def sighash(tx, i, prevScript, hashtype = SIGHASH_ALL):
assert isinstance(tx, dict)
i = int(i)
newtx = copy.deepcopy(tx)
for inp in newtx["ins"]:
inp["script"] = b''
s = script.deserialize(prevScript)
s = [x for x in s if x is not script.Opcode.OP_CODESEPARATOR]
newtx["ins"][i]["script"] = script.serialize(s)
if hashtype & 0x1f == SIGHASH_NONE:
newtx["outs"] = []
for inp in range(len(newtx['ins'])):
if inp != i:
newtx['ins'][inp]['sequence'] = 0
elif hashtype & 0x1f == SIGHASH_SINGLE:
newtx["outs"] = newtx["outs"][:i+1]
for out in range(i):
newtx["outs"][out]['value'] = 2**64 - 1
newtx["outs"][out]['script'] = b''
for inp in range(len(newtx['ins'])):
if inp != i:
newtx['ins'][inp]['sequence'] = 0
if hashtype & SIGHASH_ANYONECANPAY != 0:
newtx["ins"] = [newtx["ins"][i]]
hashbytes = convert.int_to_bytes_le(hashtype, 4)
return hashes.hash256(serialize(newtx) + hashbytes)
def b58check_to_bytes(b):
data = b58_to_bytes(b)
assert hashes.hash256(data[:-4])[:4] == data[-4:]
return data[:-4]
def bytes_to_b58check(b):
assert isinstance(b, bytes)
b += hashes.hash256(b)[:4]
return bytes_to_b58(b)
def txhash(tx):
return hashes.hash256(tx)[::-1]
