From 1fdd8749014cf390d6ea9dd4350146473362044e Mon Sep 17 00:00:00 2001
From: Werner Koch <wk@gnupg.org>
Date: Tue, 6 Feb 2024 16:58:24 +0100
Subject: core: New function gpgrt_wipememory.

* src/init.c (_gpgrt_wipememory): New.
* src/visibility.c (gpgrt_wipememory): New.
* src/visibility.h: Add it.
* src/gpg-error.def.in: Ditto.
* src/gpg-error.vers: Ditto.
--

GnuPG-bug-id: 6954
---
 src/init.c | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src/init.c')

diff --git a/src/init.c b/src/init.c
index 493e3ba..c4b7e56 100644
--- a/src/init.c
+++ b/src/init.c
@@ -412,6 +412,25 @@ _gpgrt_free (void *a)
 }
 
 
+void
+_gpgrt_wipememory (void *ptr, size_t len)
+{
+  if (ptr && len)
+    {
+#if defined(HAVE_W32_SYSTEM) && defined(SecureZeroMemory)
+      SecureZeroMemory (ptr, len);
+#elif defined(HAVE_EXPLICIT_BZERO)
+      explicit_bzero (ptr, len);
+#else
+      /* Prevent compiler from optimizing away the call to memset by
+       * accessing memset through volatile pointer. */
+      static void *(*volatile memset_ptr)(void *, int, size_t) = (void *)memset;
+      memset_ptr (ptr, 0, len);
+#endif
+    }
+}
+
+
 void
 _gpg_err_set_errno (int err)
 {
-- 
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