From c66d80a4381f0b492fd62e87deb88944b77efd22 Mon Sep 17 00:00:00 2001
From: Brent Cook <bcook@openbsd.org>
Date: Mon, 3 Aug 2015 06:56:59 -0500
Subject: [PATCH] add win32-specific explicit_bzero implementation

---
 .gitignore                         |  1 +
 crypto/Makefile.am                 |  4 ++++
 crypto/compat/explicit_bzero_win.c | 13 +++++++++++++
 3 files changed, 18 insertions(+)
 create mode 100644 crypto/compat/explicit_bzero_win.c

diff --git a/.gitignore b/.gitignore
index 7efedef..5d7c5ba 100644
--- a/.gitignore
+++ b/.gitignore
@@ -120,6 +120,7 @@ include/openssl/*.he
 !/crypto/Makefile.am.*
 !/crypto/compat/arc4random.h
 !/crypto/compat/b_win.c
+!/crypto/compat/explicit_bzero_win.c
 !/crypto/compat/posix_win.c
 !/crypto/compat/bsd_asprintf.c
 !/crypto/compat/inet_pton.c
diff --git a/crypto/Makefile.am b/crypto/Makefile.am
index b988d77..26d30d9 100644
--- a/crypto/Makefile.am
+++ b/crypto/Makefile.am
@@ -34,8 +34,12 @@ libcompatnoopt_la_CFLAGS = -O0
 libcompatnoopt_la_SOURCES =
 
 if !HAVE_EXPLICIT_BZERO
+if HOST_WIN
+libcompatnoopt_la_SOURCES += compat/explicit_bzero_win.c
+else
 libcompatnoopt_la_SOURCES += compat/explicit_bzero.c
 endif
+endif
 
 # other compatibility functions
 libcompat_la_SOURCES =
diff --git a/crypto/compat/explicit_bzero_win.c b/crypto/compat/explicit_bzero_win.c
new file mode 100644
index 0000000..0d09d90
--- /dev/null
+++ b/crypto/compat/explicit_bzero_win.c
@@ -0,0 +1,13 @@
+/*
+ * Public domain.
+ * Win32 explicit_bzero compatibility shim.
+ */
+
+#include <windows.h>
+#include <string.h>
+
+void
+explicit_bzero(void *buf, size_t len)
+{
+	SecureZeroMemory(buf, len);
+}