AES:高级加密标准 ( Advanced Encryption Standard )
AES是一种对称加密算法:加密需要密钥,且加密密钥和解密密钥相同
下面是AES加密的Node实现:
"use strict"; const crypto = require("crypto"); //封装使用AES加密的方法 function aesEncrept(data, key){
//实例化一个cipher加密对象,使用aes192进行加密,key作为密钥 const cipher = crypto.createCipher("aes192",key);
//使用cipher对data进行加密,源数据类型为utf-8,输出数据类型为hex let crypted = cipher.update(data, "utf-8", "hex"); crypted += cipher.final("hex");
return crypted; } //封装对应的AES解密方法 function aesDecrept(encrepted, key) {
//实例化一个decipher解密对象,使用aes192进行解密,key作为密钥 const decipher = crypto.createDecipher("aes192", key);
//使用decipher对encrepted进行解密,源数据类型为hex,输出数据类型为utf-8 let decrypted = decipher.update(encrepted, "hex", "utf-8"); decrypted += decipher.final("utf-8");
return decrypted; } //需要加密的数据 let data = "This is what needs to be encrepted";
//AES加密的密钥 let keyword = "This is the key";
//使用自定义的aesEncrept方法进行加密 let encrepted = aesEncrept(data, keyword);
//使用自定义的aesDecrept方法对加密数据进行解密 let decrepted = aesDecrept(encrepted, keyword); console.log( "原始数据:" + data ); console.log( "经AES加密后:" + encrepted ); console.log( "经相应的解密后:" + decrepted );
注:
1.update方法只能对源数据的前16位进行加密,对加密数据的前32位进行解密;
2.final方法就是解决上面的缺陷,可以对剩余的数据进行加密/解密;
所以才有了下面的这个写法:
let decrypted = decipher.update(encrepted, "hex", "utf8");
decrypted += decipher.final("utf-8");
目的就是为了对全部的数据进行加密/解密
3.AES加密算法除了aes192
外,还有aes-128-ecb
,aes-256-cbc
等
拓展阅读:AES加密算法的详细介绍与实现
来源:CSDN
作者:TimeShatter