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salvium/tests/unit_tests/carrot_sparc.cpp
Some Random Crypto Guy 0520fc4fe6 working make_return_tx() code
2025-05-14 12:04:50 +01:00

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17 KiB
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// Copyright (c) 2024, The Monero Project
// Portions Copyright (c) 2024, Salvium (author: SRCG)
//
// 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.
#include "gtest/gtest.h"
#include "carrot_core/account_secrets.h"
#include "carrot_core/address_utils.h"
#include "carrot_core/device_ram_borrowed.h"
#include "carrot_core/enote_utils.h"
#include "carrot_core/output_set_finalization.h"
#include "carrot_core/payment_proposal.h"
#include "carrot_core/scan.h"
#include "carrot_core/sparc.h"
#include "crypto/crypto.h"
#include "crypto/generators.h"
#include "ringct/rctOps.h"
#include "carrot_mock_helpers.h"
using namespace carrot;
//----------------------------------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------------------------------------
struct mock_carrot_keys
{
crypto::secret_key s_master;
crypto::secret_key k_prove_spend;
crypto::secret_key s_view_balance;
crypto::secret_key k_generate_image;
crypto::secret_key k_view;
crypto::secret_key s_generate_address;
crypto::public_key account_spend_pubkey;
crypto::public_key account_view_pubkey;
crypto::public_key main_address_view_pubkey;
view_incoming_key_ram_borrowed_device k_view_dev;
view_balance_secret_ram_borrowed_device s_view_balance_dev;
mock_carrot_keys(): k_view_dev(k_view), s_view_balance_dev(s_view_balance)
{}
static mock_carrot_keys generate()
{
mock_carrot_keys k;
crypto::generate_random_bytes_thread_safe(sizeof(crypto::secret_key), to_bytes(k.s_master));
make_carrot_provespend_key(k.s_master, k.k_prove_spend);
make_carrot_viewbalance_secret(k.s_master, k.s_view_balance);
make_carrot_generateimage_key(k.s_view_balance, k.k_generate_image);
make_carrot_viewincoming_key(k.s_view_balance, k.k_view);
make_carrot_generateaddress_secret(k.s_view_balance, k.s_generate_address);
make_carrot_spend_pubkey(k.k_generate_image, k.k_prove_spend, k.account_spend_pubkey);
k.account_view_pubkey = rct::rct2pk(rct::scalarmultKey(rct::pk2rct(k.account_spend_pubkey),
rct::sk2rct(k.k_view)));
k.main_address_view_pubkey = rct::rct2pk(rct::scalarmultBase(rct::sk2rct(k.k_view)));
return k;
}
};
//----------------------------------------------------------------------------------------------------------------------
//----------------------------------------------------------------------------------------------------------------------
static bool can_open_fcmp_onetime_address(const crypto::secret_key &k_prove_spend,
const crypto::secret_key &k_generate_image,
const crypto::secret_key &subaddr_scalar,
const crypto::secret_key &sender_extension_g,
const crypto::secret_key &sender_extension_t,
const crypto::public_key &onetime_address)
{
// K_s = k_gi G + k_ps T
// K^j_s = k^j_subscal * K_s
// Ko = K^j_s + k^o_g G + k^o_t T
// = (k^o_g + k^j_subscal * k_gi) G + (k^o_t + k^j_subscal * k_ps) T
// combined_g = k^o_g + k^j_subscal * k_gi
rct::key combined_g;
sc_muladd(combined_g.bytes, to_bytes(subaddr_scalar), to_bytes(k_generate_image), to_bytes(sender_extension_g));
// combined_t = k^o_t + k^j_subscal * k_ps
rct::key combined_t;
sc_muladd(combined_t.bytes, to_bytes(subaddr_scalar), to_bytes(k_prove_spend), to_bytes(sender_extension_t));
// Ko' = combined_g G + combined_t T
rct::key recomputed_onetime_address;
rct::addKeys2(recomputed_onetime_address, combined_g, combined_t, rct::pk2rct(crypto::get_T()));
// Ko' ?= Ko
return recomputed_onetime_address == onetime_address;
}
//----------------------------------------------------------------------------------------------------------------------
template <typename T>
static auto auto_wiper(T &obj)
{
static_assert(std::is_trivially_copyable<T>());
return epee::misc_utils::create_scope_leave_handler([&]{ memwipe(&obj, sizeof(T)); });
}
//----------------------------------------------------------------------------------------------------------------------
std::tuple<std::vector<RCTOutputEnoteProposal>, crypto::public_key> make_origin_tx(
mock::mock_carrot_and_legacy_keys &alice,
CarrotDestinationV1 &bob_address
) {
// spend input
const crypto::key_image tx_first_key_image = rct::rct2ki(rct::pkGen());
// make change output
RCTOutputEnoteProposal enote_proposal_change;
get_output_proposal_internal_v1(
CarrotPaymentProposalSelfSendV1{
.destination_address_spend_pubkey = alice.carrot_account_spend_pubkey,
.amount = crypto::rand<rct::xmr_amount>(),
.enote_type = CarrotEnoteType::CHANGE,
.enote_ephemeral_pubkey = gen_x25519_pubkey(),
},
alice.s_view_balance_dev,
tx_first_key_image,
std::nullopt,
enote_proposal_change
);
// make payment output
RCTOutputEnoteProposal enote_proposal_out;
encrypted_payment_id_t encrypted_payment_id_out;
const auto randomness = gen_janus_anchor();
get_output_proposal_normal_v1(
CarrotPaymentProposalV1{
.destination = bob_address,
.amount = crypto::rand<rct::xmr_amount>(),
.randomness = randomness
},
tx_first_key_image,
enote_proposal_out,
encrypted_payment_id_out
);
// compute tx private key
const input_context_t input_context = make_carrot_input_context(enote_proposal_out.enote.tx_first_key_image);
crypto::secret_key enote_ephemeral_privkey;
make_carrot_enote_ephemeral_privkey(
randomness,
input_context,
bob_address.address_spend_pubkey,
bob_address.payment_id,
enote_ephemeral_privkey
);
// compute k_return
crypto::secret_key k_return;
alice.s_view_balance_dev.make_internal_return_privkey(input_context, enote_proposal_out.enote.onetime_address, k_return);
// compute K_return = k_return * G
crypto::public_key return_pub;
crypto::secret_key_to_public_key(k_return, return_pub);
encrypted_return_pubkey_t K_return;
static_assert(sizeof(K_return.bytes) == sizeof(return_pub.data), "Size mismatch");
memcpy(K_return.bytes, return_pub.data, sizeof(encrypted_return_pubkey_t));
// compute K_o = K_change + K_return
crypto::public_key K_o;
sc_add(to_bytes(K_o), to_bytes(enote_proposal_change.enote.onetime_address), K_return.bytes);
// calculate the shared secret
mx25519_pubkey shared_secret_unctx;
auto dhe_wiper = auto_wiper(shared_secret_unctx);
make_carrot_uncontextualized_shared_key_sender(
enote_ephemeral_privkey,
bob_address.address_view_pubkey,
shared_secret_unctx
);
// compute m_return
encrypted_return_pubkey_t m_return;
make_sparc_return_pubkey_encryption_mask(shared_secret_unctx.data, input_context, enote_proposal_out.enote.onetime_address, m_return);
// compute return_enc
enote_proposal_out.enote.return_enc = K_return ^ m_return;
// Return the enotes and the public return key
std::vector<RCTOutputEnoteProposal> tx_enotes{enote_proposal_change, enote_proposal_out};
return {tx_enotes, K_o};
}
//----------------------------------------------------------------------------------------------------------------------
std::tuple<std::vector<RCTOutputEnoteProposal>, crypto::public_key> make_return_tx(
mock::mock_carrot_and_legacy_keys &bob,
std::vector<RCTOutputEnoteProposal> &origin_tx_outputs
) {
// [0] enote is change, [1] enote bob received
const auto change_output = origin_tx_outputs[0].enote;
const auto received_output = origin_tx_outputs[1].enote;
// 1. Recover the shared secret s_sr^ctx
const input_context_t input_context = make_carrot_input_context(received_output.tx_first_key_image);
mx25519_pubkey origin_tx_shared_secret_unctx;
crypto::hash origin_tx_shared_secret;
EXPECT_TRUE(bob.k_view_incoming_dev.view_key_scalar_mult_x25519(received_output.enote_ephemeral_pubkey, origin_tx_shared_secret_unctx));
make_carrot_sender_receiver_secret(
origin_tx_shared_secret_unctx.data,
received_output.enote_ephemeral_pubkey,
input_context,
origin_tx_shared_secret
);
// 2. scan the output to see if it belongs to Bob
crypto::secret_key recovered_sender_extension_g;
crypto::secret_key recovered_sender_extension_t;
crypto::public_key recovered_address_spend_pubkey;
rct::xmr_amount recovered_amount;
crypto::secret_key recovered_amount_blinding_factor;
encrypted_payment_id_t recovered_payment_id;
CarrotEnoteType recovered_enote_type;
const bool scan_success = try_scan_carrot_enote_external_receiver(
received_output,
std::nullopt,
origin_tx_shared_secret_unctx,
{&bob.carrot_account_spend_pubkey, 1},
bob.k_view_incoming_dev,
recovered_sender_extension_g,
recovered_sender_extension_t,
recovered_address_spend_pubkey,
recovered_amount,
recovered_amount_blinding_factor,
recovered_payment_id,
recovered_enote_type
);
EXPECT_TRUE(scan_success);
// check we can spend it
EXPECT_TRUE(can_open_fcmp_onetime_address(
bob.k_prove_spend,
bob.k_generate_image,
rct::rct2sk(rct::I),
recovered_sender_extension_g,
recovered_sender_extension_t,
received_output.onetime_address
));
// spend the received output for a return tx
const crypto::key_image tx_return_first_key_image = bob.derive_key_image(
bob.cryptonote_address().address_spend_pubkey,
recovered_sender_extension_g,
recovered_sender_extension_t,
received_output.onetime_address
);
// Create a TX fee that needs to be deducted from the returned amount
const rct::xmr_amount txnFee = recovered_amount >> 4;
const rct::xmr_amount amount_return = recovered_amount - txnFee;
// compute m_return
encrypted_return_pubkey_t m_return;
make_sparc_return_pubkey_encryption_mask(origin_tx_shared_secret_unctx.data, input_context, received_output.onetime_address, m_return);
// compute K_return from return_enc
encrypted_return_pubkey_t K_return;
K_return = received_output.return_enc ^ m_return;
crypto::public_key return_pub;
static_assert(sizeof(K_return.bytes) == sizeof(return_pub.data), "Size mismatch");
memcpy(return_pub.data, K_return.bytes, sizeof(encrypted_return_pubkey_t));
// Make a destination address for the return
CarrotDestinationV1 return_destination;
make_carrot_main_address_v1(change_output.onetime_address, return_pub, return_destination);
// Create the return proposal, using the return address and the amount
const CarrotPaymentProposalV1 proposal_return = CarrotPaymentProposalV1{
.destination = return_destination,
.amount = amount_return,
.randomness = gen_janus_anchor()
};
RCTOutputEnoteProposal enote_proposal_return;
encrypted_payment_id_t encrypted_payment_id_return;
get_output_proposal_return_v1(
proposal_return,
tx_return_first_key_image,
enote_proposal_return,
encrypted_payment_id_return
);
std::vector<RCTOutputEnoteProposal> tx_enotes{enote_proposal_return};
return {tx_enotes, enote_proposal_return.enote.onetime_address};
}
//----------------------------------------------------------------------------------------------------------------------
TEST(carrot_sparc, main_address_return_payment_normal_scan_completeness)
{
// these will generate a new format carrot address.
mock::mock_carrot_and_legacy_keys alice, bob;
alice.generate();
bob.generate();
// make origin tx Alice -> Bob
CarrotDestinationV1 bob_address = bob.cryptonote_address();
auto [origin_tx_outputs, origin_return_pubkey] = make_origin_tx(alice, bob_address);
// make return tx Bob -> Alice
auto [return_tx_outputs, return_pubkey] = make_return_tx(bob, origin_tx_outputs);
const auto return_output = return_tx_outputs[0].enote;
// Alice checks the "hashmap" for a known return_address
ASSERT_EQ(origin_return_pubkey, return_pubkey);
// 1. Alice Recover the shared secret(s_sr^ctx) of return tx
const input_context_t input_context_return = make_carrot_input_context(return_output.tx_first_key_image);
mx25519_pubkey shared_secret_return_unctx;
crypto::hash shared_secret_return;
EXPECT_TRUE(bob.k_view_incoming_dev.view_key_scalar_mult_x25519(return_output.enote_ephemeral_pubkey, shared_secret_return_unctx));
make_carrot_sender_receiver_secret(
shared_secret_return_unctx.data,
return_output.enote_ephemeral_pubkey,
input_context_return,
shared_secret_return
);
/*
// 2. scan the enote to see if it belongs to Alice
crypto::secret_key recovered_sender_extension_g_return;
crypto::secret_key recovered_sender_extension_t_return;
crypto::public_key recovered_address_spend_pubkey_return;
rct::xmr_amount recovered_amount_return;
crypto::secret_key recovered_amount_blinding_factor_return;
CarrotEnoteType recovered_enote_type_return;
payment_id_t recovered_payment_id_return;
const bool scan_success_return = try_scan_carrot_enote_external(
return_output,
std::nullopt,
shared_secret_return_unctx,
alice.k_view_incoming_dev,
alice.carrot_account_spend_pubkey,
recovered_sender_extension_g_return,
recovered_sender_extension_t_return,
recovered_address_spend_pubkey_return,
recovered_amount_return,
recovered_amount_blinding_factor_return,
recovered_payment_id_return,
recovered_enote_type_return
);
ASSERT_TRUE(scan_success_return);
*/
// check recovered data
// EXPECT_EQ(enote_proposal_change.enote.onetime_address, recovered_address_spend_pubkey_return);
// EXPECT_EQ(proposal_out.amount, recovered_amount_return + txnFee); // returned minus the deducted TX fee
// EXPECT_EQ(enote_proposal_return.amount_blinding_factor, recovered_amount_blinding_factor_return);
// EXPECT_EQ(null_payment_id, recovered_payment_id_return);
// EXPECT_EQ(CarrotEnoteType::PAYMENT, recovered_enote_type_return);
// check spendability of the return_payment
// rct::key combined_extension_g;
// sc_add(combined_extension_g.bytes, to_bytes(recovered_sender_extension_g_change), to_bytes(recovered_sender_extension_g_return));
// rct::key combined_extension_t;
// sc_add(combined_extension_t.bytes, to_bytes(recovered_sender_extension_t_change), to_bytes(recovered_sender_extension_t_return));
// EXPECT_TRUE(can_open_fcmp_onetime_address(alice.k_prove_spend,
// alice.k_generate_image,
// rct::rct2sk(rct::I),
// rct::rct2sk(combined_extension_g),
// rct::rct2sk(combined_extension_t),
// enote_proposal_return.enote.onetime_address));
}
//----------------------------------------------------------------------------------------------------------------------
TEST(carrot_sparc, get_spend_authority_proof_completeness)
{
// Create a structure to hold the proof
rct::zk_proof proof;
// Create a dummy K_o value from random scalars
rct::key x = rct::skGen();
rct::key y = rct::skGen();
rct::key xG = rct::scalarmultBase(x);
rct::key yT = rct::scalarmultKey(rct::pk2rct(crypto::get_T()), y);
rct::key K_o = rct::addKeys(xG, yT);
// Generate the proof
carrot::make_sparc_spend_authority_proof(x, y, K_o, proof);
// Verify the proof
EXPECT_TRUE(carrot::verify_sparc_spend_authority_proof(proof, K_o));
}