text: // Copyright (c) 2014-2019, The Monero Project
  // 
  // All rights reserved.
  // 
  // Redistribution and use in source and binary forms, with or without modification, are
  // permitted provided that the following conditions are met:
  // 
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  // 
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  // 
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  // 
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  // 
  // Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
  
  #pragma once
  #include "blobdatatype.h"
  #include "cryptonote_basic_impl.h"
  #include "tx_extra.h"
  #include "account.h"
  #include "subaddress_index.h"
  #include "include_base_utils.h"
  #include "crypto/crypto.h"
  #include "crypto/hash.h"
  #include <unordered_map>
  #include <boost/multiprecision/cpp_int.hpp>
  
  namespace epee
  {
    class wipeable_string;
  }
  
  namespace cryptonote
  {
    //---------------------------------------------------------------
    void get_transaction_prefix_hash(const transaction_prefix& tx, crypto::hash& h, hw::device &hwdev);
    crypto::hash get_transaction_prefix_hash(const transaction_prefix& tx, hw::device &hwdev);
    void get_transaction_prefix_hash(const transaction_prefix& tx, crypto::hash& h);
    crypto::hash get_transaction_prefix_hash(const transaction_prefix& tx);
    bool parse_and_validate_tx_prefix_from_blob(const blobdata& tx_blob, transaction_prefix& tx);
    bool parse_and_validate_tx_from_blob(const blobdata& tx_blob, transaction& tx, crypto::hash& tx_hash, crypto::hash& tx_prefix_hash);
    bool parse_and_validate_tx_from_blob(const blobdata& tx_blob, transaction& tx, crypto::hash& tx_hash);
    bool parse_and_validate_tx_from_blob(const blobdata& tx_blob, transaction& tx);
    bool parse_and_validate_tx_base_from_blob(const blobdata& tx_blob, transaction& tx);
    bool is_v1_tx(const blobdata_ref& tx_blob);
    bool is_v1_tx(const blobdata& tx_blob);
  
    template<typename T>
    bool find_tx_extra_field_by_type(const std::vector<tx_extra_field>& tx_extra_fields, T& field, size_t index = 0)
    {
      auto it = std::find_if(tx_extra_fields.begin(), tx_extra_fields.end(), [&index](const tx_extra_field& f) { return typeid(T) == f.type() && !index--; });
      if(tx_extra_fields.end() == it)
        return false;
  
      field = boost::get<T>(*it);
      return true;
    }
  
    bool parse_tx_extra(const std::vector<uint8_t>& tx_extra, std::vector<tx_extra_field>& tx_extra_fields);
    bool sort_tx_extra(const std::vector<uint8_t>& tx_extra, std::vector<uint8_t> &sorted_tx_extra, bool allow_partial = false);
    crypto::public_key get_tx_pub_key_from_extra(const std::vector<uint8_t>& tx_extra, size_t pk_index = 0);
    crypto::public_key get_tx_pub_key_from_extra(const transaction_prefix& tx, size_t pk_index = 0);
    crypto::public_key get_tx_pub_key_from_extra(const transaction& tx, size_t pk_index = 0);
    bool add_tx_pub_key_to_extra(transaction& tx, const crypto::public_key& tx_pub_key);
    bool add_tx_pub_key_to_extra(transaction_prefix& tx, const crypto::public_key& tx_pub_key);
    bool add_tx_pub_key_to_extra(std::vector<uint8_t>& tx_extra, const crypto::public_key& tx_pub_key);
    std::vector<crypto::public_key> get_additional_tx_pub_keys_from_extra(const std::vector<uint8_t>& tx_extra);
    std::vector<crypto::public_key> get_additional_tx_pub_keys_from_extra(const transaction_prefix& tx);
    bool add_additional_tx_pub_keys_to_extra(std::vector<uint8_t>& tx_extra, const std::vector<crypto::public_key>& additional_pub_keys);
    bool add_extra_nonce_to_tx_extra(std::vector<uint8_t>& tx_extra, const blobdata& extra_nonce);
    bool remove_field_from_tx_extra(std::vector<uint8_t>& tx_extra, const std::type_info &type);
    void set_payment_id_to_tx_extra_nonce(blobdata& extra_nonce, const crypto::hash& payment_id);
    void set_encrypted_payment_id_to_tx_extra_nonce(blobdata& extra_nonce, const crypto::hash8& payment_id);
    bool get_payment_id_from_tx_extra_nonce(const blobdata& extra_nonce, crypto::hash& payment_id);
    bool get_encrypted_payment_id_from_tx_extra_nonce(const blobdata& extra_nonce, crypto::hash8& payment_id);
    bool is_out_to_acc(const account_keys& acc, const txout_to_key& out_key, const crypto::public_key& tx_pub_key, const std::vector<crypto::public_key>& additional_tx_public_keys, size_t output_index);
    struct subaddress_receive_info
    {
      subaddress_index index;
      crypto::key_derivation derivation;
    };
    boost::optional<subaddress_receive_info> is_out_to_acc_precomp(const std::unordered_map<crypto::public_key, subaddress_index>& subaddresses, const crypto::public_key& out_key, const crypto::key_derivation& derivation, const std::vector<crypto::key_derivation>& additional_derivations, size_t output_index, hw::device &hwdev);
    bool lookup_acc_outs(const account_keys& acc, const transaction& tx, const crypto::public_key& tx_pub_key, const std::vector<crypto::public_key>& additional_tx_public_keys, std::vector<size_t>& outs, uint64_t& money_transfered);
    bool lookup_acc_outs(const account_keys& acc, const transaction& tx, std::vector<size_t>& outs, uint64_t& money_transfered);
    bool get_tx_fee(const transaction& tx, uint64_t & fee);
    uint64_t get_tx_fee(const transaction& tx);
    bool generate_key_image_helper(const account_keys& ack, const std::unordered_map<crypto::public_key, subaddress_index>& subaddresses, const crypto::public_key& out_key, const crypto::public_key& tx_public_key, const std::vector<crypto::public_key>& additional_tx_public_keys, size_t real_output_index, keypair& in_ephemeral, crypto::key_image& ki, hw::device &hwdev);
    bool generate_key_image_helper_precomp(const account_keys& ack, const crypto::public_key& out_key, const crypto::key_derivation& recv_derivation, size_t real_output_index, const subaddress_index& received_index, keypair& in_ephemeral, crypto::key_image& ki, hw::device &hwdev);
    void get_blob_hash(const blobdata& blob, crypto::hash& res);
    void get_blob_hash(const epee::span<const char>& blob, crypto::hash& res);
    crypto::hash get_blob_hash(const blobdata& blob);
    crypto::hash get_blob_hash(const epee::span<const char>& blob);
    std::string short_hash_str(const crypto::hash& h);
  
    crypto::hash get_transaction_hash(const transaction& t);
    bool get_transaction_hash(const transaction& t, crypto::hash& res);
    bool get_transaction_hash(const transaction& t, crypto::hash& res, size_t& blob_size);
    bool get_transaction_hash(const transaction& t, crypto::hash& res, size_t* blob_size);
    bool calculate_transaction_prunable_hash(const transaction& t, const cryptonote::blobdata *blob, crypto::hash& res);
    crypto::hash get_transaction_prunable_hash(const transaction& t, const cryptonote::blobdata *blob = NULL);
    bool calculate_transaction_hash(const transaction& t, crypto::hash& res, size_t* blob_size);
    crypto::hash get_pruned_transaction_hash(const transaction& t, const crypto::hash &pruned_data_hash);
  
    blobdata get_block_hashing_blob(const block& b);
    bool calculate_block_hash(const block& b, crypto::hash& res, const blobdata *blob = NULL);
    bool get_block_hash(const block& b, crypto::hash& res);
    crypto::hash get_block_hash(const block& b);
    bool parse_and_validate_block_from_blob(const blobdata& b_blob, block& b, crypto::hash *block_hash);
    bool parse_and_validate_block_from_blob(const blobdata& b_blob, block& b);
    bool parse_and_validate_block_from_blob(const blobdata& b_blob, block& b, crypto::hash &block_hash);
    bool get_inputs_money_amount(const transaction& tx, uint64_t& money);
    uint64_t get_outs_money_amount(const transaction& tx);
    bool check_inputs_types_supported(const transaction& tx);
    bool check_outs_valid(const transaction& tx);
    bool parse_amount(uint64_t& amount, const std::string& str_amount);
    uint64_t get_transaction_weight(const transaction &tx);
    uint64_t get_transaction_weight(const transaction &tx, size_t blob_size);
    uint64_t get_pruned_transaction_weight(const transaction &tx);
  
    bool check_money_overflow(const transaction& tx);
    bool check_outs_overflow(const transaction& tx);
    bool check_inputs_overflow(const transaction& tx);
    uint64_t get_block_height(const block& b);
    std::vector<uint64_t> relative_output_offsets_to_absolute(const std::vector<uint64_t>& off);
    std::vector<uint64_t> absolute_output_offsets_to_relative(const std::vector<uint64_t>& off);
    void set_default_decimal_point(unsigned int decimal_point = CRYPTONOTE_DISPLAY_DECIMAL_POINT);
    unsigned int get_default_decimal_point();
    std::string get_unit(unsigned int decimal_point = -1);
    std::string print_money(uint64_t amount, unsigned int decimal_point = -1);
    std::string print_money(const boost::multiprecision::uint128_t &amount, unsigned int decimal_point = -1);
    //---------------------------------------------------------------
    template<class t_object>
    bool t_serializable_object_from_blob(t_object& to, const blobdata& b_blob)
    {
      std::stringstream ss;
      ss << b_blob;
      binary_archive<false> ba(ss);
      bool r = ::serialization::serialize(ba, to);
      return r;
    }
    //---------------------------------------------------------------
    template<class t_object>
    bool t_serializable_object_to_blob(const t_object& to, blobdata& b_blob)
    {
      std::stringstream ss;
      binary_archive<true> ba(ss);
      bool r = ::serialization::serialize(ba, const_cast<t_object&>(to));
      b_blob = ss.str();
      return r;
    }
    //---------------------------------------------------------------
    template<class t_object>
    blobdata t_serializable_object_to_blob(const t_object& to)
    {
      blobdata b;
      t_serializable_object_to_blob(to, b);
      return b;
    }
    //---------------------------------------------------------------
    template<class t_object>
    bool get_object_hash(const t_object& o, crypto::hash& res)
    {
      get_blob_hash(t_serializable_object_to_blob(o), res);
      return true;
    }
    //---------------------------------------------------------------
    template<class t_object>
    size_t get_object_blobsize(const t_object& o)
    {
      blobdata b = t_serializable_object_to_blob(o);
      return b.size();
    }
    //---------------------------------------------------------------
    template<class t_object>
    bool get_object_hash(const t_object& o, crypto::hash& res, size_t& blob_size)
    {
      blobdata bl = t_serializable_object_to_blob(o);
      blob_size = bl.size();
      get_blob_hash(bl, res);
      return true;
    }
    //---------------------------------------------------------------
    template <typename T>
    std::string obj_to_json_str(T& obj)
    {
      std::stringstream ss;
      json_archive<true> ar(ss, true);
      bool r = ::serialization::serialize(ar, obj);
      CHECK_AND_ASSERT_MES(r, "", "obj_to_json_str failed: serialization::serialize returned false");
      return ss.str();
    }
    //---------------------------------------------------------------
    // 62387455827 -> 455827 + 7000000 + 80000000 + 300000000 + 2000000000 + 60000000000, where 455827 <= dust_threshold
    template<typename chunk_handler_t, typename dust_handler_t>
    void decompose_amount_into_digits(uint64_t amount, uint64_t dust_threshold, const chunk_handler_t& chunk_handler, const dust_handler_t& dust_handler)
    {
      if (0 == amount)
      {
        return;
      }
  
      bool is_dust_handled = false;
      uint64_t dust = 0;
      uint64_t order = 1;
      while (0 != amount)
      {
        uint64_t chunk = (amount % 10) * order;
        amount /= 10;
        order *= 10;
  
        if (dust + chunk <= dust_threshold)
        {
          dust += chunk;
        }
        else
        {
          if (!is_dust_handled && 0 != dust)
          {
            dust_handler(dust);
            is_dust_handled = true;
          }
          if (0 != chunk)
          {
            chunk_handler(chunk);
          }
        }
      }
  
      if (!is_dust_handled && 0 != dust)
      {
        dust_handler(dust);
      }
    }
    //---------------------------------------------------------------
    blobdata block_to_blob(const block& b);
    bool block_to_blob(const block& b, blobdata& b_blob);
    blobdata tx_to_blob(const transaction& b);
    bool tx_to_blob(const transaction& b, blobdata& b_blob);
    void get_tx_tree_hash(const std::vector<crypto::hash>& tx_hashes, crypto::hash& h);
    crypto::hash get_tx_tree_hash(const std::vector<crypto::hash>& tx_hashes);
    crypto::hash get_tx_tree_hash(const block& b);
    bool is_valid_decomposed_amount(uint64_t amount);
    void get_hash_stats(uint64_t &tx_hashes_calculated, uint64_t &tx_hashes_cached, uint64_t &block_hashes_calculated, uint64_t & block_hashes_cached);
  
    crypto::secret_key encrypt_key(crypto::secret_key key, const epee::wipeable_string &passphrase);
    crypto::secret_key decrypt_key(crypto::secret_key key, const epee::wipeable_string &passphrase);
  #define CHECKED_GET_SPECIFIC_VARIANT(variant_var, specific_type, variable_name, fail_return_val) \
    CHECK_AND_ASSERT_MES(variant_var.type() == typeid(specific_type), fail_return_val, "wrong variant type: " << variant_var.type().name() << ", expected " << typeid(specific_type).name()); \
    specific_type& variable_name = boost::get<specific_type>(variant_var);
  }
  