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BIP-375: add output scripts validation

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Add support for computing bip352 output scripts
Extract ECDH shares and public key from PSBT and aggregate both if necessary
Refactor validate_ecdh_coverage to use collect_input_ecdh_and_pubkey
This commit is contained in:
macgyver13
2026-02-23 10:20:11 -05:00
parent ab30224051
commit fb105b7e51
3 changed files with 175 additions and 15 deletions
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47
bip-0375/validator/inputs.py
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@@ -8,6 +8,7 @@ from typing import Optional, Tuple
from deps.bitcoin_test.messages import CTransaction, CTxOut, from_binary
from deps.bitcoin_test.psbt import (
PSBT,
PSBT_IN_BIP32_DERIVATION,
PSBT_IN_NON_WITNESS_UTXO,
PSBT_IN_OUTPUT_INDEX,
@@ -17,7 +18,51 @@ from deps.bitcoin_test.psbt import (
)
from secp256k1lab.secp256k1 import GE
from .psbt_bip375 import BIP375PSBTMap
from .psbt_bip375 import BIP375PSBTMap, PSBT_GLOBAL_SP_ECDH_SHARE, PSBT_IN_SP_ECDH_SHARE
def collect_input_ecdh_and_pubkey(
psbt: PSBT, scan_key: bytes
) -> Tuple[Optional[bytes], Optional[bytes]]:
"""
Collect combined ECDH share and summed pubkey for a scan key.
Checks global ECDH share first, falls back to per-input shares.
Returns (ecdh_share_bytes, summed_pubkey_bytes) or (None, None).
"""
# Check for global ECDH share
summed_pubkey = None
ecdh_share = psbt.g.get_by_key(PSBT_GLOBAL_SP_ECDH_SHARE, scan_key)
if ecdh_share:
summed_pubkey = None
for input_map in psbt.i:
pubkey = pubkey_from_eligible_input(input_map)
if pubkey is not None:
summed_pubkey = (
pubkey if summed_pubkey is None else summed_pubkey + pubkey
)
if summed_pubkey:
return ecdh_share, summed_pubkey.to_bytes_compressed()
# Check for per-input ECDH shares
combined_ecdh = None
for input_map in psbt.i:
input_ecdh = input_map.get_by_key(PSBT_IN_SP_ECDH_SHARE, scan_key)
if input_ecdh:
ecdh_point = GE.from_bytes(input_ecdh)
combined_ecdh = (
ecdh_point if combined_ecdh is None else combined_ecdh + ecdh_point
)
pubkey = pubkey_from_eligible_input(input_map)
if pubkey is not None:
summed_pubkey = (
pubkey if summed_pubkey is None else summed_pubkey + pubkey
)
if combined_ecdh and summed_pubkey:
return combined_ecdh.to_bytes_compressed(), summed_pubkey.to_bytes_compressed()
return None, None
def pubkey_from_eligible_input(input_map: BIP375PSBTMap) -> Optional[GE]: