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BIP143: Signing logic

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This commit is contained in:
Pieter Wuille
2016-03-31 14:54:58 +02:00
parent 9757b57c25
commit 605e8473a7
12 changed files with 394 additions and 178 deletions
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28
src/bitcoin-tx.cpp
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@@ -363,6 +363,18 @@ vector<unsigned char> ParseHexUO(map<string,UniValue>& o, string strKey)
return ParseHexUV(o[strKey], strKey);
}
static CAmount AmountFromValue(const UniValue& value)
{
if (!value.isNum() && !value.isStr())
throw runtime_error("Amount is not a number or string");
CAmount amount;
if (!ParseFixedPoint(value.getValStr(), 8, &amount))
throw runtime_error("Invalid amount");
if (!MoneyRange(amount))
throw runtime_error("Amount out of range");
return amount;
}
static void MutateTxSign(CMutableTransaction& tx, const string& flagStr)
{
int nHashType = SIGHASH_ALL;
@@ -434,7 +446,10 @@ static void MutateTxSign(CMutableTransaction& tx, const string& flagStr)
if ((unsigned int)nOut >= coins->vout.size())
coins->vout.resize(nOut+1);
coins->vout[nOut].scriptPubKey = scriptPubKey;
coins->vout[nOut].nValue = 0; // we don't know the actual output value
coins->vout[nOut].nValue = 0;
if (prevOut.exists("amount")) {
coins->vout[nOut].nValue = AmountFromValue(prevOut["amount"]);
}
}
// if redeemScript given and private keys given,
@@ -464,15 +479,16 @@ static void MutateTxSign(CMutableTransaction& tx, const string& flagStr)
const CScript& prevPubKey = coins->vout[txin.prevout.n].scriptPubKey;
const CAmount& amount = coins->vout[txin.prevout.n].nValue;
txin.scriptSig.clear();
SignatureData sigdata;
// Only sign SIGHASH_SINGLE if there's a corresponding output:
if (!fHashSingle || (i < mergedTx.vout.size()))
SignSignature(keystore, prevPubKey, mergedTx, i, nHashType);
ProduceSignature(MutableTransactionSignatureCreator(&keystore, &mergedTx, i, amount, nHashType), prevPubKey, sigdata);
// ... and merge in other signatures:
BOOST_FOREACH(const CTransaction& txv, txVariants) {
txin.scriptSig = CombineSignatures(prevPubKey, mergedTx, i, amount, txin.scriptSig, txv.vin[i].scriptSig);
}
BOOST_FOREACH(const CTransaction& txv, txVariants)
sigdata = CombineSignatures(prevPubKey, MutableTransactionSignatureChecker(&mergedTx, i, amount), sigdata, DataFromTransaction(txv, i));
UpdateTransaction(mergedTx, i, sigdata);
if (!VerifyScript(txin.scriptSig, prevPubKey, mergedTx.wit.vtxinwit.size() > i ? &mergedTx.wit.vtxinwit[i].scriptWitness : NULL, STANDARD_SCRIPT_VERIFY_FLAGS, MutableTransactionSignatureChecker(&mergedTx, i, amount)))
fComplete = false;
}