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rpc: bugfix, incorrect segwit redeem script size used in signrawtransactionwithkey

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The process currently fails to sign redeem scripts that are longer than
520 bytes. Even when it shouldn't. The 520 bytes redeem scripts limit
is a legacy p2sh rule, and not a segwit limitation.

Segwit redeem scripts are not restricted by the script item size limit.

The reason why this occurs, is the usage of the same keystore used by
the legacy spkm. Which contains blockage for any redeem scripts longer
than the script item size limit.
This commit is contained in:
furszy
2023-08-21 17:50:09 -03:00
parent 0c9fedfc45
commit 9d9a91c4ea
3 changed files with 11 additions and 7 deletions
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6
src/rpc/rawtransaction_util.cpp
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@@ -181,7 +181,7 @@ static void TxInErrorToJSON(const CTxIn& txin, UniValue& vErrorsRet, const std::
vErrorsRet.push_back(entry);
}
void ParsePrevouts(const UniValue& prevTxsUnival, FillableSigningProvider* keystore, std::map<COutPoint, Coin>& coins)
void ParsePrevouts(const UniValue& prevTxsUnival, FlatSigningProvider* keystore, std::map<COutPoint, Coin>& coins)
{
if (!prevTxsUnival.isNull()) {
const UniValue& prevTxs = prevTxsUnival.get_array();
@@ -247,11 +247,11 @@ void ParsePrevouts(const UniValue& prevTxsUnival, FillableSigningProvider* keyst
// work from witnessScript when possible
std::vector<unsigned char> scriptData(!ws.isNull() ? ParseHexV(ws, "witnessScript") : ParseHexV(rs, "redeemScript"));
CScript script(scriptData.begin(), scriptData.end());
keystore->AddCScript(script);
keystore->scripts.emplace(CScriptID(script), script);
// Automatically also add the P2WSH wrapped version of the script (to deal with P2SH-P2WSH).
// This is done for redeemScript only for compatibility, it is encouraged to use the explicit witnessScript field instead.
CScript witness_output_script{GetScriptForDestination(WitnessV0ScriptHash(script))};
keystore->AddCScript(witness_output_script);
keystore->scripts.emplace(CScriptID(witness_output_script), witness_output_script);
if (!ws.isNull() && !rs.isNull()) {
// if both witnessScript and redeemScript are provided,