javascript JS CryptoJS DES加解密CBC模式与C#DES加解密相同互通

时间:2023-03-08 16:47:34
javascript JS CryptoJS DES加解密CBC模式与C#DES加解密相同互通

我们只知道不同的语言解密要相互通用,就需要遵循相同的加密方式,然而在具体做技术预研的时候,就发现会遇到很多问题,网上找的资料也是比较片面,所以我踩了坑,并且把解决方案和相关资料源码提供出来,给需要的朋友一些参考。

场景:网页客户端(html)页面通过在发起请求时,将数据加密发送给C#编写的后端。C#后端接受到数据后需要进行解密,解密后得到明文,用明文进行业务操作,操作完成后,将结果加密返回。

因为C#后端使用的是DES CBC模式,所以前端JS也要使用相同的方式。否则加密解密结果不以言,就无法互通了。

使用技术:

1.前端javascript 使用CryptoJS进行加解密。

2.使用System.Security.Cryptography 命名空间下的相关类。

前端核心代码:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>JS_DES加解密CBC模式与C#DES加解密相同互通</title>
<script type="text/javascript">
function CBCJiami() {
var key = $("#desKey").val();
var iv = $("#desIV").val();
var msg = $("#source").val();
var dd = encryptByDES(msg, key, iv);
$("#JiaMiHou").val(dd);
$("#target").val(toBase641(dd));
}
function CBCJiemi() {
var key = $("#desKey").val();
var iv = $("#desIV").val();
var msg = $("#JiaMiHou").val();
var dd = decryptByDESModeEBC(msg, key, iv);
$("#CBCJiemi").val(dd);
}
// DES CBC模式加密
//加密内容、秘钥、向量
function encryptByDES(message, key, iv) {
var keyHex = CryptoJS.enc.Utf8.parse(key);
var ivHex = CryptoJS.enc.Utf8.parse(iv);
encrypted = CryptoJS.DES.encrypt(message, keyHex, {
iv: ivHex,
mode: CryptoJS.mode.CBC,
padding: CryptoJS.pad.Pkcs7
}
);
return encrypted.ciphertext.toString();
}
//DES CBC模式解密
function decryptByDESModeEBC(ciphertext, key, iv) {
//把私钥转换成UTF - 8编码的字符串
var keyHex = CryptoJS.enc.Utf8.parse(key);
var ivHex = CryptoJS.enc.Utf8.parse(iv);
// direct decrypt ciphertext
var decrypted = CryptoJS.DES.decrypt({
ciphertext: CryptoJS.enc.Hex.parse(ciphertext)
}, keyHex, {
iv: ivHex,
mode: CryptoJS.mode.CBC,
padding: CryptoJS.pad.Pkcs7
});
return decrypted.toString(CryptoJS.enc.Utf8);
}
//十六进制字符串转为base64
function toBase641(input) {
var digits = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
var base64_rep = "";
var cnt = 0;
var bit_arr = 0;
var bit_num = 0;
for (var n = 0; n < input.length; ++n) {
if (input[n] >= 'A' && input[n] <= 'Z') {
ascv = input.charCodeAt(n) - 55;
}
else if (input[n] >= 'a' && input[n] <= 'z') {
ascv = input.charCodeAt(n) - 87;
}
else {
ascv = input.charCodeAt(n) - 48;
}
bit_arr = (bit_arr << 4) | ascv;
bit_num += 4;
if (bit_num >= 6) {
bit_num -= 6;
base64_rep += digits[bit_arr >>> bit_num];
bit_arr &= ~(-1 << bit_num);
}
}
if (bit_num > 0) {
bit_arr <<= 6 - bit_num;
base64_rep += digits[bit_arr];
}
var padding = base64_rep.length % 4;
if (padding > 0) {
for (var n = 0; n < 4 - padding; ++n) {
base64_rep += "=";
}
}
return base64_rep;
}
</script>
<script src="jquery-3.4.1.min.js"></script>
<script src="CryptoJS v3.1.2/rollups/tripledes.js"></script>
<script src="CryptoJS v3.1.2/components/mode-ecb-min.js"></script>
<script src="Base64Helper.js"></script>
</head>
<body>
<div>
<fieldset>
<legend>DES CBC模式加密</legend>
Key:<input type="text" id="desKey" value="z9j#$@4D">
<br />
IV:<input type="text" id="desIV" value="x34dg!df">
<br />
MSG:<input id="source" value="{}" />
<br />
<input type="button" onclick="CBCJiami();" name="" value="CBC加密" />
<br />
加密后:<input id="JiaMiHou" value="" />
<br />
转base64后:<input id="target" value="" />
<br />
<input type="button" onclick="CBCJiemi();" name="" value="CBC解密" />
<br />
解密后:<input id="CBCJiemi" value="" />
</fieldset>
</div>
</body>
</html>

后端核心代码:

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Security.Cryptography;
using System.Text;
using System.Threading.Tasks; namespace WindowsFormsTest
{
public class DESHelper
{
/// <summary>
/// DES加密字符串
/// </summary>
/// <param name="encryptString">待加密的字符串</param>
/// <param name="encryptKey">加密密钥,要求为8位</param>
/// <returns>加密成功返回加密后的字符串,失败返回源串</returns>
public static string EncryptDES(string encryptString, string encryptKey, string iv)
{
try
{
//将字符转换为UTF - 8编码的字节序列
byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
byte[] rgbIV = Encoding.UTF8.GetBytes(iv);
byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
//用指定的密钥和初始化向量创建CBC模式的DES加密标准
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
dCSP.Mode = CipherMode.CBC;
dCSP.Padding = PaddingMode.PKCS7;
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);//写入内存流
cStream.FlushFinalBlock();//将缓冲区中的数据写入内存流,并清除缓冲区
return Convert.ToBase64String(mStream.ToArray()); //将内存流转写入字节数组并转换为string字符
}
catch
{
return encryptString;
}
} /// <summary>
/// DES解密字符串
/// </summary>
/// <param name="decryptString">待解密的字符串</param>
/// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param>
/// <returns>解密成功返回解密后的字符串,失败返源串</returns>
public static string DecryptDES(string decryptString, string decryptKey, string iv)
{
try
{
//将字符转换为UTF - 8编码的字节序列
byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey.Substring(0, 8));
byte[] rgbIV = Encoding.UTF8.GetBytes(iv);
byte[] inputByteArray = Convert.FromBase64String(decryptString);
//用指定的密钥和初始化向量使用CBC模式的DES解密标准解密
DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
dCSP.Mode = CipherMode.CBC;
dCSP.Padding = PaddingMode.PKCS7;
MemoryStream mStream = new MemoryStream();
CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
cStream.Write(inputByteArray, 0, inputByteArray.Length);
cStream.FlushFinalBlock();
return Encoding.UTF8.GetString(mStream.ToArray());
}
catch
{
return decryptString;
} }
}
}

  运行效果:

javascript JS CryptoJS DES加解密CBC模式与C#DES加解密相同互通

javascript JS CryptoJS DES加解密CBC模式与C#DES加解密相同互通

 其中要注意一点:前端加密后有个转Base64的操作,加密解密后才会相同,原因是C#加密后的数据是转成base64的。

多说无益,直接上代码:

链接:https://pan.baidu.com/s/1FqpRa9LGuSfRZ9ZZ7Hau0g
提取码:hjvu

最后感谢网络上我参考过的文章、博客。有的代码是直接抄过来改的,参考太多无法一一列出,但要感谢他们无私精神。