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rct: add the tx prefix hash into the MLSAG

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to protect the non-signatures parts of the tx from tampering.
This commit is contained in:
moneromooo-monero 2016-06-28 16:03:28 +01:00
parent 35dce5c70c
commit 6d0e47148b
No known key found for this signature in database
GPG Key ID: 686F07454D6CEFC3
6 changed files with 43 additions and 9 deletions
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7
src/cryptonote_core/cryptonote_format_utils.cpp
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@ -685,9 +685,6 @@ namespace cryptonote
if (amount_in > amount_out)
amounts.push_back(amount_in - amount_out);
LOG_PRINT_L1("Signing tx: " << obj_to_json_str(tx));
tx.rct_signatures = rct::genRct(inSk, destinations, amounts, mixRing, sources[0].real_output); // same index assumption
// zero out all amounts to mask rct outputs, real amounts are now encrypted
for (size_t i = 0; i < tx.vin.size(); ++i)
{
@ -697,6 +694,10 @@ namespace cryptonote
for (size_t i = 0; i < tx.vout.size(); ++i)
tx.vout[i].amount = 0;
crypto::hash tx_prefix_hash;
get_transaction_prefix_hash(tx, tx_prefix_hash);
tx.rct_signatures = rct::genRct(inSk, destinations, amounts, mixRing, rct::hash2rct(tx_prefix_hash), sources[0].real_output); // same index assumption
LOG_PRINT2("construct_tx.log", "transaction_created: " << get_transaction_hash(tx) << ENDL << obj_to_json_str(tx) << ENDL, LOG_LEVEL_3);
}

2
tests/core_tests/chaingen_main.cpp
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@ -199,6 +199,8 @@ int main(int argc, char* argv[])
GENERATE_AND_PLAY(gen_rct_tx_pre_rct_add_vout);
GENERATE_AND_PLAY(gen_rct_tx_rct_add_vout);
GENERATE_AND_PLAY(gen_rct_tx_pre_rct_increase_vin_and_fee);
GENERATE_AND_PLAY(gen_rct_tx_pre_rct_altered_extra);
GENERATE_AND_PLAY(gen_rct_tx_rct_altered_extra);
std::cout << (failed_tests.empty() ? concolor::green : concolor::magenta);
std::cout << "\nREPORT:\n";

18
tests/core_tests/rct.cpp
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@ -467,3 +467,21 @@ bool gen_rct_tx_rct_add_vout::generate(std::vector<test_event_entry>& events) co
NULL, [](transaction &tx) {tx.vout.push_back(tx.vout.back());});
}
bool gen_rct_tx_pre_rct_altered_extra::generate(std::vector<test_event_entry>& events) const
{
const int mixin = 2;
const int out_idx[] = {0, -1};
const uint64_t amount_paid = 10000;
return generate_with(events, out_idx, mixin, amount_paid, false,
NULL, [](transaction &tx) {std::string extra_nonce; crypto::hash pid = cryptonote::null_hash; set_payment_id_to_tx_extra_nonce(extra_nonce, pid); add_extra_nonce_to_tx_extra(tx.extra, extra_nonce);});
}
bool gen_rct_tx_rct_altered_extra::generate(std::vector<test_event_entry>& events) const
{
const int mixin = 2;
const int out_idx[] = {1, -1};
const uint64_t amount_paid = 10000;
return generate_with(events, out_idx, mixin, amount_paid, false,
NULL, [](transaction &tx) {std::string extra_nonce; crypto::hash pid = cryptonote::null_hash; set_payment_id_to_tx_extra_nonce(extra_nonce, pid); add_extra_nonce_to_tx_extra(tx.extra, extra_nonce);});
}

13
tests/core_tests/rct.h
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@ -249,3 +249,16 @@ struct gen_rct_tx_rct_add_vout : public gen_rct_tx_validation_base
};
template<> struct get_test_options<gen_rct_tx_rct_add_vout>: public get_test_options<gen_rct_tx_validation_base> {};
// extra
struct gen_rct_tx_pre_rct_altered_extra : public gen_rct_tx_validation_base
{
bool generate(std::vector<test_event_entry>& events) const;
};
template<> struct get_test_options<gen_rct_tx_pre_rct_altered_extra>: public get_test_options<gen_rct_tx_validation_base> {};
struct gen_rct_tx_rct_altered_extra : public gen_rct_tx_validation_base
{
bool generate(std::vector<test_event_entry>& events) const;
};
template<> struct get_test_options<gen_rct_tx_rct_altered_extra>: public get_test_options<gen_rct_tx_validation_base> {};

10
tests/unit_tests/ringct.cpp
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@ -187,7 +187,7 @@ TEST(ringct, range_proofs)
destinations.push_back(Pk);
//compute rct data with mixin 500
rctSig s = genRct(sc, pc, destinations, amounts, 3);
rctSig s = genRct(sc, pc, destinations, amounts, rct::zero(), 3);
//verify rct data
ASSERT_TRUE(verRct(s));
@ -204,7 +204,7 @@ TEST(ringct, range_proofs)
//compute rct data with mixin 500
s = genRct(sc, pc, destinations, amounts, 3);
s = genRct(sc, pc, destinations, amounts, rct::zero(), 3);
//verify rct data
ASSERT_FALSE(verRct(s));
@ -248,7 +248,7 @@ TEST(ringct, range_proofs_with_fee)
destinations.push_back(Pk);
//compute rct data with mixin 500
rctSig s = genRct(sc, pc, destinations, amounts, 3);
rctSig s = genRct(sc, pc, destinations, amounts, rct::zero(), 3);
//verify rct data
ASSERT_TRUE(verRct(s));
@ -265,7 +265,7 @@ TEST(ringct, range_proofs_with_fee)
//compute rct data with mixin 500
s = genRct(sc, pc, destinations, amounts, 3);
s = genRct(sc, pc, destinations, amounts, rct::zero(), 3);
//verify rct data
ASSERT_FALSE(verRct(s));
@ -295,7 +295,7 @@ static rct::rctSig make_sample_rct_sig(int n_inputs, const uint64_t input_amount
destinations.push_back(Pk);
}
return genRct(sc, pc, destinations, amounts, 3);;
return genRct(sc, pc, destinations, amounts, rct::zero(), 3);;
}
static bool range_proof_test(bool expected_valid,

2
tests/unit_tests/serialization.cpp
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@ -565,7 +565,7 @@ TEST(Serialization, serializes_ringct_types)
rct::skpkGen(Sk, Pk);
destinations.push_back(Pk);
//compute rct data with mixin 500
s0 = rct::genRct(sc, pc, destinations, amounts, 3);
s0 = rct::genRct(sc, pc, destinations, amounts, rct::zero(), 3);
mg0 = s0.MG;
ASSERT_TRUE(serialization::dump_binary(mg0, blob));