From e565d9bbda7a2dbd059bb147feab06005ea4f73e Mon Sep 17 00:00:00 2001
From: dehanj <hansson@tillitis.se>
Date: Mon, 22 Jan 2024 13:33:26 +0100
Subject: [PATCH] Add secure_wipe()

---
 include/tkey/lib.h | 1 +
 libcommon/lib.c    | 7 +++++++
 2 files changed, 8 insertions(+)

diff --git a/include/tkey/lib.h b/include/tkey/lib.h
index b94809b..deb7b77 100644
--- a/include/tkey/lib.h
+++ b/include/tkey/lib.h
@@ -13,4 +13,5 @@ void memcpy_s(void *dest, size_t destsize, const void *src, size_t n);
 void *wordcpy(void *dest, const void *src, unsigned n);
 void wordcpy_s(void *dest, size_t destsize, const void *src, size_t n);
 int memeq(void *dest, const void *src, size_t n);
+void secure_wipe(void *v, size_t n);
 #endif
diff --git a/libcommon/lib.c b/libcommon/lib.c
index 154e306..b2da3eb 100644
--- a/libcommon/lib.c
+++ b/libcommon/lib.c
@@ -82,3 +82,10 @@ int memeq(void *dest, const void *src, size_t n)
 
 	return res;
 }
+
+void secure_wipe(void *v, size_t n)
+{
+	volatile uint8_t *p = (volatile uint8_t *)v;
+	while (n--)
+		*p++ = 0;
+}