Java实现RSA算法的方法详解

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

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

ps：关于加密解密感兴趣的朋友还可以参考本站在线工具：

在线rsa加密/解密工具：

文字在线加密解密工具（包含aes、des、rc4等）：

md5在线加密工具:
http://tools.jb51.net/password/createmd5password

在线散列/哈希算法加密工具:

在线md5/hash/sha-1/sha-2/sha-256/sha-512/sha-3/ripemd-160加密工具：

在线sha1/sha224/sha256/sha384/sha512加密工具：

更多关于java相关内容感兴趣的读者可查看本站专题：《java数学运算技巧总结》、《java数据结构与算法教程》、《java字符与字符串操作技巧总结》、《java操作dom节点技巧总结》和《java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。