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<?php
Description: PHP write encryption function, support private key
function keyed ($txt, $encrypt _key)
{
$encrypt _key = MD5 ($encrypt _key);
$ctr = 0;
$tmp = "";
for ($i =0; $i <strlen ($txt); $i + +)
{
if ($ctr ==strlen ($encrypt _key)) $ctr = 0;
$tmp. = substr ($txt, $i, 1) ^ substr ($encrypt _key, $ctr, 1);
$ctr + +;
}
return $tmp;
}
function Encrypt ($txt, $key)
{
Srand (Double) microtime () *1000000);
$encrypt _key = MD5 (rand (0,32000));
$ctr = 0;
$tmp = "";
for ($i =0; $i <strlen ($txt); $i + +)
{
if ($ctr ==strlen ($encrypt _key)) $ctr = 0;
$tmp. = substr ($encrypt _key, $ctr, 1). (Substr ($txt, $i, 1) ^ substr ($encrypt _key, $ctr, 1));
$ctr + +;
}
Return keyed ($tmp, $key);
}
function Decrypt ($txt, $key)
{
$txt = keyed ($txt, $key);
$tmp = "";
for ($i =0; $i <strlen ($txt); $i + +)
{
$MD 5 = substr ($txt, $i, 1);
$i + +;
$tmp. = (substr ($txt, $i, 1) ^ $md 5);
}
return $tmp;
}
$key = "yitu.org";
$string = "I am an encrypted character";
Encrypt $string, and store it in $enc _text
$enc _text = Encrypt ($string, $key);
Decrypt the encrypted text $enc _text, and store it in $dec _text
$dec _text = Decrypt ($enc _text, $key);
Print "Encrypted text: $enc _text <Br>";
Print "Decrypted text: $dec _text <Br>";
?>
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