(Delphi DLL) 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 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, Cert, JsonObject, Crypt2;

...

procedure TForm1.Button1Click(Sender: TObject);
var
crypt: HCkCrypt2;
pfxPath: PWideChar;
pfxPassword: PWideChar;
cert: HCkCert;
success: Boolean;
jsonSignedAttrs: HCkJsonObject;
inFile: PWideChar;
sigFile: PWideChar;
encryptCert: HCkCert;

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 := CkCrypt2_Create();

// Use a digital certificate and private key from a PFX file (.pfx or .p12).
pfxPath := 'qa_data/pfx/cert_test123.pfx';
pfxPassword := 'test123';

cert := CkCert_Create();
success := CkCert_LoadPfxFile(cert,pfxPath,pfxPassword);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(cert));
    Exit;
  end;

// Provide the signing cert (with associated private key).
success := CkCrypt2_SetSigningCert(crypt,cert);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Exit;
  end;

// Indicate that SHA-256 should be used.
CkCrypt2_putHashAlgorithm(crypt,'sha256');

// Specify the signed attributes to be included.
// (This is what makes it CAdES-BES compliant.)
jsonSignedAttrs := CkJsonObject_Create();
CkJsonObject_UpdateInt(jsonSignedAttrs,'contentType',1);
CkJsonObject_UpdateInt(jsonSignedAttrs,'signingTime',1);
CkJsonObject_UpdateInt(jsonSignedAttrs,'messageDigest',1);
CkJsonObject_UpdateInt(jsonSignedAttrs,'signingCertificateV2',1);
CkCrypt2_putSigningAttributes(crypt,CkJsonObject__emit(jsonSignedAttrs));

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

// Create the CAdES-BES signature, which contains the original data.
success := CkCrypt2_CreateP7M(crypt,inFile,sigFile);
if (success = False) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Exit;
  end;

// Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
encryptCert := CkCert_Create();
success := CkCert_LoadFromFile(encryptCert,'qa_data/certs/fatturapa_cert.pem');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCert__lastErrorText(encryptCert));
    Exit;
  end;

CkCrypt2_putCryptAlgorithm(crypt,'pki');

success := CkCrypt2_SetEncryptCert(crypt,encryptCert);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Exit;
  end;

// Indicate the underlying bulk encryption algorithm to be used:
CkCrypt2_putPkcs7CryptAlg(crypt,'aes');
CkCrypt2_putKeyLength(crypt,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 True to
// use RSAES_OAEP.  (We'll leave it set at the default value of False)
CkCrypt2_putOaepPadding(crypt,False);

// 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 := CkCrypt2_CkEncryptFile(crypt,sigFile,'qa_output/signed_and_encrypted.p7m');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCrypt2__lastErrorText(crypt));
    Exit;
  end;

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

CkCrypt2_Dispose(crypt);
CkCert_Dispose(cert);
CkJsonObject_Dispose(jsonSignedAttrs);
CkCert_Dispose(encryptCert);

end;