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https://git.wownero.com/wownero/wownero.git
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e745c1e38d
The basic approach it to delegate all sensitive data (master key, secret ephemeral key, key derivation, ....) and related operations to the device. As device has low memory, it does not keep itself the values (except for view/spend keys) but once computed there are encrypted (with AES are equivalent) and return back to monero-wallet-cli. When they need to be manipulated by the device, they are decrypted on receive. Moreover, using the client for storing the value in encrypted form limits the modification in the client code. Those values are transfered from one C-structure to another one as previously. The code modification has been done with the wishes to be open to any other hardware wallet. To achieve that a C++ class hw::Device has been introduced. Two initial implementations are provided: the "default", which remaps all calls to initial Monero code, and the "Ledger", which delegates all calls to Ledger device.
143 lines
6.8 KiB
C++
143 lines
6.8 KiB
C++
// Copyright (c) 2017-2018, The Monero Project
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without modification, are
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// permitted provided that the following conditions are met:
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//
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// 1. Redistributions of source code must retain the above copyright notice, this list of
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// conditions and the following disclaimer.
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//
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// 2. Redistributions in binary form must reproduce the above copyright notice, this list
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// of conditions and the following disclaimer in the documentation and/or other
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// materials provided with the distribution.
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//
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// 3. Neither the name of the copyright holder nor the names of its contributors may be
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// used to endorse or promote products derived from this software without specific
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// prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
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// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include <unordered_set>
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#include "include_base_utils.h"
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#include "crypto/crypto.h"
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#include "ringct/rctOps.h"
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#include "cryptonote_basic/account.h"
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#include "cryptonote_basic/cryptonote_format_utils.h"
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#include "multisig.h"
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#include "device/device_default.hpp"
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#undef MONERO_DEFAULT_LOG_CATEGORY
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#define MONERO_DEFAULT_LOG_CATEGORY "multisig"
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using namespace std;
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static const rct::key multisig_salt = { {'M', 'u', 'l', 't' , 'i', 's', 'i', 'g', 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 } };
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namespace cryptonote
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{
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//-----------------------------------------------------------------
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crypto::secret_key get_multisig_blinded_secret_key(const crypto::secret_key &key)
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{
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rct::keyV data;
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data.push_back(rct::sk2rct(key));
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data.push_back(multisig_salt);
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return rct::rct2sk(rct::hash_to_scalar(data));
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}
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//-----------------------------------------------------------------
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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)
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{
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// the multisig spend public key is the sum of all spend public keys
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multisig_keys.clear();
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const crypto::secret_key spend_secret_key = get_multisig_blinded_secret_key(keys.m_spend_secret_key);
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CHECK_AND_ASSERT_THROW_MES(crypto::secret_key_to_public_key(spend_secret_key, (crypto::public_key&)spend_pkey), "Failed to derive public key");
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for (const auto &k: spend_keys)
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rct::addKeys(spend_pkey, spend_pkey, rct::pk2rct(k));
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multisig_keys.push_back(spend_secret_key);
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spend_skey = rct::sk2rct(spend_secret_key);
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}
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//-----------------------------------------------------------------
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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)
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{
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multisig_keys.clear();
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spend_pkey = rct::identity();
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spend_skey = rct::zero();
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// create all our composite private keys
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crypto::secret_key blinded_skey = get_multisig_blinded_secret_key(keys.m_spend_secret_key);
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for (const auto &k: spend_keys)
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{
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rct::key sk = rct::scalarmultKey(rct::pk2rct(k), rct::sk2rct(blinded_skey));
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crypto::secret_key msk = get_multisig_blinded_secret_key(rct::rct2sk(sk));
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multisig_keys.push_back(msk);
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sc_add(spend_skey.bytes, spend_skey.bytes, (const unsigned char*)msk.data);
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}
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}
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//-----------------------------------------------------------------
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crypto::secret_key generate_multisig_view_secret_key(const crypto::secret_key &skey, const std::vector<crypto::secret_key> &skeys)
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{
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rct::key view_skey = rct::sk2rct(get_multisig_blinded_secret_key(skey));
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for (const auto &k: skeys)
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sc_add(view_skey.bytes, view_skey.bytes, rct::sk2rct(k).bytes);
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return rct::rct2sk(view_skey);
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}
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//-----------------------------------------------------------------
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crypto::public_key generate_multisig_N1_N_spend_public_key(const std::vector<crypto::public_key> &pkeys)
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{
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rct::key spend_public_key = rct::identity();
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for (const auto &pk: pkeys)
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{
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rct::addKeys(spend_public_key, spend_public_key, rct::pk2rct(pk));
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}
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return rct::rct2pk(spend_public_key);
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}
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//-----------------------------------------------------------------
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bool generate_multisig_key_image(const account_keys &keys, size_t multisig_key_index, const crypto::public_key& out_key, crypto::key_image& ki)
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{
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if (multisig_key_index >= keys.m_multisig_keys.size())
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return false;
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crypto::generate_key_image(out_key, keys.m_multisig_keys[multisig_key_index], ki);
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return true;
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}
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//-----------------------------------------------------------------
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void generate_multisig_LR(const crypto::public_key pkey, const crypto::secret_key &k, crypto::public_key &L, crypto::public_key &R)
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{
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rct::scalarmultBase((rct::key&)L, rct::sk2rct(k));
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crypto::generate_key_image(pkey, k, (crypto::key_image&)R);
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}
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//-----------------------------------------------------------------
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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)
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{
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cryptonote::keypair in_ephemeral;
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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()))
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return false;
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std::unordered_set<crypto::key_image> used;
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for (size_t m = 0; m < keys.m_multisig_keys.size(); ++m)
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{
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crypto::key_image pki;
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bool r = cryptonote::generate_multisig_key_image(keys, m, out_key, pki);
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if (!r)
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return false;
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used.insert(pki);
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}
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for (const auto &pki: pkis)
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{
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if (used.find(pki) == used.end())
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{
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used.insert(pki);
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rct::addKeys((rct::key&)ki, rct::ki2rct(ki), rct::ki2rct(pki));
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}
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}
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return true;
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}
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//-----------------------------------------------------------------
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}
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