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 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);
    }

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base64
       function 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：

 /// 

        /// DES加密字符串
        /// 
        /// 待加密的字符串
        /// 加密密钥,要求为8位
        /// 加密成功返回加密后的字符串，失败返回源串
        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;
            }
        }

        /// 

        /// DES解密字符串
        /// 
        /// 待解密的字符串
        /// 解密密钥,要求为8位,和加密密钥相同
        /// 解密成功返回解密后的字符串，失败返源串
        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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