PHP

Determine if a Zip is Encrypted or Password-Protected

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Determines whether or not a zip archive is AES encrypted or password-protected. Chilkat2 PHP

<?php

use Chilkat2\Zip;

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

$zip = new 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.

try {
    $zip->OpenZip('something.zip');
} catch (\Chilkat2\Exception $e) {
    echo $e->getMessage(), "\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 = $zip->PasswordProtect;
if ($bPwdProt) {
    echo "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) {
    echo "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();