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<?php
final class Encryption {
	public function encrypt($key, $value) {
		// Remove the base64 encoding from our key
		$encryption_key = base64_decode($value);
		
		// Generate an initialization vector		
		$iv = openssl_random_pseudo_bytes(openssl_cipher_iv_length('aes-256-gcm'));
		
		// Encrypt the data using AES 256 encryption in GCM mode using our encryption key and initialization vector.
		if (in_array('aes-256-gcm', openssl_get_cipher_methods())) {
		    $tag = base64_encode($iv);
		    
		    $encrypted = openssl_encrypt($key, 'aes-256-gcm', $encryption_key, 0, $iv, $tag);		   
		    
		    // The $iv is just as important as the key for decrypting, so save it with our encrypted data using a unique separator (::)		
		    return base64_encode($encrypted . '::' . $iv);
		}
	}
	
	public function decrypt($key, $value) {
	       if (in_array('aes-256-gcm', openssl_get_cipher_methods())) {
		    // Remove the base64 encoding from our key
		    $encryption_key = base64_decode($value);
		
  		    // To decrypt, split the encrypted data from our IV - our unique separator used was "::"
		    list($encrypted_data, $iv) = explode('::', base64_decode($key), 2);
		    
		    $tag = base64_decode($iv);
		    
		    return openssl_decrypt($encrypted_data, 'aes-256-gcm', $encryption_key, 0, $iv, $tag);
	      }
       }
}
?>

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define('DB_DRIVER', 'mysql');

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define('DB_DRIVER', 'mysqli');