本文主要讲解关于关于加密解密 Base64 and URL and Hex Encoding and Decoding相关内容，由优网导航（www.uonce.com）提供，欢迎关注收藏本站！今天想换一下Discuz论坛的风格，谁知下载风格文件后，发现竟然是通过Base64加密过的 小林给推荐了个解密的页面，提取出代码如下：
复制代码 代码如下:
<!DOCTYPE html PUBLIC “-//W3C//DTD HTML 4.01 Transitional//EN”> <html> <head> <title>Base64 and URL and Hex Encoding and Decoding</title> <meta name=”description” content=”Encodes or decodes data in Base64 or URL encoding using client side JavaScript” /> <meta name=”keywords” content=”base64, base 64, urlencode, urldecode, hexencode, hex encode, hexdecode hex decode, javascript base64, javascript base 64, javascript urlencode, javascript urldecode, javascript hexencode, javascript hexdecode” /> <link rel=”shortcut icon” href=”http://ostermiller.org/favicon.ico” type=”image/x-icon” /> <script language=javascript type=”text/javascript”> <!– function urlDecode(str){ str=str.replace(new RegExp(‘+’,’g’),’ ‘); return unescape(str); } function urlEncode(str){ str=escape(str); str=str.replace(new RegExp(‘+’,’g’),’%2B’); return str.replace(new RegExp(‘%20′,’g’),’+’); } var END_OF_INPUT = -1; var base64Chars = new Array( ‘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′,’+’,’/’ ); var reverseBase64Chars = new Array(); for (var i=0; i < base64Chars.length; i++){ reverseBase64Chars[base64Chars[i]] = i; } var base64Str; var base64Count; function setBase64Str(str){ base64Str = str; base64Count = 0; } function readBase64(){ if (!base64Str) return END_OF_INPUT; if (base64Count >= base64Str.length) return END_OF_INPUT; var c = base64Str.charCodeAt(base64Count) & 0xff; base64Count++; return c; } function encodeBase64(str){ setBase64Str(str); var result = ”; var inBuffer = new Array(3); var lineCount = 0; var done = false; while (!done && (inBuffer[0] = readBase64()) != END_OF_INPUT){ inBuffer[1] = readBase64(); inBuffer[2] = readBase64(); result += (base64Chars[ inBuffer[0] >> 2 ]); if (inBuffer[1] != END_OF_INPUT){ result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30) | (inBuffer[1] >> 4) ]); if (inBuffer[2] != END_OF_INPUT){ result += (base64Chars [((inBuffer[1] << 2) & 0x3c) | (inBuffer[2] >> 6) ]); result += (base64Chars [inBuffer[2] & 0x3F]); } else { result += (base64Chars [((inBuffer[1] << 2) & 0x3c)]); result += (‘=’); done = true; } } else { result += (base64Chars [(( inBuffer[0] << 4 ) & 0x30)]); result += (‘=’); result += (‘=’); done = true; } lineCount += 4; if (lineCount >= 76){ result += (‘n’); lineCount = 0; } } return result; } function readReverseBase64(){ if (!base64Str) return END_OF_INPUT; while (true){ if (base64Count >= base64Str.length) return END_OF_INPUT; var nextCharacter = base64Str.charAt(base64Count); base64Count++; if (reverseBase64Chars[nextCharacter]){ return reverseBase64Chars[nextCharacter]; } if (nextCharacter == ‘A’) return 0; } return END_OF_INPUT; } function ntos(n){ n=n.toString(16); if (n.length == 1) n=”0″+n; n=”%”+n; return unescape(n); } function decodeBase64(str){ setBase64Str(str); var result = “”; var inBuffer = new Array(4); var done = false; while (!done && (inBuffer[0] = readReverseBase64()) != END_OF_INPUT && (inBuffer[1] = readReverseBase64()) != END_OF_INPUT){ inBuffer[2] = readReverseBase64(); inBuffer[3] = readReverseBase64(); result += ntos((((inBuffer[0] << 2) & 0xff)| inBuffer[1] >> 4)); if (inBuffer[2] != END_OF_INPUT){ result += ntos((((inBuffer[1] << 4) & 0xff)| inBuffer[2] >> 2)); if (inBuffer[3] != END_OF_INPUT){ result += ntos((((inBuffer[2] << 6) & 0xff) | inBuffer[3])); } else { done = true; } } else { done = true; } } return result; } var digitArray = new Array(‘0′,’1′,’2′,’3′,’4′,’5′,’6′,’7′,’8′,’9′,’a’,’b’,’c’,’d’,’e’,’f’); function toHex(n){ var result = ” var start = true; for (var i=32; i>0;){ i-=4; var digit = (n>>i) & 0xf; if (!start || digit != 0){ start = false; result += digitArray[digit]; } } return (result==”?’0′:result); } function pad(str, len, pad){ var result = str; for (var i=str.length; i<len; i++){ result = pad + result; } return result; } function encodeHex(str){ var result = “”; for (var i=0; i<str.length; i++){ result += pad(toHex(str.charCodeAt(i)&0xff),2,’0′); } return result; } function decodeHex(str){ str = str.replace(new RegExp(“s/[^0-9a-zA-Z]//g”)); var result = “”; var nextchar = “”; for (var i=0; i<str.length; i++){ nextchar += str.charAt(i); if (nextchar.length == 2){ result += ntos(eval(‘0x’+nextchar)); nextchar = “”; } } return result; } //–></script> </head> <body> <form name=code onsubmit=”return false()”> <textarea name=text style=’width:100%;height:75%;’ onfocus=’if (this.value==”Enter text to encode or decode here.”){this.value=””;}’>Enter text to encode or decode here.</textarea> <table> <tr><td align=center> <input value=”Encode” type=button onclick=”document.code.text.value=urlEncode(document.code.text.value);”> </td><td align=center> URL </td><td align=center> <input value=”Decode” type=button onclick=”document.code.text.value=urlDecode(document.code.text.value);”> </td></tr> <tr><td align=center> <input value=”Encode” type=button onclick=”document.code.text.value=encodeBase64(document.code.text.value);”> </td><td align=center> Base 64 </td><td align=center> <input value=”Decode” type=button onclick=”document.code.text.value=decodeBase64(document.code.text.value);”> </td></tr> <tr><td align=center> <input value=”Encode” type=button onclick=”document.code.text.value=encodeHex(document.code.text.value);”> </td><td align=center> Hex </td><td align=center> <input value=”Decode” type=button onclick=”document.code.text.value=decodeHex(document.code.text.value);”> </td></tr> <tr><td align=center> </td><td align=center> <input type=reset value=Clear> </td><td align=center> </td></tr> </table> </form> <hr> Base64 encode/decode was ported from a <a href=”http://ostermiller.org/utils/Base64.html”>Java Base64 encoder/decoder</a>.<br> Base64 encode/decode was ported to <a href=”http://ostermiller.org/base64_actionscript.html”>Macromedia Actionscript</a>.<br> <h3>License</h3> <p>This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.</p> <p>This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the <a href=”http://www.gnu.org/copyleft/gpl.html”>GNU General Public License</a> for more details.</p> <div style=”padding:0.2cm;”><a href=”http://ostermiller.org/calc/”>More converters, calculators, and other JavaScript goodies</a></div> <div style=”padding:0.2cm;text-align:right;”><a href=”http://ostermiller.org/”>ostermiller.org</a> (<a href=”http://ostermiller.org/siteindex.html”>site index</a>)</div> <div style=”padding:0.2cm;”><p>Copyright <a href=”http://ostermiller.org/contact.pl?regarding=JavaScript+Encoding” class=mail>Stephen Ostermiller</a> 2003-2006</p></div> </body> </html>
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