diff --git a/cbits/cryptonite_sysrand.c b/cbits/cryptonite_sysrand.c
new file mode 100644
index 0000000..05434ef
--- /dev/null
+++ b/cbits/cryptonite_sysrand.c
@@ -0,0 +1,45 @@
+/*
+ * Copyright (C) 2015 Vincent Hanquez <tab@snarc.org>
+ *
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the names of his contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <stdint.h>
+#include <sys/time.h>
+#include "cryptonite_sha512.h"
+
+void cryptonite_sysrand_init(uint8_t *buf, uint32_t sz)
+{
+	struct timeval tv;
+	struct sha512_ctx ctx;
+	uint8_t out[64];
+	
+	gettimeofday(&tv, NULL);
+	cryptonite_sha512_init(&ctx);
+	cryptonite_sha512_update(&ctx, (uint8_t *) &tv, sizeof(tv));
+	cryptonite_sha512_finalize(&ctx, out);
+}
diff --git a/cryptonite.cabal b/cryptonite.cabal
index 8f0e72d..9dfb00b 100644
--- a/cryptonite.cabal
+++ b/cryptonite.cabal
@@ -190,6 +190,7 @@ Library
                    , cbits/cryptonite_tiger.c
                    , cbits/cryptonite_whirlpool.c
                    , cbits/cryptonite_scrypt.c
+                   , cbits/cryptonite_sysrand.c
   include-dirs:  cbits cbits/ed25519
 
   -- FIXME armel or mispel is also little endian.