Refactor SaplingNotePlaintext::decrypt
Break up plaintext decryption into height-dependent and non-height-dependent parts.
This commit is contained in:
parent
3c8e970358
commit
6402c589c6
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@ -3769,8 +3769,9 @@ UniValue z_viewtransaction(const UniValue& params, bool fHelp)
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auto op = res->second;
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auto wtxPrev = pwalletMain->mapWallet.at(op.hash);
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// TODO: decide which height to use here instead of wtxPrev.nExpiryHeight
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auto decrypted = wtxPrev.DecryptSaplingNote(Params().GetConsensus(), wtxPrev.nExpiryHeight, op).get();
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// We don't need to check the leadbyte here: if wtx exists in
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// the wallet, it must have already passed the leadbyte check
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auto decrypted = wtxPrev.DecryptSaplingNoteWithoutLeadByteCheck(op).get();
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auto notePt = decrypted.first;
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auto pa = decrypted.second;
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@ -3798,16 +3799,16 @@ UniValue z_viewtransaction(const UniValue& params, bool fHelp)
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SaplingPaymentAddress pa;
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bool isOutgoing;
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// TODO: decide which height to use here instead of wtx.nExpiryHeight
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auto decrypted = wtx.DecryptSaplingNote(Params().GetConsensus(), wtx.nExpiryHeight, op);
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// We don't need to check the leadbyte here: if wtx exists in
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// the wallet, it must have already passed the leadbyte check
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auto decrypted = wtx.DecryptSaplingNoteWithoutLeadByteCheck(op);
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if (decrypted) {
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notePt = decrypted->first;
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pa = decrypted->second;
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isOutgoing = false;
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} else {
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// Try recovering the output
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// TODO: decide which height to use here instead of wtxPrev.nExpiryHeight
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auto recovered = wtx.RecoverSaplingNote(Params().GetConsensus(), wtx.nExpiryHeight, op, ovks);
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auto recovered = wtx.RecoverSaplingNoteWithoutLeadByteCheck(op, ovks);
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if (recovered) {
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notePt = recovered->first;
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pa = recovered->second;
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@ -1496,8 +1496,15 @@ void CWallet::UpdateSaplingNullifierNoteMapWithTx(CWalletTx& wtx) {
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auto extfvk = mapSaplingFullViewingKeys.at(nd.ivk);
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OutputDescription output = wtx.vShieldedOutput[op.n];
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// TODO: decide which height to use here instead of wtx.nExpiryHeight
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auto optPlaintext = SaplingNotePlaintext::decrypt(Params().GetConsensus(), wtx.nExpiryHeight, output.encCiphertext, nd.ivk, output.ephemeralKey, output.cmu);
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auto optDeserialized = SaplingNotePlaintext::attempt_sapling_enc_decryption_deserialization(output.encCiphertext, nd.ivk, output.ephemeralKey);
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if (!optDeserialized) {
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// The transaction would not have entered the wallet unless
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// its plaintest had been succesfully decrypted previously.
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assert(false);
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}
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auto optPlaintext = SaplingNotePlaintext::plaintext_checks_without_height(*optDeserialized, nd.ivk, output.ephemeralKey, output.cmu);
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if (!optPlaintext) {
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// An item in mapSaplingNoteData must have already been successfully decrypted,
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// otherwise the item would not exist in the first place.
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@ -1716,7 +1723,7 @@ bool CWallet::AddToWalletIfInvolvingMe(const CTransaction& tx, const CBlock* pbl
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bool fExisted = mapWallet.count(tx.GetHash()) != 0;
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if (fExisted && !fUpdate) return false;
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auto sproutNoteData = FindMySproutNotes(tx);
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auto saplingNoteDataAndAddressesToAdd = FindMySaplingNotes(tx);
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auto saplingNoteDataAndAddressesToAdd = FindMySaplingNotes(tx, chainActive.Height());
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auto saplingNoteData = saplingNoteDataAndAddressesToAdd.first;
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auto addressesToAdd = saplingNoteDataAndAddressesToAdd.second;
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for (const auto &addressToAdd : addressesToAdd) {
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@ -1890,7 +1897,7 @@ mapSproutNoteData_t CWallet::FindMySproutNotes(const CTransaction &tx) const
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* the result of FindMySaplingNotes (for the addresses available at the time) will
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* already have been cached in CWalletTx.mapSaplingNoteData.
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*/
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std::pair<mapSaplingNoteData_t, SaplingIncomingViewingKeyMap> CWallet::FindMySaplingNotes(const CTransaction &tx) const
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std::pair<mapSaplingNoteData_t, SaplingIncomingViewingKeyMap> CWallet::FindMySaplingNotes(const CTransaction &tx, int height) const
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{
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LOCK(cs_KeyStore);
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uint256 hash = tx.GetHash();
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@ -1904,8 +1911,7 @@ std::pair<mapSaplingNoteData_t, SaplingIncomingViewingKeyMap> CWallet::FindMySap
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for (auto it = mapSaplingFullViewingKeys.begin(); it != mapSaplingFullViewingKeys.end(); ++it) {
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SaplingIncomingViewingKey ivk = it->first;
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// TODO: decide which height to use here instead of wtx.nExpiryHeight
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auto result = SaplingNotePlaintext::decrypt(Params().GetConsensus(), tx.nExpiryHeight, output.encCiphertext, ivk, output.ephemeralKey, output.cmu);
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auto result = SaplingNotePlaintext::decrypt(Params().GetConsensus(), height, output.encCiphertext, ivk, output.ephemeralKey, output.cmu);
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if (!result) {
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continue;
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}
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@ -2331,6 +2337,41 @@ boost::optional<std::pair<
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return std::make_pair(notePt, pa);
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}
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boost::optional<std::pair<
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SaplingNotePlaintext,
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SaplingPaymentAddress>> CWalletTx::DecryptSaplingNoteWithoutLeadByteCheck(SaplingOutPoint op) const
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{
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// Check whether we can decrypt this SaplingOutPoint
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if (this->mapSaplingNoteData.count(op) == 0) {
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return boost::none;
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}
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auto output = this->vShieldedOutput[op.n];
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auto nd = this->mapSaplingNoteData.at(op);
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auto optDeserialized = SaplingNotePlaintext::attempt_sapling_enc_decryption_deserialization(output.encCiphertext, nd.ivk, output.ephemeralKey);
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if (!optDeserialized) {
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// The transaction would not have entered the wallet unless
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// its plaintest had been succesfully decrypted previously.
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assert(false);
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}
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auto maybe_pt = SaplingNotePlaintext::plaintext_checks_without_height(
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*optDeserialized,
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nd.ivk,
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output.ephemeralKey,
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output.cmu);
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assert(static_cast<bool>(maybe_pt));
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auto notePt = maybe_pt.get();
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auto maybe_pa = nd.ivk.address(notePt.d);
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assert(static_cast<bool>(maybe_pa));
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auto pa = maybe_pa.get();
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return std::make_pair(notePt, pa);
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}
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boost::optional<std::pair<
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SaplingNotePlaintext,
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SaplingPaymentAddress>> CWalletTx::RecoverSaplingNote(const Consensus::Params& params, int height, SaplingOutPoint op, std::set<uint256>& ovks) const
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@ -2366,6 +2407,47 @@ boost::optional<std::pair<
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return boost::none;
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}
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boost::optional<std::pair<
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SaplingNotePlaintext,
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SaplingPaymentAddress>> CWalletTx::RecoverSaplingNoteWithoutLeadByteCheck(SaplingOutPoint op, std::set<uint256>& ovks) const
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{
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auto output = this->vShieldedOutput[op.n];
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for (auto ovk : ovks) {
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auto outPt = SaplingOutgoingPlaintext::decrypt(
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output.outCiphertext,
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ovk,
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output.cv,
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output.cmu,
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output.ephemeralKey);
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if (!outPt) {
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continue;
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}
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auto optDeserialized = SaplingNotePlaintext::attempt_sapling_enc_decryption_deserialization(output.encCiphertext, output.ephemeralKey, outPt->esk, outPt->pk_d);
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if (!optDeserialized) {
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// The transaction would not have entered the wallet unless
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// its plaintest had been succesfully decrypted previously.
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assert(false);
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}
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auto maybe_pt = SaplingNotePlaintext::plaintext_checks_without_height(
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*optDeserialized,
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output.ephemeralKey,
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outPt->esk,
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outPt->pk_d,
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output.cmu);
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assert(static_cast<bool>(maybe_pt));
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auto notePt = maybe_pt.get();
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return std::make_pair(notePt, SaplingPaymentAddress(notePt.d, outPt->pk_d));
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}
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// Couldn't recover with any of the provided OutgoingViewingKeys
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return boost::none;
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}
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int64_t CWalletTx::GetTxTime() const
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{
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int64_t n = nTimeSmart;
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@ -4982,11 +5064,17 @@ void CWallet::GetFilteredNotes(
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SaplingOutPoint op = pair.first;
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SaplingNoteData nd = pair.second;
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// TODO: decide which height to use here instead of wtx.nExpiryHeight
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auto maybe_pt = SaplingNotePlaintext::decrypt(
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Params().GetConsensus(),
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wtx.nExpiryHeight,
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wtx.vShieldedOutput[op.n].encCiphertext,
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auto optDeserialized = SaplingNotePlaintext::attempt_sapling_enc_decryption_deserialization(wtx.vShieldedOutput[op.n].encCiphertext, nd.ivk, wtx.vShieldedOutput[op.n].ephemeralKey);
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if (!optDeserialized) {
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// The transaction would not have entered the wallet unless
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// its plaintest had been succesfully decrypted previously.
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assert(false);
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}
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// We don't need to check the leadbyte here: if wtx exists in
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// the wallet, it must have already passed the leadbyte check
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auto maybe_pt = SaplingNotePlaintext::plaintext_checks_without_height(
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*optDeserialized,
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nd.ivk,
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wtx.vShieldedOutput[op.n].ephemeralKey,
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wtx.vShieldedOutput[op.n].cmu);
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@ -567,10 +567,16 @@ public:
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boost::optional<std::pair<
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libzcash::SaplingNotePlaintext,
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libzcash::SaplingPaymentAddress>> DecryptSaplingNote(const Consensus::Params& params, int height, SaplingOutPoint op) const;
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boost::optional<std::pair<
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libzcash::SaplingNotePlaintext,
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libzcash::SaplingPaymentAddress>> DecryptSaplingNoteWithoutLeadByteCheck(SaplingOutPoint op) const;
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boost::optional<std::pair<
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libzcash::SaplingNotePlaintext,
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libzcash::SaplingPaymentAddress>> RecoverSaplingNote(const Consensus::Params& params, int height,
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SaplingOutPoint op, std::set<uint256>& ovks) const;
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boost::optional<std::pair<
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libzcash::SaplingNotePlaintext,
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libzcash::SaplingPaymentAddress>> RecoverSaplingNoteWithoutLeadByteCheck(SaplingOutPoint op, std::set<uint256>& ovks) const;
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//! filter decides which addresses will count towards the debit
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CAmount GetDebit(const isminefilter& filter) const;
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@ -1221,7 +1227,7 @@ public:
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const uint256& hSig,
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uint8_t n) const;
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mapSproutNoteData_t FindMySproutNotes(const CTransaction& tx) const;
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std::pair<mapSaplingNoteData_t, SaplingIncomingViewingKeyMap> FindMySaplingNotes(const CTransaction& tx) const;
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std::pair<mapSaplingNoteData_t, SaplingIncomingViewingKeyMap> FindMySaplingNotes(const CTransaction& tx, int height) const;
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bool IsSproutNullifierFromMe(const uint256& nullifier) const;
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bool IsSaplingNullifierFromMe(const uint256& nullifier) const;
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@ -209,34 +209,40 @@ boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::decrypt(
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const uint256 &cmu
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)
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{
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auto pt = AttemptSaplingEncDecryption(ciphertext, ivk, epk);
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if (!pt) {
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return boost::none;
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}
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// Deserialize from the plaintext
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SaplingNotePlaintext ret;
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CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
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ss << pt.get();
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ss >> ret;
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assert(ss.size() == 0);
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// Check leadbyte is allowed at block height
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if (!plaintext_version_is_valid(params, height, ret.leadByte)) {
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auto ret = attempt_sapling_enc_decryption_deserialization(ciphertext, ivk, epk);
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if (!ret) {
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return boost::none;
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} else {
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const SaplingNotePlaintext plaintext = *ret;
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// Check leadbyte is allowed at block height
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if (!plaintext_version_is_valid(params, height, plaintext.leadByte)) {
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return boost::none;
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}
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return plaintext_checks_without_height(plaintext, ivk, epk, cmu);
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}
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}
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boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::plaintext_checks_without_height(
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const SaplingNotePlaintext &plaintext,
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const uint256 &ivk,
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const uint256 &epk,
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const uint256 &cmu
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)
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{
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uint256 pk_d;
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if (!librustzcash_ivk_to_pkd(ivk.begin(), ret.d.data(), pk_d.begin())) {
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if (!librustzcash_ivk_to_pkd(ivk.begin(), plaintext.d.data(), pk_d.begin())) {
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return boost::none;
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}
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uint256 cmu_expected;
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uint256 rcm = ret.rcm();
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uint256 rcm = plaintext.rcm();
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if (!librustzcash_sapling_compute_cm(
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ret.d.data(),
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plaintext.d.data(),
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pk_d.begin(),
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ret.value(),
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plaintext.value(),
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rcm.begin(),
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cmu_expected.begin()
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))
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@ -248,12 +254,12 @@ boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::decrypt(
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return boost::none;
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}
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if (ret.leadByte == 0x02) {
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if (plaintext.leadByte == 0x02) {
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// ZIP 212: Check that epk is consistent to prevent against linkability
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// attacks without relying on the soundness of the SNARK.
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uint256 expected_epk;
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uint256 esk = ret.generate_esk();
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if (!librustzcash_sapling_ka_derivepublic(ret.d.data(), esk.begin(), expected_epk.begin())) {
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uint256 esk = plaintext.generate_esk();
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if (!librustzcash_sapling_ka_derivepublic(plaintext.d.data(), esk.begin(), expected_epk.begin())) {
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return boost::none;
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}
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if (expected_epk != epk) {
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@ -261,7 +267,29 @@ boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::decrypt(
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}
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}
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return ret;
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return plaintext;
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}
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boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::attempt_sapling_enc_decryption_deserialization(
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const SaplingEncCiphertext &ciphertext,
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const uint256 &ivk,
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const uint256 &epk
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)
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{
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auto encPlaintext = AttemptSaplingEncDecryption(ciphertext, ivk, epk);
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if (!encPlaintext) {
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return boost::none;
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};
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// Deserialize from the plaintext
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SaplingNotePlaintext plaintext;
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CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
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ss << encPlaintext.get();
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ss >> plaintext;
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assert(ss.size() == 0);
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return plaintext;
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}
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boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::decrypt(
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@ -274,26 +302,33 @@ boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::decrypt(
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const uint256 &cmu
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)
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{
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auto pt = AttemptSaplingEncDecryption(ciphertext, epk, esk, pk_d);
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if (!pt) {
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return boost::none;
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}
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// Deserialize from the plaintext
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SaplingNotePlaintext ret;
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CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
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ss << pt.get();
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ss >> ret;
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assert(ss.size() == 0);
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// Check leadbyte is legible at block height
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if (!plaintext_version_is_valid(params, height, ret.leadByte)) {
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auto ret = attempt_sapling_enc_decryption_deserialization(ciphertext, epk, esk, pk_d);
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if (!ret) {
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return boost::none;
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} else {
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SaplingNotePlaintext plaintext = *ret;
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// Check leadbyte is allowed at block height
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if (!plaintext_version_is_valid(params, height, plaintext.leadByte)) {
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return boost::none;
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}
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return plaintext_checks_without_height(plaintext, epk, esk, pk_d, cmu);
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}
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}
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boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::plaintext_checks_without_height(
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const SaplingNotePlaintext &plaintext,
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const uint256 &epk,
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const uint256 &esk,
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const uint256 &pk_d,
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const uint256 &cmu
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)
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{
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// Check that epk is consistent with esk
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uint256 expected_epk;
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if (!librustzcash_sapling_ka_derivepublic(ret.d.data(), esk.begin(), expected_epk.begin())) {
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if (!librustzcash_sapling_ka_derivepublic(plaintext.d.data(), esk.begin(), expected_epk.begin())) {
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return boost::none;
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}
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if (expected_epk != epk) {
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@ -301,11 +336,11 @@ boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::decrypt(
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}
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uint256 cmu_expected;
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uint256 rcm = ret.rcm();
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uint256 rcm = plaintext.rcm();
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if (!librustzcash_sapling_compute_cm(
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ret.d.data(),
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plaintext.d.data(),
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pk_d.begin(),
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ret.value(),
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plaintext.value(),
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rcm.begin(),
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cmu_expected.begin()
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))
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@ -317,15 +352,38 @@ boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::decrypt(
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return boost::none;
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}
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if (ret.leadByte == 0x02) {
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if (plaintext.leadByte == 0x02) {
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// ZIP 212: Additionally check that the esk provided to this function
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// is consistent with the esk we can derive
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if (esk != ret.generate_esk()) {
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if (esk != plaintext.generate_esk()) {
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return boost::none;
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}
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}
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return ret;
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return plaintext;
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}
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boost::optional<SaplingNotePlaintext> SaplingNotePlaintext::attempt_sapling_enc_decryption_deserialization(
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const SaplingEncCiphertext &ciphertext,
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const uint256 &epk,
|
||||
const uint256 &esk,
|
||||
const uint256 &pk_d
|
||||
)
|
||||
{
|
||||
auto encPlaintext = AttemptSaplingEncDecryption(ciphertext, epk, esk, pk_d);
|
||||
|
||||
if (!encPlaintext) {
|
||||
return boost::none;
|
||||
};
|
||||
|
||||
// Deserialize from the plaintext
|
||||
SaplingNotePlaintext plaintext;
|
||||
CDataStream ss(SER_NETWORK, PROTOCOL_VERSION);
|
||||
ss << encPlaintext.get();
|
||||
ss >> plaintext;
|
||||
assert(ss.size() == 0);
|
||||
|
||||
return plaintext;
|
||||
}
|
||||
|
||||
boost::optional<SaplingNotePlaintextEncryptionResult> SaplingNotePlaintext::encrypt(const uint256& pk_d) const
|
||||
|
|
|
@ -167,6 +167,19 @@ public:
|
|||
const uint256 &cmu
|
||||
);
|
||||
|
||||
static boost::optional<SaplingNotePlaintext> plaintext_checks_without_height(
|
||||
const SaplingNotePlaintext &plaintext,
|
||||
const uint256 &ivk,
|
||||
const uint256 &epk,
|
||||
const uint256 &cmu
|
||||
);
|
||||
|
||||
static boost::optional<SaplingNotePlaintext> attempt_sapling_enc_decryption_deserialization(
|
||||
const SaplingEncCiphertext &ciphertext,
|
||||
const uint256 &ivk,
|
||||
const uint256 &epk
|
||||
);
|
||||
|
||||
static boost::optional<SaplingNotePlaintext> decrypt(
|
||||
const Consensus::Params& params,
|
||||
int height,
|
||||
|
@ -177,6 +190,21 @@ public:
|
|||
const uint256 &cmu
|
||||
);
|
||||
|
||||
static boost::optional<SaplingNotePlaintext> plaintext_checks_without_height(
|
||||
const SaplingNotePlaintext &plaintext,
|
||||
const uint256 &epk,
|
||||
const uint256 &esk,
|
||||
const uint256 &pk_d,
|
||||
const uint256 &cmu
|
||||
);
|
||||
|
||||
static boost::optional<SaplingNotePlaintext> attempt_sapling_enc_decryption_deserialization(
|
||||
const SaplingEncCiphertext &ciphertext,
|
||||
const uint256 &epk,
|
||||
const uint256 &esk,
|
||||
const uint256 &pk_d
|
||||
);
|
||||
|
||||
boost::optional<SaplingNote> note(const SaplingIncomingViewingKey& ivk) const;
|
||||
|
||||
virtual ~SaplingNotePlaintext() {}
|
||||
|
|
|
@ -307,7 +307,7 @@ double benchmark_try_decrypt_sapling_notes(size_t nKeys)
|
|||
|
||||
struct timeval tv_start;
|
||||
timer_start(tv_start);
|
||||
auto noteDataMapAndAddressesToAdd = wallet.FindMySaplingNotes(tx);
|
||||
auto noteDataMapAndAddressesToAdd = wallet.FindMySaplingNotes(tx, 1);
|
||||
assert(noteDataMapAndAddressesToAdd.first.empty());
|
||||
return timer_stop(tv_start);
|
||||
}
|
||||
|
|
Loading…
Reference in New Issue