Dart Requires Chilkat v11.0.0+

RSA Encrypt Randomly Generated AES Key

See more RSA Examples

Demonstrates how to RSA encrypt a randomly generated AES key. 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.

  // First generate a 256-bit AES key (32 bytes).
  final prng = CkPrng();
  final bdAesKey = CkBinData();
  prng.genRandomBd(32, bdAesKey);

  // Use a public key from a certificate for RSA encryption.
  final cert = CkCert();

  try {
    cert.loadFromFile('qa_data/pem/mf_public_rsa.pem');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  final pubKey = CkPublicKey();
  cert.getPublicKey(pubKey);

  final rsa = CkRsa();
  try {
    rsa.usePublicKey(pubKey);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // RSA encrypt our 32-byte AES key.
  // The contents of bdAesKey are replaced with result of the RSA encryption.
  try {
    rsa.encryptBd(bdAesKey, false);
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Return the result as a base64 string
  final encryptedAesKey = bdAesKey.getEncoded('base64');

  print('encrypted AES key = $encryptedAesKey');
}