Common string encryption and decryption methods

Using system;using system.collections.generic;using system.io;using system.linq;using System.Security.Cryptography; Using system.text;using system.text.regularexpressions;using system.web.security;namespace HuaTong.General.Utility {//<summary>///Encryption tool class///</summary> public class Encrypthelper {//default key Priv Ate static string Aeskey = "[45/*yuidse.        e;] ";        private static string Deskey = "[&hdn72]"; <summary>//AES encryption///</summary> public static string Aesencrypt (string value, string _aeskey = null) {if (string.            IsNullOrEmpty (_aeskey)) {_aeskey = Aeskey;            } byte[] Keyarray = Encoding.UTF8.GetBytes (_aeskey);            byte[] Toencryptarray = Encoding.UTF8.GetBytes (value);            RijndaelManaged Rdel = new RijndaelManaged ();            Rdel.key = Keyarray;            Rdel.mode = CIPHERMODE.ECB; Rdel.padding =PADDINGMODE.PKCS7;            ICryptoTransform ctransform = Rdel.createencryptor ();            byte[] Resultarray = Ctransform.transformfinalblock (toencryptarray, 0, toencryptarray.length);        Return convert.tobase64string (resultarray, 0, resultarray.length); }//<summary>//AES decryption//</summary> public static string Aesdecrypt (Strin G value, String _aeskey = null) {try {if (string.                IsNullOrEmpty (_aeskey)) {_aeskey = Aeskey;                } byte[] Keyarray = Encoding.UTF8.GetBytes (_aeskey);                byte[] Toencryptarray = convert.frombase64string (value);                RijndaelManaged Rdel = new RijndaelManaged ();                Rdel.key = Keyarray;                Rdel.mode = CIPHERMODE.ECB;                rdel.padding = PADDINGMODE.PKCS7;                ICryptoTransform ctransform = Rdel.createdecryptor (); Byte[] Resultarray = Ctransform.transformfinalblock (toencryptarray, 0, toencryptarray.length);            Return Encoding.UTF8.GetString (resultarray); } catch {return string.            Empty; }}///<summary>//DES encryption//</summary> public static string DESENCR Ypt (string value, string _deskey = null) {if (string.            IsNullOrEmpty (_deskey)) {_deskey = Deskey;            } byte[] Keyarray = Encoding.UTF8.GetBytes (_deskey);            byte[] Toencryptarray = Encoding.UTF8.GetBytes (value);            DESCryptoServiceProvider Rdel = new DESCryptoServiceProvider ();            Rdel.key = Keyarray;            Rdel.mode = CIPHERMODE.ECB;            rdel.padding = PADDINGMODE.PKCS7;            ICryptoTransform ctransform = Rdel.createencryptor (); byte[] Resultarray = Ctransform.transformfinalblock (toencryptarray, 0, Toencryptarray.            Length);        Return convert.tobase64string (resultarray, 0, resultarray.length); }///<summary>//des decryption//</summary> public static string Desdecrypt (Strin G value, String _deskey = null) {try {if (string.                IsNullOrEmpty (_deskey)) {_deskey = Deskey;                } byte[] Keyarray = Encoding.UTF8.GetBytes (_deskey);                byte[] Toencryptarray = convert.frombase64string (value);                DESCryptoServiceProvider Rdel = new DESCryptoServiceProvider ();                Rdel.key = Keyarray;                Rdel.mode = CIPHERMODE.ECB;                rdel.padding = PADDINGMODE.PKCS7;                ICryptoTransform ctransform = Rdel.createdecryptor ();                byte[] Resultarray = Ctransform.transformfinalblock (toencryptarray, 0, toencryptarray.length);          Return Encoding.UTF8.GetString (resultarray);  } catch {return string.            Empty; }} public static string MD5 (string value) {byte[] result = Encoding.UTF8.GetBytes (value)            ;            MD5 MD5 = new MD5CryptoServiceProvider ();            byte[] Output = Md5.computehash (result); return bitconverter.tostring (Output).        Replace ("-", "" "); The public static string HMACMD5 (string value, String hmackey) {HMACSHA1 hmacsha1 = new HMACSHA1 (E Ncoding. UTF8.            GetBytes (Hmackey));            Byte[] result = System.Text.Encoding.UTF8.GetBytes (value);                        byte[] Output = Hmacsha1.computehash (result); return bitconverter.tostring (Output).        Replace ("-", "" ");        }//<summary>//Base64 codes//</summary>//<returns></returns> public static string Base64Encode (string value) {string result = Convert.tobase64string (encoding.d Efault.            GetBytes (value));        return result;        }//<summary>//Base64 decoding//</summary>//<returns></returns> public static string Base64decode (string value) {string result = Encoding.Default.GetString (conver            T.frombase64string (value));        return result; }    }}

Common string encryption and decryption methods