def SignatureHashForkId(script, txTo, inIdx, hashtype, amount):
hashPrevouts = None
hashSequence = None
hashOutputs = None
if not (hashtype & SIGHASH_ANYONECANPAY):
serialize_prevouts = bytes()
for i in txTo.vin:
serialize_prevouts += i.prevout.serialize()
hashPrevouts = bitcoin.core.Hash(serialize_prevouts) # uint256_from_str(hash256(serialize_prevouts))
if (not (hashtype & SIGHASH_ANYONECANPAY) and (hashtype & 0x1f) != SIGHASH_SINGLE and (hashtype & 0x1f) != SIGHASH_NONE):
serialize_sequence = bytes()
for i in txTo.vin:
serialize_sequence += struct.pack("<I", i.nSequence)
hashSequence = bitcoin.core.Hash(serialize_sequence) # uint256_from_str(hash256(serialize_sequence))
if ((hashtype & 0x1f) != SIGHASH_SINGLE and (hashtype & 0x1f) != SIGHASH_NONE):
serialize_outputs = bytes()
for o in txTo.vout:
serialize_outputs += o.serialize()
hashOutputs = bitcoin.core.Hash(serialize_outputs)
elif ((hashtype & 0x1f) == SIGHASH_SINGLE and inIdx < len(txTo.vout)):
serialize_outputs = txTo.vout[inIdx].serialize()
hashOutputs = bitcoin.core.Hash(serialize_outputs)
ss = bytes()
ss += struct.pack("<i", txTo.nVersion)
ss += hashPrevouts
ss += hashSequence
ss += txTo.vin[inIdx].prevout.serialize()
ss += ( VarIntSerializer.serialize(len(script)) + script )
ss += struct.pack("<q", amount)
ss += struct.pack("<I", txTo.vin[inIdx].nSequence)
ss += hashOutputs
ss += struct.pack("<i", txTo.nLockTime)
ss += struct.pack("<I", hashtype)
return bitcoin.core.Hash(ss)
