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JavaScript DHTML/Security/Base64 - История изменений
2026-04-05T18:12:44Z
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http://wbex.ru/index.php?title=JavaScript_DHTML/Security/Base64&diff=3698&oldid=prev
в 09:59, 26 мая 2010
2010-05-26T09:59:55Z
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Admin: 1 версия
2010-05-26T07:27:20Z
<p>1 версия</p>
<p><b>Новая страница</b></p><div>==Base64 Encoding/Decoding==<br />
<br />
<br />
<br />
<br />
<br />
<!-- start source code --><br />
<br />
<source lang="html4strict"><br />
<html><br />
<head><br />
<!--<br />
CryptoMX Tools<br />
Copyright (C) 2004 - 2006 Derek Buitenhuis<br />
This program is free software; you can redistribute it and/or<br />
modify it under the terms of the GNU General Public License<br />
as published by the Free Software Foundation; either version 2<br />
of the License, or (at your option) any later version.<br />
This program is distributed in the hope that it will be useful,<br />
but WITHOUT ANY WARRANTY; without even the implied warranty of<br />
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the<br />
GNU General Public License for more details.<br />
You should have received a copy of the GNU General Public License<br />
along with this program; if not, write to the Free Software<br />
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.<br />
--><br />
<title>Base64 Encoding/Decoding</title><br />
</head><br />
<body><br />
<script type="text/javascript"><!--<br />
var keyStr = "ABCDEFGHIJKLMNOP" +<br />
"QRSTUVWXYZabcdef" +<br />
"ghijklmnopqrstuv" +<br />
"wxyz0123456789+/" +<br />
"=";<br />
function encode64(input) {<br />
var output = "";<br />
var chr1, chr2, chr3 = "";<br />
var enc1, enc2, enc3, enc4 = "";<br />
var i = 0;<br />
do {<br />
chr1 = input.charCodeAt(i++);<br />
chr2 = input.charCodeAt(i++);<br />
chr3 = input.charCodeAt(i++);<br />
enc1 = chr1 >> 2;<br />
enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);<br />
enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);<br />
enc4 = chr3 & 63;<br />
if (isNaN(chr2)) {<br />
enc3 = enc4 = 64;<br />
} else if (isNaN(chr3)) {<br />
enc4 = 64;<br />
}<br />
output = output +<br />
keyStr.charAt(enc1) +<br />
keyStr.charAt(enc2) +<br />
keyStr.charAt(enc3) +<br />
keyStr.charAt(enc4);<br />
chr1 = chr2 = chr3 = "";<br />
enc1 = enc2 = enc3 = enc4 = "";<br />
} while (i < input.length);<br />
return output;<br />
}<br />
function decode64(input) {<br />
var output = "";<br />
var chr1, chr2, chr3 = "";<br />
var enc1, enc2, enc3, enc4 = "";<br />
var i = 0;<br />
// remove all characters that are not A-Z, a-z, 0-9, +, /, or =<br />
var base64test = /[^A-Za-z0-9\+\/\=]/g;<br />
if (base64test.exec(input)) {<br />
alert("There were invalid base64 characters in the input text.\n" +<br />
"Valid base64 characters are A-Z, a-z, 0-9, �+�, �/�, and �=�\n" +<br />
"Expect errors in decoding.");<br />
}<br />
input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");<br />
do {<br />
enc1 = keyStr.indexOf(input.charAt(i++));<br />
enc2 = keyStr.indexOf(input.charAt(i++));<br />
enc3 = keyStr.indexOf(input.charAt(i++));<br />
enc4 = keyStr.indexOf(input.charAt(i++));<br />
chr1 = (enc1 << 2) | (enc2 >> 4);<br />
chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);<br />
chr3 = ((enc3 & 3) << 6) | enc4;<br />
output = output + String.fromCharCode(chr1);<br />
if (enc3 != 64) {<br />
output = output + String.fromCharCode(chr2);<br />
}<br />
if (enc4 != 64) {<br />
output = output + String.fromCharCode(chr3);<br />
}<br />
chr1 = chr2 = chr3 = "";<br />
enc1 = enc2 = enc3 = enc4 = "";<br />
} while (i < input.length);<br />
return output;<br />
}<br />
//--></script><br />
<form name="base64Form"><br />
<center><br />
Type in the message you want to encode in Base64, or paste<br><br />
Base64 encoded text into the text field, select Encode or Decode, <br><br />
and click the button! You can use Base64 encoded messages with<br><br />
the <a href="stegano.html">Steganography</a> page.<br><br />
<br><br />
<textarea name="theText" cols="40" rows="6"></textarea><br><br />
<input type="button" name="encode" value="Encode to base64"<br />
onClick="document.base64Form.theText.value=encode64(document.base64Form.theText.value);"><br />
<input type="button" name="decode" value="Decode from base64"<br />
onClick="document.base64Form.theText.value=decode64(document.base64Form.theText.value);"><br />
<center><br />
</form><br />
</body><br />
</html><br />
<br />
</source></div>
Admin