38 lines
1.1 KiB
Python
38 lines
1.1 KiB
Python
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from eth2spec.test.helpers.keys import privkeys
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from eth2spec.utils.bls import (
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bls_aggregate_signatures,
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bls_sign,
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)
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def sign_shard_attestation(spec, shard_state, beacon_state, block, participants):
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signatures = []
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message_hash = block.core.parent_root
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block_epoch = spec.compute_epoch_of_shard_slot(block.core.slot)
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for validator_index in participants:
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privkey = privkeys[validator_index]
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signatures.append(
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get_attestation_signature(
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spec,
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shard_state,
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beacon_state,
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message_hash,
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block_epoch,
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privkey,
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)
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)
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return bls_aggregate_signatures(signatures)
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def get_attestation_signature(spec, shard_state, beacon_state, message_hash, block_epoch, privkey):
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return bls_sign(
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message_hash=message_hash,
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privkey=privkey,
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domain=spec.get_domain(
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state=beacon_state,
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domain_type=spec.DOMAIN_SHARD_ATTESTER,
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message_epoch=block_epoch,
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)
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)
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