Optionally disable encryption when saving keys

src/Admin/Settings.php

@@ -87,6 +87,14 @@ public function get_settings( $tab ) {
 						'default' => 'no',
 						'type'    => 'checkbox',
 					],
+					[
+						'title' => __( 'Disable encryption', 'wc-serial-numbers' ),
+						'id'    => 'wc_serial_numbers_disable_encryption',
+						'desc'  => __( 'Store serial keys in database as plaintext.', 'wc-serial-numbers' ),
+						'desc_tip' => __( 'If this options is enabled, keys will not be stored in encrypted form.', 'wc-serial-numbers' ),
+						'default' => 'no',
+						'type'  => 'checkbox',
+					],
 					[
 						'type' => 'sectionend',
 						'id'   => 'section_serial_numbers',

src/Encryption.php

@@ -65,11 +65,11 @@ public function __construct() {
 	 * @return false|string
 	 */
 	public static function maybeEncrypt( $key ) {
-		if ( ! self::isEncrypted( $key ) ) {
-			return self::encrypt( $key );
+		if(self::isEncrypted( $key ) || 'yes' == wc_serial_numbers_encryption_disabled()) {
+			return $key;
 		}
 
-		return $key;
+		return self::encrypt( $key );
 	}
 
 	/**

src/Installer.php

@@ -279,6 +279,7 @@ protected function update_120() {
 		$options               = [
 			'wc_serial_numbers_autocomplete_order'            => $this->update_1_2_0_get_option( 'wsn_auto_complete_order', 'yes', 'wsn_delivery_settings' ),
 			'wc_serial_numbers_reuse_serial_number'           => $this->update_1_2_0_get_option( 'wsn_re_use_serial', 'no', 'wsn_delivery_settings' ),
+			'wc_serial_numbers_disable_encryption'            => 'no',
 			'wc_serial_numbers_disable_software_support'      => 'no',
 			'wc_serial_numbers_manual_delivery'               => 'no',
 			'wc_serial_numbers_hide_serial_number'            => 'yes',

src/functions.php

@@ -867,6 +867,18 @@ function wcsn_decrypt_key( $key ) {
 	return Encryption::maybeDecrypt( $key );
 }
 
+/**
+ * Check if encryption is disabled (i.e, for real physical product serial numbers)
+ *
+ * @param $product_id
+ *
+ * @return bool
+ * @since 1.x.x
+ */
+function wc_serial_numbers_encryption_disabled() {
+	return 'yes' == get_option( 'wc_serial_numbers_disable_encryption' );
+}
+
 /**
  * Get product stocks
  *