Add freezero support

3 files changed, 22 insertions, 0 deletions

diff --git a/crypto/CMakeLists.txt b/crypto/CMakeLists.txt
index d7b65e2..028d840 100644
--- a/crypto/CMakeLists.txt
+++ b/crypto/CMakeLists.txt
@@ -681,6 +681,11 @@ if(NOT HAVE_ASPRINTF)
         set(EXTRA_EXPORT ${EXTRA_EXPORT} vasprintf)
 endif()
 
+if(NOT HAVE_FREEZERO)
+        set(CRYPTO_SRC ${CRYPTO_SRC} compat/freezero.c)
+        set(EXTRA_EXPORT ${EXTRA_EXPORT} freezero)
+endif()
+
 if(NOT HAVE_GETPAGESIZE)
         set(CRYPTO_SRC ${CRYPTO_SRC} compat/getpagesize.c)
 endif()
diff --git a/crypto/Makefile.am b/crypto/Makefile.am
index 04b67aa..0e7f9c8 100644
--- a/crypto/Makefile.am
+++ b/crypto/Makefile.am
@@ -84,6 +84,10 @@ if !HAVE_ASPRINTF
 libcompat_la_SOURCES += compat/bsd-asprintf.c
 endif
 
+if !HAVE_FREEZERO
+libcompat_la_SOURCES += compat/freezero.c
+endif
+
 if !HAVE_GETPAGESIZE
 libcompat_la_SOURCES += compat/getpagesize.c
 endif
diff --git a/crypto/compat/freezero.c b/crypto/compat/freezero.c
new file mode 100644
index 0000000..8becc00
--- /dev/null
+++ b/crypto/compat/freezero.c
@@ -0,0 +1,13 @@
+#include <string.h>
+#include <stdlib.h>
+
+void
+freezero(void *ptr, size_t sz)
+{
+        /* This is legal. */
+        if (ptr == NULL)
+                return;
+
+        explicit_bzero(ptr, sz);
+        free(ptr);
+}