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

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

Download Chilkat 32-bit Zip ActiveX (.msi) (includes objects for .zip, .gz, .bz2, and .Z)

Download All 32-bit Chilkat ActiveX Components (.zip)

Download All 64-bit Chilkat ActiveX Components (.zip)

<?php

$zip = new COM("Chilkat.Zip2");

//  Any string unlocks the component for the 1st 30-days.
$success = $zip->UnlockComponent('Anything for 30-day trial');
if ($success != 1) {
    print $zip->lastErrorText() . "\n";
    exit;
}

//  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 != 1) {
    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 1
$bPwdProt = $zip->PasswordProtect;
if ($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 = $zip->Encryption;
if ($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.

//  If the Encryption property = 1, 2, or 3, then the zip was
//  encrypted using AES, Blowfish, or Twofish using a
//  Chilkat-specific encryption format that was implemented
//  prior to the publication of the Zip AES standard.

$zip->CloseZip();
?>