def compute_domain(signature_domain: SignatureDomain,
fork_version: Version = default_version) -> Domain:
"""
NOTE: we deviate from the spec here by taking the enum ``SignatureDomain`` and
converting before creating the domain.
"""
domain_type = signature_domain_to_domain_type(signature_domain)
return Domain(domain_type + fork_version)
def sign(duty: Duty, operation: Operation,
private_key_provider: PrivateKeyProvider) -> BLSSignature:
message = operation.hash_tree_root
private_key = private_key_provider(duty.validator_public_key)
# TODO use correct ``domain`` value
# NOTE currently only uses part of the domain value
# need to get fork from the state and compute the full domain value locally
domain = Domain(b"\x00" * 4 +
signature_domain_to_domain_type(duty.signature_domain))
return bls.sign(message, private_key, domain)
def _randao_provider_of_epoch_signature(
public_key: BLSPubkey, epoch: Epoch
) -> BLSSignature:
private_key = private_key_provider(public_key)
# TODO: fix how we get the signing root
message = Hash32(epoch.to_bytes(32, byteorder="big"))
domain = Domain(
b"\x00" * 4 + signature_domain_to_domain_type(SignatureDomain.DOMAIN_RANDAO)
)
sig = bls.sign(message, private_key, domain)
return sig