3v4l.org

run code in 300+ PHP versions simultaneously

@ 2022-09-23T15:55:59Z

<?php
function test_native() {
    $st = hrtime(true);
    $h = hash_pbkdf2('sha256', 'password', 'salt', 100000);
    $et = hrtime(true);
    return [$h, $et - $st];
}
function test_emulated() {
    $st = hrtime(true);
    $K = str_pad('password', 64, "\0");
    $K ^= str_repeat("\x36", 64);
    $ictx = hash_init('sha256');
    hash_update($ictx, $K);
    $K ^= str_repeat("\x6a", 64);
    $octx = hash_init('sha256');
    hash_update($octx, $K);
    $DK = str_repeat("\0", 32);
    $prev = "salt\0\0\0\1";
    for ($j = 0; $j < 100000; ++$j) {
        $ctx = hash_copy($ictx);
        hash_update($ctx, $prev);
        $temp = hash_final($ctx, true);
        $ctx = hash_copy($octx);
        hash_update($ctx, $temp);
        $prev = hash_final($ctx, true);
        $DK ^= $prev;
    }
    $h = bin2hex($DK);
    $et = hrtime(true);
    return [$h, $et - $st];
}
$nr = test_native();
$er = test_emulated();
var_dump($nr[0]);
var_dump($er[0]);
var_dump($nr[1] <= $er[1]);

Output for 8.1.10 - 8.1.33, 8.2.10 - 8.2.29, 8.3.0 - 8.3.28, 8.4.3, 8.4.12 - 8.4.13, 8.5.0 - 8.5.1: string(64) "0394a2ede332c9a13eb82e9b24631604c31df978b4e2f0fbd2c549944f9d79a5" string(64) "0394a2ede332c9a13eb82e9b24631604c31df978b4e2f0fbd2c549944f9d79a5" bool(false)
Output for 8.4.15: /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libm.so.6: version `GLIBC_2.35' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.34' not found (required by /bin/php-8.4.15) /bin/php-8.4.15: /usr/lib/libc.so.6: version `GLIBC_2.38' not found (required by /bin/php-8.4.15)
Process exited with code 1.
Output for 8.4.1 - 8.4.2, 8.4.4 - 8.4.11, 8.4.14: string(64) "0394a2ede332c9a13eb82e9b24631604c31df978b4e2f0fbd2c549944f9d79a5" string(64) "0394a2ede332c9a13eb82e9b24631604c31df978b4e2f0fbd2c549944f9d79a5" bool(true)

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119.53 ms | 409 KiB | 5 Q