加密MD5加密解密方法

asp.net实现MD5加密的方法asp.net自带的md5加密用下面这种方法但这种方法只能加密不能解密。

Respo nse.Write (Forms Authe ntica tion.HashP asswo rdFor Stori ngInC onfig Fi le("要加密的字符串","MD5"));

下面是使用密钥的加密带解密的代码

代码

/*用法protected void Page_Load(object sender, EventArgs e)

{

//加密this.Title=CEncrypt.DesEncrypt("pwd",CEncrypt.Key);this.Title+=CEncrypt.DesDecrypt(this.Title,CEncrypt.Key);

Response.Write(CEncrypt.DesDecrypt("gAYyhdLQunc=",CEncrypt.Key));

}

*/using Syste m;using Syste m. IO;using Syste m.Text;using Syste m.Security.Cryptography;using Syste m.Web;namespaceYD.Common

{

///<summa ry>

///加密码类

///</summa ry>publ icclass CEncrypt

{

///<summa ry>

///加密

///</summa ry>

///<param name="inputString"></param>

///<returns></returns>publ ic static string DesEncrypt(string inputString)

{return DesEncrypt(inputString,Key);

}

///<summa ry>

///解密

///</summa ry>

///<param name="inputString"></param>

///<returns></returns>publ ic static string DesDecrypt(string inputString)

{

return DesDecrypt(inputString,Key);

}

///<summa ry>

///密匙

///</summa ry>private static string Key

{get

{return"hongye10";

}

}

///<summary>

///加密字符串

///注意:密钥必须为 位

///</summa ry>

///<param name="strTe xt">字符串</param>

///<param name="encry ptKey">密钥</param>

///<param name="encry ptKey">返回加密后的字符串</param>publ i c static string DesEncrypt(string inputString, string encryptKey)

{byte[]byKey=nul l;byte[] IV={0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF};try

{byKey=Syste m.Text.Encoding.UTF8.GetBytes(encryptKey.Subst ring(0,8));

DESCryptoServiceProvider des= new DESCryptoServiceProvider();byte[] inputByteArray=Encoding.UTF8.GetBytes(inputString);

MemoryStream ms= new MemoryStream();

CryptoStream cs = new Crypt oStream(ms, des.CreateEncryptor(byKey, IV),CryptoStreamMode.Write);cs.Write(input ByteArray,0, inputByteArray.Length);cs.FlushFinalBlock();return Convert.ToBase64String(ms.ToArray());

}catch(System.Exception error)

{

//return error.Message;returnnul l;

}

}

///<summa ry>

///解密字符串

///</summa ry>

///<param name="this. input Strin g">加了密的字符串</param>

///<param name="decry ptKey">密钥</param>

///<param name="decry ptKey">返回解密后的字符串</param>publ ic static string DesDecrypt(string inputString, string decryptKey)

{byte[]byKey=nul l;byte[] IV={0x12,0x34,0x56,0x78,0x90,0xAB,0xCD,0xEF};byte[] inputByteArray=new Byte[inputString.Length];try

{byKey=Syste m.Text.Encoding.UTF8.GetBytes(decryptKey.Subst ring(0,8));

DESCryptoServiceProvider des= new DESCryptoServiceProvider();inputByteArray=Convert.FromBase64String(inputString);

MemoryStream ms= new MemoryStream();

CryptoStream cs = new Crypt oStream(ms, des.CreateDecryptor(byKey, IV),CryptoStreamMode.Write);cs.Write(inputByteArray,0, inputByteArray.Length);cs.FlushFinalBlock();

System.Text.Encoding encoding=new System.Text.UTF8Encoding();return encoding.GetString(ms.ToArray());

}catch(System.Exception error)

{

//return error.Message;returnnul l;

}

}

}

}