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

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows Note: The php_com_dotnet.dll may need to be enabled inside of php.ini.

<?php

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

// For versions of Chilkat < 10.0.0, use new COM('Chilkat_9_5_0.Chilkat.Zip')
$zip = new COM("Chilkat.Zip");

// 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.

$zip->CloseZip();

?>