Added SAL support

src/cryptonote_basic/difficulty.h

@@ -0,0 +1,19 @@
+// Copyright (c) 2012-2013 The Cryptonote developers
+// Distributed under the MIT/X11 software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#pragma once
+
+#include <cstdint>
+#include <vector>
+
+#include "crypto/hash.h"
+
+namespace cryptonote
+{
+    typedef std::uint64_t difficulty_type;
+
+    bool check_hash(const crypto::hash &hash, difficulty_type difficulty);
+    difficulty_type next_difficulty(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties);
+    difficulty_type next_difficulty(std::vector<std::uint64_t> timestamps, std::vector<difficulty_type> cumulative_difficulties, size_t target_seconds);
+}