This is from upstream where there is an assert() that EVP_MD_size(digest)
matches the length returned by HMAC(). We avoid asserts in our libraries.
From Martin Vahlensieck
-/* $OpenBSD: hkdf.c,v 1.4 2019/11/21 20:02:20 tim Exp $ */
+/* $OpenBSD: hkdf.c,v 1.5 2021/08/27 16:12:33 tb Exp $ */
/* Copyright (c) 2014, Google Inc.
*
* Permission to use, copy, modify, and/or distribute this software for any
#include <openssl/hkdf.h>
-#include <assert.h>
#include <string.h>
#include <openssl/err.h>