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-rw-r--r--src/script/sigcache.h21
1 files changed, 21 insertions, 0 deletions
diff --git a/src/script/sigcache.h b/src/script/sigcache.h
index 60690583de..55cec4cc8d 100644
--- a/src/script/sigcache.h
+++ b/src/script/sigcache.h
@@ -19,6 +19,27 @@ static const int64_t MAX_MAX_SIG_CACHE_SIZE = 16384;
class CPubKey;
+/**
+ * We're hashing a nonce into the entries themselves, so we don't need extra
+ * blinding in the set hash computation.
+ *
+ * This may exhibit platform endian dependent behavior but because these are
+ * nonced hashes (random) and this state is only ever used locally it is safe.
+ * All that matters is local consistency.
+ */
+class SignatureCacheHasher
+{
+public:
+ template <uint8_t hash_select>
+ uint32_t operator()(const uint256& key) const
+ {
+ static_assert(hash_select <8, "SignatureCacheHasher only has 8 hashes available.");
+ uint32_t u;
+ std::memcpy(&u, key.begin()+4*hash_select, 4);
+ return u;
+ }
+};
+
class CachingTransactionSignatureChecker : public TransactionSignatureChecker
{
private: