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+// Copyright (c) 2014-2021, 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 "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;
+};