Remove scriptPubKey/scriptSig from CPourTx, and add randomSeed.

src/main.cpp

@@ -960,7 +960,10 @@ bool CheckTransaction(const CTransaction& tx, CValidationState &state)
 
         if (state.PerformPourVerification()) {
             BOOST_FOREACH(const CPourTx &pour, tx.vpour) {
-                if (!pour.Verify(*pzerocashParams)) {
+                // TODO: #808
+                uint256 pubKeyHash;
+
+                if (!pour.Verify(*pzerocashParams, pubKeyHash)) {
                     return state.DoS(100, error("CheckTransaction(): pour does not verify"),
                                      REJECT_INVALID, "bad-txns-pour-verification-failed");
                 }

src/primitives/transaction.cpp

@@ -33,22 +33,15 @@ boost::array<uint256, N> unsigned_char_vector_array_to_uint256_array(const boost
 }
 
 CPourTx::CPourTx(ZerocashParams& params,
-            const CScript& scriptPubKey,
+            const uint256& pubKeyHash,
             const uint256& anchor,
             const boost::array<PourInput, ZC_NUM_JS_INPUTS>& inputs,
             const boost::array<PourOutput, ZC_NUM_JS_OUTPUTS>& outputs,
             CAmount vpub_old,
-            CAmount vpub_new) : scriptSig(), scriptPubKey(scriptPubKey), vpub_old(vpub_old), vpub_new(vpub_new), anchor(anchor)
+            CAmount vpub_new) : vpub_old(vpub_old), vpub_new(vpub_new), anchor(anchor)
 {
-    uint256 scriptPubKeyHash;
-    {
-        CHashWriter ss(SER_GETHASH, 0);
-        ss << scriptPubKey;
-        scriptPubKeyHash = ss.GetHash();
-    }
-
     PourTransaction pourtx(params,
-                           std::vector<unsigned char>(scriptPubKeyHash.begin(), scriptPubKeyHash.end()),
+                           std::vector<unsigned char>(pubKeyHash.begin(), pubKeyHash.end()),
                            std::vector<unsigned char>(anchor.begin(), anchor.end()),
                            std::vector<PourInput>(inputs.begin(), inputs.end()),
                            std::vector<PourOutput>(outputs.begin(), outputs.end()),
@@ -65,18 +58,13 @@ CPourTx::CPourTx(ZerocashParams& params,
     macs = unsigned_char_vector_array_to_uint256_array(macs_bv);
 }
 
-bool CPourTx::Verify(ZerocashParams& params) const {
-    // Compute the hash of the scriptPubKey.
-    uint256 scriptPubKeyHash;
-    {
-        CHashWriter ss(SER_GETHASH, 0);
-        ss << scriptPubKey;
-        scriptPubKeyHash = ss.GetHash();
-    }
-
+bool CPourTx::Verify(
+    ZerocashParams& params,
+    const uint256& pubKeyHash
+) const {
     return PourProver::VerifyProof(
         params,
-        std::vector<unsigned char>(scriptPubKeyHash.begin(), scriptPubKeyHash.end()),
+        std::vector<unsigned char>(pubKeyHash.begin(), pubKeyHash.end()),
         std::vector<unsigned char>(anchor.begin(), anchor.end()),
         vpub_old,
         vpub_new,

src/primitives/transaction.h

@@ -30,14 +30,6 @@ public:
     CAmount vpub_old;
     CAmount vpub_new;
 
-    // These scripts are used to bind a Pour to the outer
-    // transaction it is placed in. The Pour will
-    // authenticate the hash of the scriptPubKey, and the
-    // provided scriptSig with be appended during
-    // transaction verification.
-    CScript scriptPubKey;
-    CScript scriptSig;
-
     // Pours are always anchored to a root in the bucket
     // commitment tree at some point in the blockchain
     // history or in the history of the current
@@ -66,6 +58,9 @@ public:
     // Ephemeral key
     uint256 ephemeralKey;
 
+    // Random seed
+    uint256 randomSeed;
+
     // MACs
     // The verification of the pour requires these MACs
     // to be provided as an input.
@@ -78,7 +73,7 @@ public:
     CPourTx(): vpub_old(0), vpub_new(0) { }
 
     CPourTx(ZerocashParams& params,
-            const CScript& scriptPubKey,
+            const uint256& pubKeyHash,
             const uint256& rt,
             const boost::array<PourInput, ZC_NUM_JS_INPUTS>& inputs,
             const boost::array<PourOutput, ZC_NUM_JS_OUTPUTS>& outputs,
@@ -87,7 +82,7 @@ public:
     );
 
     // Verifies that the pour proof is correct.
-    bool Verify(ZerocashParams& params) const;
+    bool Verify(ZerocashParams& params, const uint256& pubKeyHash) const;
 
     ADD_SERIALIZE_METHODS;
 
@@ -95,13 +90,12 @@ public:
     inline void SerializationOp(Stream& s, Operation ser_action, int nType, int nVersion) {
         READWRITE(vpub_old);
         READWRITE(vpub_new);
-        READWRITE(scriptPubKey);
-        READWRITE(scriptSig);
         READWRITE(anchor);
         READWRITE(serials);
         READWRITE(commitments);
         READWRITE(ciphertexts);
         READWRITE(ephemeralKey);
+        READWRITE(randomSeed);
         READWRITE(macs);
         READWRITE(proof);
     }
@@ -111,13 +105,12 @@ public:
         return (
             a.vpub_old == b.vpub_old &&
             a.vpub_new == b.vpub_new &&
-            a.scriptPubKey == b.scriptPubKey &&
-            a.scriptSig == b.scriptSig &&
             a.anchor == b.anchor &&
             a.serials == b.serials &&
             a.commitments == b.commitments &&
             a.ciphertexts == b.ciphertexts &&
             a.ephemeralKey == b.ephemeralKey &&
+            a.randomSeed == b.randomSeed &&
             a.macs == b.macs &&
             a.proof == b.proof
             );

src/rpcrawtransaction.cpp

@@ -124,19 +124,9 @@ void TxToJSON(const CTransaction& tx, const uint256 hashBlock, Object& entry)
         pour.push_back(Pair("vpub_old", ValueFromAmount(pourtx.vpub_old)));
         pour.push_back(Pair("vpub_new", ValueFromAmount(pourtx.vpub_new)));
 
-        {
-            Object o;
-            ScriptPubKeyToJSON(pourtx.scriptPubKey, o, true);
-            pour.push_back(Pair("scriptPubKey", o));
-        }
-
-        {
-            Object o;
-            ScriptPubKeyToJSON(pourtx.scriptSig, o, true);
-            pour.push_back(Pair("scriptSig", o));
-        }
-
-        pour.push_back(Pair("valid", pourtx.Verify(*pzerocashParams)));
+        // TODO: #808
+        uint256 pubKeyHash;
+        pour.push_back(Pair("valid", pourtx.Verify(*pzerocashParams, pubKeyHash)));
 
         vpour.push_back(pour);
     }

src/test/sighash_tests.cpp

@@ -124,12 +124,12 @@ void static RandomTransaction(CMutableTransaction &tx, bool fSingle) {
             } else {
                 pourtx.vpub_new = insecure_rand() % 100000000;
             }
-            RandomScript(pourtx.scriptPubKey);
-            RandomScript(pourtx.scriptSig);
+
             pourtx.anchor = GetRandHash();
             pourtx.serials[0] = GetRandHash();
             pourtx.serials[1] = GetRandHash();
             pourtx.ephemeralKey = GetRandHash();
+            pourtx.randomSeed = GetRandHash();
             pourtx.ciphertexts[0] = {insecure_rand() % 100, insecure_rand() % 100};
             pourtx.ciphertexts[1] = {insecure_rand() % 100, insecure_rand() % 100};
             pourtx.macs[0] = GetRandHash();

src/test/transaction_tests.cpp

@@ -335,7 +335,7 @@ BOOST_AUTO_TEST_CASE(test_basic_pour_verification)
     auto path = witness.path();
 
     // create CPourTx
-    CScript scriptPubKey;
+    uint256 pubKeyHash;
     boost::array<PourInput, ZC_NUM_JS_INPUTS> inputs = {
         PourInput(coin, addr, path),
         PourInput(INCREMENTAL_MERKLE_TREE_DEPTH) // dummy input of zero value
@@ -346,8 +346,8 @@ BOOST_AUTO_TEST_CASE(test_basic_pour_verification)
     };
 
     {
-        CPourTx pourtx(p, scriptPubKey, uint256(rt), inputs, outputs, 0, 0);
-        BOOST_CHECK(pourtx.Verify(p));
+        CPourTx pourtx(p, pubKeyHash, uint256(rt), inputs, outputs, 0, 0);
+        BOOST_CHECK(pourtx.Verify(p, pubKeyHash));
 
         CDataStream ss(SER_DISK, CLIENT_VERSION);
         ss << pourtx;
@@ -356,20 +356,20 @@ BOOST_AUTO_TEST_CASE(test_basic_pour_verification)
         ss >> pourtx_deserialized;
 
         BOOST_CHECK(pourtx_deserialized == pourtx);
-        BOOST_CHECK(pourtx_deserialized.Verify(p));
+        BOOST_CHECK(pourtx_deserialized.Verify(p, pubKeyHash));
     }
 
     {
         // Ensure that the balance equation is working.
-        BOOST_CHECK_THROW(CPourTx(p, scriptPubKey, uint256(rt), inputs, outputs, 10, 0), std::invalid_argument);
-        BOOST_CHECK_THROW(CPourTx(p, scriptPubKey, uint256(rt), inputs, outputs, 0, 10), std::invalid_argument);
+        BOOST_CHECK_THROW(CPourTx(p, pubKeyHash, uint256(rt), inputs, outputs, 10, 0), std::invalid_argument);
+        BOOST_CHECK_THROW(CPourTx(p, pubKeyHash, uint256(rt), inputs, outputs, 0, 10), std::invalid_argument);
     }
 
     {
         // Ensure that it won't verify if the root is changed.
-        auto test = CPourTx(p, scriptPubKey, uint256(rt), inputs, outputs, 0, 0);
+        auto test = CPourTx(p, pubKeyHash, uint256(rt), inputs, outputs, 0, 0);
         test.anchor = GetRandHash();
-        BOOST_CHECK(!test.Verify(p));
+        BOOST_CHECK(!test.Verify(p, pubKeyHash));
     }
 }
 

src/wallet/rpcwallet.cpp

@@ -2646,16 +2646,17 @@ Value zc_raw_pour(const json_spirit::Array& params, bool fHelp)
         throw runtime_error("unsupported pour input/output counts");
     }
 
-    CScript scriptPubKey;
+    // TODO: #808
+    uint256 pubKeyHash;
     CPourTx pourtx(*pzerocashParams,
-                   scriptPubKey,
+                   pubKeyHash,
                    anchor,
                    {vpourin[0], vpourin[1]},
                    {vpourout[0], vpourout[1]},
                    vpub_old,
                    vpub_new);
 
-    assert(pourtx.Verify(*pzerocashParams));
+    assert(pourtx.Verify(*pzerocashParams, pubKeyHash));
 
     CMutableTransaction mtx(tx);
     mtx.nVersion = 2;

src/zcbenchmarks.cpp

@@ -65,7 +65,8 @@ double benchmark_parameter_loading()
 
 double benchmark_create_joinsplit()
 {
-    CScript scriptPubKey;
+    // TODO: #808
+    uint256 pubKeyHash;
 
     std::vector<PourInput> vpourin;
     std::vector<PourOutput> vpourout;
@@ -83,21 +84,24 @@ double benchmark_create_joinsplit()
 
     timer_start();
     CPourTx pourtx(*pzerocashParams,
-                   scriptPubKey,
+                   pubKeyHash,
                    anchor,
                    {vpourin[0], vpourin[1]},
                    {vpourout[0], vpourout[1]},
                    0,
                    0);
     double ret = timer_stop();
-    assert(pourtx.Verify(*pzerocashParams));
+
+    assert(pourtx.Verify(*pzerocashParams, pubKeyHash));
     return ret;
 }
 
 double benchmark_verify_joinsplit(const CPourTx &joinsplit)
 {
     timer_start();
-    joinsplit.Verify(*pzerocashParams);
+    // TODO: #808
+    uint256 pubKeyHash;
+    joinsplit.Verify(*pzerocashParams, pubKeyHash);
     return timer_stop();
 }