function KDF()
{
$debug = $this->debug;
if ($this->decryptorTest) {
$debug = false;
}
// KDF constants
$hmacKey = unhexlify("3b27bdc9e00fd5995d60a1ee0aa057a9f1416ed085b21762110f1c2204ddf80ec8caab003070fd43baafdde27aeb3194ece5c1adff406a51185eb5dd7300c058");
$hmacData1 = unhexlify("d1ba6371c56ce6b498f1718228b0aa112f24a47bcad757a1d0b3f4c2b8bd637cb8080d9c8e7855b36a85722a60552a6c00");
$hmacData2 = unhexlify("d1ba6371c56ce6b498f1718228b0aa112f24a47bcad757a1d0b3f4c2b8bd637cb8080d9c8e7855b36a85722a60552a6c01");
// Decrypt packet salt
if ($this->ecmID !== $this->prevEcmID) {
$saltHmacKey = hash_hmac("sha1", $this->sessionKey . $this->packetIV, $hmacKey, true);
LogDebug("SaltHmacKey : " . hexlify($saltHmacKey), $debug);
$this->saltAesKey = substr(hash_hmac("sha1", $hmacData1, $saltHmacKey, true), 0, 16);
LogDebug("SaltAesKey : " . hexlify($this->saltAesKey), $debug);
$this->prevEcmID = $this->ecmID;
}
mcrypt_generic_init($this->aes_cbc, $this->saltAesKey, $this->packetIV);
LogDebug("EncryptedSalt: " . hexlify($this->packetSalt), $debug);
$decryptedSalt = mdecrypt_generic($this->aes_cbc, $this->packetSalt);
LogDebug("DecryptedSalt: " . hexlify($decryptedSalt), $debug);
mcrypt_generic_deinit($this->aes_cbc);
$this->decryptBytes = ReadInt32($decryptedSalt, 0);
LogDebug("DecryptBytes : " . $this->decryptBytes, $debug);
$decryptedSalt = substr($decryptedSalt, 4, 16);
LogDebug("DecryptedSalt: " . hexlify($decryptedSalt), $debug);
// Generate final packet decryption key
$finalHmacKey = hash_hmac("sha1", $decryptedSalt, $hmacKey, true);
LogDebug("FinalHmacKey : " . hexlify($finalHmacKey), $debug);
$this->packetKey = substr(hash_hmac("sha1", $hmacData2, $finalHmacKey, true), 0, 16);
LogDebug("PacketKey : " . hexlify($this->packetKey), $debug);
}
public static function generateToken($url)
{
$url = str_replace('http://redir.atmcdn.pl/http/', '', $url);
$SecretKey = 'AB9843DSAIUDHW87Y3874Q903409QEWA';
$iv = 'ab5ef983454a21bd';
$KeyStr = '0f12f35aa0c542e45926c43a39ee2a7b38ec2f26975c00a30e1292f7e137e120e5ae9d1cfe10dd682834e3754efc1733';
$salt = '';
for ($i = 0; $i < 16; $i++) {
$salt .= chr(mt_rand(ord('a'), ord('z')));
}
$salt = hexlify($salt);
$expire = 3600000 + time() * 1000 - 946684800000;
$td = mcrypt_module_open('rijndael-128', '', 'cbc', $iv);
mcrypt_generic_init($td, $SecretKey, $iv);
$decrypted = mdecrypt_generic($td, unhexlify($KeyStr));
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
$key = utf8_encode(trim($decrypted));
$unencryptedToken = "name=" . $url . "&expire=" . $expire . "";
$pad = '';
$xx = 16 - strlen($unencryptedToken) % 16;
for ($a = 1; $a <= $xx; $a++) {
$pad .= chr(16 - strlen($unencryptedToken) % 16);
}
$unencryptedToken = $unencryptedToken . $pad;
$td = mcrypt_module_open('rijndael-128', '', 'cbc', unhexlify($salt));
mcrypt_generic_init($td, unhexlify($key), unhexlify($salt));
$encrypted = mcrypt_generic($td, $unencryptedToken);
mcrypt_generic_deinit($td);
mcrypt_module_close($td);
$token = strtoupper(hexlify($encrypted));
return "http://redir.atmcdn.pl/http/{$url}?salt={$salt}&token={$token}";
}
