def _encrypt_password(self, raw_password):
          if isinstance(raw_password, unicode):
              raw_password = raw_password.encode('UTF-8')
          salt = sha1(os.urandom(60)).hexdigest()[:SALT_LENGTH]
          hash = sha1(raw_password + salt).hexdigest()
          salted_hash = salt + hash
          return salted_hash

      def validate_password(self, raw_password):
          salt = self.password[:SALT_LENGTH]
          hash = sha1(raw_password + salt).hexdigest()