Add a return value to prf_t.get_bytes()

src/libstrongswan/crypto/prfs/mac_prf.c

@@ -35,10 +35,11 @@ struct private_prf_t {
 	mac_t *mac;
 };
 
-METHOD(prf_t, get_bytes, void,
+METHOD(prf_t, get_bytes, bool,
 	private_prf_t *this, chunk_t seed, u_int8_t *buffer)
 {
 	this->mac->get_mac(this->mac, seed, buffer);
+	return TRUE;
 }
 
 METHOD(prf_t, allocate_bytes, void,

src/libstrongswan/crypto/prfs/prf.h

@@ -71,13 +71,16 @@ extern enum_name_t *pseudo_random_function_names;
  * Generic interface for pseudo-random-functions.
  */
 struct prf_t {
+
 	/**
 	 * Generates pseudo random bytes and writes them in the buffer.
 	 *
 	 * @param seed		a chunk containing the seed for the next bytes
 	 * @param buffer	pointer where the generated bytes will be written
+	 * @return			TRUE if bytes generated successfully
 	 */
-	void (*get_bytes) (prf_t *this, chunk_t seed, u_int8_t *buffer);
+	__attribute__((warn_unused_result))
+	bool (*get_bytes) (prf_t *this, chunk_t seed, u_int8_t *buffer);
 
 	/**
 	 * Generates pseudo random bytes and allocate space for them.