Create an encrypted zip archive with PHP

Question

I am searching for a way to encrypt a .txt file into a zip, but in a secure password protected way. My goal is to email this file to me, without anyone being able to read th

Answer 1

More and more tools are supporting AES-encrypted ZIP files. It works, it's secure.

EDIT2: You can use DotNetZip from PHP to dynamically generate AES-encrypted zip archives from PHP. DotNetZip is a .NET library that is designed for .NET languages (C#, VB, etc). It runs only on Windows :(. But DotNetZip does AES, and it's free, and it works from PHP.

This is the code I used. (PHP v5.2.9 on Win32)

Name = $zipOutput;
  $dirToZip= "c:\\temp\\psh";
  # Encryption:  3 => 256-bit AES.  
  #     2 => 128-bit AES.  
  #     1 => PKZIP (Weak).  
  #     0 => None
  $zip->Encryption = 3;
  $zip->Password = "AES-Encryption-Is-Secure";
  $zip->AddDirectory($dirToZip);
  $zip->Save();
  $zip->Dispose();

  if (file_exists($zipOutput))
  {
    header('Cache-Control: no-cache, must-revalidate');
    header('Content-Type: application/x-zip'); 
    header('Content-Disposition: attachment; filename=' . $fname);
    header('Content-Length: ' . filesize($zipOutput));
    readfile($zipOutput);
    unlink($zipOutput);
  }
  else 
  {
    echo '';
    echo '  ';
    echo '  ';
    echo '  ';
    echo '  ';
    echo '';
    echo '
Whoops!
' . "
\n";
    echo '
The file was not successfully generated.
';
    echo '';
    echo '';
  } 
}
catch (Exception $e) 
{
    echo '';
    echo '  ';
    echo '  ';
    echo '  ';
    echo '  ';
    echo '';
    echo '
Whoops!
' . "
\n";
    echo '
The file was not successfully generated.
';
    echo '
Caught exception: ',  $e->getMessage(), '
', "\n";
    echo '
';
    echo $e->getTraceAsString(), "\n";
    echo '
';
    echo '';
    echo '';
}

?>

I had to modify DotNetZip to make it work with PHP: I had to make the Name property read/write, and I had to make it COM-callable. This change is first available in the v1.8.2.3 release.