code: function createAuthKeyID(context) {
      var authKeyHash = utility.createSHAHash(context.authKeyValue);
      var authKeyAuxHash = authKeyHash.slice(0, 8);
      var authKeyID = authKeyHash.slice(-8);
      if (logger.isDebugEnabled()) {
          logger.debug('authKeyID(%s) = %s', authKeyID.length, authKeyID.toString('hex'));
      }
      context.authKeyID = authKeyID;
      context.authKeyAuxHash = authKeyAuxHash;
      return context;
  }
docs: Calculate AuthKey hash and ID