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Add XOnlyPubKey::CreateTapTweak

Browse source 
https://github.com/bitcoin/bitcoin/pull/22051 (6/9)

Modified to use the old-style Optional rather than std::optional
This commit is contained in:
Andrew Poelstra 2021-08-19 13:22:11 +00:00 • committed by sanket1729
parent 68961ca60e
commit 8a20fbe8a6
2 changed files with 23 additions and 0 deletions
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18
src/pubkey.cpp
View file

@ -222,6 +222,24 @@ bool CPubKey::TweakMulVerify(const CPubKey& untweaked, const uint256& tweak) con
return *this == CPubKey(out_pk, out_pk + out_len);
}
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 nullopt;
secp256k1_pubkey out;
uint256 tweak = ComputeTapTweakHash(merkle_root);
if (!secp256k1_xonly_pubkey_tweak_add(secp256k1_context_verify, &out, &base_point, tweak.data())) return 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 nullopt;
secp256k1_xonly_pubkey_serialize(secp256k1_context_verify, ret.first.data(), &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;

5
src/pubkey.h
View file

@ -8,6 +8,7 @@
#define BITCOIN_PUBKEY_H
#include <hash.h>
#include <optional.h>
#include <serialize.h>
#include <span.h>
#include <uint256.h>
@ -248,6 +249,9 @@ public:
* Merkle root, and parity. */
bool CheckTapTweak(const XOnlyPubKey& internal, const uint256& merkle_root, bool parity) const;
/** Construct a Taproot tweaked output point with this point as internal key. */
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* data() const { return m_keydata.begin(); }
static constexpr size_t size() { return decltype(m_keydata)::size(); }
@ -255,6 +259,7 @@ public:
const unsigned char* end() const { return m_keydata.end(); }
unsigned char* begin() { return m_keydata.begin(); }
unsigned char* end() { return m_keydata.end(); }
unsigned char* data() { return m_keydata.begin(); }
bool operator==(const XOnlyPubKey& other) const { return m_keydata == other.m_keydata; }
bool operator!=(const XOnlyPubKey& other) const { return m_keydata != other.m_keydata; }
bool operator<(const XOnlyPubKey& other) const { return m_keydata < other.m_keydata; }