com.iterzp.momo.utils.RSAUtils.java Source code

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Here is the source code for com.iterzp.momo.utils.RSAUtils.java

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/*
 * Copyright 2005-2013 iterzp.com. All rights reserved.
 * Support: http://www.iterzp.com
 * License: http://www.iterzp.com/license
 */
package com.iterzp.momo.utils;

import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.Provider;
import java.security.PublicKey;
import java.security.SecureRandom;

import javax.crypto.Cipher;

import org.apache.commons.codec.binary.Base64;
import org.bouncycastle.jce.provider.BouncyCastleProvider;
import org.springframework.util.Assert;

/**
 * Utils - RSA
 * 
 * @author yd14 Team
 * @version 3.0
 */
public final class RSAUtils {

    /** ??? */
    private static final Provider PROVIDER = new BouncyCastleProvider();

    /** ? */
    private static final int KEY_SIZE = 1024;

    /**
     * ??
     */
    private RSAUtils() {
    }

    /**
     * ?
     * 
     * @return 
     */
    public static KeyPair generateKeyPair() {
        try {
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA", PROVIDER);
            keyPairGenerator.initialize(KEY_SIZE, new SecureRandom());
            return keyPairGenerator.generateKeyPair();
        } catch (NoSuchAlgorithmException e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 
     * 
     * @param publicKey
     *            
     * @param data
     *            ?
     * @return ??
     */
    public static byte[] encrypt(PublicKey publicKey, byte[] data) {
        Assert.notNull(publicKey);
        Assert.notNull(data);
        try {
            Cipher cipher = Cipher.getInstance("RSA", PROVIDER);
            cipher.init(Cipher.ENCRYPT_MODE, publicKey);
            return cipher.doFinal(data);
        } catch (Exception e) {
            e.printStackTrace();
            return null;
        }
    }

    /**
     * 
     * 
     * @param publicKey
     *            
     * @param text
     *            
     * 
     * @return Base64?
     */
    public static String encrypt(PublicKey publicKey, String text) {
        Assert.notNull(publicKey);
        Assert.notNull(text);
        byte[] data = encrypt(publicKey, text.getBytes());
        return data != null ? Base64.encodeBase64String(data) : null;
    }

    /**
     * 
     * 
     * @param privateKey
     *            ?
     * @param data
     *            ?
     * @return ??
     */
    public static byte[] decrypt(PrivateKey privateKey, byte[] data) {
        Assert.notNull(privateKey);
        Assert.notNull(data);
        try {
            Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding", PROVIDER);
            cipher.init(Cipher.DECRYPT_MODE, privateKey);
            return cipher.doFinal(data);
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * 
     * 
     * @param privateKey
     *            ?
     * @param text
     *            Base64?
     * @return ??
     */
    public static String decrypt(PrivateKey privateKey, String text) {
        Assert.notNull(privateKey);
        Assert.notNull(text);
        byte[] data = decrypt(privateKey, Base64.decodeBase64(text));
        return data != null ? new String(data) : null;
    }

}