这里有新鲜出炉的Java设计模式,程序狗速度看过来!
java 是一种可以撰写跨平台应用软件的面向对象的程序设计语言,是由Sun Microsystems公司于1995年5月推出的Java程序设计语言和Java平台(即JavaEE(j2ee), JavaME(j2me), JavaSE(j2se))的总称。
下面小编就为大家带来一篇RSA加密算法java简单实现方法(必看)。小编觉得挺不错的,现在就分享给大家,也给大家做个参考。一起跟随小编过来看看吧
简单完整的代码,通过这个代码你将对RSA加密算法在Java中的实现方法有一个初步的了解,这个类,你可以直接使用,水平高的,就自己修改完善下代码。
- package security;
- import java.security. * ;
- import java.security.spec. * ;
- import java.security.interfaces. * ;
- import javax.crypto.spec. * ;
- import javax.crypto.interfaces. * ;
- import java.io. * ;
- import java.math. * ;
- public class RSADemo {
- public RSADemo() {}
- public static void generateKey() {
- try {
- KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");
- kpg.initialize(1024);
- KeyPair kp = kpg.genKeyPair();
- PublicKey pbkey = kp.getPublic();
- PrivateKey prkey = kp.getPrivate();
- // 保存公钥
- FileOutputStream f1 = new FileOutputStream("pubkey.dat");
- ObjectOutputStream b1 = new ObjectOutputStream(f1);
- b1.writeObject(pbkey);
- // 保存私钥
- FileOutputStream f2 = new FileOutputStream("privatekey.dat");
- ObjectOutputStream b2 = new ObjectOutputStream(f2);
- b2.writeObject(prkey);
- } catch(Exception e) {}
- }
- public static void encrypt() throws Exception {
- String s = "Hello World!";
- // 获取公钥及参数e,n
- FileInputStream f = new FileInputStream("pubkey.dat");
- ObjectInputStream b = new ObjectInputStream(f);
- RSAPublicKey pbk = (RSAPublicKey) b.readObject();
- BigInteger e = pbk.getPublicExponent();
- BigInteger n = pbk.getModulus();
- System.out.println("e= " + e);
- System.out.println("n= " + n);
- // 获取明文m
- byte ptext[] = s.getBytes("UTF-8");
- BigInteger m = new BigInteger(ptext);
- // 计算密文c
- BigInteger c = m.modPow(e, n);
- System.out.println("c= " + c);
- // 保存密文
- String cs = c.toString();
- BufferedWriter out = new BufferedWriter(new OutputStreamWriter(new FileOutputStream("encrypt.dat")));
- out.write(cs, 0, cs.length());
- out.close();
- }
- public static void decrypt() throws Exception {
- // 读取密文
- BufferedReader in =new BufferedReader(new InputStreamReader(new FileInputStream("encrypt.dat")));
- String ctext = in.readLine();
- BigInteger c = new BigInteger(ctext);
- // 读取私钥
- FileInputStream f = new FileInputStream("privatekey.dat");
- ObjectInputStream b = new ObjectInputStream(f);
- RSAPrivateKey prk = (RSAPrivateKey) b.readObject();
- BigInteger d = prk.getPrivateExponent();
- // 获取私钥参数及解密
- BigInteger n = prk.getModulus();
- System.out.println("d= " + d);
- System.out.println("n= " + n);
- BigInteger m = c.modPow(d, n);
- // 显示解密结果
- System.out.println("m= " + m);
- byte[] mt = m.toByteArray();
- System.out.println("PlainText is ");
- for (int i = 0; i < mt.length; i++) {
- System.out.print((char) mt[i]);
- }
- }
- public static void main(String args[]) {
- try {
- generateKey();
- encrypt();
- decrypt();
- } catch(Exception e) {
- System.out.println(e.toString());
- }
- }
- }
以上这篇RSA加密算法java简单实现方法(必看)就是小编分享给大家的全部内容了,希望能给大家一个参考,也希望大家多多支持PHPERZ。
来源: http://www.phperz.com/article/17/1118/359946.html