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Explicitly validate public key when processing Deposit #2987

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Explicitly validate public key when processing Deposit #2987

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77f6493
Explicitly validate public key when processing Deposit
Nashatyrev Sep 8, 2022
618dd30
Add KeyValidate to bls.py
Nashatyrev Sep 8, 2022
7ea688c
Fix py formatting
Nashatyrev Sep 9, 2022
51ba721
Fallback to py_ecc as milagro_bls_binding has no KeyValidate binding
Nashatyrev Sep 9, 2022
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4 changes: 4 additions & 0 deletions specs/phase0/beacon-chain.md
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Original file line number Diff line number Diff line change
Expand Up @@ -1868,6 +1868,10 @@ def process_deposit(state: BeaconState, deposit: Deposit) -> None:
amount = deposit.data.amount
validator_pubkeys = [v.pubkey for v in state.validators]
if pubkey not in validator_pubkeys:
# Validate the public key which is not checked by the deposit contract
if not bls.KeyValidate(pubkey):
return

# Verify the deposit signature (proof of possession) which is not checked by the deposit contract
deposit_message = DepositMessage(
pubkey=deposit.data.pubkey,
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10 changes: 10 additions & 0 deletions tests/core/pyspec/eth2spec/utils/bls.py
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Expand Up @@ -107,6 +107,16 @@ def Sign(SK, message):
return bls.Sign(SK.to_bytes(32, 'big'), message)


@only_with_bls(alt_return=True)
def KeyValidate(pubkey):
try:
result = bls.KeyValidate(pubkey)
except Exception:
result = False
finally:
return result


@only_with_bls(alt_return=STUB_COORDINATES)
def signature_to_G2(signature):
return _signature_to_G2(signature)
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