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wownero/src/device_trezor/trezor/protocol.cpp

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// Copyright (c) 2017-2019, 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.
//
#include "version.h"
#include "protocol.hpp"
#include <unordered_map>
#include <set>
#include <utility>
#include <boost/endian/conversion.hpp>
#include <common/apply_permutation.h>
#include <common/json_util.h>
#include <crypto/hmac-keccak.h>
#include <ringct/rctSigs.h>
#include <ringct/bulletproofs.h>
#include "cryptonote_config.h"
#include <sodium.h>
#include <sodium/crypto_verify_32.h>
#include <sodium/crypto_aead_chacha20poly1305.h>
#define GET_FIELD_STRING(name, type, jtype) field_##name = std::string(json[#name].GetString(), json[#name].GetStringLength())
#define GET_FIELD_OTHER(name, type, jtype) field_##name = static_cast<type>(json[#name].Get##jtype())
#define GET_STRING_FROM_JSON(json, name, type, mandatory, def) \
GET_FIELD_FROM_JSON_EX(json, name, type, String, mandatory, def, GET_FIELD_STRING)
#define GET_FIELD_FROM_JSON(json, name, type, jtype, mandatory, def) \
GET_FIELD_FROM_JSON_EX(json, name, type, jtype, mandatory, def, GET_FIELD_OTHER)
#define GET_FIELD_FROM_JSON_EX(json, name, type, jtype, mandatory, def, VAL) \
type field_##name = static_cast<type>(def); \
bool field_##name##_found = false; \
(void)field_##name##_found; \
do if (json.HasMember(#name)) \
{ \
if (json[#name].Is##jtype()) \
{ \
VAL(name, type, jtype); \
field_##name##_found = true; \
} \
else \
{ \
throw std::invalid_argument("Field " #name " found in JSON, but not " #jtype); \
} \
} \
else if (mandatory) \
{ \
throw std::invalid_argument("Field " #name " not found in JSON");\
} while(0)
namespace hw{
namespace trezor{
namespace protocol{
std::string key_to_string(const ::crypto::ec_point & key){
return std::string(key.data, sizeof(key.data));
}
std::string key_to_string(const ::crypto::ec_scalar & key){
return std::string(key.data, sizeof(key.data));
}
std::string key_to_string(const ::crypto::hash & key){
return std::string(key.data, sizeof(key.data));
}
std::string key_to_string(const ::rct::key & key){
return std::string(reinterpret_cast<const char*>(key.bytes), sizeof(key.bytes));
}
void string_to_key(::crypto::ec_scalar & key, const std::string & str){
if (str.size() != sizeof(key.data)){
throw std::invalid_argument(std::string("Key has to have ") + std::to_string(sizeof(key.data)) + " B");
}
memcpy(key.data, str.data(), sizeof(key.data));
}
void string_to_key(::crypto::ec_point & key, const std::string & str){
if (str.size() != sizeof(key.data)){
throw std::invalid_argument(std::string("Key has to have ") + std::to_string(sizeof(key.data)) + " B");
}
memcpy(key.data, str.data(), sizeof(key.data));
}
void string_to_key(::rct::key & key, const std::string & str){
if (str.size() != sizeof(key.bytes)){
throw std::invalid_argument(std::string("Key has to have ") + std::to_string(sizeof(key.bytes)) + " B");
}
memcpy(key.bytes, str.data(), sizeof(key.bytes));
}
namespace crypto {
namespace chacha {
void decrypt(const void* ciphertext, size_t length, const uint8_t* key, const uint8_t* iv, char* plaintext, size_t *plaintext_len){
CHECK_AND_ASSERT_THROW_MES(length >= TAG_SIZE, "Ciphertext length too small");
CHECK_AND_ASSERT_THROW_MES(!plaintext_len || *plaintext_len >= (length - TAG_SIZE), "Plaintext length too small");
unsigned long long int res_len = plaintext_len ? *plaintext_len : length;
auto r = crypto_aead_chacha20poly1305_ietf_decrypt(
reinterpret_cast<unsigned char *>(plaintext), &res_len, nullptr,
static_cast<const unsigned char *>(ciphertext), length, nullptr, 0, iv, key);
if (r != 0){
throw exc::Poly1305TagInvalid();
}
if (plaintext_len){
*plaintext_len = (size_t) res_len;
}
}
}
}
// Cold Key image sync
namespace ki {
bool key_image_data(wallet_shim * wallet,
const std::vector<tools::wallet2::transfer_details> & transfers,
std::vector<MoneroTransferDetails> & res,
bool need_all_additionals)
{
for(auto & td : transfers){
::crypto::public_key tx_pub_key = wallet->get_tx_pub_key_from_received_outs(td);
const std::vector<::crypto::public_key> additional_tx_pub_keys = cryptonote::get_additional_tx_pub_keys_from_extra(td.m_tx);
res.emplace_back();
auto & cres = res.back();
cres.set_out_key(key_to_string(boost::get<cryptonote::txout_to_key>(td.m_tx.vout[td.m_internal_output_index].target).key));
cres.set_tx_pub_key(key_to_string(tx_pub_key));
cres.set_internal_output_index(td.m_internal_output_index);
cres.set_sub_addr_major(td.m_subaddr_index.major);
cres.set_sub_addr_minor(td.m_subaddr_index.minor);
if (need_all_additionals) {
for (auto &aux : additional_tx_pub_keys) {
cres.add_additional_tx_pub_keys(key_to_string(aux));
}
} else if (!additional_tx_pub_keys.empty() && additional_tx_pub_keys.size() > td.m_internal_output_index) {
cres.add_additional_tx_pub_keys(key_to_string(additional_tx_pub_keys[td.m_internal_output_index]));
}
}
return true;
}
std::string compute_hash(const MoneroTransferDetails & rr){
KECCAK_CTX kck;
uint8_t md[32];
CHECK_AND_ASSERT_THROW_MES(rr.out_key().size() == 32, "Invalid out_key size");
CHECK_AND_ASSERT_THROW_MES(rr.tx_pub_key().size() == 32, "Invalid tx_pub_key size");
keccak_init(&kck);
keccak_update(&kck, reinterpret_cast<const uint8_t *>(rr.out_key().data()), 32);
keccak_update(&kck, reinterpret_cast<const uint8_t *>(rr.tx_pub_key().data()), 32);
for (const auto &aux : rr.additional_tx_pub_keys()){
CHECK_AND_ASSERT_THROW_MES(aux.size() == 32, "Invalid aux size");
keccak_update(&kck, reinterpret_cast<const uint8_t *>(aux.data()), 32);
}
auto index_serialized = tools::get_varint_data(rr.internal_output_index());
keccak_update(&kck, reinterpret_cast<const uint8_t *>(index_serialized.data()), index_serialized.size());
keccak_finish(&kck, md);
return std::string(reinterpret_cast<const char*>(md), sizeof(md));
}
void generate_commitment(std::vector<MoneroTransferDetails> & mtds,
const std::vector<tools::wallet2::transfer_details> & transfers,
std::shared_ptr<messages::monero::MoneroKeyImageExportInitRequest> & req,
bool need_subaddr_indices)
{
req = std::make_shared<messages::monero::MoneroKeyImageExportInitRequest>();
KECCAK_CTX kck;
uint8_t final_hash[32];
keccak_init(&kck);
for(auto &cur : mtds){
auto hash = compute_hash(cur);
keccak_update(&kck, reinterpret_cast<const uint8_t *>(hash.data()), hash.size());
}
keccak_finish(&kck, final_hash);
req = std::make_shared<messages::monero::MoneroKeyImageExportInitRequest>();
req->set_hash(std::string(reinterpret_cast<const char*>(final_hash), 32));
req->set_num(transfers.size());
std::unordered_map<uint32_t, std::set<uint32_t>> sub_indices;
for (auto &cur : transfers){
auto search = sub_indices.emplace(cur.m_subaddr_index.major, std::set<uint32_t>());
auto & st = search.first->second;
st.insert(cur.m_subaddr_index.minor);
}
if (need_subaddr_indices) {
for (auto &x: sub_indices) {
auto subs = req->add_subs();
subs->set_account(x.first);
for (auto minor : x.second) {
subs->add_minor_indices(minor);
}
}
}
}
void live_refresh_ack(const ::crypto::secret_key & view_key_priv,
const ::crypto::public_key& out_key,
const std::shared_ptr<messages::monero::MoneroLiveRefreshStepAck> & ack,
::cryptonote::keypair& in_ephemeral,
::crypto::key_image& ki)
{
std::string str_out_key(out_key.data, sizeof(out_key.data));
auto enc_key = protocol::tx::compute_enc_key(view_key_priv, str_out_key, ack->salt());
const size_t len_ciphertext = ack->key_image().size(); // IV || keys
CHECK_AND_ASSERT_THROW_MES(len_ciphertext > crypto::chacha::IV_SIZE + crypto::chacha::TAG_SIZE, "Invalid size");
size_t ki_len = len_ciphertext - crypto::chacha::IV_SIZE - crypto::chacha::TAG_SIZE;
std::unique_ptr<uint8_t[]> plaintext(new uint8_t[ki_len]);
uint8_t * buff = plaintext.get();
protocol::crypto::chacha::decrypt(
ack->key_image().data() + crypto::chacha::IV_SIZE,
len_ciphertext - crypto::chacha::IV_SIZE,
reinterpret_cast<const uint8_t *>(enc_key.data),
reinterpret_cast<const uint8_t *>(ack->key_image().data()),
reinterpret_cast<char *>(buff), &ki_len);
CHECK_AND_ASSERT_THROW_MES(ki_len == 3*32, "Invalid size");
::crypto::signature sig{};
memcpy(ki.data, buff, 32);
memcpy(sig.c.data, buff + 32, 32);
memcpy(sig.r.data, buff + 64, 32);
in_ephemeral.pub = out_key;
in_ephemeral.sec = ::crypto::null_skey;
// Verification
std::vector<const ::crypto::public_key*> pkeys;
pkeys.push_back(&out_key);
CHECK_AND_ASSERT_THROW_MES(rct::scalarmultKey(rct::ki2rct(ki), rct::curveOrder()) == rct::identity(),
"Key image out of validity domain: key image " << epee::string_tools::pod_to_hex(ki));
CHECK_AND_ASSERT_THROW_MES(::crypto::check_ring_signature((const ::crypto::hash&)ki, ki, pkeys, &sig),
"Signature failed for key image " << epee::string_tools::pod_to_hex(ki)
<< ", signature " + epee::string_tools::pod_to_hex(sig)
<< ", pubkey " + epee::string_tools::pod_to_hex(*pkeys[0]));
}
}
// Cold transaction signing
namespace tx {
void translate_address(MoneroAccountPublicAddress * dst, const cryptonote::account_public_address * src){
dst->set_view_public_key(key_to_string(src->m_view_public_key));
dst->set_spend_public_key(key_to_string(src->m_spend_public_key));
}
void translate_dst_entry(MoneroTransactionDestinationEntry * dst, const cryptonote::tx_destination_entry * src){
dst->set_amount(src->amount);
dst->set_is_subaddress(src->is_subaddress);
dst->set_is_integrated(src->is_integrated);
dst->set_original(src->original);
translate_address(dst->mutable_addr(), &(src->addr));
}
void translate_klrki(MoneroMultisigKLRki * dst, const rct::multisig_kLRki * src){
dst->set_k(key_to_string(src->k));
dst->set_l(key_to_string(src->L));
dst->set_r(key_to_string(src->R));
dst->set_ki(key_to_string(src->ki));
}
void translate_rct_key(MoneroRctKey * dst, const rct::ctkey * src){
dst->set_dest(key_to_string(src->dest));
dst->set_commitment(key_to_string(src->mask));
}
std::string hash_addr(const MoneroAccountPublicAddress * addr, boost::optional<uint64_t> amount, boost::optional<bool> is_subaddr){
return hash_addr(addr->spend_public_key(), addr->view_public_key(), amount, is_subaddr);
}
std::string hash_addr(const std::string & spend_key, const std::string & view_key, boost::optional<uint64_t> amount, boost::optional<bool> is_subaddr){
::crypto::public_key spend{}, view{};
if (spend_key.size() != 32 || view_key.size() != 32){
throw std::invalid_argument("Public keys have invalid sizes");
}
memcpy(spend.data, spend_key.data(), 32);
memcpy(view.data, view_key.data(), 32);
return hash_addr(&spend, &view, amount, is_subaddr);
}
std::string hash_addr(const ::crypto::public_key * spend_key, const ::crypto::public_key * view_key, boost::optional<uint64_t> amount, boost::optional<bool> is_subaddr){
char buff[64+8+1];
size_t offset = 0;
memcpy(buff + offset, spend_key->data, 32); offset += 32;
memcpy(buff + offset, view_key->data, 32); offset += 32;
if (amount){
memcpy(buff + offset, (uint8_t*) &(amount.get()), sizeof(amount.get())); offset += sizeof(amount.get());
}
if (is_subaddr){
buff[offset] = is_subaddr.get();
offset += 1;
}
return std::string(buff, offset);
}
::crypto::secret_key compute_enc_key(const ::crypto::secret_key & private_view_key, const std::string & aux, const std::string & salt)
{
uint8_t hash[32];
KECCAK_CTX ctx;
::crypto::secret_key res;
keccak_init(&ctx);
keccak_update(&ctx, (const uint8_t *) private_view_key.data, sizeof(private_view_key.data));
if (!aux.empty()){
keccak_update(&ctx, (const uint8_t *) aux.data(), aux.size());
}
keccak_finish(&ctx, hash);
keccak(hash, sizeof(hash), hash, sizeof(hash));
hmac_keccak_hash(hash, (const uint8_t *) salt.data(), salt.size(), hash, sizeof(hash));
memcpy(res.data, hash, sizeof(hash));
memwipe(hash, sizeof(hash));
return res;
}
std::string compute_sealing_key(const std::string & master_key, size_t idx, bool is_iv)
{
// master-key-32B || domain-sep-12B || index-4B
uint8_t hash[32] = {0};
KECCAK_CTX ctx;
std::string sep = is_iv ? "sig-iv" : "sig-key";
std::string idx_data = tools::get_varint_data(idx);
if (idx_data.size() > 4){
throw std::invalid_argument("index is too big");
}
keccak_init(&ctx);
keccak_update(&ctx, (const uint8_t *) master_key.data(), master_key.size());
keccak_update(&ctx, (const uint8_t *) sep.data(), sep.size());
keccak_update(&ctx, hash, 12 - sep.size());
keccak_update(&ctx, (const uint8_t *) idx_data.data(), idx_data.size());
if (idx_data.size() < 4) {
keccak_update(&ctx, hash, 4 - idx_data.size());
}
keccak_finish(&ctx, hash);
keccak(hash, sizeof(hash), hash, sizeof(hash));
return std::string((const char*) hash, 32);
}
TData::TData() {
rsig_type = 0;
bp_version = 0;
cur_input_idx = 0;
cur_output_idx = 0;
cur_batch_idx = 0;
cur_output_in_batch_idx = 0;
}
Signer::Signer(wallet_shim *wallet2, const unsigned_tx_set * unsigned_tx, size_t tx_idx, hw::tx_aux_data * aux_data) {
m_wallet2 = wallet2;
m_unsigned_tx = unsigned_tx;
m_aux_data = aux_data;
m_tx_idx = tx_idx;
m_ct.tx_data = cur_src_tx();
m_multisig = false;
m_client_version = 1;
}
void Signer::extract_payment_id(){
const std::vector<uint8_t>& tx_extra = cur_tx().extra;
m_ct.tsx_data.set_payment_id("");
std::vector<cryptonote::tx_extra_field> tx_extra_fields;
cryptonote::parse_tx_extra(tx_extra, tx_extra_fields); // ok if partially parsed
cryptonote::tx_extra_nonce extra_nonce;
::crypto::hash payment_id{};
if (find_tx_extra_field_by_type(tx_extra_fields, extra_nonce))
{
::crypto::hash8 payment_id8{};
if(cryptonote::get_encrypted_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id8))
{
m_ct.tsx_data.set_payment_id(std::string(payment_id8.data, 8));
}
else if (cryptonote::get_payment_id_from_tx_extra_nonce(extra_nonce.nonce, payment_id))
{
m_ct.tsx_data.set_payment_id(std::string(payment_id.data, 32));
}
}
}
static unsigned get_rsig_type(const rct::RCTConfig &rct_config, size_t num_outputs){
if (rct_config.range_proof_type == rct::RangeProofBorromean){
return rct::RangeProofBorromean;
} else if (num_outputs > BULLETPROOF_MAX_OUTPUTS){
return rct::RangeProofMultiOutputBulletproof;
} else {
return rct::RangeProofPaddedBulletproof;
}
}
static void generate_rsig_batch_sizes(std::vector<uint64_t> &batches, unsigned rsig_type, size_t num_outputs){
size_t amount_batched = 0;
while(amount_batched < num_outputs){
if (rsig_type == rct::RangeProofBorromean || rsig_type == rct::RangeProofBulletproof) {
batches.push_back(1);
amount_batched += 1;
} else if (rsig_type == rct::RangeProofPaddedBulletproof){
if (num_outputs > BULLETPROOF_MAX_OUTPUTS){
throw std::invalid_argument("BP padded can support only BULLETPROOF_MAX_OUTPUTS statements");
}
batches.push_back(num_outputs);
amount_batched += num_outputs;
} else if (rsig_type == rct::RangeProofMultiOutputBulletproof){
size_t batch_size = 1;
while (batch_size * 2 + amount_batched <= num_outputs && batch_size * 2 <= BULLETPROOF_MAX_OUTPUTS){
batch_size *= 2;
}
batch_size = std::min(batch_size, num_outputs - amount_batched);
batches.push_back(batch_size);
amount_batched += batch_size;
} else {
throw std::invalid_argument("Unknown rsig type");
}
}
}
void Signer::set_tx_input(MoneroTransactionSourceEntry * dst, size_t idx, bool need_ring_keys, bool need_ring_indices){
const cryptonote::tx_source_entry & src = cur_tx().sources[idx];
const tools::wallet2::transfer_details & transfer = get_source_transfer(idx);
dst->set_real_output(src.real_output);
for(size_t i = 0; i < src.outputs.size(); ++i){
auto & cur = src.outputs[i];
auto out = dst->add_outputs();
if (i == src.real_output || need_ring_indices || client_version() <= 1) {
out->set_idx(cur.first);
}
if (i == src.real_output || need_ring_keys || client_version() <= 1) {
translate_rct_key(out->mutable_key(), &(cur.second));
}
}
dst->set_real_out_tx_key(key_to_string(src.real_out_tx_key));
dst->set_real_output_in_tx_index(src.real_output_in_tx_index);
if (client_version() <= 1) {
for (auto &cur : src.real_out_additional_tx_keys) {
dst->add_real_out_additional_tx_keys(key_to_string(cur));
}
} else if (!src.real_out_additional_tx_keys.empty()) {
dst->add_real_out_additional_tx_keys(key_to_string(src.real_out_additional_tx_keys.at(src.real_output_in_tx_index)));
}
dst->set_amount(src.amount);
dst->set_rct(src.rct);
dst->set_mask(key_to_string(src.mask));
translate_klrki(dst->mutable_multisig_klrki(), &(src.multisig_kLRki));
dst->set_subaddr_minor(transfer.m_subaddr_index.minor);
}
void Signer::compute_integrated_indices(TsxData * tsx_data){
if (m_aux_data == nullptr || m_aux_data->tx_recipients.empty()){
return;
}
auto & chg = tsx_data->change_dts();
std::string change_hash = hash_addr(&chg.addr(), chg.amount(), chg.is_subaddress());
std::vector<uint32_t> integrated_indices;
std::set<std::string> integrated_hashes;
for (auto & cur : m_aux_data->tx_recipients){
if (!cur.has_payment_id){
continue;
}
integrated_hashes.emplace(hash_addr(&cur.address.m_spend_public_key, &cur.address.m_view_public_key));
}
ssize_t idx = -1;
for (auto & cur : tsx_data->outputs()){
idx += 1;
std::string c_hash = hash_addr(&cur.addr(), cur.amount(), cur.is_subaddress());
if (c_hash == change_hash || cur.is_subaddress()){
continue;
}
c_hash = hash_addr(&cur.addr());
if (integrated_hashes.find(c_hash) != integrated_hashes.end()){
integrated_indices.push_back((uint32_t)idx);
}
}
if (!integrated_indices.empty()){
assign_to_repeatable(tsx_data->mutable_integrated_indices(), integrated_indices.begin(), integrated_indices.end());
}
}
std::shared_ptr<messages::monero::MoneroTransactionInitRequest> Signer::step_init(){
// extract payment ID from construction data
auto & tsx_data = m_ct.tsx_data;
auto & tx = cur_tx();
const size_t input_size = tx.sources.size();
m_ct.tx.version = 2;
m_ct.tx.unlock_time = tx.unlock_time;
m_client_version = (m_aux_data->client_version ? m_aux_data->client_version.get() : 1);
tsx_data.set_version(1);
tsx_data.set_client_version(client_version());
tsx_data.set_unlock_time(tx.unlock_time);
tsx_data.set_num_inputs(static_cast<google::protobuf::uint32>(input_size));
tsx_data.set_mixin(static_cast<google::protobuf::uint32>(tx.sources[0].outputs.size() - 1));
tsx_data.set_account(tx.subaddr_account);
tsx_data.set_monero_version(std::string(MONERO_VERSION) + "|" + MONERO_VERSION_TAG);
tsx_data.set_hard_fork(m_aux_data->hard_fork ? m_aux_data->hard_fork.get() : 0);
if (client_version() <= 1){
assign_to_repeatable(tsx_data.mutable_minor_indices(), tx.subaddr_indices.begin(), tx.subaddr_indices.end());
}
// TODO: use HF_VERSION_CLSAG after CLSAG is merged
if (tsx_data.hard_fork() >= 13){
throw exc::ProtocolException("CLSAG is not yet implemented");
}
// Rsig decision
auto rsig_data = tsx_data.mutable_rsig_data();
m_ct.rsig_type = get_rsig_type(tx.rct_config, tx.splitted_dsts.size());
rsig_data->set_rsig_type(m_ct.rsig_type);
if (tx.rct_config.range_proof_type != rct::RangeProofBorromean){
m_ct.bp_version = (m_aux_data->bp_version ? m_aux_data->bp_version.get() : 1);
rsig_data->set_bp_version((uint32_t) m_ct.bp_version);
}
generate_rsig_batch_sizes(m_ct.grouping_vct, m_ct.rsig_type, tx.splitted_dsts.size());
assign_to_repeatable(rsig_data->mutable_grouping(), m_ct.grouping_vct.begin(), m_ct.grouping_vct.end());
translate_dst_entry(tsx_data.mutable_change_dts(), &(tx.change_dts));
for(auto & cur : tx.splitted_dsts){
auto dst = tsx_data.mutable_outputs()->Add();
translate_dst_entry(dst, &cur);
}
m_ct.source_permutation.clear();
for (size_t n = 0; n < input_size; ++n){
m_ct.source_permutation.push_back(n);
}
compute_integrated_indices(&tsx_data);
int64_t fee = 0;
for(auto & cur_in : tx.sources){
fee += cur_in.amount;
}
for(auto & cur_out : tx.splitted_dsts){
fee -= cur_out.amount;
}
if (fee < 0){
throw std::invalid_argument("Fee cannot be negative");
}
tsx_data.set_fee(static_cast<google::protobuf::uint64>(fee));
this->extract_payment_id();
auto init_req = std::make_shared<messages::monero::MoneroTransactionInitRequest>();
init_req->set_version(0);
init_req->mutable_tsx_data()->CopyFrom(tsx_data);
return init_req;
}
void Signer::step_init_ack(std::shared_ptr<const messages::monero::MoneroTransactionInitAck> ack){
if (ack->has_rsig_data()){
m_ct.rsig_param = std::make_shared<MoneroRsigData>(ack->rsig_data());
}
assign_from_repeatable(&(m_ct.tx_out_entr_hmacs), ack->hmacs().begin(), ack->hmacs().end());
}
std::shared_ptr<messages::monero::MoneroTransactionSetInputRequest> Signer::step_set_input(size_t idx){
CHECK_AND_ASSERT_THROW_MES(idx < cur_tx().sources.size(), "Invalid source index");
m_ct.cur_input_idx = idx;
auto res = std::make_shared<messages::monero::MoneroTransactionSetInputRequest>();
set_tx_input(res->mutable_src_entr(), idx, false, true);
return res;
}
void Signer::step_set_input_ack(std::shared_ptr<const messages::monero::MoneroTransactionSetInputAck> ack){
auto & vini_str = ack->vini();
cryptonote::txin_v vini;
if (!cn_deserialize(vini_str.data(), vini_str.size(), vini)){
throw exc::ProtocolException("Cannot deserialize vin[i]");
}
m_ct.tx.vin.emplace_back(vini);
m_ct.tx_in_hmacs.push_back(ack->vini_hmac());
m_ct.pseudo_outs.push_back(ack->pseudo_out());
m_ct.pseudo_outs_hmac.push_back(ack->pseudo_out_hmac());
m_ct.alphas.push_back(ack->pseudo_out_alpha());
m_ct.spend_encs.push_back(ack->spend_key());
}
void Signer::sort_ki(){
const size_t input_size = cur_tx().sources.size();
CHECK_AND_ASSERT_THROW_MES(m_ct.tx.vin.size() == input_size, "Invalid vector size");
std::sort(m_ct.source_permutation.begin(), m_ct.source_permutation.end(), [&](const size_t i0, const size_t i1) {
const cryptonote::txin_to_key &tk0 = boost::get<cryptonote::txin_to_key>(m_ct.tx.vin[i0]);
const cryptonote::txin_to_key &tk1 = boost::get<cryptonote::txin_to_key>(m_ct.tx.vin[i1]);
return memcmp(&tk0.k_image, &tk1.k_image, sizeof(tk0.k_image)) > 0;
});
CHECK_AND_ASSERT_THROW_MES(m_ct.tx_in_hmacs.size() == input_size, "Invalid vector size");
CHECK_AND_ASSERT_THROW_MES(m_ct.pseudo_outs.size() == input_size, "Invalid vector size");
CHECK_AND_ASSERT_THROW_MES(m_ct.pseudo_outs_hmac.size() == input_size, "Invalid vector size");
CHECK_AND_ASSERT_THROW_MES(m_ct.alphas.size() == input_size, "Invalid vector size");
CHECK_AND_ASSERT_THROW_MES(m_ct.spend_encs.size() == input_size, "Invalid vector size");
CHECK_AND_ASSERT_THROW_MES(m_ct.tx_data.sources.size() == input_size, "Invalid vector size");
tools::apply_permutation(m_ct.source_permutation, [&](size_t i0, size_t i1){
std::swap(m_ct.tx.vin[i0], m_ct.tx.vin[i1]);
std::swap(m_ct.tx_in_hmacs[i0], m_ct.tx_in_hmacs[i1]);
std::swap(m_ct.pseudo_outs[i0], m_ct.pseudo_outs[i1]);
std::swap(m_ct.pseudo_outs_hmac[i0], m_ct.pseudo_outs_hmac[i1]);
std::swap(m_ct.alphas[i0], m_ct.alphas[i1]);
std::swap(m_ct.spend_encs[i0], m_ct.spend_encs[i1]);
std::swap(m_ct.tx_data.sources[i0], m_ct.tx_data.sources[i1]);
});
}
std::shared_ptr<messages::monero::MoneroTransactionInputsPermutationRequest> Signer::step_permutation(){
sort_ki();
if (client_version() >= 2){
return nullptr;
}
auto res = std::make_shared<messages::monero::MoneroTransactionInputsPermutationRequest>();
assign_to_repeatable(res->mutable_perm(), m_ct.source_permutation.begin(), m_ct.source_permutation.end());
return res;
}
void Signer::step_permutation_ack(std::shared_ptr<const messages::monero::MoneroTransactionInputsPermutationAck> ack){
}
std::shared_ptr<messages::monero::MoneroTransactionInputViniRequest> Signer::step_set_vini_input(size_t idx){
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_data.sources.size(), "Invalid transaction index");
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx.vin.size(), "Invalid transaction index");
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_in_hmacs.size(), "Invalid transaction index");
m_ct.cur_input_idx = idx;
auto tx = m_ct.tx_data;
auto res = std::make_shared<messages::monero::MoneroTransactionInputViniRequest>();
auto & vini = m_ct.tx.vin[idx];
set_tx_input(res->mutable_src_entr(), idx, false, false);
res->set_vini(cryptonote::t_serializable_object_to_blob(vini));
res->set_vini_hmac(m_ct.tx_in_hmacs[idx]);
res->set_orig_idx(m_ct.source_permutation[idx]);
return res;
}
void Signer::step_set_vini_input_ack(std::shared_ptr<const messages::monero::MoneroTransactionInputViniAck> ack){
}
std::shared_ptr<messages::monero::MoneroTransactionAllInputsSetRequest> Signer::step_all_inputs_set(){
return std::make_shared<messages::monero::MoneroTransactionAllInputsSetRequest>();
}
void Signer::step_all_inputs_set_ack(std::shared_ptr<const messages::monero::MoneroTransactionAllInputsSetAck> ack){
}
std::shared_ptr<messages::monero::MoneroTransactionSetOutputRequest> Signer::step_set_output(size_t idx){
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_data.splitted_dsts.size(), "Invalid transaction index");
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_out_entr_hmacs.size(), "Invalid transaction index");
CHECK_AND_ASSERT_THROW_MES(is_req_bulletproof(), "Borromean rsig not supported");
m_ct.cur_output_idx = idx;
m_ct.cur_output_in_batch_idx += 1; // assumes sequential call to step_set_output()
auto res = std::make_shared<messages::monero::MoneroTransactionSetOutputRequest>();
auto & cur_dst = m_ct.tx_data.splitted_dsts[idx];
translate_dst_entry(res->mutable_dst_entr(), &cur_dst);
res->set_dst_entr_hmac(m_ct.tx_out_entr_hmacs[idx]);
return res;
}
void Signer::step_set_output_ack(std::shared_ptr<const messages::monero::MoneroTransactionSetOutputAck> ack){
cryptonote::tx_out tx_out;
rct::Bulletproof bproof{};
rct::ctkey out_pk{};
rct::ecdhTuple ecdh{};
bool has_rsig = false;
std::string rsig_buff;
if (ack->has_rsig_data()){
auto & rsig_data = ack->rsig_data();
if (rsig_data.has_rsig() && !rsig_data.rsig().empty()){
has_rsig = true;
rsig_buff = rsig_data.rsig();
}
if (client_version() >= 1 && rsig_data.has_mask()){
rct::key cmask{};
string_to_key(cmask, rsig_data.mask());
m_ct.rsig_gamma.emplace_back(cmask);
}
}
if (!cn_deserialize(ack->tx_out(), tx_out)){
throw exc::ProtocolException("Cannot deserialize vout[i]");
}
if (!cn_deserialize(ack->out_pk(), out_pk)){
throw exc::ProtocolException("Cannot deserialize out_pk");
}
if (m_ct.bp_version <= 1) {
if (!cn_deserialize(ack->ecdh_info(), ecdh)){
throw exc::ProtocolException("Cannot deserialize ecdhtuple");
}
} else {
CHECK_AND_ASSERT_THROW_MES(8 == ack->ecdh_info().size(), "Invalid ECDH.amount size");
memcpy(ecdh.amount.bytes, ack->ecdh_info().data(), 8);
}
if (has_rsig && is_req_bulletproof() && !cn_deserialize(rsig_buff, bproof)){
throw exc::ProtocolException("Cannot deserialize bulletproof rangesig");
}
m_ct.tx.vout.emplace_back(tx_out);
m_ct.tx_out_hmacs.push_back(ack->vouti_hmac());
m_ct.tx_out_pk.emplace_back(out_pk);
m_ct.tx_out_ecdh.emplace_back(ecdh);
// ClientV0, if no rsig was generated on Trezor, do not continue.
// ClientV1+ generates BP after all masks in the current batch are generated
if (!has_rsig || (client_version() >= 1 && is_offloading())){
return;
}
process_bproof(bproof);
m_ct.cur_batch_idx += 1;
m_ct.cur_output_in_batch_idx = 0;
}
bool Signer::should_compute_bp_now() const {
CHECK_AND_ASSERT_THROW_MES(m_ct.cur_batch_idx < m_ct.grouping_vct.size(), "Invalid batch index");
return m_ct.grouping_vct[m_ct.cur_batch_idx] <= m_ct.cur_output_in_batch_idx;
}
void Signer::compute_bproof(messages::monero::MoneroTransactionRsigData & rsig_data){
auto batch_size = m_ct.grouping_vct[m_ct.cur_batch_idx];
std::vector<uint64_t> amounts;
rct::keyV masks;
CHECK_AND_ASSERT_THROW_MES(m_ct.cur_output_idx + 1 >= batch_size, "Invalid index for batching");
for(size_t i = 0; i < batch_size; ++i){
const size_t bidx = 1 + m_ct.cur_output_idx - batch_size + i;
CHECK_AND_ASSERT_THROW_MES(bidx < m_ct.tx_data.splitted_dsts.size(), "Invalid gamma index");
CHECK_AND_ASSERT_THROW_MES(bidx < m_ct.rsig_gamma.size(), "Invalid gamma index");
amounts.push_back(m_ct.tx_data.splitted_dsts[bidx].amount);
masks.push_back(m_ct.rsig_gamma[bidx]);
}
auto bp = bulletproof_PROVE(amounts, masks);
auto serRsig = cn_serialize(bp);
m_ct.tx_out_rsigs.emplace_back(bp);
rsig_data.set_rsig(serRsig);
}
void Signer::process_bproof(rct::Bulletproof & bproof){
CHECK_AND_ASSERT_THROW_MES(m_ct.cur_batch_idx < m_ct.grouping_vct.size(), "Invalid batch index");
auto batch_size = m_ct.grouping_vct[m_ct.cur_batch_idx];
for (size_t i = 0; i < batch_size; ++i){
const size_t bidx = 1 + m_ct.cur_output_idx - batch_size + i;
CHECK_AND_ASSERT_THROW_MES(bidx < m_ct.tx_out_pk.size(), "Invalid out index");
rct::key commitment = m_ct.tx_out_pk[bidx].mask;
commitment = rct::scalarmultKey(commitment, rct::INV_EIGHT);
bproof.V.push_back(commitment);
}
m_ct.tx_out_rsigs.emplace_back(bproof);
if (!rct::bulletproof_VERIFY(boost::get<rct::Bulletproof>(m_ct.tx_out_rsigs.back()))) {
throw exc::ProtocolException("Returned range signature is invalid");
}
}
std::shared_ptr<messages::monero::MoneroTransactionSetOutputRequest> Signer::step_rsig(size_t idx){
if (!is_offloading() || !should_compute_bp_now()){
return nullptr;
}
auto res = std::make_shared<messages::monero::MoneroTransactionSetOutputRequest>();
auto & cur_dst = m_ct.tx_data.splitted_dsts[idx];
translate_dst_entry(res->mutable_dst_entr(), &cur_dst);
res->set_dst_entr_hmac(m_ct.tx_out_entr_hmacs[idx]);
compute_bproof(*(res->mutable_rsig_data()));
res->set_is_offloaded_bp(true);
return res;
}
void Signer::step_set_rsig_ack(std::shared_ptr<const messages::monero::MoneroTransactionSetOutputAck> ack){
m_ct.cur_batch_idx += 1;
m_ct.cur_output_in_batch_idx = 0;
}
std::shared_ptr<messages::monero::MoneroTransactionAllOutSetRequest> Signer::step_all_outs_set(){
return std::make_shared<messages::monero::MoneroTransactionAllOutSetRequest>();
}
void Signer::step_all_outs_set_ack(std::shared_ptr<const messages::monero::MoneroTransactionAllOutSetAck> ack, hw::device &hwdev){
m_ct.rv = std::make_shared<rct::rctSig>();
m_ct.rv->txnFee = ack->rv().txn_fee();
m_ct.rv->type = static_cast<uint8_t>(ack->rv().rv_type());
string_to_key(m_ct.rv->message, ack->rv().message());
// Extra copy
m_ct.tx.extra.clear();
auto extra = ack->extra();
auto extra_data = extra.data();
m_ct.tx.extra.reserve(extra.size());
for(size_t i = 0; i < extra.size(); ++i){
m_ct.tx.extra.push_back(static_cast<uint8_t>(extra_data[i]));
}
::crypto::hash tx_prefix_hash{};
cryptonote::get_transaction_prefix_hash(m_ct.tx, tx_prefix_hash);
m_ct.tx_prefix_hash = key_to_string(tx_prefix_hash);
if (crypto_verify_32(reinterpret_cast<const unsigned char *>(tx_prefix_hash.data),
reinterpret_cast<const unsigned char *>(ack->tx_prefix_hash().data()))){
throw exc::proto::SecurityException("Transaction prefix has does not match to the computed value");
}
// RctSig
auto num_sources = m_ct.tx_data.sources.size();
if (is_simple() || is_req_bulletproof()){
auto dst = &m_ct.rv->pseudoOuts;
if (is_bulletproof()){
dst = &m_ct.rv->p.pseudoOuts;
}
dst->clear();
for (const auto &pseudo_out : m_ct.pseudo_outs) {
dst->emplace_back();
string_to_key(dst->back(), pseudo_out);
}
m_ct.rv->mixRing.resize(num_sources);
} else {
m_ct.rv->mixRing.resize(m_ct.tsx_data.mixin());
m_ct.rv->mixRing[0].resize(num_sources);
}
CHECK_AND_ASSERT_THROW_MES(m_ct.tx_out_pk.size() == m_ct.tx_out_ecdh.size(), "Invalid vector sizes");
for(size_t i = 0; i < m_ct.tx_out_ecdh.size(); ++i){
m_ct.rv->outPk.push_back(m_ct.tx_out_pk[i]);
m_ct.rv->ecdhInfo.push_back(m_ct.tx_out_ecdh[i]);
}
for(size_t i = 0; i < m_ct.tx_out_rsigs.size(); ++i){
if (is_bulletproof()){
m_ct.rv->p.bulletproofs.push_back(boost::get<rct::Bulletproof>(m_ct.tx_out_rsigs[i]));
} else {
m_ct.rv->p.rangeSigs.push_back(boost::get<rct::rangeSig>(m_ct.tx_out_rsigs[i]));
}
}
rct::key hash_computed = rct::get_pre_mlsag_hash(*(m_ct.rv), hwdev);
auto & hash = ack->full_message_hash();
if (hash.size() != 32){
throw exc::ProtocolException("Returned mlsag hash has invalid size");
}
if (crypto_verify_32(reinterpret_cast<const unsigned char *>(hash_computed.bytes),
reinterpret_cast<const unsigned char *>(hash.data()))){
throw exc::proto::SecurityException("Computed MLSAG does not match");
}
}
std::shared_ptr<messages::monero::MoneroTransactionSignInputRequest> Signer::step_sign_input(size_t idx){
m_ct.cur_input_idx = idx;
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_data.sources.size(), "Invalid transaction index");
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx.vin.size(), "Invalid transaction index");
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.tx_in_hmacs.size(), "Invalid transaction index");
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.alphas.size(), "Invalid transaction index");
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.spend_encs.size(), "Invalid transaction index");
auto res = std::make_shared<messages::monero::MoneroTransactionSignInputRequest>();
set_tx_input(res->mutable_src_entr(), idx, true, true);
res->set_vini(cryptonote::t_serializable_object_to_blob(m_ct.tx.vin[idx]));
res->set_vini_hmac(m_ct.tx_in_hmacs[idx]);
res->set_pseudo_out_alpha(m_ct.alphas[idx]);
res->set_spend_key(m_ct.spend_encs[idx]);
res->set_orig_idx(m_ct.source_permutation[idx]);
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.pseudo_outs.size(), "Invalid transaction index");
CHECK_AND_ASSERT_THROW_MES(idx < m_ct.pseudo_outs_hmac.size(), "Invalid transaction index");
res->set_pseudo_out(m_ct.pseudo_outs[idx]);
res->set_pseudo_out_hmac(m_ct.pseudo_outs_hmac[idx]);
return res;
}
void Signer::step_sign_input_ack(std::shared_ptr<const messages::monero::MoneroTransactionSignInputAck> ack){
m_ct.signatures.push_back(ack->signature());
// Sync updated pseudo_outputs, client_version>=1, HF10+
if (client_version() >= 1 && ack->has_pseudo_out()){
CHECK_AND_ASSERT_THROW_MES(m_ct.cur_input_idx < m_ct.pseudo_outs.size(), "Invalid pseudo-out index");
m_ct.pseudo_outs[m_ct.cur_input_idx] = ack->pseudo_out();
if (is_bulletproof()){
CHECK_AND_ASSERT_THROW_MES(m_ct.cur_input_idx < m_ct.rv->p.pseudoOuts.size(), "Invalid pseudo-out index");
string_to_key(m_ct.rv->p.pseudoOuts[m_ct.cur_input_idx], ack->pseudo_out());
} else {
CHECK_AND_ASSERT_THROW_MES(m_ct.cur_input_idx < m_ct.rv->pseudoOuts.size(), "Invalid pseudo-out index");
string_to_key(m_ct.rv->pseudoOuts[m_ct.cur_input_idx], ack->pseudo_out());
}
}
}
std::shared_ptr<messages::monero::MoneroTransactionFinalRequest> Signer::step_final(){
return std::make_shared<messages::monero::MoneroTransactionFinalRequest>();
}
void Signer::step_final_ack(std::shared_ptr<const messages::monero::MoneroTransactionFinalAck> ack){
if (m_multisig){
auto & cout_key = ack->cout_key();
for(auto & cur : m_ct.couts){
if (cur.size() != crypto::chacha::IV_SIZE + 32){
throw std::invalid_argument("Encrypted cout has invalid length");
}
char buff[32];
auto data = cur.data();
crypto::chacha::decrypt(data + crypto::chacha::IV_SIZE, 32, reinterpret_cast<const uint8_t *>(cout_key.data()), reinterpret_cast<const uint8_t *>(data), buff);
m_ct.couts_dec.emplace_back(buff, 32);
}
}
m_ct.enc_salt1 = ack->salt();
m_ct.enc_salt2 = ack->rand_mult();
m_ct.enc_keys = ack->tx_enc_keys();
// Opening the sealed signatures
if (client_version() >= 3){
if(!ack->has_opening_key()){
throw exc::ProtocolException("Client version 3+ requires sealed signatures");
}
for(size_t i = 0; i < m_ct.signatures.size(); ++i){
CHECK_AND_ASSERT_THROW_MES(m_ct.signatures[i].size() > crypto::chacha::TAG_SIZE, "Invalid signature size");
std::string nonce = compute_sealing_key(ack->opening_key(), i, true);
std::string key = compute_sealing_key(ack->opening_key(), i, false);
size_t plen = m_ct.signatures[i].size() - crypto::chacha::TAG_SIZE;
std::unique_ptr<uint8_t[]> plaintext(new uint8_t[plen]);
uint8_t * buff = plaintext.get();
protocol::crypto::chacha::decrypt(
m_ct.signatures[i].data(),
m_ct.signatures[i].size(),
reinterpret_cast<const uint8_t *>(key.data()),
reinterpret_cast<const uint8_t *>(nonce.data()),
reinterpret_cast<char *>(buff), &plen);
m_ct.signatures[i].assign(reinterpret_cast<const char *>(buff), plen);
}
}
// CLSAG support comes here once it is merged to the Monero
m_ct.rv->p.MGs.reserve(m_ct.signatures.size());
for(size_t i = 0; i < m_ct.signatures.size(); ++i) {
rct::mgSig mg;
if (!cn_deserialize(m_ct.signatures[i], mg)) {
throw exc::ProtocolException("Cannot deserialize mg[i]");
}
m_ct.rv->p.MGs.push_back(mg);
}
m_ct.tx.rct_signatures = *(m_ct.rv);
}
std::string Signer::store_tx_aux_info(){
rapidjson::StringBuffer sb;
rapidjson::Writer<rapidjson::StringBuffer> writer(sb);
rapidjson::Document json;
json.SetObject();
rapidjson::Value valueS(rapidjson::kStringType);
rapidjson::Value valueI(rapidjson::kNumberType);
valueI.SetInt(1);
json.AddMember("version", valueI, json.GetAllocator());
valueS.SetString(m_ct.enc_salt1.c_str(), m_ct.enc_salt1.size());
json.AddMember("salt1", valueS, json.GetAllocator());
valueS.SetString(m_ct.enc_salt2.c_str(), m_ct.enc_salt2.size());
json.AddMember("salt2", valueS, json.GetAllocator());
valueS.SetString(m_ct.tx_prefix_hash.c_str(), m_ct.tx_prefix_hash.size());
json.AddMember("tx_prefix_hash", valueS, json.GetAllocator());
valueS.SetString(m_ct.enc_keys.c_str(), m_ct.enc_keys.size());
json.AddMember("enc_keys", valueS, json.GetAllocator());
json.Accept(writer);
return sb.GetString();
}
void load_tx_key_data(hw::device_cold::tx_key_data_t & res, const std::string & data)
{
rapidjson::Document json;
// The contents should be JSON if the wallet follows the new format.
if (json.Parse(data.c_str()).HasParseError())
{
throw std::invalid_argument("Data parsing error");
}
else if(!json.IsObject())
{
throw std::invalid_argument("Data parsing error - not an object");
}
GET_FIELD_FROM_JSON(json, version, int, Int, true, -1);
GET_STRING_FROM_JSON(json, salt1, std::string, true, std::string());
GET_STRING_FROM_JSON(json, salt2, std::string, true, std::string());
GET_STRING_FROM_JSON(json, enc_keys, std::string, true, std::string());
GET_STRING_FROM_JSON(json, tx_prefix_hash, std::string, false, std::string());
if (field_version != 1)
{
throw std::invalid_argument("Unknown version");
}
res.salt1 = field_salt1;
res.salt2 = field_salt2;
res.tx_enc_keys = field_enc_keys;
res.tx_prefix_hash = field_tx_prefix_hash;
}
std::shared_ptr<messages::monero::MoneroGetTxKeyRequest> get_tx_key(
const hw::device_cold::tx_key_data_t & tx_data)
{
auto req = std::make_shared<messages::monero::MoneroGetTxKeyRequest>();
req->set_salt1(tx_data.salt1);
req->set_salt2(tx_data.salt2);
req->set_tx_enc_keys(tx_data.tx_enc_keys);
req->set_tx_prefix_hash(tx_data.tx_prefix_hash);
req->set_reason(0);
return req;
}
void get_tx_key_ack(
std::vector<::crypto::secret_key> & tx_keys,
const std::string & tx_prefix_hash,
const ::crypto::secret_key & view_key_priv,
std::shared_ptr<const messages::monero::MoneroGetTxKeyAck> ack
)
{
auto enc_key = protocol::tx::compute_enc_key(view_key_priv, tx_prefix_hash, ack->salt());
auto & encrypted_keys = ack->has_tx_derivations() ? ack->tx_derivations() : ack->tx_keys();
const size_t len_ciphertext = encrypted_keys.size(); // IV || keys || TAG
CHECK_AND_ASSERT_THROW_MES(len_ciphertext > crypto::chacha::IV_SIZE + crypto::chacha::TAG_SIZE, "Invalid size");
size_t keys_len = len_ciphertext - crypto::chacha::IV_SIZE - crypto::chacha::TAG_SIZE;
std::unique_ptr<uint8_t[]> plaintext(new uint8_t[keys_len]);
protocol::crypto::chacha::decrypt(
encrypted_keys.data() + crypto::chacha::IV_SIZE,
len_ciphertext - crypto::chacha::IV_SIZE,
reinterpret_cast<const uint8_t *>(enc_key.data),
reinterpret_cast<const uint8_t *>(encrypted_keys.data()),
reinterpret_cast<char *>(plaintext.get()), &keys_len);
CHECK_AND_ASSERT_THROW_MES(keys_len % 32 == 0, "Invalid size");
tx_keys.resize(keys_len / 32);
for(unsigned i = 0; i < keys_len / 32; ++i)
{
memcpy(tx_keys[i].data, plaintext.get() + 32 * i, 32);
}
memwipe(plaintext.get(), keys_len);
}
}
}
}
}
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