function EncryptoBin(secret, crypto) {
  this.put = function put(data, cb) {
    if (!cb)
      cb = function() {};

    jQuery.ajax(
      {type: "PUT",
       url: "/" + secret,
       data: crypto.encrypt(data),
       contentType: "text/plain",
       success: function(data) { cb(data); },
       error: function() { cb(null); }}
    );
  };

  this.get = function get(cb) {
    jQuery.ajax(
      {type: "GET",
       url: "/" + secret,
       success: function(data) { cb(crypto.decrypt(data)); },
       error: function() { cb(null); }}
    );
  };
}

function AESCrypto(password, bits) {
  this.encrypt = function AESEncrypt(data) {
    return AESEncryptCtr(data, password, bits);
  };

  this.decrypt = function AESDecrypt(data) {
    return AESDecryptCtr(data, password, bits);
  };
}

$(window).ready(
  function() {
    var BITS = 256;
    if ($("#password").val()) {
      var crypto = new AESCrypto($("#password").val(), BITS);
      var bin = new EncryptoBin(window.location.hash.slice(1),
                                crypto);

      bin.get(
        function(data) { $("#plaintext").val(data); }
      );

      $("#plaintext").blur(
        function commitChanges() {
          bin.put($("#plaintext").val());
        });
    }
  });