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Add XOnlyPubKey::CreateTapTweak

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This commit is contained in:
Pieter Wuille 2021-05-23 18:32:30 -07:00
parent 2fbfb1becb
commit 5f6cc8daa8
2 changed files with 22 additions and 0 deletions
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18
src/pubkey.cpp
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@ -209,6 +209,24 @@ bool XOnlyPubKey::CheckTapTweak(const XOnlyPubKey& internal, const uint256& merk
return secp256k1_xonly_pubkey_tweak_add_check(secp256k1_context_verify, m_keydata.begin(), parity, &internal_key, tweak.begin()); return secp256k1_xonly_pubkey_tweak_add_check(secp256k1_context_verify, m_keydata.begin(), parity, &internal_key, tweak.begin());
} }
std::optional<std::pair<XOnlyPubKey, bool>> XOnlyPubKey::CreateTapTweak(const uint256* merkle_root) const
{
secp256k1_xonly_pubkey base_point;
if (!secp256k1_xonly_pubkey_parse(secp256k1_context_verify, &base_point, data())) return std::nullopt;
secp256k1_pubkey out;
uint256 tweak = ComputeTapTweakHash(merkle_root);
if (!secp256k1_xonly_pubkey_tweak_add(secp256k1_context_verify, &out, &base_point, tweak.data())) return std::nullopt;
int parity = -1;
std::pair<XOnlyPubKey, bool> ret;
secp256k1_xonly_pubkey out_xonly;
if (!secp256k1_xonly_pubkey_from_pubkey(secp256k1_context_verify, &out_xonly, &parity, &out)) return std::nullopt;
secp256k1_xonly_pubkey_serialize(secp256k1_context_verify, ret.first.begin(), &out_xonly);
assert(parity == 0 || parity == 1);
ret.second = parity;
return ret;
}
bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const { bool CPubKey::Verify(const uint256 &hash, const std::vector<unsigned char>& vchSig) const {
if (!IsValid()) if (!IsValid())
return false; return false;

4
src/pubkey.h
View file

@ -13,6 +13,7 @@
#include <uint256.h> #include <uint256.h>
#include <cstring> #include <cstring>
#include <optional>
#include <vector> #include <vector>
const unsigned int BIP32_EXTKEY_SIZE = 74; const unsigned int BIP32_EXTKEY_SIZE = 74;
@ -251,6 +252,9 @@ public:
* Merkle root, and parity. */ * Merkle root, and parity. */
bool CheckTapTweak(const XOnlyPubKey& internal, const uint256& merkle_root, bool parity) const; bool CheckTapTweak(const XOnlyPubKey& internal, const uint256& merkle_root, bool parity) const;
/** Construct a Taproot tweaked output point with this point as internal key. */
std::optional<std::pair<XOnlyPubKey, bool>> CreateTapTweak(const uint256* merkle_root) const;
const unsigned char& operator[](int pos) const { return *(m_keydata.begin() + pos); } const unsigned char& operator[](int pos) const { return *(m_keydata.begin() + pos); }
const unsigned char* data() const { return m_keydata.begin(); } const unsigned char* data() const { return m_keydata.begin(); }
static constexpr size_t size() { return decltype(m_keydata)::size(); } static constexpr size_t size() { return decltype(m_keydata)::size(); }