From 19e4c023b6812b3320a80c7fedd365d647e3b60b Mon Sep 17 00:00:00 2001
From: jl777 <jameslee777@yahoo.com>
Date: Sun, 21 Oct 2018 11:36:18 -1100
Subject: [PATCH] ASSETCHAINS_TXPOW for signrawtransaction

---
 src/komodo_defs.h         |  2 +
 src/rpcrawtransaction.cpp | 77 +++++++++++++++++++++++++++------------
 2 files changed, 55 insertions(+), 24 deletions(-)

diff --git a/src/komodo_defs.h b/src/komodo_defs.h
index 7c339856c..1efd187d9 100644
--- a/src/komodo_defs.h
+++ b/src/komodo_defs.h
@@ -10,4 +10,6 @@
 #define KOMODO_MAXMEMPOOLTIME 3600 // affects consensus
 #define CRYPTO777_PUBSECPSTR "020e46e79a2a8d12b9b5d12c7a91adb4e454edfae43c0a0cb805427d2ac7613fd9"
 
+extern uint8_t ASSETCHAINS_TXPOW;
+
 #endif
diff --git a/src/rpcrawtransaction.cpp b/src/rpcrawtransaction.cpp
index a870d526c..e7d1d991d 100644
--- a/src/rpcrawtransaction.cpp
+++ b/src/rpcrawtransaction.cpp
@@ -1058,35 +1058,64 @@ UniValue signrawtransaction(const UniValue& params, bool fHelp)
 
     // Use CTransaction for the constant parts of the
     // transaction to avoid rehashing.
+    CMutableTransaction mergedTxsave = mergedTx;
+    int32_t txpow,numiters = 0;
     const CTransaction txConst(mergedTx);
-    // Sign what we can:
-    for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {
-        CTxIn& txin = mergedTx.vin[i];
-        const CCoins* coins = view.AccessCoins(txin.prevout.hash);
-        if (coins == NULL || !coins->IsAvailable(txin.prevout.n)) {
-            TxInErrorToJSON(txin, vErrors, "Input not found or already spent");
-            continue;
+    if ( (txpow= ASSETCHAINS_TXPOW) != 0 )
+    {
+        if ( txConst.IsCoinBase() != 0 )
+        {
+            if ( (txpow & 2) == 0 )
+                txpow == 0;
         }
-        const CScript& prevPubKey = coins->vout[txin.prevout.n].scriptPubKey;
-        const CAmount& amount = coins->vout[txin.prevout.n].nValue;
-
-        SignatureData sigdata;
-        // Only sign SIGHASH_SINGLE if there's a corresponding output:
-        if (!fHashSingle || (i < mergedTx.vout.size()))
-            ProduceSignature(MutableTransactionSignatureCreator(&keystore, &mergedTx, i, amount, nHashType), prevPubKey, sigdata, consensusBranchId);
-
-        // ... and merge in other signatures:
-        BOOST_FOREACH(const CMutableTransaction& txv, txVariants) {
-            sigdata = CombineSignatures(prevPubKey, TransactionSignatureChecker(&txConst, i, amount), sigdata, DataFromTransaction(txv, i), consensusBranchId);
+        else
+        {
+            if ( (txpow & 1) == 0 )
+                txpow == 0;
         }
-
-        UpdateTransaction(mergedTx, i, sigdata);
-
-        ScriptError serror = SCRIPT_ERR_OK;
-        if (!VerifyScript(txin.scriptSig, prevPubKey, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount), consensusBranchId, &serror)) {
-            TxInErrorToJSON(txin, vErrors, ScriptErrorString(serror));
+    }
+    while ( 1 )
+    {
+        if ( txpow != 0 )
+            mergedTx = mergedTxsave;
+        // Sign what we can:
+        for (unsigned int i = 0; i < mergedTx.vin.size(); i++) {
+            CTxIn& txin = mergedTx.vin[i];
+            const CCoins* coins = view.AccessCoins(txin.prevout.hash);
+            if (coins == NULL || !coins->IsAvailable(txin.prevout.n)) {
+                TxInErrorToJSON(txin, vErrors, "Input not found or already spent");
+                continue;
+            }
+            const CScript& prevPubKey = coins->vout[txin.prevout.n].scriptPubKey;
+            const CAmount& amount = coins->vout[txin.prevout.n].nValue;
+            
+            SignatureData sigdata;
+            // Only sign SIGHASH_SINGLE if there's a corresponding output:
+            if (!fHashSingle || (i < mergedTx.vout.size()))
+                ProduceSignature(MutableTransactionSignatureCreator(&keystore, &mergedTx, i, amount, nHashType), prevPubKey, sigdata, consensusBranchId);
+            
+            // ... and merge in other signatures:
+            BOOST_FOREACH(const CMutableTransaction& txv, txVariants) {
+                sigdata = CombineSignatures(prevPubKey, TransactionSignatureChecker(&txConst, i, amount), sigdata, DataFromTransaction(txv, i), consensusBranchId);
+            }
+            
+            UpdateTransaction(mergedTx, i, sigdata);
+            
+            ScriptError serror = SCRIPT_ERR_OK;
+            if (!VerifyScript(txin.scriptSig, prevPubKey, STANDARD_SCRIPT_VERIFY_FLAGS, TransactionSignatureChecker(&txConst, i, amount), consensusBranchId, &serror)) {
+                TxInErrorToJSON(txin, vErrors, ScriptErrorString(serror));
+            }
+        }
+        if ( txpow != 0 )
+        {
+            uint256 txid = mergedTx.GetHash();
+            if ( ((uint8_t *)&txid)[0] == 0 && ((uint8_t *)&txid)[31] == 0 )
+                break;
         }
+        numiters++;
     }
+    if ( numiters > 0 )
+        fprintf(stderr,"ASSETCHAINS_TXPOW.%d txpow.%d numiters.%d for signature\n",ASSETCHAINS_TXPOW,txpow,numiters);
     bool fComplete = vErrors.empty();
 
     UniValue result(UniValue::VOBJ);