From Anorexic Hog, 6 Months ago, written in PHP.
This paste is a reply to Untitled from Unique Hornbill
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<?php
function encrypt($plaintext, $password)
{
    $method     = "AES-256-CBC";
    $key        = hash('sha256', $password, true);
    $iv         = openssl_random_pseudo_bytes(16);
    $ciphertext = openssl_encrypt($plaintext, $method, $key, OPENSSL_RAW_DATA, $iv);
    $hash       = hash_hmac('sha256', $ciphertext, $key, true);
    return $iv . $hash . $ciphertext;
}
function decrypt($ivHashCiphertext, $password)
{
    $method     = "AES-256-CBC";
    $iv         = substr($ivHashCiphertext, 0, 16);
    $hash       = substr($ivHashCiphertext, 16, 32);
    $ciphertext = substr($ivHashCiphertext, 48);
    $key        = hash('sha256', $password, true);
    if (hash_hmac('sha256', $ciphertext, $key, true) !== $hash)
        return null;
    return openssl_decrypt($ciphertext, $method, $key, OPENSSL_RAW_DATA, $iv);
}

function new_license(){

}

function validate_license($lic){
        $license=explode("-", $lic);
        //print_r($license);
;
        echo "\n".cntrl_summ($license['2'],0);
        //echo          cntrl_summ($license['2'],0);
}

function cntrl_summ ($num, $num_old, $last_num=false){
         $x = (int)$num;
         $s = 0; 
         while ($x <> 0) {
                 $s = $s + $x % 10; 
                 $x = fmod($x ,10 );
                 echo $x;
         }
         if ($x==0) {
                 echo 0;
         } else echo 1;
}


$k  = 'https://mlx.su/'.'. md5(rand());
$sn = sha1('1314-6685-000-65908');

echo base64_encode(encrypt($k, $sn));
validate_license('1314-6685-000-65908');    

A PHP Error was encountered

Severity: Core Warning

Message: PHP Startup: Unable to load dynamic library '/usr/lib/php/20170718/mcrypt.so' (tried: /usr/lib/php/20170718/mcrypt.so (/usr/lib/php/20170718/mcrypt.so: cannot open shared object file: No such file or directory), /usr/lib/php/20170718//usr/lib/php/20170718/mcrypt.so.so (/usr/lib/php/20170718//usr/lib/php/20170718/mcrypt.so.so: cannot open shared object file: No such file or directory))

Filename: Unknown

Line Number: 0

Backtrace: