Pascal (Lazarus/Delphi)

FatturaPA XML Invoice Sign+Encrypt to P7M

See more Digital Signatures Examples

Demonstrates how to create a CAdES BES signed + encrypted invoice.xml.p7m for the Italian FatturaPA exchange system. Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Cert,
  Chilkat.JsonObject,
  Chilkat.Crypt2;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  crypt: TCrypt2;
  pfxPath: string;
  pfxPassword: string;
  cert: TCert;
  jsonSignedAttrs: TJsonObject;
  inFile: string;
  sigFile: string;
  encryptCert: TCert;

begin
  success := False;

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

  crypt := TCrypt2.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 := TCert.Create;
  success := cert.LoadPfxFile(pfxPath,pfxPassword);
  if (success = False) then
    begin
      WriteLn(cert.LastErrorText);
      Exit;
    end;

  //  Provide the signing cert (with associated private key).
  success := crypt.SetSigningCert(cert);
  if (success = False) then
    begin
      WriteLn(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 := TJsonObject.Create;
  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 = False) then
    begin
      WriteLn(crypt.LastErrorText);
      Exit;
    end;

  //  Now we'll encrypt what was signed using FatturaPA's certificate (from a PEM file)
  encryptCert := TCert.Create;
  success := encryptCert.LoadFromFile('qa_data/certs/fatturapa_cert.pem');
  if (success = False) then
    begin
      WriteLn(encryptCert.LastErrorText);
      Exit;
    end;

  crypt.CryptAlgorithm := 'pki';

  success := crypt.SetEncryptCert(encryptCert);
  if (success = False) then
    begin
      WriteLn(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 True to
  //  use RSAES_OAEP.  (We'll leave it set at the default value of False)
  crypt.OaepPadding := 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 := crypt.CkEncryptFile(sigFile,'qa_output/signed_and_encrypted.p7m');
  if (success = False) then
    begin
      WriteLn(crypt.LastErrorText);
      Exit;
    end;

  WriteLn('Success.');


  crypt.Free;
  cert.Free;
  jsonSignedAttrs.Free;
  encryptCert.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.