45 lines
1.5 KiB
Python
45 lines
1.5 KiB
Python
from eth2spec.test.helpers.keys import privkeys
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from eth2spec.utils.bls import bls_sign, bls_aggregate_signatures
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from eth2spec.utils.hash_function import hash
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def get_valid_early_derived_secret_reveal(spec, state, epoch=None):
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current_epoch = spec.get_current_epoch(state)
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revealed_index = spec.get_active_validator_indices(state, current_epoch)[-1]
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masker_index = spec.get_active_validator_indices(state, current_epoch)[0]
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if epoch is None:
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epoch = current_epoch + spec.CUSTODY_PERIOD_TO_RANDAO_PADDING
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# Generate the secret that is being revealed
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reveal = bls_sign(
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message_hash=spec.hash_tree_root(spec.Epoch(epoch)),
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privkey=privkeys[revealed_index],
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domain=spec.get_domain(
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state=state,
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domain_type=spec.DOMAIN_RANDAO,
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message_epoch=epoch,
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),
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)
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# Generate the mask (any random 32 bytes that don't reveal the masker's secret will do)
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mask = hash(reveal)
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# Generate masker's signature on the mask
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masker_signature = bls_sign(
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message_hash=mask,
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privkey=privkeys[masker_index],
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domain=spec.get_domain(
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state=state,
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domain_type=spec.DOMAIN_RANDAO,
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message_epoch=epoch,
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),
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)
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masked_reveal = bls_aggregate_signatures([reveal, masker_signature])
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return spec.EarlyDerivedSecretReveal(
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revealed_index=revealed_index,
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epoch=epoch,
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reveal=masked_reveal,
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masker_index=masker_index,
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mask=mask,
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)
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