Auto merge of #3233 - str4d:3164-sapling-sighash, r=str4d
ZIP 243: Sapling SignatureHash Closes #3164.
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f0daf3915f
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@ -1065,6 +1065,10 @@ const unsigned char ZCASH_OUTPUTS_HASH_PERSONALIZATION[crypto_generichash_blake2
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{'Z','c','a','s','h','O','u','t','p','u','t','s','H','a','s','h'};
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const unsigned char ZCASH_JOINSPLITS_HASH_PERSONALIZATION[crypto_generichash_blake2b_PERSONALBYTES] =
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{'Z','c','a','s','h','J','S','p','l','i','t','s','H','a','s','h'};
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const unsigned char ZCASH_SHIELDED_SPENDS_HASH_PERSONALIZATION[crypto_generichash_blake2b_PERSONALBYTES] =
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{'Z','c','a','s','h','S','S','p','e','n','d','s','H','a','s','h'};
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const unsigned char ZCASH_SHIELDED_OUTPUTS_HASH_PERSONALIZATION[crypto_generichash_blake2b_PERSONALBYTES] =
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{'Z','c','a','s','h','S','O','u','t','p','u','t','H','a','s','h'};
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uint256 GetPrevoutHash(const CTransaction& txTo) {
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CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_PREVOUTS_HASH_PERSONALIZATION);
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@ -1099,6 +1103,26 @@ uint256 GetJoinSplitsHash(const CTransaction& txTo) {
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return ss.GetHash();
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}
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uint256 GetShieldedSpendsHash(const CTransaction& txTo) {
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CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_SHIELDED_SPENDS_HASH_PERSONALIZATION);
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for (unsigned int n = 0; n < txTo.vShieldedSpend.size(); n++) {
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ss << txTo.vShieldedSpend[n].cv;
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ss << txTo.vShieldedSpend[n].anchor;
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ss << txTo.vShieldedSpend[n].nullifier;
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ss << txTo.vShieldedSpend[n].rk;
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ss << txTo.vShieldedSpend[n].zkproof;
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}
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return ss.GetHash();
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}
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uint256 GetShieldedOutputsHash(const CTransaction& txTo) {
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CBLAKE2bWriter ss(SER_GETHASH, 0, ZCASH_SHIELDED_OUTPUTS_HASH_PERSONALIZATION);
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for (unsigned int n = 0; n < txTo.vShieldedOutput.size(); n++) {
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ss << txTo.vShieldedOutput[n];
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}
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return ss.GetHash();
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}
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} // anon namespace
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PrecomputedTransactionData::PrecomputedTransactionData(const CTransaction& txTo)
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@ -1107,12 +1131,18 @@ PrecomputedTransactionData::PrecomputedTransactionData(const CTransaction& txTo)
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hashSequence = GetSequenceHash(txTo);
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hashOutputs = GetOutputsHash(txTo);
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hashJoinSplits = GetJoinSplitsHash(txTo);
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hashShieldedSpends = GetShieldedSpendsHash(txTo);
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hashShieldedOutputs = GetShieldedOutputsHash(txTo);
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}
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SigVersion SignatureHashVersion(const CTransaction& txTo)
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{
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if (txTo.fOverwintered) {
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return SIGVERSION_OVERWINTER;
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if (txTo.nVersionGroupId == SAPLING_VERSION_GROUP_ID) {
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return SIGVERSION_SAPLING;
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} else {
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return SIGVERSION_OVERWINTER;
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}
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} else {
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return SIGVERSION_SPROUT;
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}
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@ -1134,11 +1164,13 @@ uint256 SignatureHash(
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auto sigversion = SignatureHashVersion(txTo);
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if (sigversion == SIGVERSION_OVERWINTER) {
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if (sigversion == SIGVERSION_OVERWINTER || sigversion == SIGVERSION_SAPLING) {
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uint256 hashPrevouts;
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uint256 hashSequence;
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uint256 hashOutputs;
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uint256 hashJoinSplits;
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uint256 hashShieldedSpends;
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uint256 hashShieldedOutputs;
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if (!(nHashType & SIGHASH_ANYONECANPAY)) {
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hashPrevouts = cache ? cache->hashPrevouts : GetPrevoutHash(txTo);
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@ -1160,6 +1192,14 @@ uint256 SignatureHash(
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hashJoinSplits = cache ? cache->hashJoinSplits : GetJoinSplitsHash(txTo);
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}
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if (!txTo.vShieldedSpend.empty()) {
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hashShieldedSpends = cache ? cache->hashShieldedSpends : GetShieldedSpendsHash(txTo);
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}
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if (!txTo.vShieldedOutput.empty()) {
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hashShieldedOutputs = cache ? cache->hashShieldedOutputs : GetShieldedOutputsHash(txTo);
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}
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uint32_t leConsensusBranchId = htole32(consensusBranchId);
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unsigned char personalization[16] = {};
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memcpy(personalization, "ZcashSigHash", 12);
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@ -1177,10 +1217,20 @@ uint256 SignatureHash(
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ss << hashOutputs;
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// JoinSplits
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ss << hashJoinSplits;
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if (sigversion == SIGVERSION_SAPLING) {
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// Spend descriptions
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ss << hashShieldedSpends;
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// Output descriptions
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ss << hashShieldedOutputs;
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}
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// Locktime
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ss << txTo.nLockTime;
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// Expiry height
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ss << txTo.nExpiryHeight;
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if (sigversion == SIGVERSION_SAPLING) {
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// Sapling value balance
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ss << txTo.valueBalance;
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}
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// Sighash type
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ss << nHashType;
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@ -92,7 +92,7 @@ bool CheckSignatureEncoding(const std::vector<unsigned char> &vchSig, unsigned i
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struct PrecomputedTransactionData
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{
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uint256 hashPrevouts, hashSequence, hashOutputs, hashJoinSplits;
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uint256 hashPrevouts, hashSequence, hashOutputs, hashJoinSplits, hashShieldedSpends, hashShieldedOutputs;
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PrecomputedTransactionData(const CTransaction& tx);
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};
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@ -101,6 +101,7 @@ enum SigVersion
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{
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SIGVERSION_SPROUT = 0,
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SIGVERSION_OVERWINTER = 1,
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SIGVERSION_SAPLING = 2,
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};
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uint256 SignatureHash(
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File diff suppressed because one or more lines are too long
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@ -99,23 +99,37 @@ void static RandomScript(CScript &script) {
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// https://stackoverflow.com/a/19728404
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std::random_device rd;
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std::mt19937 rng(rd());
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std::uniform_int_distribution<int> version_dist(CTransaction::OVERWINTER_MIN_CURRENT_VERSION,
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CTransaction::OVERWINTER_MAX_CURRENT_VERSION);
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std::uniform_int_distribution<int> overwinter_version_dist(
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CTransaction::OVERWINTER_MIN_CURRENT_VERSION,
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CTransaction::OVERWINTER_MAX_CURRENT_VERSION);
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std::uniform_int_distribution<int> sapling_version_dist(
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CTransaction::SAPLING_MIN_CURRENT_VERSION,
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CTransaction::SAPLING_MAX_CURRENT_VERSION);
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void static RandomTransaction(CMutableTransaction &tx, bool fSingle, uint32_t consensusBranchId) {
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tx.fOverwintered = insecure_rand() % 2;
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if (tx.fOverwintered) {
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tx.nVersion = version_dist(rng);
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tx.nVersionGroupId = OVERWINTER_VERSION_GROUP_ID;
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if (insecure_rand() % 2) {
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tx.nVersionGroupId = SAPLING_VERSION_GROUP_ID;
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tx.nVersion = sapling_version_dist(rng);
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} else {
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tx.nVersionGroupId = OVERWINTER_VERSION_GROUP_ID;
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tx.nVersion = overwinter_version_dist(rng);
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}
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tx.nExpiryHeight = (insecure_rand() % 2) ? insecure_rand() : 0;
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} else {
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tx.nVersion = insecure_rand() & 0x7FFFFFFF;
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}
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tx.vin.clear();
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tx.vout.clear();
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tx.vShieldedSpend.clear();
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tx.vShieldedOutput.clear();
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tx.vjoinsplit.clear();
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tx.nLockTime = (insecure_rand() % 2) ? insecure_rand() : 0;
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int ins = (insecure_rand() % 4) + 1;
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int outs = fSingle ? ins : (insecure_rand() % 4) + 1;
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int shielded_spends = (insecure_rand() % 4) + 1;
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int shielded_outs = (insecure_rand() % 4) + 1;
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int joinsplits = (insecure_rand() % 4);
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for (int in = 0; in < ins; in++) {
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tx.vin.push_back(CTxIn());
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@ -131,6 +145,28 @@ void static RandomTransaction(CMutableTransaction &tx, bool fSingle, uint32_t co
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txout.nValue = insecure_rand() % 100000000;
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RandomScript(txout.scriptPubKey);
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}
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if (tx.nVersionGroupId == SAPLING_VERSION_GROUP_ID) {
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tx.valueBalance = insecure_rand() % 100000000;
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for (int spend = 0; spend < shielded_spends; spend++) {
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SpendDescription sdesc;
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sdesc.cv = GetRandHash();
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sdesc.anchor = GetRandHash();
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sdesc.nullifier = GetRandHash();
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sdesc.rk = GetRandHash();
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randombytes_buf(sdesc.zkproof.begin(), sdesc.zkproof.size());
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tx.vShieldedSpend.push_back(sdesc);
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}
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for (int out = 0; out < shielded_outs; out++) {
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OutputDescription odesc;
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odesc.cv = GetRandHash();
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odesc.cm = GetRandHash();
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odesc.ephemeralKey = GetRandHash();
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randombytes_buf(odesc.encCiphertext.begin(), odesc.encCiphertext.size());
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randombytes_buf(odesc.outCiphertext.begin(), odesc.outCiphertext.size());
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randombytes_buf(odesc.zkproof.begin(), odesc.zkproof.size());
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tx.vShieldedOutput.push_back(odesc);
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}
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}
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if (tx.nVersion >= 2) {
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for (int js = 0; js < joinsplits; js++) {
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JSDescription jsdesc;
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@ -147,7 +183,13 @@ void static RandomTransaction(CMutableTransaction &tx, bool fSingle, uint32_t co
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jsdesc.randomSeed = GetRandHash();
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randombytes_buf(jsdesc.ciphertexts[0].begin(), jsdesc.ciphertexts[0].size());
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randombytes_buf(jsdesc.ciphertexts[1].begin(), jsdesc.ciphertexts[1].size());
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jsdesc.proof = libzcash::ZCProof::random_invalid();
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if (tx.fOverwintered && tx.nVersion >= SAPLING_TX_VERSION) {
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libzcash::GrothProof zkproof;
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randombytes_buf(zkproof.begin(), zkproof.size());
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jsdesc.proof = zkproof;
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} else {
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jsdesc.proof = libzcash::ZCProof::random_invalid();
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}
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jsdesc.macs[0] = GetRandHash();
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jsdesc.macs[1] = GetRandHash();
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@ -187,7 +229,7 @@ BOOST_AUTO_TEST_CASE(sighash_test)
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#endif
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for (int i=0; i<nRandomTests; i++) {
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int nHashType = insecure_rand();
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uint32_t consensusBranchId = insecure_rand() % 2 ? SPROUT_BRANCH_ID : overwinterBranchId;
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uint32_t consensusBranchId = NetworkUpgradeInfo[insecure_rand() % Consensus::MAX_NETWORK_UPGRADES].nBranchId;
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CMutableTransaction txTo;
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RandomTransaction(txTo, (nHashType & 0x1f) == SIGHASH_SINGLE, consensusBranchId);
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CScript scriptCode;
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