Add a return value to prf_plus_t.get_bytes()

src/libstrongswan/crypto/prf_plus.c

@@ -57,7 +57,7 @@ struct private_prf_plus_t {
 	chunk_t buffer;
 };
 
-METHOD(prf_plus_t, get_bytes, void,
+METHOD(prf_plus_t, get_bytes, bool,
 	private_prf_plus_t *this, size_t length, u_int8_t *buffer)
 {
 	size_t round, written = 0;
@@ -87,6 +87,7 @@ METHOD(prf_plus_t, get_bytes, void,
 		this->used += round;
 		written += round;
 	}
+	return TRUE;
 }
 
 METHOD(prf_plus_t, allocate_bytes, bool,
@@ -95,12 +96,9 @@ METHOD(prf_plus_t, allocate_bytes, bool,
 	if (length)
 	{
 		*chunk = chunk_alloc(length);
-		get_bytes(this, length, chunk->ptr);
-	}
-	else
-	{
-		*chunk = chunk_empty;
+		return get_bytes(this, length, chunk->ptr);
 	}
+	*chunk = chunk_empty;
 	return TRUE;
 }
 

src/libstrongswan/crypto/prf_plus.h

@@ -36,8 +36,10 @@ struct prf_plus_t {
 	 *
 	 * @param length	number of bytes to get
 	 * @param buffer	pointer where the generated bytes will be written
+	 * @return			TRUE if bytes generated successfully
 	 */
-	void (*get_bytes) (prf_plus_t *this, size_t length, u_int8_t *buffer);
+	__attribute__((warn_unused_result))
+	bool (*get_bytes) (prf_plus_t *this, size_t length, u_int8_t *buffer);
 
 	/**
 	 * Allocate pseudo random bytes.