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5a66807989
* First take at updating everything to v5 * Patch gRPC gateway to use prysm v5 Fix patch * Update go ssz --------- Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>
53 lines
1.9 KiB
Go
53 lines
1.9 KiB
Go
package helpers
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import (
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"github.com/prysmaticlabs/prysm/v5/beacon-chain/state"
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"github.com/prysmaticlabs/prysm/v5/config/params"
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"github.com/prysmaticlabs/prysm/v5/consensus-types/primitives"
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"github.com/prysmaticlabs/prysm/v5/crypto/bls"
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"github.com/prysmaticlabs/prysm/v5/crypto/hash"
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"github.com/prysmaticlabs/prysm/v5/encoding/bytesutil"
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)
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// Seed returns the randao seed used for shuffling of a given epoch.
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//
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// Spec pseudocode definition:
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//
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// def get_seed(state: BeaconState, epoch: Epoch, domain_type: DomainType) -> Bytes32:
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// """
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// Return the seed at ``epoch``.
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// """
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// mix = get_randao_mix(state, Epoch(epoch + EPOCHS_PER_HISTORICAL_VECTOR - MIN_SEED_LOOKAHEAD - 1)) # Avoid underflow
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// return hash(domain_type + uint_to_bytes(epoch) + mix)
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func Seed(state state.ReadOnlyBeaconState, epoch primitives.Epoch, domain [bls.DomainByteLength]byte) ([32]byte, error) {
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// See https://github.com/ethereum/consensus-specs/pull/1296 for
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// rationale on why offset has to look down by 1.
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lookAheadEpoch := epoch + params.BeaconConfig().EpochsPerHistoricalVector -
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params.BeaconConfig().MinSeedLookahead - 1
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randaoMix, err := RandaoMix(state, lookAheadEpoch)
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if err != nil {
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return [32]byte{}, err
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}
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seed := append(domain[:], bytesutil.Bytes8(uint64(epoch))...)
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seed = append(seed, randaoMix...)
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seed32 := hash.Hash(seed)
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return seed32, nil
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}
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// RandaoMix returns the randao mix (xor'ed seed)
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// of a given slot. It is used to shuffle validators.
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//
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// Spec pseudocode definition:
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//
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// def get_randao_mix(state: BeaconState, epoch: Epoch) -> Bytes32:
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// """
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// Return the randao mix at a recent ``epoch``.
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// """
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// return state.randao_mixes[epoch % EPOCHS_PER_HISTORICAL_VECTOR]
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func RandaoMix(state state.ReadOnlyBeaconState, epoch primitives.Epoch) ([]byte, error) {
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return state.RandaoMixAtIndex(uint64(epoch % params.BeaconConfig().EpochsPerHistoricalVector))
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}
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