code: function _sha1() {
    var sha = forge.md.sha1.create();
    var num = arguments.length;
    for (var i = 0; i < num; ++i) {
      sha.update(arguments[i]);
    }
    return sha.digest();
  }
docs: Hashes the arguments into one value using SHA-1.
  
  @return the sha1 hash of the provided arguments.