diff --git a/src/cryptonote_core/cryptonote_basic_impl.h b/src/cryptonote_core/cryptonote_basic_impl.h
new file mode 100644
index 0000000..cb6fb76
--- /dev/null
+++ b/src/cryptonote_core/cryptonote_basic_impl.h
@@ -0,0 +1,65 @@
+// 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 "cryptonote_basic.h"
+#include "crypto/crypto.h"
+#include "crypto/hash.h"
+
+
+namespace cryptonote {
+  /************************************************************************/
+  /*                                                                      */
+  /************************************************************************/
+  template<class t_array>
+  struct array_hasher: std::unary_function<t_array&, std::size_t>
+  {
+    std::size_t operator()(const t_array& val) const
+    {
+      return boost::hash_range(&val.data[0], &val.data[sizeof(val.data)]);
+    }
+  };
+
+
+#pragma pack(push, 1)
+  struct public_address_outer_blob
+  {
+    uint8_t m_ver;
+    account_public_address m_address;
+    uint8_t check_sum;
+  };
+#pragma pack (pop)
+
+
+  /************************************************************************/
+  /* Cryptonote helper functions                                          */
+  /************************************************************************/
+  size_t get_max_block_size();
+  size_t get_max_tx_size();
+  bool get_block_reward(size_t median_size, size_t current_block_size, uint64_t already_generated_coins, uint64_t &reward);
+  uint8_t get_account_address_checksum(const public_address_outer_blob& bl);
+  std::string get_account_address_as_str(const account_public_address& adr);
+  bool get_account_address_from_str(account_public_address& adr, const std::string& str);
+  bool is_coinbase(const transaction& tx);
+
+  bool operator ==(const cryptonote::transaction& a, const cryptonote::transaction& b);
+  bool operator ==(const cryptonote::block& a, const cryptonote::block& b);
+}
+
+template <class T>
+std::ostream &print256(std::ostream &o, const T &v) {
+  return o << "<" << epee::string_tools::pod_to_hex(v) << ">";
+}
+
+bool parse_hash256(const std::string str_hash, crypto::hash& hash);
+
+namespace crypto {
+  inline std::ostream &operator <<(std::ostream &o, const crypto::public_key &v) { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::secret_key &v) { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::key_derivation &v) { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::key_image &v) { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::signature &v) { return print256(o, v); }
+  inline std::ostream &operator <<(std::ostream &o, const crypto::hash &v) { return print256(o, v); }
+}