React Native

Sign JSON to Create CAdES P7S Bytes

See more CAdES Examples

Demonstrates how to sign JSON using a certificate + private key from a .p12/.pfx to create a CAdES P7S byte array. React Native

import { Cert, Crypt2, JsonObject } from '@chilkat/react-native'

async function chilkatExample() {
  // This example assumes the Chilkat API to have been previously unlocked.
  // See Global Unlock Sample for sample code.

  const crypt = new Crypt2();

  const cert = new Cert();
  try {
    cert.loadPfxFile('qa_data/pfx/cert_test123.pfx', 'test123');
  } catch {
    console.log(cert.lastErrorText);
    return;
  }

  // Tell the crypt component to use this cert.
  try {
    crypt.setSigningCert(cert);
  } catch {
    console.log(crypt.lastErrorText);
    return;
  }

  // The CadesEnabled property applies to all methods that create PKCS7 signatures. 
  // To create a CAdES-BES signature, set this property equal to true. 
  crypt.cadesEnabled = true;

  crypt.hashAlgorithm = 'sha256';

  const jsonSigningAttrs = new JsonObject();
  jsonSigningAttrs.updateInt('contentType', 1);
  jsonSigningAttrs.updateInt('signingTime', 1);
  jsonSigningAttrs.updateInt('messageDigest', 1);
  jsonSigningAttrs.updateInt('signingCertificateV2', 1);
  crypt.signingAttributes = jsonSigningAttrs.emit();

  // By default, all the certs in the chain of authentication are included in the signature.
  // If desired, we can choose to only include the signing certificate:
  crypt.includeCertChain = false;

  // Create the CAdES-BES attached signature, which contains the original data.
  crypt.charset = 'utf-8';
  const cadesP7s = await crypt.opaqueSignStringAsync('{ "abc": 123}');
  if (!crypt.lastMethodSuccess) {
    console.log(crypt.lastErrorText);
    return;
  }

  // Verify the signature and extract the original JSON:
  let originalJson: string;
  try {
    originalJson = crypt.opaqueVerifyString(cadesP7s);
  } catch {
    console.log(crypt.lastErrorText);
    return;
  }

  console.log(`Original JSON: ${originalJson}`);

  console.log('Success!');
}