diff --git a/include/polarssl/pk.h b/include/polarssl/pk.h
new file mode 100644
index 0000000..d9639ee
--- /dev/null
+++ b/include/polarssl/pk.h
@@ -0,0 +1,47 @@
+/**
+ * \file pk.h
+ *
+ * \brief Public Key abstraction layer
+ *
+ *  Copyright (C) 2006-2013, Brainspark B.V.
+ *
+ *  This file is part of PolarSSL (http://www.polarssl.org)
+ *  Lead Maintainer: Paul Bakker <polarssl_maintainer at polarssl.org>
+ *
+ *  All rights reserved.
+ *
+ *  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 POLARSSL_PK_H
+#define POLARSSL_PK_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/**
+ * \brief          Public key types
+ */
+typedef enum {
+    POLARSSL_PK_NONE=0,
+    POLARSSL_PK_RSA,
+    POLARSSL_PK_ECDSA,
+} pk_type_t;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* pk.h */