(PHP Extension) Determine if a Zip is Encrypted or Password-Protected

Determines whether or not a zip archive is AES encrypted or password-protected.

Chilkat PHP Downloads PHP Extension for Windows, Linux, MacOS, Alpine Linux, Solaris

<?php

// The version number (9_5_0) should match version of the Chilkat extension used, omitting the micro-version number.
// For example, if using Chilkat v9.5.0.48, then include as shown here:
include("chilkat_9_5_0.php");

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

$zip = new CkZip();

// An encrypted or password-protected zip can be opened
// without specifying the password.  However, the contents
// of the files cannot be unzipped without providing the correct
// password.

$success = $zip->OpenZip('something.zip');
if ($success != true) {
    print $zip->lastErrorText() . "\n";
    exit;
}

// If the zip is password-protected, meaning that it uses
// the old (insecure) Zip 2.0 encryption, then the
// PasswordProtect property will be true
$bPwdProt = $zip->get_PasswordProtect();
if ($bPwdProt) {
    print 'This zip is password-protected.' . "\n";
}

// If the zip is AES encrypted (WinZip compatible) then
// the Encryption property will be equal to 4.
$encValue = $zip->get_Encryption();
if ($encValue == 4) {
    print 'This zip is AES encrypted.' . "\n";
}

// If the Encryption property = 0, then the zip is NOT
// strong encrypted, and is either password-protected or
// entirely unencrypted, depending on the value of the
// PasswordProtect property.

$zip->CloseZip();

?>