(PHP ActiveX) Encrypt Already Existing Zip

To encrypt an already existing non-encrypted .zip, the application must open the .zip, set the encryption related properties, and then re-write.

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 requires the Chilkat Zip API to have been previously unlocked.
// See Unlock Chilkat Zip for sample code.

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

// Open an unencrypted .zip
$success = $zip->OpenZip('qa_data/zips/test.zip');
if ($success != 1) {
    print $zip->LastErrorText . "\n";
    exit;
}

// Unzip to a temp directory.
$numFilesUnzipped = $zip->Unzip('qa_output/tmp');
if ($numFilesUnzipped < 0) {
    print $zip->LastErrorText . "\n";
    exit;
}

// Clear the zip object.
$zip->NewZip('qa_output/aesTest.zip');

// Indicate that 128-bit AES encryption is to be used when writing the .zip
$zip->Encryption = 4;
$zip->EncryptKeyLength = 128;

// Set the password.
$zip->EncryptPassword = 'secret';

// Append the files.
$zip->AppendFromDir = 'qa_output/tmp';
$success = $zip->AppendFiles('*.*',1);
if ($success != 1) {
    print $zip->LastErrorText . "\n";
    exit;
}

// Write the .zip and close it.
$success = $zip->WriteZipAndClose();
if ($success != 1) {
    print $zip->LastErrorText . "\n";
    exit;
}

print 'Success.' . "\n";

?>