Field HMAC

This module is meant to easily allow a Drupal developer to configure per-entity message authentication codes.

Once configured a new property will be available on entities (and in Views) that contains the HMAC.

Note: Currently only supports node entities.

Configuration

• Install and enable the module
• Navigate to the content type configuration form for the desired content types
• Enable the HMAC checkbox under the "Field HMAC" tab
• Select a field or property
• Enter a secret key

Example usage

  // Assumes HMAC has been configured.
  $wrapper = entity_metadata_wrapper('node', 123);
  $hmac = $wrapper->hmac->value();

  // Do something/validate with HMAC.
  dpm($hmac);

See other

https://en.wikipedia.org/wiki/Hash-based_message_authentication_code