关于加密解密 Base64 and URL and Hex Encoding and Decoding

技术  /  管理员 发布于 7年前   289

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  

推荐了个解密的页面，提取出代码如下：

<!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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