You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
190 lines
8.6 KiB
190 lines
8.6 KiB
// 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 <unordered_set>
|
|
#include "include_base_utils.h"
|
|
#include "crypto/crypto.h"
|
|
#include "ringct/rctOps.h"
|
|
#include "cryptonote_basic/account.h"
|
|
#include "cryptonote_basic/cryptonote_format_utils.h"
|
|
#include "multisig.h"
|
|
#include "cryptonote_config.h"
|
|
|
|
#undef MONERO_DEFAULT_LOG_CATEGORY
|
|
#define MONERO_DEFAULT_LOG_CATEGORY "multisig"
|
|
|
|
using namespace std;
|
|
|
|
namespace cryptonote
|
|
{
|
|
//-----------------------------------------------------------------
|
|
crypto::secret_key get_multisig_blinded_secret_key(const crypto::secret_key &key)
|
|
{
|
|
rct::key multisig_salt;
|
|
static_assert(sizeof(rct::key) == sizeof(config::HASH_KEY_MULTISIG), "Hash domain separator is an unexpected size");
|
|
memcpy(multisig_salt.bytes, config::HASH_KEY_MULTISIG, sizeof(rct::key));
|
|
|
|
rct::keyV data;
|
|
data.reserve(2);
|
|
data.push_back(rct::sk2rct(key));
|
|
data.push_back(multisig_salt);
|
|
crypto::secret_key result = rct::rct2sk(rct::hash_to_scalar(data));
|
|
memwipe(&data[0], sizeof(rct::key));
|
|
return result;
|
|
}
|
|
//-----------------------------------------------------------------
|
|
void generate_multisig_N_N(const account_keys &keys, const std::vector<crypto::public_key> &spend_keys, std::vector<crypto::secret_key> &multisig_keys, rct::key &spend_skey, rct::key &spend_pkey)
|
|
{
|
|
// the multisig spend public key is the sum of all spend public keys
|
|
multisig_keys.clear();
|
|
const crypto::secret_key spend_secret_key = get_multisig_blinded_secret_key(keys.m_spend_secret_key);
|
|
CHECK_AND_ASSERT_THROW_MES(crypto::secret_key_to_public_key(spend_secret_key, (crypto::public_key&)spend_pkey), "Failed to derive public key");
|
|
for (const auto &k: spend_keys)
|
|
rct::addKeys(spend_pkey, spend_pkey, rct::pk2rct(k));
|
|
multisig_keys.push_back(spend_secret_key);
|
|
spend_skey = rct::sk2rct(spend_secret_key);
|
|
}
|
|
//-----------------------------------------------------------------
|
|
void generate_multisig_N1_N(const account_keys &keys, const std::vector<crypto::public_key> &spend_keys, std::vector<crypto::secret_key> &multisig_keys, rct::key &spend_skey, rct::key &spend_pkey)
|
|
{
|
|
multisig_keys.clear();
|
|
spend_pkey = rct::identity();
|
|
spend_skey = rct::zero();
|
|
|
|
// create all our composite private keys
|
|
crypto::secret_key blinded_skey = get_multisig_blinded_secret_key(keys.m_spend_secret_key);
|
|
for (const auto &k: spend_keys)
|
|
{
|
|
rct::key sk = rct::scalarmultKey(rct::pk2rct(k), rct::sk2rct(blinded_skey));
|
|
crypto::secret_key msk = get_multisig_blinded_secret_key(rct::rct2sk(sk));
|
|
multisig_keys.push_back(msk);
|
|
sc_add(spend_skey.bytes, spend_skey.bytes, (const unsigned char*)msk.data);
|
|
}
|
|
}
|
|
//-----------------------------------------------------------------
|
|
std::vector<crypto::public_key> generate_multisig_derivations(const account_keys &keys, const std::vector<crypto::public_key> &derivations)
|
|
{
|
|
std::vector<crypto::public_key> multisig_keys;
|
|
crypto::secret_key blinded_skey = get_multisig_blinded_secret_key(keys.m_spend_secret_key);
|
|
for (const auto &k: derivations)
|
|
{
|
|
rct::key d = rct::scalarmultKey(rct::pk2rct(k), rct::sk2rct(blinded_skey));
|
|
multisig_keys.push_back(rct::rct2pk(d));
|
|
}
|
|
|
|
return multisig_keys;
|
|
}
|
|
//-----------------------------------------------------------------
|
|
crypto::secret_key calculate_multisig_signer_key(const std::vector<crypto::secret_key>& multisig_keys)
|
|
{
|
|
rct::key secret_key = rct::zero();
|
|
for (const auto &k: multisig_keys)
|
|
{
|
|
sc_add(secret_key.bytes, secret_key.bytes, (const unsigned char*)k.data);
|
|
}
|
|
|
|
return rct::rct2sk(secret_key);
|
|
}
|
|
//-----------------------------------------------------------------
|
|
std::vector<crypto::secret_key> calculate_multisig_keys(const std::vector<crypto::public_key>& derivations)
|
|
{
|
|
std::vector<crypto::secret_key> multisig_keys;
|
|
multisig_keys.reserve(derivations.size());
|
|
|
|
for (const auto &k: derivations)
|
|
{
|
|
multisig_keys.emplace_back(get_multisig_blinded_secret_key(rct::rct2sk(rct::pk2rct(k))));
|
|
}
|
|
|
|
return multisig_keys;
|
|
}
|
|
//-----------------------------------------------------------------
|
|
crypto::secret_key generate_multisig_view_secret_key(const crypto::secret_key &skey, const std::vector<crypto::secret_key> &skeys)
|
|
{
|
|
rct::key view_skey = rct::sk2rct(get_multisig_blinded_secret_key(skey));
|
|
for (const auto &k: skeys)
|
|
sc_add(view_skey.bytes, view_skey.bytes, rct::sk2rct(k).bytes);
|
|
return rct::rct2sk(view_skey);
|
|
}
|
|
//-----------------------------------------------------------------
|
|
crypto::public_key generate_multisig_M_N_spend_public_key(const std::vector<crypto::public_key> &pkeys)
|
|
{
|
|
rct::key spend_public_key = rct::identity();
|
|
for (const auto &pk: pkeys)
|
|
{
|
|
rct::addKeys(spend_public_key, spend_public_key, rct::pk2rct(pk));
|
|
}
|
|
return rct::rct2pk(spend_public_key);
|
|
}
|
|
//-----------------------------------------------------------------
|
|
bool generate_multisig_key_image(const account_keys &keys, size_t multisig_key_index, const crypto::public_key& out_key, crypto::key_image& ki)
|
|
{
|
|
if (multisig_key_index >= keys.m_multisig_keys.size())
|
|
return false;
|
|
crypto::generate_key_image(out_key, keys.m_multisig_keys[multisig_key_index], ki);
|
|
return true;
|
|
}
|
|
//-----------------------------------------------------------------
|
|
void generate_multisig_LR(const crypto::public_key pkey, const crypto::secret_key &k, crypto::public_key &L, crypto::public_key &R)
|
|
{
|
|
rct::scalarmultBase((rct::key&)L, rct::sk2rct(k));
|
|
crypto::generate_key_image(pkey, k, (crypto::key_image&)R);
|
|
}
|
|
//-----------------------------------------------------------------
|
|
bool generate_multisig_composite_key_image(const account_keys &keys, const std::unordered_map<crypto::public_key, subaddress_index>& subaddresses, const crypto::public_key& out_key, const crypto::public_key &tx_public_key, const std::vector<crypto::public_key>& additional_tx_public_keys, size_t real_output_index, const std::vector<crypto::key_image> &pkis, crypto::key_image &ki)
|
|
{
|
|
cryptonote::keypair in_ephemeral;
|
|
if (!cryptonote::generate_key_image_helper(keys, subaddresses, out_key, tx_public_key, additional_tx_public_keys, real_output_index, in_ephemeral, ki, keys.get_device()))
|
|
return false;
|
|
std::unordered_set<crypto::key_image> used;
|
|
for (size_t m = 0; m < keys.m_multisig_keys.size(); ++m)
|
|
{
|
|
crypto::key_image pki;
|
|
bool r = cryptonote::generate_multisig_key_image(keys, m, out_key, pki);
|
|
if (!r)
|
|
return false;
|
|
used.insert(pki);
|
|
}
|
|
for (const auto &pki: pkis)
|
|
{
|
|
if (used.find(pki) == used.end())
|
|
{
|
|
used.insert(pki);
|
|
rct::addKeys((rct::key&)ki, rct::ki2rct(ki), rct::ki2rct(pki));
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
//-----------------------------------------------------------------
|
|
uint32_t multisig_rounds_required(uint32_t participants, uint32_t threshold)
|
|
{
|
|
CHECK_AND_ASSERT_THROW_MES(participants >= threshold, "participants must be greater or equal than threshold");
|
|
return participants - threshold + 1;
|
|
}
|
|
}
|