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-rw-r--r--src/psbt.cpp19
1 files changed, 19 insertions, 0 deletions
diff --git a/src/psbt.cpp b/src/psbt.cpp
index d765133190..fe74002e82 100644
--- a/src/psbt.cpp
+++ b/src/psbt.cpp
@@ -212,6 +212,25 @@ bool PSBTInputSigned(const PSBTInput& input)
return !input.final_script_sig.empty() || !input.final_script_witness.IsNull();
}
+void UpdatePSBTOutput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index)
+{
+ const CTxOut& out = psbt.tx->vout.at(index);
+ PSBTOutput& psbt_out = psbt.outputs.at(index);
+
+ // Fill a SignatureData with output info
+ SignatureData sigdata;
+ psbt_out.FillSignatureData(sigdata);
+
+ // Construct a would-be spend of this output, to update sigdata with.
+ // Note that ProduceSignature is used to fill in metadata (not actual signatures),
+ // so provider does not need to provide any private keys (it can be a HidingSigningProvider).
+ MutableTransactionSignatureCreator creator(psbt.tx.get_ptr(), /* index */ 0, out.nValue, SIGHASH_ALL);
+ ProduceSignature(provider, creator, out.scriptPubKey, sigdata);
+
+ // Put redeem_script, witness_script, key paths, into PSBTOutput.
+ psbt_out.FromSignatureData(sigdata);
+}
+
bool SignPSBTInput(const SigningProvider& provider, PartiallySignedTransaction& psbt, int index, int sighash, SignatureData* out_sigdata, bool use_dummy)
{
PSBTInput& input = psbt.inputs.at(index);