C # Cryptographic decryption (DES,3DES,MD5,BASE64) class

Original: C # cryptographic decryption (DES,3DES,MD5,BASE64) class

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public sealed class Encryptutils {#region Base64 encryption/decryption//<summary>//BASE64 encryption//        </summary>//<param name= "Input" > string to be encrypted </param>///<returns></returns>         public static string Base64encrypt (string input) {return Base64encrypt (input, New utf8encoding ()); }//<summary>//BASE64 encryption///</summary>/<param name= "Input" >         Strings that need to be encrypted </param>///<param name= "encode" > Character encoding </param>//<returns></returns> public static string Base64encrypt (string input, Encoding encode) {return Convert.tobase64strin G (encode.        GetBytes (input)); }///<summary>//BASE64 decryption///</summary>/<param name= "Input" > the string to be decrypted </param>//<returns></returns> public static string Base64decrypt (String input{return Base64decrypt (input, New utf8encoding ()); }///<summary>//BASE64 decryption///</summary>/<param name= "Input" > the string to be decrypted        </param>//<param name= "encode" > Character encoding </param>//<returns></returns> public static string Base64decrypt (string input, Encoding encode) {return encode.        GetString (convert.frombase64string (input));        } #endregion #region des encryption Decrypt//<summary>//DES encryption//</summary> <param name= "Data" > Encrypted data </param>//<param name= "key" >8 bit character key string </param>//&lt ;p Aram Name= "IV" >8-bit character initialization vector string </param>///<returns></returns> public static string DES Encrypt (string data, string key, String iv) {byte[] Bykey = System.Text.ASCIIEncoding.ASCII.GetBytes (ke            y); byte[] Byiv = System.teXt.            ASCIIEncoding.ASCII.GetBytes (iv);            DESCryptoServiceProvider CryptoProvider = new DESCryptoServiceProvider ();            int i = cryptoprovider.keysize;            MemoryStream ms = new MemoryStream ();            CryptoStream CST = new CryptoStream (MS, Cryptoprovider.createencryptor (Bykey, Byiv), cryptostreammode.write);            StreamWriter SW = new StreamWriter (CST); Sw.            Write (data); Sw.            Flush (); Cst.            FlushFinalBlock (); Sw.            Flush (); Return convert.tobase64string (Ms. GetBuffer (), 0, (int) Ms.        Length); }///<summary>//des decryption//</summary>/<param name= "Data" > Decrypt Data </par am>//<param name= "key" >8 bit character key string (required and encrypted) </param>//<param Name= "IV" >8 bit character initialization vector word (same as required and encrypted) </param>///<returns></returns> public static string Desdecrypt (String data, String key, String iv) {byte[] Bykey= System.Text.ASCIIEncoding.ASCII.GetBytes (key);            byte[] Byiv = System.Text.ASCIIEncoding.ASCII.GetBytes (iv);            Byte[] Byenc;            try {Byenc = convert.frombase64string (data);            } catch {return null;            } DESCryptoServiceProvider CryptoProvider = new DESCryptoServiceProvider ();            MemoryStream ms = new MemoryStream (BYENC);            CryptoStream CST = new CryptoStream (MS, Cryptoprovider.createdecryptor (Bykey, Byiv), cryptostreammode.read);            StreamReader sr = new StreamReader (CST); return Sr.        ReadToEnd (); } #endregion #region MD5 encryption//<summary>//MD5 encryption//</summary>// /<param name= "Input" > string required for encryption </param>//<returns></returns> public static string  Md5encrypt (String input) {return Md5encrypt (input, New utf8encoding ());      }///<summary>//MD5 encryption//</summary>/<param name= "input" > Required encryption        String </param>//<param name= "encode" > Character encoding </param>//<returns></returns> public static string Md5encrypt (string input, Encoding encode) {MD5 MD5 = new Md5cryptoserviceprovi            Der (); byte[] t = Md5.computehash (encode.            GetBytes (input));            StringBuilder sb = new StringBuilder (32); for (int i = 0; i < t.length; i++) sb. Append (T[i]. ToString ("X").            PadLeft (2, ' 0 ')); Return SB.        ToString (); }///<summary>//MD5 file stream encryption///</summary>//<param name= "SR" ></param            >///<returns></returns> public static string Md5encrypt (Stream stream) {            MD5 Md5serv = Md5cryptoserviceprovider.create ();            byte[] buffer = Md5serv.computehash (stream);StringBuilder sb = new StringBuilder (); foreach (byte var in buffer) sb. Append (var.            ToString ("X2")); Return SB.        ToString (); }///<summary>//MD5 encryption (return 16-bit encryption string)///</summary>//<param name= "input" >& lt;/param>//<param name= "encode" ></param>///<returns></returns> Publi C Static string md5encrypt16 (string input, Encoding encode) {MD5CryptoServiceProvider MD5 = new MD5CRYP            Toserviceprovider (); string result = Bitconverter.tostring (Md5.computehash (encode.            GetBytes (Input)), 4, 8); result = result.            Replace ("-", "" ");        return result;            #endregion #region 3DES encryption to decrypt public static string Des3encrypt (string data, string key) {            TripleDESCryptoServiceProvider DES = new TripleDESCryptoServiceProvider (); Des.            Key = ASCIIEncoding.ASCII.GetBytes (key);Des.            Mode = CIPHERMODE.CBC; Des.            Padding = PADDINGMODE.PKCS7; ICryptoTransform desencrypt = DES.            CreateEncryptor ();            byte[] Buffer = ASCIIEncoding.ASCII.GetBytes (data);        Return convert.tobase64string (Desencrypt.transformfinalblock (Buffer, 0, buffer.length)); } public static string Des3decrypt (string data, string key) {TripleDESCryptoServiceProvider DES            = new TripleDESCryptoServiceProvider (); Des.            Key = ASCIIEncoding.ASCII.GetBytes (key); Des.            Mode = CIPHERMODE.CBC; Des.            Padding = System.Security.Cryptography.PaddingMode.PKCS7; ICryptoTransform desdecrypt = DES.            CreateDecryptor ();            string result = "";                try {byte[] Buffer = convert.frombase64string (data);            result = ASCIIEncoding.ASCII.GetString (Desdecrypt.transformfinalblock (Buffer, 0, buffer.length));           } catch (Exception e) { } return result; } #endregion}

　　

C # Cryptographic decryption (DES,3DES,MD5,BASE64) class