out_can_be_to_acc.h

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// Copyright (c) 2014-2022, The Monero Project
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//    of conditions and the following disclaimer in the documentation and/or other
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// Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers

#pragma once

#include "crypto/crypto.h"
#include "cryptonote_basic/cryptonote_basic.h"

#include "single_tx_test_base.h"

using namespace crypto;

// use_view_tags: whether to enable view tag checking
// is_owned: whether the output is owned by us
template<bool use_view_tags, bool is_owned>
class test_out_can_be_to_acc : public single_tx_test_base
{
  public:
    static const size_t loop_count = 1000;

    bool init()
    {
      if (!single_tx_test_base::init())
        return false;

      crypto::key_derivation key_derivation;
      crypto::view_tag vt;

      m_output_index = 0;
      m_view_secret_key = m_bob.get_keys().m_view_secret_key;
      m_spend_public_key = m_bob.get_keys().m_account_address.m_spend_public_key;

      cryptonote::get_output_public_key(m_tx.vout[m_output_index], m_output_public_key);

      if (use_view_tags)
      {
        crypto::generate_key_derivation(m_tx_pub_key, m_view_secret_key, key_derivation);
        crypto::derive_view_tag(key_derivation, m_output_index, vt);
        m_view_tag_opt = vt;
      }
      else
        m_view_tag_opt = boost::optional<crypto::view_tag>();

      return true;
    }

    bool test()
    {
      // include key derivation to demonstrate performance improvement when using view tags
      crypto::key_derivation key_derivation;
      crypto::generate_key_derivation(m_tx_pub_key, m_view_secret_key, key_derivation);

      // if using view tags, this ensures we computed the view tag properly
      if (!cryptonote::out_can_be_to_acc(m_view_tag_opt, key_derivation, m_output_index))
        return false;

      // if user owns output, this tests the output public key matches the derived
      if (is_owned)
      {
        crypto::public_key output_public_key;
        crypto::derive_public_key(key_derivation, m_output_index, m_spend_public_key, output_public_key);

        if (m_output_public_key != output_public_key)
          return false;
      }

      return true;
    }

    private:
      size_t m_output_index;
      crypto::secret_key m_view_secret_key;
      crypto::public_key m_spend_public_key;
      crypto::public_key m_output_public_key;
      boost::optional<crypto::view_tag> m_view_tag_opt;
};