Allow PUBKEY_DROP inputs on testnet

[novacoin.git] / src / script.cpp

diff --git a/src/script.cpp b/src/script.cpp
index 88587a0..90be3eb 100644 (file)
--- a/src/script.cpp
+++ b/src/script.cpp
@@ -99,6 +99,7 @@ const char* GetTxnOutputType(txnouttype t)
     {
     case TX_NONSTANDARD: return "nonstandard";
     case TX_PUBKEY: return "pubkey";
+    case TX_PUBKEY_DROP: return "pubkeydrop";
     case TX_PUBKEYHASH: return "pubkeyhash";
     case TX_SCRIPTHASH: return "scripthash";
     case TX_MULTISIG: return "multisig";
@@ -334,7 +335,7 @@ bool IsCanonicalSignature(const valtype &vchSig, unsigned int flags) {
     if (!(flags & SCRIPT_VERIFY_STRICTENC))
         return true;
 
-    return IsDERSignature(vchSig, true, flags & SCRIPT_VERIFY_LOW_S);
+    return IsDERSignature(vchSig, true, (flags & SCRIPT_VERIFY_LOW_S) != 0);
 }
 
 bool EvalScript(vector<vector<unsigned char> >& stack, const CScript& script, const CTransaction& txTo, unsigned int nIn, unsigned int flags, int nHashType)
@@ -1194,6 +1195,12 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
         // Standard tx, sender provides pubkey, receiver adds signature
         mTemplates.insert(make_pair(TX_PUBKEY, CScript() << OP_PUBKEY << OP_CHECKSIG));
 
+        if (fTestNet || GetTime() > SMALLDATA_SWITCH_TIME)
+        {
+            // Malleable pubkey tx hack, sender provides generated pubkey combined with R parameter. The R parameter is dropped before checking a signature.
+            mTemplates.insert(make_pair(TX_PUBKEY_DROP, CScript() << OP_PUBKEY << OP_PUBKEY << OP_DROP << OP_CHECKSIG));
+        }
+
         // Bitcoin address tx, sender provides hash of pubkey, receiver provides signature and pubkey
         mTemplates.insert(make_pair(TX_PUBKEYHASH, CScript() << OP_DUP << OP_HASH160 << OP_PUBKEYHASH << OP_EQUALVERIFY << OP_CHECKSIG));
 
@@ -1288,8 +1295,8 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
             }
             else if (opcode2 == OP_SMALLDATA)
             {
-                // small pushdata, <= 80 bytes
-                if (vch1.size() > 80)
+                // small pushdata, <= 1024 bytes
+                if (vch1.size() > (GetTime() > SMALLDATA_SWITCH_TIME ? 1024 : 80))
                     break;
             }
             else if (opcode1 != opcode2 || vch1 != vch2)
@@ -1306,7 +1313,7 @@ bool Solver(const CScript& scriptPubKey, txnouttype& typeRet, vector<vector<unsi
 }
 
 
-bool Sign1(const CKeyID& address, const CKeyStore& keystore, uint256 hash, int nHashType, CScript& scriptSigRet)
+bool Sign1(const CKeyID& address, const CKeyStore& keystore, const uint256& hash, int nHashType, CScript& scriptSigRet)
 {
     CKey key;
     if (!keystore.GetKey(address, key))
@@ -1321,7 +1328,22 @@ bool Sign1(const CKeyID& address, const CKeyStore& keystore, uint256 hash, int n
     return true;
 }
 
-bool SignN(const vector<valtype>& multisigdata, const CKeyStore& keystore, uint256 hash, int nHashType, CScript& scriptSigRet)
+bool SignR(const CPubKey& pubKey, const CPubKey& R, const CKeyStore& keystore, const uint256& hash, int nHashType, CScript& scriptSigRet)
+{
+    CKey key;
+    if (!keystore.CreatePrivKey(pubKey, R, key))
+        return false;
+
+    vector<unsigned char> vchSig;
+    if (!key.Sign(hash, vchSig))
+        return false;
+    vchSig.push_back((unsigned char)nHashType);
+    scriptSigRet << vchSig;
+
+    return true;
+}
+
+bool SignN(const vector<valtype>& multisigdata, const CKeyStore& keystore, const uint256& hash, int nHashType, CScript& scriptSigRet)
 {
     int nSigned = 0;
     int nRequired = multisigdata.front()[0];
@@ -1341,7 +1363,7 @@ bool SignN(const vector<valtype>& multisigdata, const CKeyStore& keystore, uint2
 // unless whichTypeRet is TX_SCRIPTHASH, in which case scriptSigRet is the redemption script.
 // Returns false if scriptPubKey could not be completely satisfied.
 //
-bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, uint256 hash, int nHashType,
+bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, const uint256& hash, int nHashType,
                   CScript& scriptSigRet, txnouttype& whichTypeRet)
 {
     scriptSigRet.clear();
@@ -1359,6 +1381,12 @@ bool Solver(const CKeyStore& keystore, const CScript& scriptPubKey, uint256 hash
     case TX_PUBKEY:
         keyID = CPubKey(vSolutions[0]).GetID();
         return Sign1(keyID, keystore, hash, nHashType, scriptSigRet);
+    case TX_PUBKEY_DROP:
+        {
+            CPubKey key = CPubKey(vSolutions[0]);
+            CPubKey R = CPubKey(vSolutions[1]);
+            return SignR(key, R, keystore, hash, nHashType, scriptSigRet);
+        }
     case TX_PUBKEYHASH:
         keyID = CKeyID(uint160(vSolutions[0]));
         if (!Sign1(keyID, keystore, hash, nHashType, scriptSigRet))
@@ -1389,6 +1417,7 @@ int ScriptSigArgsExpected(txnouttype t, const std::vector<std::vector<unsigned c
     case TX_NULL_DATA:
         return 1;
     case TX_PUBKEY:
+    case TX_PUBKEY_DROP:
         return 1;
     case TX_PUBKEYHASH:
         return 2;
@@ -1475,6 +1504,14 @@ isminetype IsMine(const CKeyStore &keystore, const CScript& scriptPubKey)
         if (keystore.HaveKey(keyID))
             return MINE_SPENDABLE;
         break;
+    case TX_PUBKEY_DROP:
+        {
+            CPubKey key = CPubKey(vSolutions[0]);
+            CPubKey R = CPubKey(vSolutions[1]);
+            if (keystore.CheckOwnership(key, R))
+                return MINE_SPENDABLE;
+        }
+        break;
     case TX_PUBKEYHASH:
         keyID = CKeyID(uint160(vSolutions[0]));
         if (keystore.HaveKey(keyID))
@@ -1581,7 +1618,7 @@ bool ExtractDestinations(const CScript& scriptPubKey, txnouttype& typeRet, vecto
     vector<valtype> vSolutions;
     if (!Solver(scriptPubKey, typeRet, vSolutions))
         return false;
-    if (typeRet == TX_NULL_DATA)
+    if (typeRet == TX_NULL_DATA || typeRet == TX_PUBKEY_DROP)
         return true;
 
     if (typeRet == TX_MULTISIG)
@@ -1700,7 +1737,7 @@ static CScript PushAll(const vector<valtype>& values)
     return result;
 }
 
-static CScript CombineMultisig(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn,
+static CScript CombineMultisig(const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn,
                                const vector<valtype>& vSolutions,
                                vector<valtype>& sigs1, vector<valtype>& sigs2)
 {
@@ -1755,7 +1792,7 @@ static CScript CombineMultisig(CScript scriptPubKey, const CTransaction& txTo, u
     return result;
 }
 
-static CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn,
+static CScript CombineSignatures(const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn,
                                  const txnouttype txType, const vector<valtype>& vSolutions,
                                  vector<valtype>& sigs1, vector<valtype>& sigs2)
 {
@@ -1768,6 +1805,7 @@ static CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo,
             return PushAll(sigs1);
         return PushAll(sigs2);
     case TX_PUBKEY:
+    case TX_PUBKEY_DROP:
     case TX_PUBKEYHASH:
         // Signatures are bigger than placeholders or empty scripts:
         if (sigs1.empty() || sigs1[0].empty())
@@ -1800,7 +1838,7 @@ static CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo,
     return CScript();
 }
 
-CScript CombineSignatures(CScript scriptPubKey, const CTransaction& txTo, unsigned int nIn,
+CScript CombineSignatures(const CScript& scriptPubKey, const CTransaction& txTo, unsigned int nIn,
                           const CScript& scriptSig1, const CScript& scriptSig2)
 {
     txnouttype txType;
@@ -1929,6 +1967,13 @@ void CScript::SetDestination(const CTxDestination& dest)
     boost::apply_visitor(CScriptVisitor(this), dest);
 }
 
+void CScript::SetDestination(const CPubKey& R, CPubKey& pubKeyVariant)
+{
+    this->clear();
+    *this << pubKeyVariant << R << OP_DROP << OP_CHECKSIG;
+}
+
+
 void CScript::SetMultisig(int nRequired, const std::vector<CKey>& keys)
 {
     this->clear();