js与C#实现CBC模式的DES加解密

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转载于:https://www.jianshu.com/p/2129dbfd8c57

js与C#实现CBC模式的DES加解密

 

DES的加密模式具体可以参照DES算法的几种加密模式和填补方式

来看代码

前端部分：

js引入的是crypto-js，具体函数如下：

    // 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) {//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 ciphertextvar 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);}

引入的CryptoJS 模块有core.js、cipher-core.js以及tripledes.js
由于后台选用的C#加密方式加密出来的字符串是Base64模式的，所以前端加密前需要将十六进制字符串转为base64，这里我用到了Heron-Chogori博主的方法，具体代码如下

//十六进制字符串转为base64function sha1_to_base64(sha1)
{var digits="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";var base64_rep = "";var cnt = 0;var bit_arr = 0;var bit_num = 0;  for(var n = 0; n < sha1.length; ++n){if(sha1[n] >= 'A' && sha1[n] <= 'Z'){ascv = sha1.charCodeAt(n) - 55;}else if(sha1[n] >= 'a' && sha1[n] <= 'z'){ascv = sha1.charCodeAt(n) - 87;}else{ascv = sha1.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;
}

C#部分

使用的是Chen Jian博主的方法，代码如下：

 /// <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){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){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;}}

基本实现了前端加密出的字符串与后台解密出的一致。
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