/**
* GnuPG encrypt a message using the recipient public key and optionally sign
* http://devzone.zend.com/article/3753-Using-GnuPG-with-PHP
* NOTE: GnuPG must be installed and configured with PHP.
* The recipient must be in your public key ring
* @param string $recipient Recipient Indentity (e.g. email address)
* @param string $message Message to encrypt
* @param string $sender Sender Identity
* @param string $senderKey Key Sender Secret Key (Only required if signing)
* @param boolean $binary Output in binary (non-ASCII armored)
* @return string
*/
public static function _encryptGnuPG($recipient, $message, $sender = FALSE, $senderKey = '', $binary = FALSE)
{
// Create new GnuPG object
$gpg = new \gnupg();
// Set error mode
$gpg->seterrormode(\gnupg::ERROR_EXCEPTION);
// If binary
if ($binary) {
// Turn off armored mode
$gpg->setarmor(0);
}
// Add the recipient encryption key
$gpg->addencryptkey($recipient);
// If there is a sender
if ($sender !== FALSE) {
// Add signature
$gpg->addsignkey($sender, $senderKey);
// Return encrypted and signed data
return $gpg->encryptsign($message);
}
// Return encrypted data
return $gpg->encrypt($message);
}
