code: @Override
      public boolean compareSignedTokens(String tokenA, String tokenB) {
          String a = extractSignedToken(tokenA);
          String b = extractSignedToken(tokenB);
          return a != null && b != null && constantTimeEquals(a, b);
      }
docs: Compares two signed tokens.
  
  @param tokenA the first token
  @param tokenB the second token
  @return {@code true} if the tokens are equals, {@code false} otherwise