Method isEncryptedFile

src/FileRise/Support/CryptoAtRest.php:167–185

(string $path)

    }

    public static function isEncryptedFile(string $path): bool
    {
        $h = @fopen($path, 'rb');
        if ($h === false) {
            return false;
        }
        $magic = @fread($h, 4);
        if (!is_string($magic) || strlen($magic) !== 4) {
            @fclose($h);
            return false;
        }
        if ($magic !== self::MAGIC) {
            @fclose($h);
            return false;
        }
        $ver = @fread($h, 1);
        @fclose($h);
        return (is_string($ver) && $ver !== '' && ord($ver) === self::VERSION);
    }

    /**
     * @return array{plainSize:int, header:string}|null