Dart

Create ICP-Brasil Compliant CMS Signature

See more CAdES Examples

Demonstrates how to create a .p7s signature that contains a data file, which in this case is a PDF. The .p7s will be compliant with the ICP-Brazil Digital Signature Standard.

The .p7s file created by this example can be verified at ICP-Brasil Online Verifier

Dart

import 'package:chilkat/chilkat.dart';

void main() {
  // This example requires the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  // ------------------------------------------------------------------------------------------------------
  // Note: This example creates a CMS signature (.p7s) that contains the PDF.
  // It is different than signing a PDF.  To sign a PDF where the resulting PDF contains the CMS signature,
  // see this example:  Sign PDF for ICP-Brasil
  // ------------------------------------------------------------------------------------------------------
  final crypt = CkCrypt2();

  // Any type of file can be signed.  It doesn't have to be a PDF.
  final inFile = 'qa_data/pdf/helloWorld.pdf';

  final bd = CkBinData();
  try {
    bd.loadFile(inFile);
  } on ChilkatException {
    print('Failed to load $inFile');
    return;
  }

  // We'll be using a certificate w/ private key stored on a smartcard for signing.
  final cert = CkCert();

  // If the smartcard or token requires a PIN, we can set it here to avoid the dialog...
  cert.smartCardPin = '000000';

  try {
    cert.loadFromSmartcard('');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Tell the crypt component to use this cert.
  try {
    crypt.setSigningCert(cert);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Set properties for signing...
  crypt.hashAlgorithm = 'sha256';

  final jsonSigningAttrs = CkJsonObject();
  jsonSigningAttrs.updateInt('contentType', 1);
  jsonSigningAttrs.updateInt('signingTime', 1);
  jsonSigningAttrs.updateInt('messageDigest', 1);
  jsonSigningAttrs.updateBool('signingCertificateV2', true);

  // Listed here are the currently existing profiles. (Chilkat will add additional ICP Brasil policy profiles in future versions as new ones are created.)
  // See https://www.gov.br/iti/pt-br/assuntos/repositorio/artefatos-de-assinatura-digital for more information.
  // 
  // PA_AD_RA --> 2.16.76.1.7.1.5.1
  // PA_AD_RA_v1_1 --> 2.16.76.1.7.1.5.1.1
  // PA_AD_RA_v1_2 --> 2.16.76.1.7.1.5.1.2
  // PA_AD_RA_v2_0 --> 2.16.76.1.7.1.5.2
  // PA_AD_RA_v2_1 --> 2.16.76.1.7.1.5.2.1
  // PA_AD_RA_v2_2 --> 2.16.76.1.7.1.5.2.2
  // PA_AD_RA_v2_3 --> 2.16.76.1.7.1.5.2.3
  // PA_AD_RA_v2_4 --> 2.16.76.1.7.1.5.2.4
  // PA_AD_RB --> 2.16.76.1.7.1.1.1
  // PA_AD_RB_v1_1 --> 2.16.76.1.7.1.1.1.1
  // PA_AD_RB_v2_0 --> 2.16.76.1.7.1.1.2
  // PA_AD_RB_v2_1 --> 2.16.76.1.7.1.1.2.1
  // PA_AD_RB_v2_2 --> 2.16.76.1.7.1.1.2.2
  // PA_AD_RB_v2_3 --> 2.16.76.1.7.1.1.2.3
  // PA_AD_RC --> 2.16.76.1.7.1.4.1
  // PA_AD_RC_v1_1 --> 2.16.76.1.7.1.4.1.1
  // PA_AD_RC_v2_0 --> 2.16.76.1.7.1.4.2
  // PA_AD_RC_v2_1 --> 2.16.76.1.7.1.4.2.1
  // PA_AD_RC_v2_2 --> 2.16.76.1.7.1.4.2.2
  // PA_AD_RC_v2_3 --> 2.16.76.1.7.1.4.2.3
  // PA_AD_RT --> 2.16.76.1.7.1.2.1
  // PA_AD_RT_v1_1 --> 2.16.76.1.7.1.2.1.1
  // PA_AD_RT_v2_0 --> 2.16.76.1.7.1.2.2
  // PA_AD_RT_v2_1 --> 2.16.76.1.7.1.2.2.1
  // PA_AD_RT_v2_2 --> 2.16.76.1.7.1.2.2.2
  // PA_AD_RT_v2_3 --> 2.16.76.1.7.1.2.2.3
  // PA_AD_RV --> 2.16.76.1.7.1.3.1
  // PA_AD_RV_v1_1 --> 2.16.76.1.7.1.3.1.1
  // PA_AD_RV_v2_0 --> 2.16.76.1.7.1.3.2
  // PA_AD_RV_v2_1 --> 2.16.76.1.7.1.3.2.1
  // PA_AD_RV_v2_2 --> 2.16.76.1.7.1.3.2.2
  // PA_AD_RV_v2_3 --> 2.16.76.1.7.1.3.2.3

  // Set the policy OID and the profile name
  jsonSigningAttrs.updateString('policyId.id', '2.16.76.1.7.1.1.2.3');
  jsonSigningAttrs.updateString('policyId.profile', 'PA_AD_RB_v2_3');

  crypt.signingAttributes = jsonSigningAttrs.emit();

  // The Brazil government validator requires the ASN.1 data to be in "constructed octets" form..
  crypt.uncommonOptions = 'UseConstructedOctets,OmitAlgorithmIdNull';
  crypt.includeCertChain = false;

  // Sign. 
  try {
    crypt.opaqueSignBd(bd);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Save to a .p7s
  bd.writeFile('qa_output/helloWorld.pdf.p7s');

  print('Success');
}