I could login with the following code:

function create_passlib_pbkdf2($algo, $password, $salt, $iterations)
{
$hash = hash_pbkdf2($algo, $password, base64_decode(str_replace(".", "+", $salt)), $iterations, 64, true);
return sprintf("\$pbkdf2-%s\$%d\$%s\$%s", $algo, $iterations, $salt, str_replace("+", ".", rtrim(base64_encode($hash), '=')));
}

$rs = DB::Query("select password from res_users where login='".$username."'");
$data=$rs->fetchAssoc();
if($data)
{
​$parts = explode('$', $data['password']);
​if (!array_key_exists(4, $parts)) return false;
​$t = explode('-', $parts[1]);if (!array_key_exists(1, $t)) return false;

​$algo = $t[1];
​$iterations = (int) $parts[2];
​$salt = $parts[3];
​$orghash = $parts[4];

​$hash = create_passlib_pbkdf2($algo, $password, $salt, $iterations);
​if($data['password'] == $hash) // if true then login successful
​{
​​$password=$hash;
​ ​return true;
​}
}
return false; // login failed