C#base64 UTF8 string encryption and decryption

Base 64 decoding

New base64 (); string  orgstr= Encoding.Default.GetString (BB. Getdecoded ("Base64 compiled character "));

UTF8

Subject = encoding.getencoding ("utf-8"). GetString (convert.frombase64string ("UTF-compiled characters "

Base64 encryption

public class Base64 {char[] source;        int length, length2, length3;        int blockcount;        int paddingcount;        public static Base64 Decoder = new Base64 ();            Public base64 () {} private void init (char[] input) {int temp = 0;            Source = input; Length = input.            Length;            for (int x = 0; x < 2; + +) {if (input[length-x-1] = = ' = ') temp++;            } paddingcount = temp;            Blockcount = LENGTH/4;        length2 = Blockcount * 3; }///<summary>//encryption string decryption///</summary>//<param name= "Strinput" ><            /param>//<returns></returns> public byte[] getdecoded (string strinput) {            Initialize init (Strinput.tochararray ());            byte[] buffer = new Byte[length];         byte[] Buffer2 = new Byte[length2];   for (int x = 0; x < length; × x + +) {Buffer[x] = Char2sixbit (source[x]);            } byte B, B1, B2, B3;            Byte Temp1, Temp2, Temp3, Temp4;                for (int x = 0; x < Blockcount; × x + +) {Temp1 = buffer[x * 4];                TEMP2 = buffer[x * 4 + 1];                Temp3 = buffer[x * 4 + 2];                Temp4 = buffer[x * 4 + 3];                b = (byte) (Temp1 << 2);                B1 = (Byte) ((Temp2 &) >> 4);                B1 + = b;                b = (byte) ((Temp2 &) << 4);                b2 = (byte) ((Temp3 &) >> 2);                B2 + = b;                b = (byte) ((Temp3 & 3) << 6);                B3 = Temp4;                B3 + = b;                Buffer2[x * 3] = B1;                BUFFER2[X * 3 + 1] = B2;            BUFFER2[X * 3 + 2] = B3;            } length3 = Length2-paddingcount; Byte[] result = new Byte[leNGTH3];            for (int x = 0; x < length3; × x + +) {Result[x] = buffer2[x];        } return result; } Private byte Char2sixbit (char c) {char[] lookuptable = new char[64]{' A ', ' B '                 , ' C ', ' D ', ' E ', ' F ', ' G ', ' H ', ' I ', ' J ', ' K ', ' L ', ' M ', ' N ', ' O ', ' P ', ' Q ', ' R ', ' S ', ' T ', ' U ', ' V ', ' W ', ' X ', ' Y ', ' Z ', ' A ', ' B ', ' C ', ' d ', ' e ', ' f ', ' g ', ' h ', ' I ', ' j ', ' K ', ' l ', ' m ', ' n ', ' o ', ' P ', ' Q ', ' R ', ' s ', ' t ', ' u ', ' V ', ' w ', ' x '            , ' y ', ' z ', ' 0 ', ' 1 ', ' 2 ', ' 3 ', ' 4 ', ' 5 ', ' 6 ', ' 7 ', ' 8 ', ' 9 ', ' + ', '/';            if (c = = ' = ') return 0;  else {for (int x = 0; x < × x + +) {if (lookuptable[x] = =                c) return (byte) x;            } return 0; }}///<summary>//Base64 decryption, decrypted with UTF8 encoding///</summary>//<param NA Me="Result" > Ciphertext to Decrypt </param>//<returns> decrypted string </returns> public static string DecodeBase6        4 (string result) {return DecodeBase64 (Encoding.UTF8, result); }///<summary>//BASE64 decryption///</summary>/<param name= "codename" > Decryption using the Encoding method, note and encryption in the same way </param>///<param Name= "result" > ciphertext to be decrypted </param>//<returns> decrypted String </returns> public static string DecodeBase64 (Encoding encode, string result) {string de            Code = "";            byte[] bytes = convert.frombase64string (result); try {decode = encode.            GetString (bytes);            } catch {decode = result;        } return decode; }///<summary>//BASE64 encryption///</summary>/<param name= "codename" > Encryption using the Encoding </param>///&LT;p Aram Name= "source" > PlainText to be encrypted </param>//<returns></returns> public static string Encode            Base64 (Encoding encode, string source) {String decode = ""; byte[] bytes = encode.            GetBytes (source);            try {decode = convert.tobase64string (bytes);            } catch {decode = source;        } return decode; }///<summary>//BASE64 encryption, encrypted using UTF8 encoding///</summary>//<param name= "Sourc E "> The plaintext to be encrypted </param>//<returns> encrypted strings </returns> public static string EncodeBase64 (Stri        Ng source) {return EncodeBase64 (Encoding.UTF8, source); }    }

C#base64 UTF8 string encryption and decryption