openpgp_deterministic_key.worker.js

gistfile1.js

importScripts('openpgp.worker.js');
importScripts('scrypt.js');

var generateKeyPair = window.openpgp.generateKeyPair;

window.openpgp.generateKeyPair = function(options) {
  var scrypt = scrypt_module_factory(33554432);
  var utf8_pwd = scrypt.encode_utf8(options.receipt);
  var salt = options.salt;

  var offset = 0;
  var seed = scrypt.crypto_scrypt(utf8_pwd, salt, 4096, 8, 1, 128 * 2);

  function getDeterministicRandomOctet() {
    return seed[offset++ % seed.length];
  }

  window.openpgp.crypto.random.getSecureRandomOctet = getDeterministicRandomOctet;

  return generateKeyPair(options);
}