out_can_be_to_acc.h

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// Copyright (c) 2014-2022, The Monero Project
//
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// 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.
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// 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.
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// 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.
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// 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
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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;
};