diff options
| -rw-r--r-- | bip-0119.mediawiki | 39 |
1 files changed, 34 insertions, 5 deletions
diff --git a/bip-0119.mediawiki b/bip-0119.mediawiki index 99a9150..c2d9912 100644 --- a/bip-0119.mediawiki +++ b/bip-0119.mediawiki @@ -212,6 +212,34 @@ including hashes of the scriptsigs, sequences, and outputs. See the section optimization. <source lang="python"> + +def ser_compact_size(l): + r = b"" + if l < 253: + # Serialize as unsigned char + r = struct.pack("B", l) + elif l < 0x10000: + # Serialize as unsigned char 253 followed by unsigned 2 byte integer (little endian) + r = struct.pack("<BH", 253, l) + elif l < 0x100000000: + # Serialize as unsigned char 254 followed by unsigned 4 byte integer (little endian) + r = struct.pack("<BI", 254, l) + else: + # Serialize as unsigned char 255 followed by unsigned 8 byte integer (little endian) + r = struct.pack("<BQ", 255, l) + return r + +def ser_string(s): + return ser_compact_size(len(s)) + s + +class CTxOut: + def serialize(self): + r = b"" + # serialize as signed 8 byte integer (little endian) + r += struct.pack("<q", self.nValue) + r += ser_string(self.scriptPubKey) + return r + def get_default_check_template_precomputed_data(self): result = {} # If there are no scriptSigs we do not need to precompute a hash @@ -221,6 +249,7 @@ def get_default_check_template_precomputed_data(self): # 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 + # See class CTxOut above for details. result["outputs"] = sha256(b"".join(out.serialize() for out in self.vout)) return result @@ -229,21 +258,21 @@ 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 (little endian) + # Serialize as 4 byte signed integer (little endian) r += struct.pack("<i", self.nVersion) - # pack as 4 byte unsigned integer (little endian) + # Serialize 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 (little endian) + # Serialize as 4 byte unsigned integer (little endian) r += struct.pack("<I", len(self.vin)) r += precomputed["sequences"] - # pack as 4 byte unsigned integer (little endian) + # Serialize as 4 byte unsigned integer (little endian) r += struct.pack("<I", len(self.vout)) r += precomputed["outputs"] - # pack as 4 byte unsigned integer (little endian) + # Serialize as 4 byte unsigned integer (little endian) r += struct.pack("<I", nIn) return sha256(r) </source> |