Export a Public Key as DER into a BinData

Demonstrates the Chilkat PublicKey.GetDerBd method, which writes the public key as binary DER into a BinData. The first argument selects the representation (as for GetPem) and the second is the BinData that receives the bytes (its contents are replaced).

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 { BinData, PublicKey } from '@chilkat/react-native'

function chilkatExample() {
  // Load a public key to export.  LoadFromFile inspects the content, so it accepts DER, PEM, XML,
  // JWK, and other supported representations.
  const pubKey = new PublicKey();
  try {
    pubKey.loadFromFile('qa_data/public.pem');
  } catch {
    console.log(pubKey.lastErrorText);
    return;
  }

  // Write the public key as binary DER into a BinData.  The 1st argument selects the representation
  // (as for GetPem) and the 2nd is the BinData that receives the bytes (its contents are replaced).
  const preferPkcs1 = false;
  const bd = new BinData();
  try {
    pubKey.getDerBd(preferPkcs1, bd);
  } catch {
    console.log(pubKey.lastErrorText);
    return;
  }

  console.log(`Exported ${bd.numBytes} DER bytes.`);
}