diff --git a/sha1_io.c b/sha1_io.c
new file mode 100644
index 0000000..8cd2ca0
--- /dev/null
+++ b/sha1_io.c
@@ -0,0 +1,35 @@
+/* sha1_io.c - sha1 file I/O wrappers.
+ *
+ *   Copyright (C) 2011-2012  Henrik Hautakoski <henrik@fiktivkod.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *   MA 02110-1301, USA.
+ */
+
+#include <unistd.h>
+#include <arpa/inet.h>
+#include "sha1_io.h"
+
+int sha1_write(SHA_CTX *ctx, int fd, void *buf, size_t size) {
+
+	SHA1_Update(ctx, buf, size);
+	return write(fd, buf, size);
+}
+
+int sha1_write_int(SHA_CTX *ctx, int fd, int val) {
+
+	val = htonl(val);
+	return sha1_write(ctx, fd, &val, sizeof val);
+}
diff --git a/sha1_io.h b/sha1_io.h
new file mode 100644
index 0000000..7da05af
--- /dev/null
+++ b/sha1_io.h
@@ -0,0 +1,32 @@
+/* sha1_io.h - sha1 file I/O wrappers.
+ *
+ *   Copyright (C) 2011-2012  Henrik Hautakoski <henrik@fiktivkod.org>
+ *
+ *   This program is free software; you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program; if not, write to the Free Software
+ *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ *   MA 02110-1301, USA.
+ */
+#ifndef SHA1_IO_H
+#define SHA1_IO_H
+
+#include <openssl/sha.h>
+
+int sha1_write(SHA_CTX *ctx, int fd, void *buf, size_t size);
+
+/* This function makes sure that the integer is in
+   network byte order before it is written to disk
+   by 'sha1_write'. */
+int sha1_write_int(SHA_CTX *ctx, int fd, int val);
+
+#endif /* SHA1_IO_H */
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