import javax.crypto.Cipher;

import java.security.*;

import java.security.spec.RSAPublicKeySpec;

import java.security.spec.RSAPrivateKeySpec;

import java.security.spec.InvalidKeySpecException;

import java.security.interfaces.RSAPrivateKey;

import java.security.interfaces.RSAPublicKey;

import java.io.*;

import java.math.BigInteger;

/**

* RSA utility class. Provide encryption, decryption, key generation and other methods.

* You need to go to /software_zone/2007/0925/523319.shtml

Refer to this again

/t/20040427/20/3014655.html