c# - Simple Byte Encryption Not Working -

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when message decrypted, characters 1 less original. example: h g

i have tried debug code printing out values , goes until trying divide 100000 , multiplying date

here code used: didn't include main method here

    public static string encrypt(string input)     {         string final;          string date = datetime.now.date.toshortdatestring().tostring();          var datetime = int.parse(date.replace("/", ""));         list<int> semi = new list<int>();         var bytes = encoding.utf8.getbytes(input.tochararray());         (int = 0; < bytes.length; i++)         {             int y = bytes[i] * datetime / 100000;             semi.add(y);             console.writeline(y);         }          console.writeline(string.join("", bytes));          final = string.join(":", semi.toarray()) + ":" + date;         return final;     }       public static string decrypt(string input)     {         string final;         string[] raw = input.split(':');          int date = int.parse(raw[raw.length - 1].replace("/",""));         var dump = new list<string>(raw);          dump.removeat(raw.length - 1);         string[] stringbytes = dump.toarray();           list<byte> bytes = new list<byte>();          (int = 0; < stringbytes.length; i++)         {             int x = int.parse(stringbytes[i]);             console.writeline(x);              x = x * 100000 / date;             byte finalbytes = convert.tobyte(x);             bytes.add(finalbytes);          }         console.writeline(string.join("", bytes.toarray()));         console.writeline(date);         var bytearray = bytes.toarray();         final = encoding.utf8.getstring(bytearray);          return final;     }

you using low precision datatype int store result of division. have changed type double , works

    public static string encrypt(string input)     {         string final;          string date = datetime.now.date.tostring("mmddyyyy");          var datetime = int.parse(date);         list<double> semi = new list<double>();         var bytes = encoding.utf8.getbytes(input);         (int = 0; < bytes.length; i++)         {             double y = bytes[i] * datetime / 100000;             semi.add(y);             console.writeline(y);         }          console.writeline(string.join("", bytes));          final = string.join(":", semi.toarray()) + ":" + date;         return final;     }       public static string decrypt(string input)     {         string final;         string[] raw = input.split(':');          int date = int.parse(raw[raw.length - 1].replace("/", ""));         var dump = new list<string>(raw);          dump.removeat(raw.length - 1);         string[] stringbytes = dump.toarray();           list<byte> bytes = new list<byte>();          (int = 0; < stringbytes.length; i++)         {             var x = double.parse(stringbytes[i]);             console.writeline(x);              x = x * 100000 / date;             byte finalbytes = convert.tobyte(x);             bytes.add(finalbytes);          }         console.writeline(string.join("", bytes.toarray()));         console.writeline(date);         var bytearray = bytes.toarray();         final = encoding.utf8.getstring(bytearray);          return final;     }

here working console app http://ideone.com/rjc13a


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