JS-BASE64 encryption

Source: Internet
Author: User

Js-base64 Encryption Instance:

<! doctype html>

Base64,js

/****  base64 encode / decode**   @author  *   @date     2010-04-26*   @email   **/ function base64 ()  { //  private property_keystr =  "abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz0123456789+/=";  // public method for encodingthis.encode = function  (Input)  {var  output =  "";var chr1, chr2, chr3, enc1, enc2, enc3, enc4; Var i = 0;input = _utf8_encode (Input);while  (i < input.length)  {chr1 = input.charcodeat (i++); Chr2 = input.charcodeat (i++);chr3 =  Input.charcodeat (i++);enc1 = chr1 >> 2;enc2 =  ((chr1 & 3)  << 4)  |  (chr2 >> 4);enc3 =  ((chr2 & 15) &NBSP;&LT;&LT;&NBSP;2)  |  (CHR3&NBsp;>> 6);enc4 = chr3 & 63;if  (IsNaN (CHR2))  {enc3 = enc4  = 64;}  else if  (IsNaN (CHR3))  {enc4 = 64;} Output = output +_keystr.charat (ENC1)  + _keystr.charat (ENC2)  +_keystr.charat ( ENC3)  + _keystr.charat (ENC4);} Return output;}  // public method for decodingthis.decode = function  (Input)  {var  output =  ""; var chr1, chr2, chr3;var enc1, enc2, enc3, enc4 ; Var i = 0;input = input.replace (/[^a-za-z0-9\+\/\=]/g,  "");while  (i  < input.length)  {enc1 = _keystr.indexof (Input.charat (i++)); enc2 = _ Keystr.indexof (Input.charat (i++)); Enc3 = _keystr.indexof (Input.charat (i++)); enc4 = _ Keystr.indexof (Input.charat (i++));chr1 =  (enc1 << 2)  |  (ENC2&NBSP;&GT;&GT;&NBSP;4);chr2 =  ((enc2 & 15)  << 4)  |  (enc3 >> &NBSP;2);chr3 =  ((enc3 & 3)  << 6)  | enc4;output =  Output + string.fromcharcode (CHR1);if  (enc3 != 64)  {output = output  + string.fromcharcode (CHR2);} if  (enc4 != 64)  {output = output + string.fromcharcode (CHR3);}} Output = _utf8_decode (output); return output;}  // private method for UTF-8 encoding_utf8_encode = function  ( String)  {string = string.replace (/\r\n/g, "\ n");var utftext =  "";for  (Var  n = 0; n < string.length; n++)  {var c =  String.charcodeat (n);if  (c < 128)  {utftext += string.fromcharcode (c);  else if ((c > 127)  &&  (c < 2048))  {utftext += string.fromcharcode ((c >> 6)  |  192); Utftext += string.fromcharcode ((c & 63)  | 128);}  else {utftext += string.fromcharcode ((c >> 12)  | 224); Utftext  += string.fromcharcode (((c >> 6)  & 63)  | 128);utftext  += string.fromcharcode ((c & 63)  | 128);}  }return utftext;}  // private method for UTF-8 decoding_utf8_decode = function  ( Utftext)  {var string =  ";var i = 0;var c = c1 =  c2 = 0;while  ( i < utftext.length )  {c =  Utftext.charcodeat (i);if  (c < 128)  {string += string.fromcharcode (c); i++;}  else if ((c > 191)  &&  (c < 224)  {c2 = utftext.charcodeat (i+1); String += string.fromcharcode ((c  & 31) ( << 6)  |  (c2 & 63)); i += 2;}  else {c2 = utftext.charcodeat (i+1); C3 = utftext.charcodeat (i+2); string +=  string.fromcharcode ((c & 15)  << 12)  |  ((c2 & 63)  << 6)  |  (c3 & 63)); i += 3;}} return string;}}

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This article is from the "Wennuanyiran" blog, make sure to keep this source http://dingzhaoqiang.blog.51cto.com/5601059/1703095

JS-BASE64 encryption

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