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BIP375: correctly detect SegWit v2+ witness programs

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questfever
2026-08-13 17:29:30 +08:00
parent 60f5b33b0a
commit e726d13ade
2 changed files with 28 additions and 2 deletions
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11
bip-0375/validator/validate_psbt.py
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@@ -250,6 +250,15 @@ def validate_dleq_proof(
return True, None
def is_segwit_v2_or_later(script_pubkey: bytes) -> bool:
"""Return whether script_pubkey is a SegWit v2-v16 witness program."""
return (
4 <= len(script_pubkey) <= 42
and 0x52 <= script_pubkey[0] <= 0x60 # OP_2 through OP_16
and script_pubkey[1] == len(script_pubkey) - 2
)
def validate_input_eligibility(psbt: PSBT) -> Tuple[bool, str]:
"""
Validate input eligibility constraints for silent payments
@@ -268,7 +277,7 @@ def validate_input_eligibility(psbt: PSBT) -> Tuple[bool, str]:
if PSBT_IN_WITNESS_UTXO in input_map:
witness_utxo = input_map[PSBT_IN_WITNESS_UTXO]
script = parse_witness_utxo(witness_utxo)
if script and 0x51 < script[0] <= 0x60: # OP_2 or higher (segwit v2+)
if is_segwit_v2_or_later(script):
return False, f"Input {i} uses segwit version > 1 with silent payments"
# Check SIGHASH_ALL requirement - PSBT_IN_SIGHASH_TYPE is optional, but if set it must be SIGHASH_ALL when SP outputs are present