Function safeStringCompare

index.js:211–217

* Compares two strings of the same length in constant time. * @param {string} known Must be of the correct length * @param {string} unknown Must be the same length as `known` * @returns {boolean} * @inner

(known, unknown)

 * @inner
 */
function safeStringCompare(known, unknown) {
  var diff = known.length ^ unknown.length;
  for (var i = 0; i < known.length; ++i) {
    diff |= known.charCodeAt(i) ^ unknown.charCodeAt(i);
  }
  return diff === 0;
}

/**
 * Synchronously tests a password against a hash.