Java实现RSA算法的方法详解_Java教程

本文实例讲述了java实现rsa算法的方法。分享给大家供大家参考，具体如下：

一介绍

唯一广泛接受并实现
用于数据加密和数字签名
公钥加密、私钥解密
私钥加密、公钥解密

二 rsa参数说明

Java实现RSA算法的方法详解

三实现

									package com.imooc.security.rsa;

									import java.security.keyfactory;

									import java.security.keypair;

									import java.security.keypairgenerator;

									import java.security.privatekey;

									import java.security.publickey;

									import java.security.interfaces.rsaprivatekey;

									import java.security.interfaces.rsapublickey;

									import java.security.spec.pkcs8encodedkeyspec;

									import java.security.spec.x509encodedkeyspec;

									import javax.crypto.cipher;

									import org.apache.commons.codec.binary.base64;

									public class imoocrsa {

									  private static string src = "cakin24 security rsa";

									  public static void main(string[] args) {

									    jdkrsa();

									  }

									  public static void jdkrsa() {

									    try {

									      //1.初始化密钥

									      keypairgenerator keypairgenerator = keypairgenerator.getinstance("rsa");

									      keypairgenerator.initialize(512);

									      keypair keypair = keypairgenerator.generatekeypair();

									      rsapublickey rsapublickey = (rsapublickey)keypair.getpublic();

									      rsaprivatekey rsaprivatekey = (rsaprivatekey)keypair.getprivate();

									      system.out.println("public key : " + base64.encodebase64string(rsapublickey.getencoded()));

									      system.out.println("private key : " + base64.encodebase64string(rsaprivatekey.getencoded()));

									      //2.私钥加密、公钥解密——加密

									      pkcs8encodedkeyspec pkcs8encodedkeyspec = new pkcs8encodedkeyspec(rsaprivatekey.getencoded());

									      keyfactory keyfactory = keyfactory.getinstance("rsa");

									      privatekey privatekey = keyfactory.generateprivate(pkcs8encodedkeyspec);

									      cipher cipher = cipher.getinstance("rsa");

									      cipher.init(cipher.encrypt_mode, privatekey);

									      byte[] result = cipher.dofinal(src.getbytes());

									      system.out.println("私钥加密、公钥解密——加密 : " + base64.encodebase64string(result));

									      //3.私钥加密、公钥解密——解密

									      x509encodedkeyspec x509encodedkeyspec = new x509encodedkeyspec(rsapublickey.getencoded());

									      keyfactory = keyfactory.getinstance("rsa");

									      publickey publickey = keyfactory.generatepublic(x509encodedkeyspec);

									      cipher = cipher.getinstance("rsa");

									      cipher.init(cipher.decrypt_mode, publickey);

									      result = cipher.dofinal(result);

									      system.out.println("私钥加密、公钥解密——解密：" + new string(result));

									      //4.公钥加密、私钥解密——加密

									      x509encodedkeyspec = new x509encodedkeyspec(rsapublickey.getencoded());

									      keyfactory = keyfactory.getinstance("rsa");

									      publickey = keyfactory.generatepublic(x509encodedkeyspec);

									      cipher = cipher.getinstance("rsa");

									      cipher.init(cipher.encrypt_mode, publickey);

									      result = cipher.dofinal(src.getbytes());

									      system.out.println("公钥加密、私钥解密——加密 : " + base64.encodebase64string(result));

									      //5.公钥加密、私钥解密——解密

									      pkcs8encodedkeyspec = new pkcs8encodedkeyspec(rsaprivatekey.getencoded());

									      keyfactory = keyfactory.getinstance("rsa");

									      privatekey = keyfactory.generateprivate(pkcs8encodedkeyspec);

									      cipher = cipher.getinstance("rsa");

									      cipher.init(cipher.decrypt_mode, privatekey);

									      result = cipher.dofinal(result);

									      system.out.println("公钥加密、私钥解密——解密：" + new string(result));

									    } catch (exception e) {

									      e.printstacktrace();

									    }

									  }

									}

四实现效果

public key : mfwwdqyjkozihvcnaqebbqadswawsajbajcbeob97idkkirbmx3moy5e4erwh0uvc2bcnly1rdo0lz8ibr1bl1rjxwkhv7u0aso/5dblnnngbqrtsjlscpmcaweaaq==
private key : miibvaibadanbgkqhkig9w0baqefaascat4wgge6ageaakealwf45v3sh2ssksgbhcw5jl7h5hchs68lyfw2vjwsojsvnyjthvuxveldaqe/ttqbi7/kmgweecztbg2wmwwi8widaqabakadskprsl+ew3s2n+cemizxfyyb0xhs1d84qapafpixkunvwl0a4ovrwsnwt4mejatwvtufnvtxizczdx+q5dbbaiea9tzzymgru+3mdlax0icf+niqwvlqyvedka4ksx55gvuciqcdoex6mqgrp78aqjykweogwliszju5fn/lfvkzrcgbjwihamvbblzzaykhy0ikw75kd/lksyouty+20bap+midrqgzaia6r36eerkzqubtcl8lxypb5f79htxd5dcvnib/zgp0uwigwtxi7ixhjycsnomsjdu1j3du9kqquw/eohxrk/oguye=
私钥加密、公钥解密——加密 : vjkfsoivelvkes5rprhsjk9tdtzohdells7yluidcyee7dkucm9srj8kwadynhi4m0olafjhk6447hp7ia8x7a==
私钥加密、公钥解密——解密：cakin24 security rsa
公钥加密、私钥解密——加密 : gawl73uxhto+efkkpmfmdhtk0vh7hb8n+30l1hp8aamiagd21h2x/q/ns+sogsoxnovunzasgzenmzzcjb4vea==
公钥加密、私钥解密——解密：cakin24 security rsa

五应用场景

Java实现RSA算法的方法详解