Add skeleton ecdsa.[ch]

library/CMakeLists.txt

diff --git a/library/CMakeLists.txt b/library/CMakeLists.txt
index 28bbedc..6bc46e0 100644
--- a/library/CMakeLists.txt
+++ b/library/CMakeLists.txt
@@ -18,6 +18,7 @@
      dhm.c
      ecp.c
      ecdh.c
+     ecdsa.c
      entropy.c
      entropy_poll.c
      error.c

library/ecdh.c

diff --git a/library/ecdh.c b/library/ecdh.c
index 1515899..1b4fcd3 100644
--- a/library/ecdh.c
+++ b/library/ecdh.c
@@ -31,7 +31,7 @@
 
 #include "polarssl/config.h"
 
-#if defined(POLARSSL_ECP_C)
+#if defined(POLARSSL_ECDH_C)
 
 #include "polarssl/ecdh.h"
 
@@ -87,4 +87,4 @@
 
 #endif
 
-#endif /* defined(POLARSSL_ECP_C) */
+#endif /* defined(POLARSSL_ECDH_C) */

library/ecdsa.c

diff --git a/library/ecdsa.c b/library/ecdsa.c
new file mode 100644
index 0000000..09d14f9
--- /dev/null
+++ b/library/ecdsa.c
@@ -0,0 +1,51 @@
+/*
+ *  Elliptic curve DSA
+ *
+ *  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.
+ */
+
+/*
+ * References:
+ *
+ * SEC1 http://www.secg.org/index.php?action=secg,docs_secg
+ */
+
+#include "polarssl/config.h"
+
+#if defined(POLARSSL_ECDSA_C)
+
+#include "polarssl/ecdsa.h"
+
+
+#if defined(POLARSSL_SELF_TEST)
+
+/*
+ * Checkup routine
+ */
+int ecdsa_self_test( int verbose )
+{
+    return( verbose++ );
+}
+
+#endif
+
+#endif /* defined(POLARSSL_ECDSA_C) */