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    加密解密 Base64 and URL and Hex Encoding and Decoding
    
            
    來(lái)源：易賢網(wǎng)  閱讀：1459 次  日期：2016-11-14 10:17:40 
    
            
    溫馨提示：易賢網(wǎng)小編為您整理了“加密解密 Base64 and URL and Hex Encoding and Decoding”,方便廣大網(wǎng)友查閱！
    
            
    
                        
    
            
    
             
    今天想換一下Discuz論壇的風(fēng)格，誰(shuí)知下載風(fēng)格文件后，發(fā)現(xiàn)竟然是通過(guò)Base64加密過(guò)的   
    
小林給推薦了個(gè)解密的頁(yè)面，提取出代碼如下： 
    
<!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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