sign: Include taproot output key's KeyOriginInfo in sigdata

Author: achow101

src/script/sign.cpp

@@ -355,11 +355,19 @@ static bool SignTaproot(const SigningProvider& provider, const BaseSignatureCrea
 
     // Try key path spending.
     {
-        KeyOriginInfo info;
-        if (provider.GetKeyOriginByXOnly(sigdata.tr_spenddata.internal_key, info)) {
+        KeyOriginInfo internal_key_info;
+        if (provider.GetKeyOriginByXOnly(sigdata.tr_spenddata.internal_key, internal_key_info)) {
             auto it = sigdata.taproot_misc_pubkeys.find(sigdata.tr_spenddata.internal_key);
             if (it == sigdata.taproot_misc_pubkeys.end()) {
-                sigdata.taproot_misc_pubkeys.emplace(sigdata.tr_spenddata.internal_key, std::make_pair(std::set<uint256>(), info));
+                sigdata.taproot_misc_pubkeys.emplace(sigdata.tr_spenddata.internal_key, std::make_pair(std::set<uint256>(), internal_key_info));
+            }
+        }
+
+        KeyOriginInfo output_key_info;
+        if (provider.GetKeyOriginByXOnly(output, output_key_info)) {
+            auto it = sigdata.taproot_misc_pubkeys.find(output);
+            if (it == sigdata.taproot_misc_pubkeys.end()) {
+                sigdata.taproot_misc_pubkeys.emplace(output, std::make_pair(std::set<uint256>(), output_key_info));
             }
         }
 

src/script/sign.h

@@ -80,7 +80,7 @@ struct SignatureData {
     std::map<CKeyID, std::pair<CPubKey, KeyOriginInfo>> misc_pubkeys;
     std::vector<unsigned char> taproot_key_path_sig; /// Schnorr signature for key path spending
     std::map<std::pair<XOnlyPubKey, uint256>, std::vector<unsigned char>> taproot_script_sigs; ///< (Partial) schnorr signatures, indexed by XOnlyPubKey and leaf_hash.
-    std::map<XOnlyPubKey, std::pair<std::set<uint256>, KeyOriginInfo>> taproot_misc_pubkeys; ///< Miscellaneous Taproot pubkeys involved in this input along with their leaf script hashes and key origin data. Also includes the Taproot internal key (may have no leaf script hashes).
+    std::map<XOnlyPubKey, std::pair<std::set<uint256>, KeyOriginInfo>> taproot_misc_pubkeys; ///< Miscellaneous Taproot pubkeys involved in this input along with their leaf script hashes and key origin data. Also includes the Taproot internal and output keys (may have no leaf script hashes).
     std::map<CKeyID, XOnlyPubKey> tap_pubkeys; ///< Misc Taproot pubkeys involved in this input, by hash. (Equivalent of misc_pubkeys but for Taproot.)
     std::vector<CKeyID> missing_pubkeys; ///< KeyIDs of pubkeys which could not be found
     std::vector<CKeyID> missing_sigs; ///< KeyIDs of pubkeys for signatures which could not be found