암호화

function func_encMd5Base64($plain_text, $password="password", $iv_len = 16) {
if($plain_text) {
$plain_text .= "\x13";
$n = strlen($plain_text);

if ($n % 16) $plain_text .= str_repeat("\0", 16 - ($n % 16));

$i = 0;
while($iv_len-- > 0) {
$enc_text .= chr(mt_rand() & 0xff);
}

$iv = substr($password ^ $enc_text, 0, 512);

while($i < $n) {
$block = substr($plain_text, $i, 16) ^ pack('H*', md5($iv));
$enc_text .= $block;
$iv = substr($block . $iv, 0, 512) ^ $password;
$i += 16;
}

return base64_encode($enc_text);
}

else {
return "";
}
}



function func_decMd5Base64($enc_text, $password="password", $iv_len = 16) {
if($enc_text) {
$enc_text = base64_decode($enc_text);
$n = strlen($enc_text);

$i = $iv_len;

$plain_text = '';

$iv = substr($password ^ substr($enc_text, 0, $iv_len), 0, 512);

while($i < $n) {
$block = substr($enc_text, $i, 16);
$plain_text .= $block ^ pack('H*', md5($iv));
$iv = substr($block . $iv, 0, 512) ^ $password;
$i += 16;
}

return preg_replace('/\x13\x00*$/', '', $plain_text);
}

else {
return "";
}
}


스팸방지 이미지 만들때사용 소스에서 펌 (제작자모름)


if(session_is_registered($sp_sess_var) || $_SESSION[$sp_sess_var]) {
session_unregister($sp_sess_var);
unset($_SESSION[$sp_sess_var]);
}

session_register($sp_sess_var);
$default_md5 = md5(microtime()); // 난수문자 생성.
$spam_strmd5 = strtoupper(substr($default_md5, 0, 7));
$_SESSION[$sp_sess_var] = func_encMd5Base64($spam_strmd5);