performance issue

[arist1213]

This is my local test, which data_x represents how much megabits to be encrypt.
I generated from 1 to 100 megabits to data directory, below is some test results. It's used huge memory and time to encrypt data.

test tools
https://github.com/Svish/TimerPHP
/my/path/to/test_xxtea/test_xxtea.php()
│
│ 78.502 s
│ 6.58 KiB, 1.14 GiB
│
├ test_encrypt()
│ │
│ │ 78.502 s
│ │ 5.86 KiB, 1.14 GiB
│ │
│ ├ test_encrypt(data/data_10)
│ │ │
│ │ │ 12.831 s
│ │ │ 1.44 KiB, 855.50 MiB
│ │ ─┘
│ │
│ ├ test_encrypt(data/data_11)
│ │ │
│ │ │ 14.563 s
│ │ │ 160.00 B, 934.50 MiB
│ │ ─┘
│ │
│ ├ test_encrypt(data/data_12)
│ │ │
│ │ │ 15.647 s
│ │ │ 144.00 B, 1013.50 MiB
│ │ ─┘
│ │
│ ├ test_encrypt(data/data_13)
│ │ │
│ │ │ 16.984 s
│ │ │ 144.00 B, 1.07 GiB
│ │ ─┘
│ │
│ ├ test_encrypt(data/data_14)
│ │ │
│ │ │ 18.477 s
│ │ │ 144.00 B, 1.14 GiB
│ │ ─┘
│ ─┘

test_xxtea_script.php

<?php
include 'Xxtea.class.php';
include 'Timer.php';

function p($message = '', $tag = 'debug') {
    echo '['. $tag .']'. " ". $message ."\n";
}

function generateData($meta=1)
{
    // 1024
    $str = str_repeat(str_repeat('y', pow(2, 10)), $meta*1024);
    $file_name = 'data/data_'.$meta;
    file_put_contents($file_name, $str);
    p("generate ".$meta." M data to ".$file_name, 'generate data');
    unset($str);
}

function test_encrypt($start, $end) 
{
    Timer::start('test_encrypt');
    for($i = $start; $i < $end; $i++)
    {        
        $file_name = "data/data_".$i;
        p($file_name, 'before encrypt');
        Timer::start("test_encrypt", [$file_name]);      
        $encrypt_data = null;    
        if (file_exists($file_name))
        {
            $encrypt_data = xxtea_encrypt(file_get_contents($file_name));
            file_put_contents("data_enrypt/data_".$i."_enrypted", $encrypt_data);
        }
        unset($encrypt_data);
        p($file_name, 'after encrypt');
        // Sub section stuff
        Timer::stop();
    }
}
$start = 10;
$end = 15;
Timer::start($_SERVER['PHP_SELF']);
test_encrypt($start, $end);
Timer::stop();
echo $result = Timer::result();
file_put_contents("result_".$start."_".$end.".txt", $result);

[andot]

You can use xxtea-pecl to instead this pure php implementation.