break out cipher primitives, add unit tests

git-svn-id: http://encfs.googlecode.com/svn/trunk@94 db9cf616-1c43-0410-9cb8-a902689de0d6

cipher/testing.h

@@ -0,0 +1,36 @@
+
+/*****************************************************************************
+ * Author:   Valient Gough <vgough@pobox.com>
+ *
+ *****************************************************************************
+ * Copyright (c) 2013 Valient Gough
+ *
+ * This program is free software: you can redistribute it and/or modify it under
+ * the terms of the GNU Lesser General Public License as published by the Free
+ * Software Foundation, either version 3 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 Lesser General Public License for more
+ * details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef _CIPHER_TESTING_incl_
+#define _CIPHER_TESTING_incl_
+
+#include <string>
+
+#include "base/types.h"
+
+namespace encfs {
+
+std::string stringToHex(const byte *data, int len);
+
+}  // namespace encfs
+
+#endif
+