Remove Zip Encryption

Opens an encrypted zip archive and rewrites it with no encrypton.

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 != true) {
    print $zip->lastErrorText() . "\n";
    exit;
}

//  An encrypted .zip may be "opened" without providing a
//  password.  However, the contents cannot be unzipped
//  without setting the DecryptPassword property.
$success = $zip->OpenZip('myEncrypted.zip');
if ($success != true) {
    print $zip->lastErrorText() . "\n";
    exit;
}

//  Set the DecryptPassword property:
$zip->DecryptPassword = 'myPassword';

//  Indicate that when the zip is to be written again,
//  it should be neither AES encrypted, or password-protected
//  (i.e. older Zip 2.0 encryption)
$zip->Encryption = 0;
$zip->PasswordProtect = false;

//  Set the filename of the new unencrypted .zip to be written:
$zip->FileName = 'unencrypted.zip';

//  Write the unencrypted .zip
//  What happens during WriteZipAndClose?  --
//  The encrypted entries from myEncrypted.zip are streamed in,
//  decrypted, and then written out directly into unencrypted.zip
//  In other words, internally the component is smart enough
//  to stream the data from the existing .zip to the new .zip
//  automatically, decrypting in the process..
$success = $zip->WriteZipAndClose();
if ($success != true) {
    print $zip->lastErrorText() . "\n";
    exit;
}

print 'OK!' . "\n";

?>