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Match surae's recommendation to derive multisig keys

This commit is contained in:
moneromooo-monero 2017-11-04 10:39:17 +00:00
parent a36c261d7a
commit e36f5b6021
No known key found for this signature in database
GPG Key ID: 686F07454D6CEFC3
6 changed files with 49 additions and 37 deletions
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33
src/multisig/multisig.cpp
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@ -39,18 +39,29 @@
using namespace std;
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 } };
namespace cryptonote
{
//-----------------------------------------------------------------
crypto::secret_key get_multisig_blinded_secret_key(const crypto::secret_key &key)
{
rct::keyV data;
data.push_back(rct::sk2rct(key));
data.push_back(multisig_salt);
return rct::rct2sk(rct::hash_to_scalar(data));
}
//-----------------------------------------------------------------
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();
spend_pkey = rct::pk2rct(keys.m_account_address.m_spend_public_key);
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(keys.m_spend_secret_key);
spend_skey = rct::sk2rct(keys.m_spend_secret_key);
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)
@ -60,23 +71,19 @@ namespace cryptonote
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::keyV data;
data.push_back(rct::scalarmultKey(rct::pk2rct(k), rct::sk2rct(keys.m_spend_secret_key)));
static const rct::key 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 } };
data.push_back(salt);
rct::key msk = rct::hash_to_scalar(data);
multisig_keys.push_back(rct::rct2sk(msk));
sc_add(spend_skey.bytes, spend_skey.bytes, msk.bytes);
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);
}
}
//-----------------------------------------------------------------
crypto::secret_key generate_multisig_view_secret_key(const crypto::secret_key &skey, const std::vector<crypto::secret_key> &skeys)
{
crypto::hash hash;
crypto::cn_fast_hash(&skey, sizeof(crypto::hash), hash);
rct::key view_skey = rct::hash2rct(hash);
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);

1
src/multisig/multisig.h
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@ -38,6 +38,7 @@ namespace cryptonote
{
struct account_keys;
crypto::secret_key get_multisig_blinded_secret_key(const crypto::secret_key &key);
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);
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);
crypto::secret_key generate_multisig_view_secret_key(const crypto::secret_key &skey, const std::vector<crypto::secret_key> &skeys);

5
src/simplewallet/simplewallet.cpp
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@ -60,6 +60,7 @@
#include "rapidjson/document.h"
#include "common/json_util.h"
#include "ringct/rctSigs.h"
#include "multisig/multisig.h"
#include "wallet/wallet_args.h"
#include <stdexcept>
@ -801,8 +802,8 @@ bool simple_wallet::make_multisig(const std::vector<std::string> &args)
}
// people may include their own, weed it out
const crypto::secret_key local_skey = m_wallet->get_account().get_keys().m_view_secret_key;
const crypto::public_key local_pkey = m_wallet->get_account().get_keys().m_account_address.m_spend_public_key;
const crypto::secret_key local_skey = cryptonote::get_multisig_blinded_secret_key(m_wallet->get_account().get_keys().m_view_secret_key);
const crypto::public_key local_pkey = m_wallet->get_multisig_signer_public_key(m_wallet->get_account().get_keys().m_spend_secret_key);
for (size_t i = 0; i < secret_keys.size(); ++i)
{
if (secret_keys[i] == local_skey)

31
src/wallet/wallet2.cpp
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@ -2830,8 +2830,6 @@ std::string wallet2::make_multisig(const epee::wipeable_string &password,
// We need an extra step, so we package all the composite public keys
// we know about, and make a signed string out of them
std::string data;
const crypto::public_key &pkey = get_account().get_keys().m_account_address.m_spend_public_key;
data += std::string((const char *)&pkey, sizeof(crypto::public_key));
const crypto::public_key signer = get_multisig_signer_public_key(rct::rct2sk(spend_skey));
data += std::string((const char *)&signer, sizeof(crypto::public_key));
@ -2844,7 +2842,7 @@ std::string wallet2::make_multisig(const epee::wipeable_string &password,
data.resize(data.size() + sizeof(crypto::signature));
crypto::cn_fast_hash(data.data(), data.size() - sizeof(signature), hash);
crypto::signature &signature = *(crypto::signature*)&data[data.size() - sizeof(crypto::signature)];
crypto::generate_signature(hash, pkey, get_account().get_keys().m_spend_secret_key, signature);
crypto::generate_signature(hash, signer, get_multisig_blinded_secret_key(rct::rct2sk(spend_skey)), signature);
extra_multisig_info = std::string("MultisigxV1") + tools::base58::encode(data);
}
@ -2958,19 +2956,18 @@ bool wallet2::finalize_multisig(const epee::wipeable_string &password, const std
std::string wallet2::get_multisig_info() const
{
// It's a signed package of private view key and public spend key
const crypto::secret_key &skey = get_account().get_keys().m_view_secret_key;
const crypto::public_key &pkey = get_account().get_keys().m_account_address.m_spend_public_key;
const crypto::secret_key skey = cryptonote::get_multisig_blinded_secret_key(get_account().get_keys().m_view_secret_key);
const crypto::public_key pkey = get_multisig_signer_public_key(get_account().get_keys().m_spend_secret_key);
crypto::hash hash;
std::string data;
crypto::cn_fast_hash(&skey, sizeof(crypto::secret_key), hash);
data += std::string((const char *)&hash, sizeof(crypto::hash));
data += std::string((const char *)&skey, sizeof(crypto::secret_key));
data += std::string((const char *)&pkey, sizeof(crypto::public_key));
data.resize(data.size() + sizeof(crypto::signature));
crypto::cn_fast_hash(data.data(), data.size() - sizeof(signature), hash);
crypto::signature &signature = *(crypto::signature*)&data[data.size() - sizeof(crypto::signature)];
crypto::generate_signature(hash, pkey, get_account().get_keys().m_spend_secret_key, signature);
crypto::generate_signature(hash, pkey, get_multisig_blinded_secret_key(get_account().get_keys().m_spend_secret_key), signature);
return std::string("MultisigV1") + tools::base58::encode(data);
}
@ -3027,28 +3024,26 @@ bool wallet2::verify_extra_multisig_info(const std::string &data, std::unordered
MERROR("Multisig info decoding error");
return false;
}
if (decoded.size() < sizeof(crypto::public_key) + sizeof(crypto::public_key) + sizeof(crypto::signature))
if (decoded.size() < sizeof(crypto::public_key) + sizeof(crypto::signature))
{
MERROR("Multisig info is corrupt");
return false;
}
if ((decoded.size() - (sizeof(crypto::public_key) + sizeof(crypto::public_key) + sizeof(crypto::signature))) % sizeof(crypto::public_key))
if ((decoded.size() - (sizeof(crypto::public_key) + sizeof(crypto::signature))) % sizeof(crypto::public_key))
{
MERROR("Multisig info is corrupt");
return false;
}
const size_t n_keys = (decoded.size() - (sizeof(crypto::public_key) + sizeof(crypto::public_key) + sizeof(crypto::signature))) / sizeof(crypto::public_key);
const size_t n_keys = (decoded.size() - (sizeof(crypto::public_key) + sizeof(crypto::signature))) / sizeof(crypto::public_key);
size_t offset = 0;
const crypto::public_key &pkey = *(const crypto::public_key*)(decoded.data() + offset);
offset += sizeof(pkey);
signer = *(const crypto::public_key*)(decoded.data() + offset);
offset += sizeof(signer);
const crypto::signature &signature = *(const crypto::signature*)(decoded.data() + offset + n_keys * sizeof(crypto::public_key));
crypto::hash hash;
crypto::cn_fast_hash(decoded.data(), decoded.size() - sizeof(signature), hash);
if (!crypto::check_signature(hash, pkey, signature))
if (!crypto::check_signature(hash, signer, signature))
{
MERROR("Multisig info signature is invalid");
return false;
@ -8313,13 +8308,19 @@ size_t wallet2::import_outputs(const std::vector<tools::wallet2::transfer_detail
crypto::public_key wallet2::get_multisig_signer_public_key(const crypto::secret_key &spend_skey) const
{
crypto::public_key pkey;
crypto::secret_key_to_public_key(spend_skey, pkey);
crypto::secret_key_to_public_key(get_multisig_blinded_secret_key(spend_skey), pkey);
return pkey;
}
//----------------------------------------------------------------------------------------------------
crypto::public_key wallet2::get_multisig_signer_public_key() const
{
CHECK_AND_ASSERT_THROW_MES(m_multisig, "Wallet is not multisig");
if (m_multisig_threshold == m_multisig_signers.size())
{
crypto::public_key signer;
CHECK_AND_ASSERT_THROW_MES(crypto::secret_key_to_public_key(get_account().get_keys().m_spend_secret_key, signer), "Failed to generate signer public key");
return signer;
}
return get_multisig_signer_public_key(get_account().get_keys().m_spend_secret_key);
}
//----------------------------------------------------------------------------------------------------

6
src/wallet/wallet_rpc_server.cpp
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@ -41,6 +41,7 @@ using namespace epee;
#include "common/i18n.h"
#include "cryptonote_basic/cryptonote_format_utils.h"
#include "cryptonote_basic/account.h"
#include "multisig/multisig.h"
#include "wallet_rpc_server_commands_defs.h"
#include "misc_language.h"
#include "string_coding.h"
@ -2424,11 +2425,10 @@ namespace tools
}
// people may include their own, weed it out
crypto::hash hash;
crypto::cn_fast_hash(&m_wallet->get_account().get_keys().m_view_secret_key, sizeof(crypto::secret_key), hash);
crypto::secret_key local_skey = cryptonote::get_multisig_blinded_secret_key(m_wallet->get_account().get_keys().m_view_secret_key);
for (size_t i = 0; i < secret_keys.size(); ++i)
{
if (rct::sk2rct(secret_keys[i]) == rct::hash2rct(hash))
if (rct::sk2rct(secret_keys[i]) == rct::sk2rct(local_skey))
{
secret_keys[i] = secret_keys.back();
public_keys[i] = public_keys.back();

10
tests/core_tests/chaingen.h
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@ -521,10 +521,12 @@ inline bool do_replay_file(const std::string& filename)
{ \
if (msidx_inner != msidx) \
{ \
crypto::hash vkh; \
crypto::cn_fast_hash(&account[msidx_inner].get_keys().m_view_secret_key, sizeof(crypto::secret_key), vkh); \
view_keys[msidx].push_back((const crypto::secret_key&)vkh); \
spend_keys[msidx].push_back(account[msidx_inner].get_keys().m_account_address.m_spend_public_key); \
crypto::secret_key vkh = cryptonote::get_multisig_blinded_secret_key(account[msidx_inner].get_keys().m_view_secret_key); \
view_keys[msidx].push_back(vkh); \
crypto::secret_key skh = cryptonote::get_multisig_blinded_secret_key(account[msidx_inner].get_keys().m_spend_secret_key); \
crypto::public_key pskh; \
crypto::secret_key_to_public_key(skh, pskh); \
spend_keys[msidx].push_back(pskh); \
} \
} \
} \