Add an HKDF (RFC 5869) implementation
diff --git a/include/mbedtls/error.h b/include/mbedtls/error.h
index 8b4d3a8..c7f6a72 100644
--- a/include/mbedtls/error.h
+++ b/include/mbedtls/error.h
@@ -4,7 +4,7 @@
* \brief Error to string translation
*/
/*
- * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
+ * Copyright (C) 2006-2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
@@ -88,6 +88,7 @@
* RSA 4 11
* ECP 4 9 (Started from top)
* MD 5 5
+ * HKDF 5 1 (Started from top)
* CIPHER 6 8
* SSL 6 17 (Started from top)
* SSL 7 31