Asymmetric crypt algorithm (gnupg)

This project aims to provide simple encryption method for using asymmetric gnupg (pgp) crypt algorithm.
The idea behind this is to have a way for encrypting data by using public key without even possibility to decrypt it on server side, because there is no private key within a server's filesystem at all.

How to use this module:

Use admin/config/system/gpg_acrypt for adding your public key.

There is only one function

function acrypt_gpg_encrypt($src_filename, $dest_filename = NULL, $gpg_pub_key = NULL);

that can be used as

$source_file = 'private://webform_export_471.csv';
$encrypted_file = 'public://webform_export_471.csv.gpg';

$status = acrypt_gpg_encrypt($source_file, $encrypted_file);

if ($status) {
  // Removing source file for security.
  unlink($source_file);
}

You can check encrypted file at $encrypted_file path

PS. For decryption you can use console gpg app

gpg --output webform_export_471.csv --decrypt webform_export_471.csv.gpg
where decrypted data will be saved to webform_export_471.csv file.

Tip - do not decrypt files on the same server where you were encrypted them. Unfortunately there is a chance you forget about removing private key, adding security hole as well.