About encrypting and decrypting Base64 and URLs and Hex Encoding and Decoding_ scripts plus decryption

Today want to change the style of Discuz forum, who knows the download style file, found unexpectedly is through the Base64 encrypted
Kobayashi has recommended a decrypted page, extract the code as follows:

Copy Code code as follows:

<! DOCTYPE HTML PUBLIC "-//w3c//dtd HTML 4.01 transitional//en" >
<title>base64 and URLs 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, UrlEncode, UrlDecode, Hexencode, hex encode, Hexdecode hex, decode, Java  Script base64, JavaScript base, 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>
<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>
&LT;TR&GT;&LT;TD align=center>
<input value= "Encode" Type=button onclick= "Document.code.text.value=urlencode (document.code.text.value);" >
&LT;/TD&GT;&LT;TD align=center>
Url
&LT;/TD&GT;&LT;TD align=center>
<input value= "Decode" Type=button onclick= "Document.code.text.value=urldecode (document.code.text.value);" >
</td></tr>
&LT;TR&GT;&LT;TD align=center>
<input value= "Encode" Type=button onclick= "document.code.text.value=encodebase64 (document.code.text.value);" >
&LT;/TD&GT;&LT;TD align=center>
Base 64
&LT;/TD&GT;&LT;TD align=center>
<input value= "Decode" Type=button onclick= "document.code.text.value=decodebase64 (document.code.text.value);" >
</td></tr>
&LT;TR&GT;&LT;TD align=center>
<input value= "Encode" Type=button onclick= "Document.code.text.value=encodehex (document.code.text.value);" >
&LT;/TD&GT;&LT;TD align=center>
Hex
&LT;/TD&GT;&LT;TD align=center>
<input value= "Decode" Type=button onclick= "Document.code.text.value=decodehex (document.code.text.value);" >
</td></tr>
&LT;TR&GT;&LT;TD align=center>
&LT;/TD&GT;&LT;TD align=center>
<input Type=reset value=clear>
&LT;/TD&GT;&LT;TD align=center>
</td></tr>
</table>
</form>
Base64 Encode/decode is ported from a <a href= "http://ostermiller.org/utils/Base64.html" >java Base64 Decoder</a>.<br>
Base64 Encode/decode is ported to <a href= "http://ostermiller.org/base64_actionscript.html" >macromedia Actionscript</a>.<br>
<p>this are free software; You can redistribute it and/or modify it
Under the terms of the GNU general public License as published by the
Software Foundation; Either version 2 of the License, or (at your option)
Any later version.</p>
<p>this program are distributed in the hope that it would be useful,
but without any WARRANTY; Without even the implied warranty of merchantability
or FITNESS for A particular purpose. The
<a href= "http://www.gnu.org/copyleft/gpl.html" >gnu
General public license</a> for more details.</p>
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