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use memwipe on secret k/alpha values

Browse source 
Reported by UkoeHB_ and sarang
This commit is contained in:
moneromooo-monero 2020-04-08 16:35:28 +00:00
parent ecb8cc9df4
commit 613071f4fa
No known key found for this signature in database
GPG key ID: 686F07454D6CEFC3
5 changed files with 27 additions and 10 deletions
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6
src/crypto/crypto.cpp
View file

@ -294,6 +294,7 @@ namespace crypto {
sc_mulsub(&sig.r, &sig.c, &unwrap(sec), &k);
if (!sc_isnonzero((const unsigned char*)sig.r.data))
goto try_again;
memwipe(&k, sizeof(k));
}
bool crypto_ops::check_signature(const hash &prefix_hash, const public_key &pub, const signature &sig) {
@ -390,6 +391,8 @@ namespace crypto {
// sig.r = k - sig.c*r
sc_mulsub(&sig.r, &sig.c, &unwrap(r), &k);
memwipe(&k, sizeof(k));
}
bool crypto_ops::check_tx_proof(const hash &prefix_hash, const public_key &R, const public_key &A, const boost::optional<public_key> &B, const public_key &D, const signature &sig) {
@ -560,6 +563,7 @@ POP_WARNINGS
random_scalar(sig[i].c);
random_scalar(sig[i].r);
if (ge_frombytes_vartime(&tmp3, &*pubs[i]) != 0) {
memwipe(&k, sizeof(k));
local_abort("invalid pubkey");
}
ge_double_scalarmult_base_vartime(&tmp2, &sig[i].c, &tmp3, &sig[i].r);
@ -573,6 +577,8 @@ POP_WARNINGS
hash_to_scalar(buf.get(), rs_comm_size(pubs_count), h);
sc_sub(&sig[sec_index].c, &h, &sum);
sc_mulsub(&sig[sec_index].r, &sig[sec_index].c, &unwrap(sec), &k);
memwipe(&k, sizeof(k));
}
bool crypto_ops::check_ring_signature(const hash &prefix_hash, const key_image &image,

7
src/multisig/multisig.cpp
View file

@ -82,6 +82,7 @@ namespace cryptonote
{
rct::key sk = rct::scalarmultKey(rct::pk2rct(k), rct::sk2rct(blinded_skey));
crypto::secret_key msk = get_multisig_blinded_secret_key(rct::rct2sk(sk));
memwipe(&sk, sizeof(sk));
multisig_keys.push_back(msk);
sc_add(spend_skey.bytes, spend_skey.bytes, (const unsigned char*)msk.data);
}
@ -126,10 +127,10 @@ namespace cryptonote
//-----------------------------------------------------------------
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));
crypto::secret_key view_skey = 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);
sc_add((unsigned char*)&view_skey, rct::sk2rct(view_skey).bytes, rct::sk2rct(k).bytes);
return view_skey;
}
//-----------------------------------------------------------------
crypto::public_key generate_multisig_M_N_spend_public_key(const std::vector<crypto::public_key> &pkeys)

5
src/ringct/rctSigs.cpp
View file

@ -29,6 +29,7 @@
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#include "misc_log_ex.h"
#include "misc_language.h"
#include "common/perf_timer.h"
#include "common/threadpool.h"
#include "common/util.h"
@ -108,6 +109,7 @@ namespace rct {
//Borromean (c.f. gmax/andytoshi's paper)
boroSig genBorromean(const key64 x, const key64 P1, const key64 P2, const bits indices) {
key64 L[2], alpha;
auto wiper = epee::misc_utils::create_scope_leave_handler([&](){memwipe(alpha, sizeof(alpha));});
key c;
int naught = 0, prime = 0, ii = 0, jj=0;
boroSig bb;
@ -190,6 +192,7 @@ namespace rct {
vector<geDsmp> Ip(dsRows);
rv.II = keyV(dsRows);
keyV alpha(rows);
auto wiper = epee::misc_utils::create_scope_leave_handler([&](){memwipe(alpha.data(), alpha.size() * sizeof(alpha[0]));});
keyV aG(rows);
rv.ss = keyM(cols, aG);
keyV aHP(dsRows);
@ -548,7 +551,7 @@ namespace rct {
subKeys(M[i][1], pubs[i].mask, Cout);
}
mgSig result = MLSAG_Gen(message, M, sk, kLRki, mscout, index, rows, hwdev);
memwipe(&sk[0], sizeof(key));
memwipe(sk.data(), sk.size() * sizeof(key));
return result;
}

3
src/ringct/rctTypes.h
View file

@ -48,6 +48,7 @@ extern "C" {
#include "hex.h"
#include "span.h"
#include "memwipe.h"
#include "serialization/vector.h"
#include "serialization/debug_archive.h"
#include "serialization/binary_archive.h"
@ -106,6 +107,8 @@ namespace rct {
key L;
key R;
key ki;
~multisig_kLRki() { memwipe(&k, sizeof(k)); }
};
struct multisig_out {

16
src/wallet/wallet2.cpp
View file

@ -4801,6 +4801,7 @@ std::string wallet2::make_multisig(const epee::wipeable_string &password,
std::vector<crypto::secret_key> multisig_keys;
rct::key spend_pkey = rct::identity();
rct::key spend_skey;
auto wiper = epee::misc_utils::create_scope_leave_handler([&](){memwipe(&spend_skey, sizeof(spend_skey));});
std::vector<crypto::public_key> multisig_signers;
// decrypt keys
@ -6411,7 +6412,7 @@ void wallet2::commit_tx(pending_tx& ptx)
// tx generated, get rid of used k values
for (size_t idx: ptx.selected_transfers)
m_transfers[idx].m_multisig_k.clear();
memwipe(m_transfers[idx].m_multisig_k.data(), m_transfers[idx].m_multisig_k.size() * sizeof(m_transfers[idx].m_multisig_k[0]));
//fee includes dust if dust policy specified it.
LOG_PRINT_L1("Transaction successfully sent. <" << txid << ">" << ENDL
@ -6853,13 +6854,13 @@ std::string wallet2::save_multisig_tx(multisig_tx_set txs)
// txes generated, get rid of used k values
for (size_t n = 0; n < txs.m_ptx.size(); ++n)
for (size_t idx: txs.m_ptx[n].construction_data.selected_transfers)
m_transfers[idx].m_multisig_k.clear();
memwipe(m_transfers[idx].m_multisig_k.data(), m_transfers[idx].m_multisig_k.size() * sizeof(m_transfers[idx].m_multisig_k[0]));
// zero out some data we don't want to share
for (auto &ptx: txs.m_ptx)
{
for (auto &e: ptx.construction_data.sources)
e.multisig_kLRki.k = rct::zero();
memwipe(&e.multisig_kLRki.k, sizeof(e.multisig_kLRki.k));
}
for (auto &ptx: txs.m_ptx)
@ -7067,10 +7068,12 @@ bool wallet2::sign_multisig_tx(multisig_tx_set &exported_txs, std::vector<crypto
ptx.tx.rct_signatures = sig.sigs;
rct::keyV k;
rct::key skey = rct::zero();
auto wiper = epee::misc_utils::create_scope_leave_handler([&](){ memwipe(k.data(), k.size() * sizeof(k[0])); memwipe(&skey, sizeof(skey)); });
for (size_t idx: sd.selected_transfers)
k.push_back(get_multisig_k(idx, sig.used_L));
rct::key skey = rct::zero();
for (const auto &msk: get_account().get_multisig_keys())
{
crypto::public_key pmsk = get_multisig_signing_public_key(msk);
@ -7118,7 +7121,7 @@ bool wallet2::sign_multisig_tx(multisig_tx_set &exported_txs, std::vector<crypto
// txes generated, get rid of used k values
for (size_t n = 0; n < exported_txs.m_ptx.size(); ++n)
for (size_t idx: exported_txs.m_ptx[n].construction_data.selected_transfers)
m_transfers[idx].m_multisig_k.clear();
memwipe(m_transfers[idx].m_multisig_k.data(), m_transfers[idx].m_multisig_k.size() * sizeof(m_transfers[idx].m_multisig_k[0]));
exported_txs.m_signers.insert(get_multisig_signer_public_key());
@ -12868,7 +12871,7 @@ cryptonote::blobdata wallet2::export_multisig()
{
transfer_details &td = m_transfers[n];
crypto::key_image ki;
td.m_multisig_k.clear();
memwipe(td.m_multisig_k.data(), td.m_multisig_k.size() * sizeof(td.m_multisig_k[0]));
info[n].m_LR.clear();
info[n].m_partial_key_images.clear();
@ -12977,6 +12980,7 @@ size_t wallet2::import_multisig(std::vector<cryptonote::blobdata> blobs)
CHECK_AND_ASSERT_THROW_MES(info.size() + 1 <= m_multisig_signers.size() && info.size() + 1 >= m_multisig_threshold, "Wrong number of multisig sources");
std::vector<std::vector<rct::key>> k;
auto wiper = epee::misc_utils::create_scope_leave_handler([&](){memwipe(k.data(), k.size() * sizeof(k[0]));});
k.reserve(m_transfers.size());
for (const auto &td: m_transfers)
k.push_back(td.m_multisig_k);