### Question:
RSAencryptionUtil { public byte[] decrypt(byte[] data, RSAPrivateKey privateKey) throws Exception{ return BasicEncryptionUtil.getInstance().decrypt(HelperHolder.ALGOROTHM_KEY,privateKey,data); } private  RSAencryptionUtil(); static RSAencryptionUtil getInstance(); Map<String, Object> initKey(); RSAPublicKey getpublicKey(Map<String, Object> keyMap); RSAPrivateKey getPrivateKey(Map<String, Object> keyMap); byte[] encrypt(byte[] data, RSAPublicKey publicKey); byte[] decrypt(byte[] data, RSAPrivateKey privateKey);  }### Answer:
@Test void decrypt() throws Exception { }