本文實例講述了java實現rsa算法的方法。分享給大家供大家參考，具體如下：
一 介紹
唯一廣泛接受并實現
用于數據加密和數字簽名
公鑰加密、私鑰解密
私鑰加密、公鑰解密
二 rsa參數說明
三 實現
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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.初始化密鑰 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.私鑰加密、公鑰解密——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("私鑰加密、公鑰解密——加密 : " + base64.encodebase64string(result)); //3.私鑰加密、公鑰解密——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("私鑰加密、公鑰解密——解密：" + new string(result)); //4.公鑰加密、私鑰解密——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("公鑰加密、私鑰解密——加密 : " + base64.encodebase64string(result)); //5.公鑰加密、私鑰解密——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("公鑰加密、私鑰解密——解密：" + new string(result)); } catch (exception e) { e.printstacktrace(); } }} |
四 實現效果
public key : mfwwdqyjkozihvcnaqebbqadswawsajbajcbeob97idkkirbmx3moy5e4erwh0uvc2bcnly1rdo0lz8ibr1bl1rjxwkhv7u0aso/5dblnnngbqrtsjlscpmcaweaaq==
private key : miibvaibadanbgkqhkig9w0baqefaascat4wgge6ageaakealwf45v3sh2ssksgbhcw5jl7h5hchs68lyfw2vjwsojsvnyjthvuxveldaqe/ttqbi7/kmgweecztbg2wmwwi8widaqabakadskprsl+ew3s2n+cemizxfyyb0xhs1d84qapafpixkunvwl0a4ovrwsnwt4mejatwvtufnvtxizczdx+q5dbbaiea9tzzymgru+3mdlax0icf+niqwvlqyvedka4ksx55gvuciqcdoex6mqgrp78aqjykweogwliszju5fn/lfvkzrcgbjwihamvbblzzaykhy0ikw75kd/lksyouty+20bap+midrqgzaia6r36eerkzqubtcl8lxypb5f79htxd5dcvnib/zgp0uwigwtxi7ixhjycsnomsjdu1j3du9kqquw/eohxrk/oguye=
私鑰加密、公鑰解密——加密 : vjkfsoivelvkes5rprhsjk9tdtzohdells7yluidcyee7dkucm9srj8kwadynhi4m0olafjhk6447hp7ia8x7a==
私鑰加密、公鑰解密——解密：cakin24 security rsa
公鑰加密、私鑰解密——加密 : gawl73uxhto+efkkpmfmdhtk0vh7hb8n+30l1hp8aamiagd21h2x/q/ns+sogsoxnovunzasgzenmzzcjb4vea==
公鑰加密、私鑰解密——解密：cakin24 security rsa
五 應用場景
希望本文所述對大家java程序設計有所幫助。
原文鏈接：https://blog.csdn.net/chengqiuming/article/details/78755050
