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integrate simple rct api

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moneromooo-monero 2016-07-10 12:57:22 +01:00
parent 1e8d37e7d8
commit a4d4d6194b
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GPG key ID: 686F07454D6CEFC3
11 changed files with 400 additions and 188 deletions
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224
src/cryptonote_core/blockchain.cpp
View file

@ -2462,95 +2462,193 @@ bool Blockchain::check_tx_inputs(const transaction& tx, tx_verification_context
else
{
// from version 2, check ringct signatures
rct::ctkeyM reconstructed_mixRing;
rct::keyV reconstructed_II;
// if the tx already has a non empty mixRing and/or II, use them,
// else reconstruct them
const rct::ctkeyM &mixRing = tx.rct_signatures.mixRing.empty() ? reconstructed_mixRing : tx.rct_signatures.mixRing;
const rct::keyV &II = tx.rct_signatures.MG.II.size() == 1 ? reconstructed_II : tx.rct_signatures.MG.II;
// RCT needs the same mixin for all inputs
for (size_t n = 1; n < pubkeys.size(); ++n)
// obviously, the original and simple rct APIs use a mixRing that's indexes
// in opposite orders, because it'd be too simple otherwise...
if (tx.rct_signatures.simple)
{
if (pubkeys[n].size() != pubkeys[0].size())
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched ring sizes");
return false;
}
}
rct::ctkeyM reconstructed_mixRing;
std::vector<rct::keyV> reconstructed_II;
if (tx.rct_signatures.mixRing.empty())
{
reconstructed_mixRing.resize(pubkeys[0].size());
for (size_t n = 0; n < pubkeys.size(); ++n)
// if the tx already has a non empty mixRing, use them,
// else reconstruct them
const rct::ctkeyM &mixRing = tx.rct_signatures.mixRing.empty() ? reconstructed_mixRing : tx.rct_signatures.mixRing;
// always do II, because it's split in the simple version
// all MGs should have the same II size (1)
for (size_t n = 0; n < tx.rct_signatures.MGs.size(); ++n)
{
for (size_t m = 0; m < pubkeys[n].size(); ++m)
if (tx.rct_signatures.MGs[n].II.size() != 1)
{
reconstructed_mixRing[m].push_back(pubkeys[n][m]);
LOG_PRINT_L1("Failed to check ringct signatures: mismatched MGs II sizes");
return false;
}
}
}
if (tx.rct_signatures.MG.II.size() == 1)
{
reconstructed_II.resize(tx.vin.size());
for (size_t n = 0; n < tx.vin.size(); ++n)
{
reconstructed_II[n] = rct::ki2rct(boost::get<txin_to_key>(tx.vin[n]).k_image);
}
reconstructed_II.push_back(tx.rct_signatures.MG.II.back());
}
// check all this, either recontructed (so should really pass), or not
{
bool size_matches = true;
for (size_t i = 0; i < pubkeys.size(); ++i)
size_matches &= pubkeys[i].size() == mixRing.size();
for (size_t i = 0; i < tx.rct_signatures.mixRing.size(); ++i)
size_matches &= pubkeys.size() == mixRing[i].size();
if (!size_matches)
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched pubkeys/mixRing size");
return false;
reconstructed_II[n].push_back(rct::ki2rct(boost::get<txin_to_key>(tx.vin[n]).k_image));
reconstructed_II[n].push_back(tx.rct_signatures.MGs[n].II[0]);
}
for (size_t n = 0; n < pubkeys.size(); ++n)
if (tx.rct_signatures.mixRing.empty())
{
for (size_t m = 0; m < pubkeys[n].size(); ++m)
reconstructed_mixRing.resize(pubkeys.size());
for (size_t n = 0; n < pubkeys.size(); ++n)
{
if (pubkeys[n][m].dest != rct::rct2pk(mixRing[m][n].dest))
for (size_t m = 0; m < pubkeys[n].size(); ++m)
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched pubkey at vin " << n << ", index " << m);
return false;
}
if (pubkeys[n][m].mask != rct::rct2pk(mixRing[m][n].mask))
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched commitment at vin " << n << ", index " << m);
return false;
reconstructed_mixRing[n].push_back(pubkeys[n][m]);
}
}
}
}
if (II.size() != 1 + tx.vin.size())
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched II/vin sizes");
return false;
// check all this, either recontructed (so should really pass), or not
{
if (pubkeys.size() != mixRing.size())
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched pubkeys/mixRing size");
return false;
}
for (size_t i = 0; i < pubkeys.size(); ++i)
{
if (pubkeys[i].size() != mixRing[i].size())
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched pubkeys/mixRing size");
return false;
}
}
for (size_t n = 0; n < pubkeys.size(); ++n)
{
for (size_t m = 0; m < pubkeys[n].size(); ++m)
{
if (pubkeys[n][m].dest != rct::rct2pk(mixRing[n][m].dest))
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched pubkey at vin " << n << ", index " << m);
return false;
}
if (pubkeys[n][m].mask != rct::rct2pk(mixRing[n][m].mask))
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched commitment at vin " << n << ", index " << m);
return false;
}
}
}
}
if (tx.rct_signatures.MGs.size() != tx.vin.size())
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched MGs/vin sizes");
return false;
}
for (size_t n = 0; n < tx.vin.size(); ++n)
{
if (memcmp(&boost::get<txin_to_key>(tx.vin[n]).k_image, &reconstructed_II[n][0], 32))
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched key image");
return false;
}
}
if (!rct::verRctSimple(tx.rct_signatures, mixRing, &reconstructed_II, rct::hash2rct(tx_prefix_hash)))
{
LOG_PRINT_L1("Failed to check ringct signatures!");
return false;
}
}
for (size_t n = 0; n < tx.vin.size(); ++n)
else
{
if (memcmp(&boost::get<txin_to_key>(tx.vin[n]).k_image, &II[n], 32))
rct::ctkeyM reconstructed_mixRing;
rct::keyV reconstructed_II;
// if the tx already has a non empty mixRing and/or II, use them,
// else reconstruct them
const rct::ctkeyM &mixRing = tx.rct_signatures.mixRing.empty() ? reconstructed_mixRing : tx.rct_signatures.mixRing;
const rct::keyV &II = tx.rct_signatures.MG.II.size() == 1 ? reconstructed_II : tx.rct_signatures.MG.II;
// RCT needs the same mixin for all inputs
for (size_t n = 1; n < pubkeys.size(); ++n)
{
if (pubkeys[n].size() != pubkeys[0].size())
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched ring sizes");
return false;
}
}
if (tx.rct_signatures.mixRing.empty())
{
reconstructed_mixRing.resize(pubkeys[0].size());
for (size_t n = 0; n < pubkeys.size(); ++n)
{
for (size_t m = 0; m < pubkeys[n].size(); ++m)
{
reconstructed_mixRing[m].push_back(pubkeys[n][m]);
}
}
}
if (tx.rct_signatures.MG.II.size() == 1)
{
reconstructed_II.resize(tx.vin.size());
for (size_t n = 0; n < tx.vin.size(); ++n)
{
reconstructed_II[n] = rct::ki2rct(boost::get<txin_to_key>(tx.vin[n]).k_image);
}
reconstructed_II.push_back(tx.rct_signatures.MG.II.back());
}
// check all this, either recontructed (so should really pass), or not
{
bool size_matches = true;
for (size_t i = 0; i < pubkeys.size(); ++i)
size_matches &= pubkeys[i].size() == mixRing.size();
for (size_t i = 0; i < tx.rct_signatures.mixRing.size(); ++i)
size_matches &= pubkeys.size() == mixRing[i].size();
if (!size_matches)
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched pubkeys/mixRing size");
return false;
}
for (size_t n = 0; n < pubkeys.size(); ++n)
{
for (size_t m = 0; m < pubkeys[n].size(); ++m)
{
if (pubkeys[n][m].dest != rct::rct2pk(mixRing[m][n].dest))
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched pubkey at vin " << n << ", index " << m);
return false;
}
if (pubkeys[n][m].mask != rct::rct2pk(mixRing[m][n].mask))
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched commitment at vin " << n << ", index " << m);
return false;
}
}
}
}
if (II.size() != 1 + tx.vin.size())
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched II/vin sizes");
return false;
}
}
for (size_t n = 0; n < tx.vin.size(); ++n)
{
if (memcmp(&boost::get<txin_to_key>(tx.vin[n]).k_image, &II[n], 32))
{
LOG_PRINT_L1("Failed to check ringct signatures: mismatched II/vin sizes");
return false;
}
}
if (!rct::verRct(tx.rct_signatures, mixRing, II, rct::hash2rct(tx_prefix_hash)))
{
LOG_PRINT_L1("Failed to check ringct signatures!");
return false;
if (!rct::verRct(tx.rct_signatures, mixRing, II, rct::hash2rct(tx_prefix_hash)))
{
LOG_PRINT_L1("Failed to check ringct signatures!");
return false;
}
}
}
return true;

12
src/cryptonote_core/cryptonote_basic.h
View file

@ -231,11 +231,19 @@ namespace cryptonote
else
{
FIELD(rct_signatures)
for (size_t i = 0; i < rct_signatures.mixRing.size(); ++i)
if (rct_signatures.simple)
{
if (rct_signatures.mixRing[i].size() != vin.size())
if (rct_signatures.mixRing.size() && rct_signatures.mixRing.size() != vin.size())
return false;
}
else
{
for (size_t i = 0; i < rct_signatures.mixRing.size(); ++i)
{
if (rct_signatures.mixRing[i].size() != vin.size())
return false;
}
}
}
END_SERIALIZE()

21
src/cryptonote_core/cryptonote_boost_serialization.h
View file

@ -224,23 +224,16 @@ namespace boost
template <class Archive>
inline void serialize(Archive &a, rct::rctSig &x, const boost::serialization::version_type ver)
{
a & x.rangeSigs;
a & x.MG;
// a & x.mixRing; mixRing is not serialized, as it can be reconstructed from the offsets
a & x.ecdhInfo;
a & x.outPk;
a & x.txnFee;
// a & x.bash_hash; bash_hash is not serialized, as it can be reconstructed from the tx data
}
template <class Archive>
inline void serialize(Archive &a, rct::sRctSig &x, const boost::serialization::version_type ver)
{
a & x.simple;
// a & x.message; message is not serialized, as it can be reconstructed from the tx data
a & x.rangeSigs;
a & x.MG;
if (x.simple)
a & x.MGs;
else
a & x.MG;
// a & x.mixRing; mixRing is not serialized, as it can be reconstructed from the offsets
a & x.pseudoOuts;
if (x.simple)
a & x.pseudoOuts;
a & x.ecdhInfo;
a & x.outPk;
a & x.txnFee;

86
src/cryptonote_core/cryptonote_format_utils.cpp
View file

@ -516,19 +516,6 @@ namespace cryptonote
};
std::vector<input_generation_context_data> in_contexts;
if (tx.version > 1)
{
// ringct requires all real inputs to be at the same index for all inputs // TODO
BOOST_FOREACH(const tx_source_entry& src_entr, sources)
{
if(src_entr.real_output != sources.begin()->real_output)
{
LOG_ERROR("All inputs must have the same index for ringct");
return false;
}
}
}
uint64_t summary_inputs_money = 0;
//fill inputs
BOOST_FOREACH(const tx_source_entry& src_entr, sources)
@ -641,24 +628,46 @@ namespace cryptonote
}
else
{
// enforce same mixin for all outputs
size_t n_total_outs = sources[0].outputs.size();
for (size_t i = 1; i < sources.size(); ++i) {
if (n_total_outs != sources[i].outputs.size()) {
LOG_ERROR("Ringct transaction has varying mixin");
return false;
bool all_rct_inputs = true;
size_t n_total_outs = sources[0].outputs.size(); // only for non-simple rct
BOOST_FOREACH(const tx_source_entry& src_entr, sources)
all_rct_inputs &= !(src_entr.mask == rct::identity());
bool use_simple_rct = all_rct_inputs;
if (!use_simple_rct)
{
// non simple ringct requires all real inputs to be at the same index for all inputs
BOOST_FOREACH(const tx_source_entry& src_entr, sources)
{
if(src_entr.real_output != sources.begin()->real_output)
{
LOG_ERROR("All inputs must have the same index for non-simple ringct");
return false;
}
}
// enforce same mixin for all outputs
for (size_t i = 1; i < sources.size(); ++i) {
if (n_total_outs != sources[i].outputs.size()) {
LOG_ERROR("Non-simple ringct transaction has varying mixin");
return false;
}
}
}
uint64_t amount_in = 0, amount_out = 0;
rct::ctkeyV inSk;
rct::ctkeyM mixRing(n_total_outs);
// mixRing indexing is done the other way round for simple
rct::ctkeyM mixRing(use_simple_rct ? sources.size() : n_total_outs);
rct::keyV destinations;
std::vector<uint64_t> amounts;
std::vector<uint64_t> inamounts, outamounts;
std::vector<unsigned int> index;
for (size_t i = 0; i < sources.size(); ++i)
{
rct::ctkey ctkey;
amount_in += sources[i].amount;
inamounts.push_back(sources[i].amount);
index.push_back(sources[i].real_output);
// inSk: (secret key, mask)
ctkey.dest = rct::sk2rct(in_contexts[i].in_ephemeral.sec);
ctkey.mask = sources[i].mask;
@ -669,21 +678,37 @@ namespace cryptonote
for (size_t i = 0; i < tx.vout.size(); ++i)
{
destinations.push_back(rct::pk2rct(boost::get<txout_to_key>(tx.vout[i].target).key));
amounts.push_back(tx.vout[i].amount);
outamounts.push_back(tx.vout[i].amount);
amount_out += tx.vout[i].amount;
}
for (size_t i = 0; i < n_total_outs; ++i) // same index assumption
if (use_simple_rct)
{
mixRing[i].resize(sources.size());
for (size_t n = 0; n < sources.size(); ++n)
// mixRing indexing is done the other way round for simple
for (size_t i = 0; i < sources.size(); ++i)
{
mixRing[i][n] = sources[n].outputs[i].second;
mixRing[i].resize(sources[i].outputs.size());
for (size_t n = 0; n < sources[i].outputs.size(); ++n)
{
mixRing[i][n] = sources[i].outputs[n].second;
}
}
}
else
{
for (size_t i = 0; i < n_total_outs; ++i) // same index assumption
{
mixRing[i].resize(sources.size());
for (size_t n = 0; n < sources.size(); ++n)
{
mixRing[i][n] = sources[n].outputs[i].second;
}
}
}
// fee
if (amount_in > amount_out)
amounts.push_back(amount_in - amount_out);
if (!use_simple_rct && amount_in > amount_out)
outamounts.push_back(amount_in - amount_out);
// zero out all amounts to mask rct outputs, real amounts are now encrypted
for (size_t i = 0; i < tx.vin.size(); ++i)
@ -696,7 +721,10 @@ namespace cryptonote
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
if (use_simple_rct)
tx.rct_signatures = rct::genRctSimple(rct::hash2rct(tx_prefix_hash), inSk, destinations, inamounts, outamounts, amount_in - amount_out, mixRing, index);
else
tx.rct_signatures = rct::genRct(rct::hash2rct(tx_prefix_hash), inSk, destinations, outamounts, mixRing, 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);
}

84
src/ringct/rctSigs.cpp
View file

@ -329,7 +329,7 @@ namespace rct {
// this shows that sum inputs = sum outputs
//Ver:
// verifies the above sig is created corretly
mgSig proveRctMG(const ctkeyM & pubs, const ctkeyV & inSk, const ctkeyV &outSk, const ctkeyV & outPk, unsigned int index, key txnFeeKey, const key &base_hash) {
mgSig proveRctMG(const key &message, const ctkeyM & pubs, const ctkeyV & inSk, const ctkeyV &outSk, const ctkeyV & outPk, unsigned int index, key txnFeeKey) {
mgSig mg;
//setup vars
size_t cols = pubs.size();
@ -374,9 +374,9 @@ namespace rct {
sc_sub(sk[rows].bytes, sk[rows].bytes, outSk[j].mask.bytes); //subtract output masks in last row..
}
ctkeyV signed_data = outPk;
signed_data.push_back(ctkey({base_hash, identity()}));
key message = cn_fast_hash(signed_data);
return MLSAG_Gen(message, M, sk, index);
signed_data.push_back(ctkey({message, identity()}));
key msg = cn_fast_hash(signed_data);
return MLSAG_Gen(msg, M, sk, index);
}
@ -415,7 +415,7 @@ namespace rct {
// this shows that sum inputs = sum outputs
//Ver:
// verifies the above sig is created corretly
bool verRctMG(mgSig mg, const keyV &II, const ctkeyM & pubs, const ctkeyV & outPk, key txnFeeKey, const key &base_hash) {
bool verRctMG(mgSig mg, const keyV &II, const ctkeyM & pubs, const ctkeyV & outPk, key txnFeeKey, const key &message) {
//setup vars
size_t cols = pubs.size();
CHECK_AND_ASSERT_MES(cols >= 1, false, "Empty pubs");
@ -447,11 +447,11 @@ namespace rct {
subKeys(M[i][rows], M[i][rows], txnFeeKey);
}
ctkeyV signed_data = outPk;
signed_data.push_back(ctkey({base_hash, identity()}));
key message = cn_fast_hash(signed_data);
signed_data.push_back(ctkey({message, identity()}));
key msg = cn_fast_hash(signed_data);
DP("message:");
DP(message);
return MLSAG_Ver(message, M, mg, II);
DP(msg);
return MLSAG_Ver(msg, M, mg, II);
}
//Ring-ct Simple MG sigs
@ -535,7 +535,7 @@ namespace rct {
// must know the destination private key to find the correct amount, else will return a random number
// Note: For txn fees, the last index in the amounts vector should contain that
// Thus the amounts vector will be "one" longer than the destinations vectort
rctSig genRct(const ctkeyV & inSk, const keyV & destinations, const vector<xmr_amount> amounts, const ctkeyM &mixRing, const key &base_hash, unsigned int index) {
rctSig genRct(const key &message, const ctkeyV & inSk, const keyV & destinations, const vector<xmr_amount> & amounts, const ctkeyM &mixRing, unsigned int index) {
CHECK_AND_ASSERT_THROW_MES(amounts.size() == destinations.size() || amounts.size() == destinations.size() + 1, "Different number of amounts/destinations");
CHECK_AND_ASSERT_THROW_MES(index < mixRing.size(), "Bad index into mixRing");
for (size_t n = 0; n < mixRing.size(); ++n) {
@ -543,6 +543,7 @@ namespace rct {
}
rctSig rv;
rv.simple = false;
rv.outPk.resize(destinations.size());
rv.rangeSigs.resize(destinations.size());
rv.ecdhInfo.resize(destinations.size());
@ -578,23 +579,22 @@ namespace rct {
key txnFeeKey = scalarmultH(d2h(rv.txnFee));
rv.mixRing = mixRing;
rv.base_hash = base_hash;
rv.MG = proveRctMG(rv.mixRing, inSk, outSk, rv.outPk, index, txnFeeKey, base_hash);
rv.message = message;
rv.MG = proveRctMG(message, rv.mixRing, inSk, outSk, rv.outPk, index, txnFeeKey);
return rv;
}
rctSig genRct(const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> amounts, const key &base_hash, const int mixin) {
rctSig genRct(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> & amounts, const int mixin) {
unsigned int index;
ctkeyM mixRing;
tie(mixRing, index) = populateFromBlockchain(inPk, mixin);
return genRct(inSk, destinations, amounts, mixRing, base_hash, index);
return genRct(message, inSk, destinations, amounts, mixRing, index);
}
//RCT simple
//for post-rct only
sRctSig genRctSimple(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> &inamounts, const vector<xmr_amount> &outamounts, xmr_amount txnFee, const ctkeyM & mixRing, const std::vector<unsigned int> & index) {
rctSig genRctSimple(const key &message, const ctkeyV & inSk, const keyV & destinations, const vector<xmr_amount> &inamounts, const vector<xmr_amount> &outamounts, xmr_amount txnFee, const ctkeyM & mixRing, const std::vector<unsigned int> & index) {
CHECK_AND_ASSERT_THROW_MES(inamounts.size() > 0, "Empty inamounts");
CHECK_AND_ASSERT_THROW_MES(inPk.size() == inSk.size(), "Different number of inPk/inSk");
CHECK_AND_ASSERT_THROW_MES(inamounts.size() == inSk.size(), "Different number of inamounts/inSk");
CHECK_AND_ASSERT_THROW_MES(outamounts.size() == destinations.size(), "Different number of amounts/destinations");
CHECK_AND_ASSERT_THROW_MES(index.size() == inSk.size(), "Different number of index/inSk");
@ -603,7 +603,8 @@ namespace rct {
CHECK_AND_ASSERT_THROW_MES(index[n] < mixRing[n].size(), "Bad index into mixRing");
}
sRctSig rv;
rctSig rv;
rv.simple = true;
rv.message = message;
rv.outPk.resize(destinations.size());
rv.rangeSigs.resize(destinations.size());
@ -637,24 +638,24 @@ namespace rct {
// key txnFeeKey = scalarmultH(d2h(rv.txnFee));
rv.mixRing = mixRing;
rv.pseudoOuts.resize(inamounts.size());
rv.MG.resize(inamounts.size());
rv.MGs.resize(inamounts.size());
key sumpouts = zero(); //sum pseudoOut masks
key a;
for (i = 0 ; i < inamounts.size() - 1; i++) {
skGen(a);
sc_add(sumpouts.bytes, a.bytes, sumpouts.bytes);
genC(rv.pseudoOuts[i], a, inamounts[i]);
rv.MG[i] = proveRctMGSimple(message, rv.mixRing[i], inSk[i], a, rv.pseudoOuts[i], index[i]);
rv.MGs[i] = proveRctMGSimple(message, rv.mixRing[i], inSk[i], a, rv.pseudoOuts[i], index[i]);
}
rv.mixRing = mixRing;
sc_sub(a.bytes, sumout.bytes, sumpouts.bytes);
genC(rv.pseudoOuts[i], a, inamounts[i]);
DP(rv.pseudoOuts[i]);
rv.MG[i] = proveRctMGSimple(message, rv.mixRing[i], inSk[i], a, rv.pseudoOuts[i], index[i]);
rv.MGs[i] = proveRctMGSimple(message, rv.mixRing[i], inSk[i], a, rv.pseudoOuts[i], index[i]);
return rv;
}
sRctSig genRctSimple(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> &inamounts, const vector<xmr_amount> &outamounts, xmr_amount txnFee, unsigned int mixin) {
rctSig genRctSimple(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> &inamounts, const vector<xmr_amount> &outamounts, xmr_amount txnFee, unsigned int mixin) {
std::vector<unsigned int> index;
index.resize(inPk.size());
ctkeyM mixRing;
@ -663,7 +664,7 @@ namespace rct {
mixRing[i].resize(mixin+1);
index[i] = populateFromBlockchainSimple(mixRing[i], inPk[i], mixin);
}
return genRctSimple(message, inSk, inPk, destinations, inamounts, outamounts, txnFee, mixRing, index);
return genRctSimple(message, inSk, destinations, inamounts, outamounts, txnFee, mixRing, index);
}
//RingCT protocol
@ -676,7 +677,8 @@ namespace rct {
//decodeRct: (c.f. http://eprint.iacr.org/2015/1098 section 5.1.1)
// uses the attached ecdh info to find the amounts represented by each output commitment
// must know the destination private key to find the correct amount, else will return a random number
bool verRct(const rctSig & rv, const ctkeyM &mixRing, const keyV &II, const key &base_hash) {
bool verRct(const rctSig & rv, const ctkeyM &mixRing, const keyV &II, const key &message) {
CHECK_AND_ASSERT_MES(!rv.simple, false, "verRct called on simple rctSig");
CHECK_AND_ASSERT_MES(rv.outPk.size() == rv.rangeSigs.size(), false, "Mismatched sizes of rv.outPk and rv.rangeSigs");
CHECK_AND_ASSERT_MES(rv.outPk.size() == rv.ecdhInfo.size(), false, "Mismatched sizes of rv.outPk and rv.ecdhInfo");
@ -694,7 +696,7 @@ namespace rct {
}
//compute txn fee
key txnFeeKey = scalarmultH(d2h(rv.txnFee));
bool mgVerd = verRctMG(rv.MG, II, mixRing, rv.outPk, txnFeeKey, base_hash);
bool mgVerd = verRctMG(rv.MG, II, mixRing, rv.outPk, txnFeeKey, message);
DP("mg sig verified?");
DP(mgVerd);
@ -706,19 +708,28 @@ namespace rct {
}
}
bool verRct(const rctSig & rv) {
return verRct(rv, rv.mixRing, rv.MG.II, rv.base_hash);
return verRct(rv, rv.mixRing, rv.MG.II, rv.message);
}
//ver RingCT simple
//assumes only post-rct style inputs (at least for max anonymity)
bool verRctSimple(const sRctSig & rv) {
bool verRctSimple(const rctSig & rv, const ctkeyM &mixRing, const std::vector<keyV> *II, const key &message) {
size_t i = 0;
bool rvb = true;
CHECK_AND_ASSERT_MES(rv.simple, false, "verRctSimple called on non simple rctSig");
CHECK_AND_ASSERT_MES(rv.outPk.size() == rv.rangeSigs.size(), false, "Mismatched sizes of rv.outPk and rv.rangeSigs");
CHECK_AND_ASSERT_MES(rv.outPk.size() == rv.ecdhInfo.size(), false, "Mismatched sizes of rv.outPk and rv.ecdhInfo");
CHECK_AND_ASSERT_MES(rv.pseudoOuts.size() == rv.MGs.size(), false, "Mismatched sizes of rv.pseudoOuts and rv.MGs");
CHECK_AND_ASSERT_MES(rv.pseudoOuts.size() == rv.mixRing.size(), false, "Mismatched sizes of rv.pseudoOuts and rv.MGs");
CHECK_AND_ASSERT_MES(rv.pseudoOuts.size() == mixRing.size(), false, "Mismatched sizes of rv.pseudoOuts and mixRing");
CHECK_AND_ASSERT_MES(!II || II->size() == mixRing.size(), false, "Mismatched II/mixRing size");
if (II)
{
for (size_t n = 0; n < II->size(); ++n)
{
CHECK_AND_ASSERT_MES((*II)[n].size() == 2, false, "Bad II size");
}
}
key sumOutpks = identity();
for (i = 0; i < rv.outPk.size(); i++) {
@ -733,8 +744,8 @@ namespace rct {
bool tmpb = false;
key sumPseudoOuts = identity();
for (i = 0 ; i < rv.mixRing.size() ; i++) {
tmpb = verRctMGSimple(rv.message, rv.MG[i], rv.MG[i].II, rv.mixRing[i], rv.pseudoOuts[i]);
for (i = 0 ; i < mixRing.size() ; i++) {
tmpb = verRctMGSimple(message, rv.MGs[i], II ? (*II)[i] : rv.MGs[i].II, mixRing[i], rv.pseudoOuts[i]);
addKeys(sumPseudoOuts, sumPseudoOuts, rv.pseudoOuts[i]);
DP(tmpb);
if (!tmpb) {
@ -755,6 +766,10 @@ namespace rct {
return (rvb && mgVerd);
}
bool verRctSimple(const rctSig & rv) {
return verRctSimple(rv, rv.mixRing, NULL, rv.message);
}
//RingCT protocol
//genRct:
// creates an rctSig with all data necessary to verify the rangeProofs and that the signer owns one of the
@ -766,6 +781,7 @@ namespace rct {
// uses the attached ecdh info to find the amounts represented by each output commitment
// must know the destination private key to find the correct amount, else will return a random number
xmr_amount decodeRct(const rctSig & rv, const key & sk, unsigned int i, key & mask) {
CHECK_AND_ASSERT_MES(!rv.simple, false, "decodeRct called on simple rctSig");
CHECK_AND_ASSERT_THROW_MES(rv.rangeSigs.size() > 0, "Empty rv.rangeSigs");
CHECK_AND_ASSERT_THROW_MES(rv.outPk.size() == rv.rangeSigs.size(), "Mismatched sizes of rv.outPk and rv.rangeSigs");
CHECK_AND_ASSERT_THROW_MES(i < rv.ecdhInfo.size(), "Bad index");
@ -793,7 +809,8 @@ namespace rct {
return decodeRct(rv, sk, i, mask);
}
xmr_amount decodeRct(const sRctSig & rv, const key & sk, unsigned int i) {
xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i, key &mask) {
CHECK_AND_ASSERT_MES(rv.simple, false, "decodeRct called on non simple rctSig");
CHECK_AND_ASSERT_THROW_MES(rv.rangeSigs.size() > 0, "Empty rv.rangeSigs");
CHECK_AND_ASSERT_THROW_MES(rv.outPk.size() == rv.rangeSigs.size(), "Mismatched sizes of rv.outPk and rv.rangeSigs");
CHECK_AND_ASSERT_THROW_MES(i < rv.ecdhInfo.size(), "Bad index");
@ -801,7 +818,7 @@ namespace rct {
//mask amount and mask
ecdhTuple ecdh_info = rv.ecdhInfo[i];
ecdhDecode(ecdh_info, sk);
key mask = ecdh_info.mask;
mask = ecdh_info.mask;
key amount = ecdh_info.amount;
key C = rv.outPk[i].mask;
DP("C");
@ -815,4 +832,9 @@ namespace rct {
}
return h2d(amount);
}
xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i) {
key mask;
return decodeRctSimple(rv, sk, i, mask);
}
}

20
src/ringct/rctSigs.h
View file

@ -112,9 +112,9 @@ namespace rct {
// this shows that sum inputs = sum outputs
//Ver:
// verifies the above sig is created corretly
mgSig proveRctMG(const ctkeyM & pubs, const ctkeyV & inSk, const keyV &outMasks, const ctkeyV & outPk, unsigned int index, key txnFee, const key &base_hash);
mgSig proveRctMG(const ctkeyM & pubs, const ctkeyV & inSk, const keyV &outMasks, const ctkeyV & outPk, unsigned int index, key txnFee, const key &message);
mgSig proveRctMGSimple(const key & message, const ctkeyV & pubs, const ctkey & inSk, const key &a , const key &Cout, unsigned int index);
bool verRctMG(mgSig mg, const ctkeyM & pubs, const ctkeyV & outPk, key txnFee, const key &base_hash);
bool verRctMG(mgSig mg, const ctkeyM & pubs, const ctkeyV & outPk, key txnFee, const key &message);
bool verRctMGSimple(const key &message, const mgSig &mg, const keyV &II, const ctkeyV & pubs, const key & C);
//These functions get keys from blockchain
@ -135,16 +135,18 @@ namespace rct {
//decodeRct: (c.f. http://eprint.iacr.org/2015/1098 section 5.1.1)
// uses the attached ecdh info to find the amounts represented by each output commitment
// must know the destination private key to find the correct amount, else will return a random number
rctSig genRct(const ctkeyV & inSk, const keyV & destinations, const vector<xmr_amount> amounts, const ctkeyM &mixRing, const key &bash_hash, unsigned int index);
rctSig genRct(const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> amounts, const key &bash_hash, const int mixin);
sRctSig genRctSimple(const key & message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> & inamounts, const vector<xmr_amount> & outamounts, xmr_amount txnFee, unsigned int mixin);
sRctSig genRctSimple(const key & message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> & inamounts, const vector<xmr_amount> & outamounts, xmr_amount txnFee, const ctkeyM & mixRing, const std::vector<unsigned int> & index);
rctSig genRct(const key &message, const ctkeyV & inSk, const keyV & destinations, const vector<xmr_amount> & amounts, const ctkeyM &mixRing, unsigned int index);
rctSig genRct(const key &message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> & amounts, const int mixin);
rctSig genRctSimple(const key & message, const ctkeyV & inSk, const ctkeyV & inPk, const keyV & destinations, const vector<xmr_amount> & inamounts, const vector<xmr_amount> & outamounts, xmr_amount txnFee, unsigned int mixin);
rctSig genRctSimple(const key & message, const ctkeyV & inSk, const keyV & destinations, const vector<xmr_amount> & inamounts, const vector<xmr_amount> & outamounts, xmr_amount txnFee, const ctkeyM & mixRing, const std::vector<unsigned int> & index);
bool verRct(const rctSig & rv);
bool verRct(const rctSig & rv, const ctkeyM &mixRing, const keyV &II, const key &base_hash);
bool verRctSimple(const sRctSig & rv);
bool verRct(const rctSig & rv, const ctkeyM &mixRing, const keyV &II, const key &message);
bool verRctSimple(const rctSig & rv);
bool verRctSimple(const rctSig & rv, const ctkeyM &mixRing, const std::vector<keyV> *II, const key &message);
xmr_amount decodeRct(const rctSig & rv, const key & sk, unsigned int i, key & mask);
xmr_amount decodeRct(const rctSig & rv, const key & sk, unsigned int i);
xmr_amount decodeRct(const sRctSig & rv, const key & sk, unsigned int i);
xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i);
xmr_amount decodeRctSimple(const rctSig & rv, const key & sk, unsigned int i, key & mask);
}
#endif /* RCTSIGS_H */

39
src/ringct/rctTypes.h
View file

@ -183,44 +183,29 @@ namespace rct {
// outPk contains public keypairs which are destinations (P, C),
// P = address, C = commitment to amount
struct rctSig {
vector<rangeSig> rangeSigs;
mgSig MG;
ctkeyM mixRing; //the set of all pubkeys / copy
//pairs that you mix with
vector<ecdhTuple> ecdhInfo;
ctkeyV outPk;
xmr_amount txnFee;
key base_hash;
BEGIN_SERIALIZE_OBJECT()
FIELD(rangeSigs)
FIELD(MG)
// FIELD(mixRing) - not serialized, it can be reconstructed
FIELD(ecdhInfo)
FIELD(outPk)
FIELD(txnFee)
// FIELD(base_hash) - not serialized, it can be reconstructed
END_SERIALIZE()
};
//rct simple variant
struct sRctSig {
bool simple;
key message;
vector<rangeSig> rangeSigs;
vector<mgSig> MG;
vector<ctkeyV> mixRing; //the set of all pubkeys / copy
mgSig MG; // for non simple rct
vector<mgSig> MGs; // for simple rct
ctkeyM mixRing; //the set of all pubkeys / copy
//pairs that you mix with
keyV pseudoOuts; //C
keyV pseudoOuts; //C - for simple rct
vector<ecdhTuple> ecdhInfo;
ctkeyV outPk;
xmr_amount txnFee; // contains b
BEGIN_SERIALIZE_OBJECT()
FIELD(simple)
// FIELD(message) - not serialized, it can be reconstructed
FIELD(rangeSigs)
FIELD(MG)
if (simple)
FIELD(MGs)
else
FIELD(MG)
// FIELD(mixRing) - not serialized, it can be reconstructed
FIELD(pseudoOuts)
if (simple)
FIELD(pseudoOuts)
FIELD(ecdhInfo)
FIELD(outPk)
FIELD(txnFee)

30
src/wallet/wallet2.cpp
View file

@ -193,6 +193,14 @@ void wallet2::check_acc_out(const account_keys &acc, const tx_out &o, const cryp
error = false;
}
//----------------------------------------------------------------------------------------------------
static uint64_t decodeRct(const rct::rctSig & rv, const rct::key & sk, unsigned int i, rct::key & mask)
{
if (rv.simple)
return rct::decodeRctSimple(rv, sk, i, mask);
else
return rct::decodeRct(rv, sk, i, mask);
}
//----------------------------------------------------------------------------------------------------
void wallet2::process_new_transaction(const cryptonote::transaction& tx, uint64_t height, uint64_t ts, bool miner_tx, bool pool)
{
if (!miner_tx)
@ -251,7 +259,7 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, uint64_
outs.push_back(0);
if (money_transfered == 0)
money_transfered = rct::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[0].sec), 0, mask[0]);
money_transfered = tools::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[0].sec), 0, mask[0]);
amount[0] = money_transfered;
tx_money_got_in_outs = money_transfered;
@ -290,7 +298,7 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, uint64_
outs.push_back(i);
if (money_transfered[i] == 0)
money_transfered[i] = rct::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[i].sec), i, mask[i]);
money_transfered[i] = tools::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[i].sec), i, mask[i]);
tx_money_got_in_outs += money_transfered[i];
amount[i] = money_transfered[i];
}
@ -334,7 +342,7 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, uint64_
outs.push_back(i);
if (money_transfered[i] == 0)
money_transfered[i] = rct::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[i].sec), i, mask[i]);
money_transfered[i] = tools::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[i].sec), i, mask[i]);
tx_money_got_in_outs += money_transfered[i];
amount[i] = money_transfered[i];
}
@ -362,7 +370,7 @@ void wallet2::process_new_transaction(const cryptonote::transaction& tx, uint64_
outs.push_back(i);
if (money_transfered == 0)
money_transfered = rct::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[i].sec), i, mask[i]);
money_transfered = tools::decodeRct(tx.rct_signatures, rct::sk2rct(in_ephemeral[i].sec), i, mask[i]);
amount[i] = money_transfered;
tx_money_got_in_outs += money_transfered;
}
@ -3008,19 +3016,29 @@ static size_t estimate_rct_tx_size(int n_inputs, int mixin, int n_outputs)
// rct signatures
// simple
size += 1;
// message
size += 32;
// rangeSigs
size += (2*64*32+32+64*32) * n_outputs;
// MG - only the last slot of II is saved, the rest can be reconstructed
size += 32 * (mixin+1) * n_inputs + 32 + 32 * (/*n_inputs+*/1) ;
// MGs - only the last slot of II is saved, the rest can be reconstructed
size += n_inputs * (32 * (mixin+1) * n_inputs + 32 + 32 * (/*n_inputs+*/1));
// mixRing - not serialized, can be reconstructed
/* size += 2 * 32 * (mixin+1) * n_inputs; */
// pseudoOuts
size += 32 * n_outputs;
// ecdhInfo
size += 3 * 32 * n_outputs;
// outPk
size += 2 * 32 * n_outputs;
// txnFee
size += 4;
LOG_PRINT_L2("estimated rct tx size for " << n_inputs << " at mixin " << mixin << " and " << n_outputs << ": " << size << " (" << (32 * n_inputs + 2 * 32 * (mixin+1) * n_inputs) << " saved)");
return size;

5
tests/core_tests/rct.cpp
View file

@ -127,7 +127,10 @@ bool gen_rct_tx_validation_base::generate_with(std::vector<test_event_entry>& ev
cryptonote::keypair in_ephemeral;
crypto::key_image ki;
cryptonote::generate_key_image_helper(miner_accounts[n].get_keys(), tx_pub_key, o, in_ephemeral, ki);
rct::decodeRct(rct_txes[n].rct_signatures, rct::sk2rct(in_ephemeral.sec), o, rct_tx_masks[o+n*4]);
if (rct_txes[n].rct_signatures.simple)
rct::decodeRctSimple(rct_txes[n].rct_signatures, rct::sk2rct(in_ephemeral.sec), o, rct_tx_masks[o+n*4]);
else
rct::decodeRct(rct_txes[n].rct_signatures, rct::sk2rct(in_ephemeral.sec), o, rct_tx_masks[o+n*4]);
}
CHECK_AND_ASSERT_MES(generator.construct_block_manually(blk_txes[n], blk_last, miner_account,

64
tests/unit_tests/ringct.cpp
View file

@ -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, rct::zero(), 3);
rctSig s = genRct(rct::zero(), sc, pc, destinations, amounts, 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, rct::zero(), 3);
s = genRct(rct::zero(), sc, pc, destinations, amounts, 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, rct::zero(), 3);
rctSig s = genRct(rct::zero(), sc, pc, destinations, amounts, 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, rct::zero(), 3);
s = genRct(rct::zero(), sc, pc, destinations, amounts, 3);
//verify rct data
ASSERT_FALSE(verRct(s));
@ -274,6 +274,60 @@ TEST(ringct, range_proofs_with_fee)
ASSERT_TRUE(decodeRct(s, Sk, 1));
}
TEST(ringct, simple)
{
ctkeyV sc, pc;
ctkey sctmp, pctmp;
//this vector corresponds to output amounts
vector<xmr_amount>outamounts;
//this vector corresponds to input amounts
vector<xmr_amount>inamounts;
//this keyV corresponds to destination pubkeys
keyV destinations;
//add fake input 3000
//the sc is secret data
//pc is public data
tie(sctmp, pctmp) = ctskpkGen(3000);
sc.push_back(sctmp);
pc.push_back(pctmp);
inamounts.push_back(3000);
//add fake input 3000
//the sc is secret data
//pc is public data
tie(sctmp, pctmp) = ctskpkGen(3000);
sc.push_back(sctmp);
pc.push_back(pctmp);
inamounts.push_back(3000);
//add output 5000
outamounts.push_back(5000);
//add the corresponding destination pubkey
key Sk, Pk;
skpkGen(Sk, Pk);
destinations.push_back(Pk);
//add output 999
outamounts.push_back(999);
//add the corresponding destination pubkey
skpkGen(Sk, Pk);
destinations.push_back(Pk);
key message = skGen(); //real message later (hash of txn..)
//compute sig with mixin 2
xmr_amount txnfee = 1;
rctSig s = genRctSimple(message, sc, pc, destinations,inamounts, outamounts, txnfee, 2);
//verify ring ct signature
ASSERT_TRUE(verRctSimple(s));
//decode received amount corresponding to output pubkey index 1
ASSERT_TRUE(decodeRctSimple(s, Sk, 1));
}
static rct::rctSig make_sample_rct_sig(int n_inputs, const uint64_t input_amounts[], int n_outputs, const uint64_t output_amounts[], bool last_is_fee)
{
ctkeyV sc, pc;
@ -295,7 +349,7 @@ 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, rct::zero(), 3);;
return genRct(rct::zero(), sc, pc, destinations, amounts, 3);;
}
static bool range_proof_test(bool expected_valid,

3
tests/unit_tests/serialization.cpp
View file

@ -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, rct::zero(), 3);
s0 = rct::genRct(rct::zero(), sc, pc, destinations, amounts, 3);
mg0 = s0.MG;
ASSERT_TRUE(serialization::dump_binary(mg0, blob));
@ -588,6 +588,7 @@ TEST(Serialization, serializes_ringct_types)
ASSERT_TRUE(serialization::dump_binary(s0, blob));
ASSERT_TRUE(serialization::parse_binary(blob, s1));
ASSERT_TRUE(s0.simple == s1.simple);
ASSERT_TRUE(s0.rangeSigs.size() == s1.rangeSigs.size());
for (size_t n = 0; n < s0.rangeSigs.size(); ++n)
{