Java实现的RSA加密解密算法示例

本文实例讲述了Java实现的RSA 加密解密算法。分享给大家供大家参考，具体如下：

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import java.awt.AlphaComposite;

import java.awt.Color;

import java.awt.Font;

import java.awt.Graphics2D;

import java.awt.Image;

import java.awt.RenderingHints;

import java.awt.image.BufferedImage;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.security.Key;

import java.security.KeyPair;

import java.security.KeyPairGenerator;

import java.security.SecureRandom;

import java.security.interfaces.RSAPrivateKey;

import java.security.interfaces.RSAPublicKey;

import javax.crypto.Cipher;

public class RSAUtils{

public static String makekeyfile(String pubkeyfile, String prikeyfile) {

String result = "生成公私钥文件失败";

try{

// KeyPairGenerator用于生成公私钥对，基于RSA算法生成对象

KeyPairGenerator gen = KeyPairGenerator.getInstance("RSA");

// 初始化密钥对生成器，密钥大小为1024位

gen.initialize(1024);

// //生成强随机数

// SecureRandom random = new SecureRandom();

// gen.initialize(1024,random);

// 生成一个密钥对，保存在pair中

KeyPair pair = gen.generateKeyPair();

// 得到私钥

RSAPrivateKey priKey = (RSAPrivateKey) pair.getPrivate();

// 得到公钥

RSAPublicKey pubKey = (RSAPublicKey) pair.getPublic();

// 生成私钥文件

ObjectOutputStream os = new ObjectOutputStream(new FileOutputStream(prikeyfile));

os.writeObject(priKey);

os.flush();

os.close();

//生成公钥文件

os = new ObjectOutputStream(new FileOutputStream(pubkeyfile));

os.writeObject(pubKey);

os.flush();

os.close();

result = "生成公钥文件【"+pubkeyfile+"】生成私钥文件【"+prikeyfile+"】";

}catch(Exception e){

e.printStackTrace();

}

return result;

}

public static void main(String[] args) {

try{

String pubfile = "F:/images/pub.key";

String prifile = "F:/images/pri.key";

String result = null;

//result = makekeyfile(pubfile, prifile);

result = markPuPra(pubfile, prifile);

System.out.println(result);

}catch(Exception e){

e.printStackTrace();

}

public static String markPuPra(String pubfile,String prifile){

String results = "加解密出错";

try{

ObjectInputStream os = new ObjectInputStream(new FileInputStream(pubfile));

RSAPublicKey pubkey = (RSAPublicKey) os.readObject();

os.close();

os = new ObjectInputStream(new FileInputStream(prifile));

RSAPrivateKey prikey = (RSAPrivateKey) os.readObject();

os.close();

String utf = "UTF-8";

String msg = "##中国%%的）人@+_";

// 使用公钥加密私钥解密

System.out.println("原文: " + msg);

byte[] puk = handleData(pubkey, msg.getBytes(utf), 1);

System.out.println("加密后文件数据: " + new String(puk, utf));

byte[] dpuk = handleData(prikey, puk, 0);

System.out.println("解密后文件数据: " + new String(dpuk, utf));

msg = "jd#我0们的￥人+=#新";

// 使用私钥加密公钥解密

System.out.println("原文: " + msg);

byte[] prk = handleData(prikey, msg.getBytes(utf), 1);

System.out.println("加密后文件数据: " + new String(prk, utf));

byte[] dprk = handleData(pubkey, prk, 0);

System.out.println("解密后文件数据: " + new String(dprk, utf));

results = "加解密完成";

}catch(Exception e){

e.printStackTrace();

}

return results;

}

/**

*

* @param k

* @param data

* @param encrypt 1 加密 0解密

* @return

* @throws Exception

*/

public static byte[] handleData(Key key, byte[] data, int type) throws Exception {

if (key != null) {

Cipher ci = Cipher.getInstance("RSA");

if (type == 1) {

ci.init(Cipher.ENCRYPT_MODE, key);

byte[] res = ci.doFinal(data);

return res;

}

if (type == 0) {

ci.init(Cipher.DECRYPT_MODE, key);

byte[] res = ci.doFinal(data);

return res;

}

return null;

}

希望本文所述对大家java程序设计有所帮助。

原文链接：http://blog.csdn.net/cnsd_liuliu/article/details/52474062

Java实现的RSA加密解密算法示例

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