| 648 | # Note that this corresponds to sigversion == 1 in EvalScript, which is used |
| 649 | # for version 0 witnesses and all the FORKID transactions. |
| 650 | def SegwitVersion1SignatureHash(script, txTo, inIdx, hashtype, amount): |
| 651 | |
| 652 | hashPrevouts = 0 |
| 653 | hashSequence = 0 |
| 654 | hashOutputs = 0 |
| 655 | |
| 656 | if not (hashtype & SIGHASH_ANYONECANPAY): |
| 657 | serialize_prevouts = bytes() |
| 658 | for i in txTo.vin: |
| 659 | serialize_prevouts += i.prevout.serialize() |
| 660 | hashPrevouts = uint256_from_str(hash256(serialize_prevouts)) |
| 661 | |
| 662 | if (not (hashtype & SIGHASH_ANYONECANPAY) and (hashtype & 0x1f) != SIGHASH_SINGLE and (hashtype & 0x1f) != SIGHASH_NONE): |
| 663 | serialize_sequence = bytes() |
| 664 | for i in txTo.vin: |
| 665 | serialize_sequence += struct.pack("<I", i.nSequence) |
| 666 | hashSequence = uint256_from_str(hash256(serialize_sequence)) |
| 667 | |
| 668 | if ((hashtype & 0x1f) != SIGHASH_SINGLE and (hashtype & 0x1f) != SIGHASH_NONE): |
| 669 | serialize_outputs = bytes() |
| 670 | for o in txTo.vout: |
| 671 | serialize_outputs += o.serialize() |
| 672 | hashOutputs = uint256_from_str(hash256(serialize_outputs)) |
| 673 | elif ((hashtype & 0x1f) == SIGHASH_SINGLE and inIdx < len(txTo.vout)): |
| 674 | serialize_outputs = txTo.vout[inIdx].serialize() |
| 675 | hashOutputs = uint256_from_str(hash256(serialize_outputs)) |
| 676 | |
| 677 | if hashtype & SIGHASH_FORKID: |
| 678 | hashtype |= FORKID_BTG << 8 |
| 679 | |
| 680 | ss = bytes() |
| 681 | ss += struct.pack("<i", txTo.nVersion) |
| 682 | ss += ser_uint256(hashPrevouts) |
| 683 | ss += ser_uint256(hashSequence) |
| 684 | ss += txTo.vin[inIdx].prevout.serialize() |
| 685 | ss += ser_string(script) |
| 686 | ss += struct.pack("<q", amount) |
| 687 | ss += struct.pack("<I", txTo.vin[inIdx].nSequence) |
| 688 | ss += ser_uint256(hashOutputs) |
| 689 | ss += struct.pack("<i", txTo.nLockTime) |
| 690 | ss += struct.pack("<I", hashtype) |
| 691 | |
| 692 | return hash256(ss) |