ASP. NET encryption Decryption class

Here you have a ready-made C # Cryptographic decryption class, provided by admin10000.com, including MD5, SHA1, des Encryption and decryption, BASE64 encoding decoding.

Import Namespaces First

      Using System.Web.Security;     Using System.Security.Cryptography;     Using System.Text;     Using System.IO;

<summary>
Encrypthelper from www.Admin10000.com
</summary>

public class encrypthelper{//provides 8 characters as the DES key (the program automatically intercepts the first 8 characters) private static string key = "admin10000.com";                <summary>//des symmetric encryption decrypted key///</summary> public static string key {                get {return key;                } set {key = value; }}///<summary>//MD5 encryption (irreversible encryption)///</summary>//<param name= "pass > Original string to encrypt </param>//<returns></returns> public static string Md5encrypt (String pass ) {System.Security.Cryptography.MD5 MD5 = new System.Security.Cryptography.MD5CryptoServiceProv                Ider ();                byte[] Bytresult = Md5.computehash (System.Text.Encoding.UTF8.GetBytes (pass)); MD5.                Clear ();                String strresult = Bitconverter.tostring (Bytresult); Strresult = Strresult.replace ("-", "" ");                        return strresult;                /* Another method pass = FormsAuthentication.HashPasswordForStoringInConfigFile (pass, "MD5");                return pass; */}///<summary>//SHA1 encryption (irreversible encryption)///</summary>//<param name = "Pass" > Raw string to encrypt </param>//<returns></returns> public static string Sha1encrypt (Stri Ng Pass) {System.Security.Cryptography.SHA1 SHA1 = new System.Security.Cryptography.SHA1CryptoServi                Ceprovider ();                byte[] Bytresult = Sha1.computehash (System.Text.Encoding.UTF8.GetBytes (pass)); SHA1.                Clear ();                String strresult = Bitconverter.tostring (Bytresult);                strresult = Strresult.replace ("-", "" ");                return strresult; /* Another method pass = FormsAuthentication.HashPasswordForStoringInConfigFile (pass, "SHA1 ");                return pass; */}//<summary>//DES encrypted strings///</summary>//<param name= "encrypts Tring "> Strings to be encrypted </param>//<returns> encryption successfully returns the encrypted string, failed to return the source string </returns> public static Strin G Desencrypt (String encryptstring) {try {byte[] RgbKey = ENC Oding. UTF8. GetBytes (key.                        Substring (0, 8));                        byte[] Rgbiv = RgbKey;                        byte[] Inputbytearray = Encoding.UTF8.GetBytes (encryptstring);                        DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider ();                        MemoryStream mstream = new MemoryStream ();                        CryptoStream cstream = new CryptoStream (Mstream, Dcsp.createencryptor (RgbKey, Rgbiv), cryptostreammode.write);                        Cstream.write (Inputbytearray, 0, inputbytearray.length); Cstream.flushfinalblOck ();                        Cstream.close ();                Return convert.tobase64string (Mstream.toarray ());                } catch {return encryptstring; }}///<summary>//des decryption string//</summary>//<param name= "decryptst Ring > string to Decrypt </param>//<returns> decryption successfully returns the decrypted string, failed back source string </returns> public static string Desdecrypt (String decryptstring) {try {byte[] RgbKey = encod Ing. UTF8. GetBytes (key.                        Substring (0, 8));                        byte[] Rgbiv = RgbKey;                        byte[] Inputbytearray = convert.frombase64string (decryptstring);                        DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider ();                        MemoryStream mstream = new MemoryStream (); CryptoStream cstream = new CryptoStream (Mstream,DCSP.                        CreateDecryptor (RgbKey, Rgbiv), cryptostreammode.write);                        Cstream.write (Inputbytearray, 0, inputbytearray.length);                        Cstream.flushfinalblock ();                        Cstream.close ();                Return Encoding.UTF8.GetString (Mstream.toarray ());                } catch {return decryptstring; }}///<summary>//Encode normal string as BASE64 strings///</summary>//<param name= " str "> Source string </param>//<returns></returns> public static string Base64Encode (String str        ) {return convert.tobase64string (Encoding.UTF8.GetBytes (str)); }///<summary>//Decode BASE64 string///</summary>//<param name= "str" >base64 string   </param>//<returns></returns> public static string Base64decode (String base64str)     {return Encoding.UTF8.GetString (convert.frombase64string (BASE64STR)); }}

