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Implement Taproot signature hashing (BIP 341)

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This implements the new sighashing scheme from BIP341, with all relevant
whole-transaction values precomputed once and cached.

Includes changes to PrecomputedTransactionData by Pieter Wuille.
This commit is contained in:
Johnson Lau
2020-09-11 14:33:10 -07:00
committed by Pieter Wuille
parent 9eb590894f
commit 5de246ca81
4 changed files with 164 additions and 13 deletions
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5
src/script/script.h
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@@ -44,6 +44,11 @@ static const unsigned int LOCKTIME_THRESHOLD = 500000000; // Tue Nov 5 00:53:20
// SEQUENCE_FINAL).
static const uint32_t LOCKTIME_MAX = 0xFFFFFFFFU;
// Tag for input annex. If there are at least two witness elements for a transaction input,
// and the first byte of the last element is 0x50, this last element is called annex, and
// has meanings independent of the script
static constexpr unsigned int ANNEX_TAG = 0x50;
template <typename T>
std::vector<unsigned char> ToByteVector(const T& in)
{