1 files changed, 13 insertions, 1 deletions
diff --git a/src/key.h b/src/key.h
index 206322956c..d47e54800c 100644
--- a/src/key.h
+++ b/src/key.h
@@ -128,6 +128,18 @@ public:
      */
     bool SignCompact(const uint256& hash, std::vector<unsigned char>& vchSig) const;
 
+    /**
+     * Create a BIP-340 Schnorr signature, for the xonly-pubkey corresponding to *this,
+     * optionally tweaked by *merkle_root. Additional nonce entropy can be provided through
+     * aux.
+     *
+     * When merkle_root is not nullptr, this results in a signature with a modified key as
+     * specified in BIP341:
+     * - If merkle_root->IsNull(): key + H_TapTweak(pubkey)*G
+     * - Otherwise:                key + H_TapTweak(pubkey || *merkle_root)
+     */
+    bool SignSchnorr(const uint256& hash, Span<unsigned char> sig, const uint256* merkle_root = nullptr, const uint256* aux = nullptr) const;
+
     //! Derive BIP32 child key.
     bool Derive(CKey& keyChild, ChainCode &ccChild, unsigned int nChild, const ChainCode& cc) const;
 
@@ -151,7 +163,7 @@ struct CExtKey {
     friend bool operator==(const CExtKey& a, const CExtKey& b)
     {
         return a.nDepth == b.nDepth &&
-            memcmp(&a.vchFingerprint[0], &b.vchFingerprint[0], sizeof(vchFingerprint)) == 0 &&
+            memcmp(a.vchFingerprint, b.vchFingerprint, sizeof(vchFingerprint)) == 0 &&
             a.nChild == b.nChild &&
             a.chaincode == b.chaincode &&
             a.key == b.key;