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script: (optimization) introduce sighash midstate caching

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This commit is contained in:
Pieter Wuille
2025-04-25 13:31:18 -04:00
parent 8f3ddb0bcc
commit 92af9f74d7
2 changed files with 62 additions and 3 deletions
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22
src/script/interpreter.h
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@@ -239,8 +239,27 @@ extern const HashWriter HASHER_TAPSIGHASH; //!< Hasher with tag "TapSighash" pre
extern const HashWriter HASHER_TAPLEAF; //!< Hasher with tag "TapLeaf" pre-fed to it.
extern const HashWriter HASHER_TAPBRANCH; //!< Hasher with tag "TapBranch" pre-fed to it.
/** Data structure to cache SHA256 midstates for the ECDSA sighash calculations
* (bare, P2SH, P2WPKH, P2WSH). */
class SigHashCache
{
/** For each sighash mode (ALL, SINGLE, NONE, ALL|ANYONE, SINGLE|ANYONE, NONE|ANYONE),
* optionally store a scriptCode which the hash is for, plus a midstate for the SHA256
* computation just before adding the hash_type itself. */
std::optional<std::pair<CScript, HashWriter>> m_cache_entries[6];
/** Given a hash_type, find which of the 6 cache entries is to be used. */
int CacheIndex(int32_t hash_type) const noexcept;
public:
/** Load into writer the SHA256 midstate if found in this cache. */
[[nodiscard]] bool Load(int32_t hash_type, const CScript& script_code, HashWriter& writer) const noexcept;
/** Store into this cache object the provided SHA256 midstate. */
void Store(int32_t hash_type, const CScript& script_code, const HashWriter& writer) noexcept;
};
template <class T>
uint256 SignatureHash(const CScript& scriptCode, const T& txTo, unsigned int nIn, int32_t nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = nullptr);
uint256 SignatureHash(const CScript& scriptCode, const T& txTo, unsigned int nIn, int32_t nHashType, const CAmount& amount, SigVersion sigversion, const PrecomputedTransactionData* cache = nullptr, SigHashCache* sighash_cache = nullptr);
class BaseSignatureChecker
{
@@ -289,6 +308,7 @@ private:
unsigned int nIn;
const CAmount amount;
const PrecomputedTransactionData* txdata;
mutable SigHashCache m_sighash_cache;
protected:
virtual bool VerifyECDSASignature(const std::vector<unsigned char>& vchSig, const CPubKey& vchPubKey, const uint256& sighash) const;