MD5加密解密类（asp.net）&使用MD5过时处理

#region ========加密========/// <summary>/// 加密/// </summary>/// <param name="Text"></param>/// <returns></returns>public static string Encrypt(string Text){ ???return Encrypt(Text, "cong");}/// <summary> /// 加密数据 /// </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); ???} ???return ret.ToString();}#endregion#region ========解密========/// <summary>/// 解密/// </summary>/// <param name="Text"></param>/// <returns></returns>public static string Decrypt(string Text){ ???return Decrypt(Text, "cong");}/// <summary> /// 解密数据 /// </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

/// <summary>/// 32位MD5加密/// </summary>/// <param name="input"></param>/// <returns></returns>private static string Md5Hash(string input){MD5CryptoServiceProvider md5Hasher = new MD5CryptoServiceProvider();byte[] data = md5Hasher.ComputeHash(Encoding.Default.GetBytes(input));StringBuilder sBuilder = new StringBuilder();for (int i = 0; i < data.Length; i++){ ???sBuilder.Append(data[i].ToString("x2"));}return sBuilder.ToString();}