@@ -60,14 +60,14 @@
  * The size of the buffer depends on the hash used. The buffer is part of the
  * receiver's memory pool.
  *
  * @return A buffer containing the hash
  */
-- (uint8_t*)digest OF_RETURNS_INNER_POINTER;
+- (const uint8_t*)digest OF_RETURNS_INNER_POINTER;
 
 /*!
  * @brief Returns a boolean whether the hash has already been calculated.
  *
  * @return A boolean whether the hash has already been calculated
  */
 - (bool)isCalculated;
 @end