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[BIP-119] Clarify Endianness of serializations

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This commit is contained in:
Jeremy Rubin 2022-05-10 08:38:37 -07:00
parent c8c8e27c2c
commit ec3688a610
1 changed files with 7 additions and 6 deletions
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13
bip-0119.mediawiki
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@ -217,7 +217,8 @@ def get_default_check_template_precomputed_data(self):
# If there are no scriptSigs we do not need to precompute a hash
if any(inp.scriptSig for inp in self.vin):
result["scriptSigs"] = sha256(b"".join(ser_string(inp.scriptSig) for inp in self.vin))
# The same value is also pre-computed for and defined in BIP-341 and can be shared
# The same value is also pre-computed for and defined in BIP-341 and can be shared.
# each nSequence is packed as 4 byte unsigned integer (little endian)
result["sequences"] = sha256(b"".join(struct.pack("<I", inp.nSequence) for inp in self.vin))
# The same value is also pre-computed for and defined in BIP-341 and can be shared
result["outputs"] = sha256(b"".join(out.serialize() for out in self.vout))
@ -228,21 +229,21 @@ def get_default_check_template_hash(self, nIn, precomputed = None):
if precomputed == None:
precomputed = self.get_default_check_template_precomputed_data()
r = b""
# pack as 4 byte signed integer
# pack as 4 byte signed integer (little endian)
r += struct.pack("<i", self.nVersion)
# pack as 4 byte unsigned integer
# pack as 4 byte unsigned integer (little endian)
r += struct.pack("<I", self.nLockTime)
# we do not include the hash in the case where there is no
# scriptSigs
if "scriptSigs" in precomputed:
r += precomputed["scriptSigs"]
# pack as 4 byte unsigned integer
# pack as 4 byte unsigned integer (little endian)
r += struct.pack("<I", len(self.vin))
r += precomputed["sequences"]
# pack as 4 byte unsigned integer
# pack as 4 byte unsigned integer (little endian)
r += struct.pack("<I", len(self.vout))
r += precomputed["outputs"]
# pack as 4 byte unsigned integer
# pack as 4 byte unsigned integer (little endian)
r += struct.pack("<I", nIn)
return sha256(r)
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