function cbc_mac($data, $k, $n)
{
$padding_size = strlen($data) % 16 == 0 ? 0 : 16 - strlen($data) % 16;
$data .= str_repeat("", $padding_size);
$chunks = get_chunks(strlen($data));
$file_mac = array(0, 0, 0, 0);
foreach ($chunks as $pos => $size) {
$chunk_mac = array($n[0], $n[1], $n[0], $n[1]);
for ($i = $pos; $i < $pos + $size; $i += 16) {
$block = str_to_a32(substr($data, $i, 16));
$chunk_mac = array($chunk_mac[0] ^ $block[0], $chunk_mac[1] ^ $block[1], $chunk_mac[2] ^ $block[2], $chunk_mac[3] ^ $block[3]);
$chunk_mac = aes_cbc_encrypt_a32($chunk_mac, $k);
}
$file_mac = array($file_mac[0] ^ $chunk_mac[0], $file_mac[1] ^ $chunk_mac[1], $file_mac[2] ^ $chunk_mac[2], $file_mac[3] ^ $chunk_mac[3]);
$file_mac = aes_cbc_encrypt_a32($file_mac, $k);
}
return $file_mac;
}
function base64_to_a32($s)
{
return str_to_a32(base64urldecode($s));
}
function Login($user, $pass)
{
global $T8;
if (!extension_loaded('bcmath')) {
html_error('This plugin needs BCMath extension for login.');
}
$password_aes = prepare_key(str_to_a32($pass));
$T8['user_handle'] = stringhash($user, $password_aes);
$res = apiReq(array('a' => 'us', 'user' => $user, 'uh' => $T8['user_handle']));
if (is_numeric($res[0])) {
check_errors($res[0], 'Cannot login');
}
$T8['master_key'] = decrypt_key(base64_to_a32($res[0]['k']), $password_aes);
$privk = a32_to_str(decrypt_key(base64_to_a32($res[0]['privk']), $T8['master_key']));
$rsa_priv_key = array(0, 0, 0, 0);
for ($i = 0; $i < 4; $i++) {
$l = (ord($privk[0]) * 256 + ord($privk[1]) + 7) / 8 + 2;
$rsa_priv_key[$i] = mpi2bc(substr($privk, 0, $l));
$privk = substr($privk, $l);
}
$T8['sid'] = rsa_decrypt(mpi2bc(base64url_decode($res[0]['csid'])), $rsa_priv_key[0], $rsa_priv_key[1], $rsa_priv_key[2]);
$T8['sid'] = base64url_encode(substr(strrev($T8['sid']), 0, 43));
getRootNode();
t8ArrToCookieArr($rsa_priv_key);
SaveCookies($user, $pass);
// Update cookies file.
$cookie = '';
}
