From 4d1223e5123e60be93b5ad42ba0aee72d0612ea7 Mon Sep 17 00:00:00 2001
From: Andrew Chow <achow101-github@achow101.com>
Date: Mon, 19 Jul 2021 15:29:55 -0400
Subject: Fetch key origins for Taproot keys

---
 src/script/sign.cpp | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

(limited to 'src/script')

diff --git a/src/script/sign.cpp b/src/script/sign.cpp
index 2d569d674a..e46d9be7d4 100644
--- a/src/script/sign.cpp
+++ b/src/script/sign.cpp
@@ -169,6 +169,17 @@ static bool SignTaprootScript(const SigningProvider& provider, const BaseSignatu
     // <xonly pubkey> OP_CHECKSIG
     if (script.size() == 34 && script[33] == OP_CHECKSIG && script[0] == 0x20) {
         XOnlyPubKey pubkey{Span{script}.subspan(1, 32)};
+
+        KeyOriginInfo info;
+        if (provider.GetKeyOriginByXOnly(pubkey, info)) {
+            auto it = sigdata.taproot_misc_pubkeys.find(pubkey);
+            if (it == sigdata.taproot_misc_pubkeys.end()) {
+                sigdata.taproot_misc_pubkeys.emplace(pubkey, std::make_pair(std::set<uint256>({leaf_hash}), info));
+            } else {
+                it->second.first.insert(leaf_hash);
+            }
+        }
+
         std::vector<unsigned char> sig;
         if (CreateTaprootScriptSig(creator, sigdata, provider, sig, pubkey, leaf_hash, sigversion)) {
             result = Vector(std::move(sig));
@@ -213,6 +224,14 @@ static bool SignTaproot(const SigningProvider& provider, const BaseSignatureCrea
 
     // Try key path spending.
     {
+        KeyOriginInfo info;
+        if (provider.GetKeyOriginByXOnly(spenddata.internal_key, info)) {
+            auto it = sigdata.taproot_misc_pubkeys.find(spenddata.internal_key);
+            if (it == sigdata.taproot_misc_pubkeys.end()) {
+                sigdata.taproot_misc_pubkeys.emplace(spenddata.internal_key, std::make_pair(std::set<uint256>(), info));
+            }
+        }
+
         std::vector<unsigned char> sig;
         if (sigdata.taproot_key_path_sig.size() == 0) {
             if (creator.CreateSchnorrSig(provider, sig, spenddata.internal_key, nullptr, &spenddata.merkle_root, SigVersion::TAPROOT)) {
-- 
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