Index: gnutls-3.6.15/lib/fips.c
===================================================================
--- gnutls-3.6.15.orig/lib/fips.c	2020-09-03 16:59:05.000000000 +0200
+++ gnutls-3.6.15/lib/fips.c	2020-11-10 12:51:40.420071675 +0100
@@ -398,6 +398,28 @@ int _gnutls_fips_perform_self_checks2(vo
 		goto error;
 	}
 
+        /* KDF */
+
+	char derived[512];
+
+	gnutls_datum_t secret = { (void *)"\x04\x50\xb0\xea\x9e\xcd\x36\x02\xee\x0d\x76\xc5\xc3\xc8\x6f\x4a", 16 };
+	gnutls_datum_t seed = { (void *)"\x20\x7a\xcc\x02\x54\xb8\x67\xf5\xb9\x25\xb4\x5a\x33\x60\x1d\x8b", 16 };
+	gnutls_datum_t label = { (void *)"test label", 10 };
+	gnutls_datum_t expected = { (void *)"\xae\x67\x9e\x0e\x71\x4f\x59\x75\x76\x37\x68\xb1\x66\x97\x9e\x1d", 16 };
+
+	ret = _gnutls_prf_raw(GNUTLS_MAC_SHA256, secret.size, secret.data,
+		label.size, (char*)label.data, seed.size, seed.data, expected.size, derived);
+	if (ret < 0) {
+		gnutls_assert();
+		goto error;
+	}
+
+	ret = memcmp(derived, expected.data, expected.size);
+	if (ret != 0) {
+		gnutls_assert();
+		goto error;
+	}
+
 	/* PK */
 	ret = gnutls_pk_self_test(0, GNUTLS_PK_RSA);
 	if (ret < 0) {