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
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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();
}
}
}
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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
希望本文所述对大家java程序设计有所帮助。
原文链接：https://blog.csdn.net/chengqiuming/article/details/78755050