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/* | |
* RC4 symmetric cipher encryption/decryption | |
* | |
* @license Public Domain | |
* @param string key - secret key for encryption/decryption | |
* @param string str - string to be encrypted/decrypted | |
* @return string | |
*/ | |
function rc4(key, str) { | |
var s = [], j = 0, x, res = ''; | |
for (var i = 0; i < 256; i++) { | |
s[i] = i; | |
} | |
for (i = 0; i < 256; i++) { | |
j = (j + s[i] + key.charCodeAt(i % key.length)) % 256; | |
x = s[i]; | |
s[i] = s[j]; | |
s[j] = x; | |
} | |
i = 0; | |
j = 0; | |
for (var y = 0; y < str.length; y++) { | |
i = (i + 1) % 256; | |
j = (j + s[i]) % 256; | |
x = s[i]; | |
s[i] = s[j]; | |
s[j] = x; | |
res += String.fromCharCode(str.charCodeAt(y) ^ s[(s[i] + s[j]) % 256]); | |
} | |
return res; | |
} |
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<?php | |
/* | |
* RC4 symmetric cipher encryption/decryption | |
* | |
* @license Public Domain | |
* @param string key - secret key for encryption/decryption | |
* @param string str - string to be encrypted/decrypted | |
* @return string | |
*/ | |
function rc4($key, $str) { | |
$s = array(); | |
for ($i = 0; $i < 256; $i++) { | |
$s[$i] = $i; | |
} | |
$j = 0; | |
for ($i = 0; $i < 256; $i++) { | |
$j = ($j + $s[$i] + ord($key[$i % strlen($key)])) % 256; | |
$x = $s[$i]; | |
$s[$i] = $s[$j]; | |
$s[$j] = $x; | |
} | |
$i = 0; | |
$j = 0; | |
$res = ''; | |
for ($y = 0; $y < strlen($str); $y++) { | |
$i = ($i + 1) % 256; | |
$j = ($j + $s[$i]) % 256; | |
$x = $s[$i]; | |
$s[$i] = $s[$j]; | |
$s[$j] = $x; | |
$res .= $str[$y] ^ chr($s[($s[$i] + $s[$j]) % 256]); | |
} | |
return $res; | |
} | |
?> |
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