React Native Requires Chilkat v11.0.0+

RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature. React Native

import { Cert, CertStore, JsonObject, PrivateKey, Rsa } from '@chilkat/react-native'

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

  // Create an instance of a certificate store object, load a PFX file,
  // locate the certificate we need, and use it for signing.
  // (a PFX file may contain more than one certificate.)
  const certStore = new CertStore();

  // The 1st argument is the filename, the 2nd arg is the 
  // PFX file's password:
  try {
    certStore.loadPfxFile('chilkat.pfx', 'test');
  } catch {
    console.log(certStore.lastErrorText);
    return;
  }

  // Find the certificate by the subject common name:
  const jsonCN = new JsonObject();
  jsonCN.updateString('CN', 'cert common name');

  const cert = new Cert();
  try {
    certStore.findCert(jsonCN, cert);
  } catch {
    console.log(certStore.lastErrorText);
    return;
  }

  const privKey = new PrivateKey();
  try {
    cert.getPrivateKey(privKey);
  } catch {
    console.log(cert.lastErrorText);
    return;
  }

  const rsa = new Rsa();

  try {
    rsa.usePrivateKey(privKey);
  } catch {
    console.log(rsa.lastErrorText);
    return;
  }

  // Encode the signature as a hex string
  rsa.encodingMode = 'hex';

  const strData = 'This is the string to be signed.';

  // Sign the string using the sha-1 hash algorithm.
  // Other valid choices are "sha-256", "md2" and "md5".
  const hexSig = rsa.signStringENC(strData, 'sha-1');

  console.log(hexSig);

  console.log('Success!');
}