheme. 
// By default, RSAES_PKCS1-V1_5 is used.  If desired, the OaepPadding property could be set to 1 to
// use RSAES_OAEP.  (We'll leave it set at the default value of 0)
crypt.OaepPadding := 0;

// Everything is specified.  Encrypt the .p7m to create a new .p7m (which adds a layer of encryption around the opaque signature).
// The output is PKCS7 in binary DER format.
success := crypt.CkEncryptFile(sigFile,'qa_output/signed_and_encrypted.p7m');
if (success <> 1) then
  begin
    Memo1.Lines.Add(crypt.LastErrorText);
    Exit;
  end;

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