host = $host;
		$host->add_hook($host::HOOK_AUTH_USER, $this);
	}
	function authenticate($login, $password) {
		$pwd_hash1 = encrypt_password($password);
		$pwd_hash2 = encrypt_password($password, $login);
		$login = db_escape_string($login);
		$otp = db_escape_string($_REQUEST["otp"]);
		if (get_schema_version() > 96) {
			if (!defined('AUTH_DISABLE_OTP') || !AUTH_DISABLE_OTP) {
				$result = db_query("SELECT otp_enabled,salt FROM ttrss_users WHERE
					login = '$login'");
				if (db_num_rows($result) > 0) {
					require_once "lib/otphp/vendor/base32.php";
					require_once "lib/otphp/lib/otp.php";
					require_once "lib/otphp/lib/totp.php";
					$base32 = new Base32();
					$otp_enabled = sql_bool_to_bool(db_fetch_result($result, 0, "otp_enabled"));
					$secret = $base32->encode(sha1(db_fetch_result($result, 0, "salt")));
					$topt = new \OTPHP\TOTP($secret);
					$otp_check = $topt->now();
					if ($otp_enabled) {
						if ($otp) {
							if ($otp != $otp_check) {
								return false;
							}
						} else {
							$return = urlencode($_REQUEST["return"]);
							?>
								
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							 87) {
			$result = db_query("SELECT salt FROM ttrss_users WHERE
				login = '$login'");
			if (db_num_rows($result) != 1) {
				return false;
			}
			$salt = db_fetch_result($result, 0, "salt");
			if ($salt == "") {
				$query = "SELECT id
	            FROM ttrss_users WHERE
					login = '$login' AND (pwd_hash = '$pwd_hash1' OR
					pwd_hash = '$pwd_hash2')";
				// verify and upgrade password to new salt base
				$result = db_query($query);
				if (db_num_rows($result) == 1) {
					// upgrade password to MODE2
					$salt = substr(bin2hex(get_random_bytes(125)), 0, 250);
					$pwd_hash = encrypt_password($password, $salt, true);
					db_query("UPDATE ttrss_users SET
						pwd_hash = '$pwd_hash', salt = '$salt' WHERE login = '$login'");
					$query = "SELECT id
		            FROM ttrss_users WHERE
						login = '$login' AND pwd_hash = '$pwd_hash'";
				} else {
					return false;
				}
			} else {
				$pwd_hash = encrypt_password($password, $salt, true);
				$query = "SELECT id
		         FROM ttrss_users WHERE
					login = '$login' AND pwd_hash = '$pwd_hash'";
			}
		} else {
			$query = "SELECT id
	         FROM ttrss_users WHERE
				login = '$login' AND (pwd_hash = '$pwd_hash1' OR
					pwd_hash = '$pwd_hash2')";
		}
		$result = db_query($query);
		if (db_num_rows($result) == 1) {
			return db_fetch_result($result, 0, "id");
		}
		return false;
	}
	function check_password($owner_uid, $password) {
		$owner_uid = db_escape_string($owner_uid);
		$result = db_query("SELECT salt,login FROM ttrss_users WHERE
			id = '$owner_uid'");
		$salt = db_fetch_result($result, 0, "salt");
		$login = db_fetch_result($result, 0, "login");
		if (!$salt) {
			$password_hash1 = encrypt_password($password);
			$password_hash2 = encrypt_password($password, $login);
			$query = "SELECT id FROM ttrss_users WHERE
				id = '$owner_uid' AND (pwd_hash = '$password_hash1' OR
				pwd_hash = '$password_hash2')";
		} else {
			$password_hash = encrypt_password($password, $salt, true);
			$query = "SELECT id FROM ttrss_users WHERE
				id = '$owner_uid' AND pwd_hash = '$password_hash'";
		}
		$result = db_query($query);
		return db_num_rows($result) != 0;
	}
	function change_password($owner_uid, $old_password, $new_password) {
		$owner_uid = db_escape_string($owner_uid);
		if ($this->check_password($owner_uid, $old_password)) {
			$new_salt = substr(bin2hex(get_random_bytes(125)), 0, 250);
			$new_password_hash = encrypt_password($new_password, $new_salt, true);
			db_query("UPDATE ttrss_users SET
				pwd_hash = '$new_password_hash', salt = '$new_salt', otp_enabled = false
					WHERE id = '$owner_uid'");
			$_SESSION["pwd_hash"] = $new_password_hash;
			return __("Password has been changed.");
		} else {
			return "ERROR: ".__('Old password is incorrect.');
		}
	}
	function api_version() {
		return 2;
	}
}
?>