屬于對稱加密算法的是，C# 中用DES 對稱Key,IV 加密，前端crypto.js 解密

1.服務器端代碼

#region ========加密========
/// <summary>
/// 加密
/// </summary>
/// <param name="Text"></param>
/// <returns></returns>
public static string Encrypt(string Text)
{
return Encrypt(Text, DESKey);
}
/// <summary>
/// 加密數據
/// </summary>
/// <param name="Text"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public static string Encrypt(string Text, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
byte[] inputByteArray;
inputByteArray = Encoding.Default.GetBytes(Text);
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
System.IO.MemoryStream ms = new System.IO.MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
StringBuilder ret = new StringBuilder();
foreach (byte b in ms.ToArray())
{
ret.AppendFormat("{0:X2}", b); // {0:X2}大寫的十六進制
}
return ret.ToString();
}

屬于對稱加密算法的是。 #endregion

#region ========解密========
/// <summary>
/// 解密
/// </summary>
/// <param name="Text"></param>
/// <returns></returns>
public static string Decrypt(string Text)
{
if (!string.IsNullOrEmpty(Text))
{
return Decrypt(Text, DESKey);
}
else
{
return "";
}
}
/// <summary>
/// 解密數據
/// </summary>
/// <param name="Text"></param>
/// <param name="sKey"></param>
/// <returns></returns>
public static string Decrypt(string Text, string sKey)
{
DESCryptoServiceProvider des = new DESCryptoServiceProvider();
int len;
len = Text.Length / 2;
byte[] inputByteArray = new byte[len];
int x, i;
for (x = 0; x < len; x++)
{
i = Convert.ToInt32(Text.Substring(x * 2, 2), 16);
inputByteArray[x] = (byte)i;
}
des.Key = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
des.IV = ASCIIEncoding.ASCII.GetBytes(System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(sKey, "md5").Substring(0, 8));
System.IO.MemoryStream ms = new System.IO.MemoryStream();
CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(), CryptoStreamMode.Write);
cs.Write(inputByteArray, 0, inputByteArray.Length);
cs.FlushFinalBlock();
return Encoding.Default.GetString(ms.ToArray());
}

#endregion

js不可逆加密，2.前端?

encryptDes:function(input,key,iv){
              var cipher = crypto.createCipheriv('des', new Buffer(key), new Buffer(iv));
             var buf1 = cipher.update(input, 'utf8');
              var buf2 = cipher.final();
              var result = new Buffer(buf1.length + buf2.length);
              buf1.copy(result);
              buf2.copy(result, buf1.length);

              return result.toString('hex').toUpperCase();
             },
             decryptDes:function(encrypt_text,iv,key){
                                        var key = new Buffer(key);
                                        var iv = new Buffer(iv ? iv : 0);
                                        var decipher = crypto.createDecipheriv('des', key, iv);
                                        decipher.setAutoPadding(true);
                                        var txt = decipher.update(encrypt_text, 'hex', 'utf8');
                                        txt += decipher.final('utf8');
                                        return txt;
                                      },

Str2Bytes:function (str) {
        var bytes = new Array();
        for (var i = 0; i < str.length; i++) {
            var s = str.substr(i, 1);
            var v = s.toString().charCodeAt();
            bytes.push(v);
        }
        return bytes;
    }

var crypto = require('crypto');

var temp=MD5(key).toString().substring(0, 8).toUpperCase();
 var KEY = this.Str2Bytes(temp); // [ 1, 2, 3, 4, 5, 6, 7, 8 ];
 var IV =KEY;                 // [ 1, 2, 3, 4, 5, 6, 7, 8 ];

var encryted_content=this.encryptDes(content ,KEY,IV);

var decryted_content=this.decryptDes(encryted_content,IV,KEY);
var user_json=JSON.parse(decryted_content);