JS Base64 Encryption and decryption

/**** Encryption Base64Encode (UTF16TO8 (str)) * Decryption utf8to16 (Base64decode (str)) ***/var Base64encodechars = "  abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/"; var base64decodechars = new Array (-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 1,-1,-1,-1,-1,-1,-1, 1, -1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1, 1,-1,-62,-1, 1, 1, 63, 52, 53 , 57, 58, 59, 60, 61,-1,-1,-1,-1,-1,-1,-1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17 , 21, 22, 23, 24, 25,-1,-1,-1,-1,-1,-1, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44,  45, 46, 47, 48, 49, 50, 51,-1,-1,-1,-1,-1);      /** * Base64 Code * @param {Object} str */function Base64Encode (str) {var out, I, Len;      var C1, C2, C3;      len = str.length;      i = 0;      out = "";          while (I < len) {c1 = Str.charcodeat (i++) & 0xFF; if (i = = len) {out + = Base64encodechaRs.charat (C1 >> 2);              Out + = Base64encodechars.charat ((C1 & 0x3) << 4);              Out + = "=";          Break          } C2 = Str.charcodeat (i++);              if (i = = len) {out + = Base64encodechars.charat (C1 >> 2); Out + = Base64encodechars.charat (((C1 & 0x3) << 4) |              ((C2 & 0xF0) >> 4));              Out + = Base64encodechars.charat ((C2 & 0xF) << 2);              Out + = "=";          Break          } C3 = Str.charcodeat (i++);          Out + = Base64encodechars.charat (C1 >> 2); Out + = Base64encodechars.charat (((C1 & 0x3) << 4) |          ((C2 & 0xF0) >> 4)); Out + = Base64encodechars.charat (((C2 & 0xF) << 2) |          ((C3 & 0xC0) >> 6));      Out + = Base64encodechars.charat (C3 & 0x3F);  } return out;      }/** * Base64 decoding * @param {Object} str */function Base64decode (str) {var c1, C2, C3, C4; var i, Len, out;      len = str.length;      i = 0;      out = "";          while (I < len) {/* C1 */do {c1 = Base64decodechars[str.charcodeat (i++) & 0xFF];          } while (I < len && C1 = =-1);          if (C1 = =-1) break;          /* C2 */do {c2 = Base64decodechars[str.charcodeat (i++) & 0xFF];          } while (I < len && C2 = =-1);          if (C2 = =-1) break; Out + = String.fromCharCode ((C1 << 2) |          ((C2 & 0x30) >> 4));              /* C3 */Do {c3 = Str.charcodeat (i++) & 0xFF;              if (C3 = =) return out;          C3 = Base64decodechars[c3];          } while (I < Len && C3 = =-1);          if (C3 = =-1) break; Out + = String.fromCharCode (((C2 & 0XF) << 4) |          ((C3 & 0x3C) >> 2));     /* C4 */do {         C4 = str.charcodeat (i++) & 0xFF;              if (C4 = =) return out;          C4 = base64decodechars[c4];          } while (I < len && C4 = =-1);          if (C4 = =-1) break;      Out + = String.fromCharCode (((C3 & 0x03) << 6) | c4);  } return out;　　} function Utf16to8 (str) {var out, I, Len, C;　　out = "";　　len = str.length; for (i = 0; i < len; i++) {c = str.charcodeat (i), if ((C >= 0x0001) && (c <= 0x007F)) {out + = Str.char at (i); } else if (C > 0x07ff) {out + = String.fromCharCode (0xE0 |　　 ((c >> b) & 0x0F)); Out + = String.fromCharCode (0x80 |　　 ((c >> 6) & 0x3F)); Out + = String.fromCharCode (0x80 | ((c >> 0) & 0x3F)); } else {out + = String.fromCharCode (0xC0 |　　 ((c >> 6) & 0x1F)); Out + = String.fromCharCode (0x80 | ((c >> 0) & 0x3F)); }} return out;}　　function Utf8to16 (str) {var out, I, Len, C; var char2, CHAR3;　　out = "";　　len = str.length;　　i = 0; while (I < len) {c = str.charcodeat (i++), switch (c >> 4) {case 0:case 1:case 2:case 3:case 4:case 5:case　　 6:case 7://0xxxxxxx out + = Str.charat (i-1);　 Break　　 Case 12:case://110x xxxx 10xx xxxx char2 = str.charcodeat (i++); Out + = String.fromCharCode (((C & 0x1F) << 6) |　　 (Char2 & 0x3F));　 Break　　 Case://1110 xxxx 10xx xxxx 10xx xxxx char2 = str.charcodeat (i++);　　 CHAR3 = Str.charcodeat (i++);　　　　Out + = String.fromCharCode (((C & 0x0F) << 12) |　　　　((Char2 & 0x3F) << 6) |　　 ((Char3 & 0x3F) << 0)); Break }} return out;}

JS Base64 Encryption and decryption