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Update BIP-119 to include python reference hash / link BIP-341

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Jeremy Rubin 2022-03-29 14:51:43 -07:00 committed by GitHub
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@ -203,7 +203,18 @@ Where
return GetDefaultCheckTemplateVerifyHash(current_tx, current_input_index) == uint256(hash);
}
The hash is computed as follows:
The hash is computed as follows, where the outputs_hash and sequences_hash are computed as defined in BIP-341.
/** Compute the (single) SHA256 of the concatenation of all scriptSigs in a tx. */
template <class T>
uint256 GetScriptSigsSHA256(const T& txTo)
{
CHashWriter ss(SER_GETHASH, 0);
for (const auto& in : txTo.vin) {
ss << in.scriptSig;
}
return ss.GetSHA256();
}
// not DoS safe, for reference/testing!
uint256 GetDefaultCheckTemplateVerifyHash(const CTransaction& tx, uint32_t input_index) {
return GetDefaultCheckTemplateVerifyHash(tx, GetOutputsSHA256(tx), GetSequenceSHA256(tx), input_index);
@ -244,6 +255,21 @@ The hash is computed as follows:
return h.GetSHA256();
}
In python, this can be written as (but note this implementation is DoS-able).
def get_default_check_template_hash(self, nIn):
r = b""
r += struct.pack("<i", self.nVersion)
r += struct.pack("<I", self.nLockTime)
if any(inp.scriptSig for inp in self.vin):
r += sha256(b"".join(ser_string(inp.scriptSig) for inp in self.vin))
r += struct.pack("<I", len(self.vin))
r += sha256(b"".join(struct.pack("<I", inp.nSequence) for inp in self.vin))
r += struct.pack("<I", len(self.vout))
r += sha256(b"".join(out.serialize() for out in self.vout))
r += struct.pack("<I", nIn)
return sha256(r)
A PayToBareDefaultCheckTemplateVerifyHash output matches the following template:
bool CScript::IsPayToBareDefaultCheckTemplateVerifyHash() const