Create an Opaque Signature with a Separate Private Key

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Demonstrates the Chilkat Mime.ConvertToSignedPk method, which creates an opaque signature using a signer certificate and its separately supplied private key. The first argument is the Cert and the second is the PrivateKey.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

import { Cert, Mime, PrivateKey } from '@chilkat/react-native'

function chilkatExample() {
  const mime = new Mime();
  try {
    mime.setBodyFromPlainText('This message will be signed.');
  } catch {
    console.log(mime.lastErrorText);
    return;
  }

  // Load the certificate and its private key separately.
  const cert = new Cert();
  try {
    cert.loadFromFile('qa_data/signer.cer');
  } catch {
    console.log(cert.lastErrorText);
    return;
  }

  const privKey = new PrivateKey();
  try {
    privKey.loadPemFile('qa_data/signer_privkey.pem');
  } catch {
    console.log(privKey.lastErrorText);
    return;
  }

  // Create an opaque signature when the certificate and private key are supplied separately.  The
  // 1st argument is the signer certificate and the 2nd is its private key.
  try {
    mime.convertToSignedPk(cert, privKey);
  } catch {
    console.log(mime.lastErrorText);
    return;
  }

  try {
    mime.saveMime('qa_output/signed_opaque.eml');
  } catch {
    console.log(mime.lastErrorText);
    return;
  }

  console.log('Message converted to an opaque signed message.');
}