How Can I Encrypt and Decrypt Files Using PHP\'s mcrypt and the openssl Alternative?

Encrypting and Decrypting Files with PHP's mcrypt

Encrypting and decrypting files can enhance data security and protect sensitive information. mcrypt offers a convenient library for implementing encryption and decryption operations in PHP. However, since mcrypt is no longer actively maintained, it's essential to consider alternative options for encryption tasks.

In this article, we'll explore the use of mcrypt to encrypt and decrypt files. We'll also provide an updated example utilizing openssl, a recommended alternative to mcrypt.

Encrypting a File with mcrypt:

</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">function encryptFile() {
    global $cryptastic;
    $pass = PGPPASS;
    $salt = PGPSALT;
    $key = $cryptastic->pbkdf2($pass, $salt, 1000, 32) or die("Failed to generate secret key.");

    if ($handle = opendir(PATH.'/ftpd')) {
        while (false !== ($file = readdir($handle))) {
            if ($file != "." &amp;&amp; $file != "..") {
                $newfile = PATH.'/encrypted/'.$file.'.txt';
                $msg = file_get_contents(PATH.'/ftpd/'.$file);
                $encrypted = $cryptastic->encrypt($msg, $key) or die("Failed to complete encryption.");
                $nfile = fopen($newfile, 'w');
                fwrite($nfile, $encrypted);
                fclose($nfile);
                unlink(PATH.'/ftpd/'.$file);

            }
        }
        closedir($handle);
    }
}

Copy after login

Decrypting a File with mcrypt:

</p>
<div class="code" style="position:relative; padding:0px; margin:0px;"><pre class="brush:php;toolbar:false">function inFTP() {
    global $cryptastic;
    $pass = PGPPASS;
    $salt = PGPSALT;
    $key = $cryptastic->pbkdf2($pass, $salt, 1000, 32) or die("Failed to generate secret key.");

    if ($handle = opendir(PATH.'/encrypted')) {
        while (false !== ($file = readdir($handle))) {
            if ($file != "." &amp;&amp; $file != "..") {
                $newfile = PATH.'/decrypted/'.$file;
                $msg = PATH.'/encrypted/'.$file;
                $decrypted = $cryptastic->decrypt($msg, $key) or die("Failed to complete decryption.");
                $nfile = fopen($newfile, 'w');
                fwrite($nfile, $decrypted);
                fclose($nfile);
                //unlink(PATH.'/encrypted/'.$file);

            }
        }
        closedir($handle);
    }
}

Copy after login