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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());
}
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 {
if (!IsValid())
return false;