@Test
public void simple() throws IOException, NoSuchAlgorithmException, InvalidKeySpecException {

    RSAPrivateCrtKeySpec spec = PKCS1Util.decodePKCS1(Base64Util.decode(PRIVATE_KEY));
    assertNotNull(spec);
    assertEquals(new BigInteger("65537"),spec.getPublicExponent());
    assertEquals(new BigInteger("17219073728753538877351436880713775379656064037529658955194218882887990854659277" +
                                "14926866974743136717398950769494187526607437089900175320890853259761202632924910" +
                                "04313716240382424077365899979237567821238335068353270396753262938612364085446101" +
                                "06439976729028133029376341040827650031161824951684561808300496926367402762121624" +
                                "84716729598919532254889795000011013630896579601633649087197314473243762156761264" +
                                "28213494680134367573578684374434499094707511493610021020953064686646715594465961" +
                                "57768682849057097693703094001987209424161987563379538988444327461934240605326845" +
                                "582692396320855699767767177230708015442200422586240491997"),
                 spec.getPrivateExponent());
}