From 30d45a17c59dc7dbf853da3085b71d466275bd0a Mon Sep 17 00:00:00 2001
From: Michael Osipov <michael.osipov@siemens.com>
Date: Tue, 28 May 2019 15:48:17 +0200
Subject: [PATCH] Make secure_zero_memory() compile on HP-UX

This reinstantiates the portable approach to this function dropped in
b4b241a34824b51956a7866606329a065d397525.
HP-UX does not have any of the fancy secure/explicit functions and the
compiler does not support the inline assembly syntax.
---
 src/blake2-impl.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/blake2-impl.h b/src/blake2-impl.h
index 801f1ae..115e66e 100644
--- a/src/blake2-impl.h
+++ b/src/blake2-impl.h
@@ -141,6 +141,9 @@ static inline void secure_zero_memory(void *v, size_t n)
 {
 #if defined(_WIN32) || defined(WIN32)
   SecureZeroMemory(v, n);
+#elif defined(__hpux)
+  static void *(*const volatile memset_v)(void *, int, size_t) = &memset;
+  memset_v(v, 0, n);
 #else
 // prioritize first the general C11 call
 #if defined(HAVE_MEMSET_S)