diff -ruN ssh-/Makefile.inc ssh/Makefile.inc
--- ssh-/Makefile.inc Mon Apr 2 05:56:14 2018
+++ ssh/Makefile.inc Mon Apr 2 06:02:20 2018
SRCS_KEXS+= kexc25519s.c
SRCS_KEY+= sshkey.c
+SRCS_KEY+= freezero.c
SRCS_KEY+= sshbuf-misc.c
SRCS_KEY+= cipher.c
SRCS_KEY+= cipher-chachapoly.c
diff -ruN ssh-/freezero.c ssh/freezero.c
--- ssh-/freezero.c Thu Jan 1 00:00:00 1970
+++ ssh/freezero.c Mon Apr 2 06:04:48 2018
@@ -0,0 +1,14 @@
+/* Public domain */
+
+#include <sys/types.h>
+#include <string.h>
+#include <stdlib.h>
+
+void freezero(void *p, size_t s);
+
+void
+freezero(void *p, size_t s)
+{
+ explicit_bzero(p, s);
+ free(p);
+}
diff -ruN ssh-/ssh-rsa.c ssh/ssh-rsa.c
--- ssh-/ssh-rsa.c Mon Apr 2 05:56:14 2018
+++ ssh/ssh-rsa.c Mon Apr 2 06:03:06 2018
@@ -30,6 +30,8 @@
#include "digest.h"
#include "log.h"
+void freezero(void *, size_t);
+
static int openssh_RSA_verify(int, u_char *, size_t, u_char *, size_t, RSA *);
static const char *
diff -ruN ssh-/sshd.c ssh/sshd.c
--- ssh-/sshd.c Mon Apr 2 05:56:14 2018
+++ ssh/sshd.c Mon Apr 2 06:03:12 2018
@@ -105,6 +105,8 @@
#include "version.h"
#include "ssherr.h"
+void freezero(void *, size_t);
+
/* Re-exec fds */
#define REEXEC_DEVCRYPTO_RESERVED_FD (STDERR_FILENO + 1)
#define REEXEC_STARTUP_PIPE_FD (STDERR_FILENO + 2)
diff -ruN ssh-/sshkey.c ssh/sshkey.c
--- ssh-/sshkey.c Mon Apr 2 05:56:14 2018
+++ ssh/sshkey.c Mon Apr 2 06:02:45 2018
@@ -56,6 +56,8 @@
#include "xmss_fast.h"
+void freezero(void *, size_t);
+
/* openssh private key file format */
#define MARK_BEGIN "-----BEGIN OPENSSH PRIVATE KEY-----\n"
#define MARK_END "-----END OPENSSH PRIVATE KEY-----\n"
