BlockCipher cfb = new CFBBlockCipher(new DESEngine(), 32);
cfb.init(true, new ParametersWithIV(key, Hex.decode("1122334455667788")));
cfb.processBlock(input, 0, out1, 0);
cfb.init(false, new ParametersWithIV(key, Hex.decode("1122334455667788")));
cfb.processBlock(out1, 0, out2, 0);
if (!isEqualTo(out2, input))