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8219af46e4
* Move slot epoch from core to time pkg * Fix fuzz Co-authored-by: prylabs-bulldozer[bot] <58059840+prylabs-bulldozer[bot]@users.noreply.github.com>
86 lines
3.1 KiB
Go
86 lines
3.1 KiB
Go
package blocks
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import (
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"context"
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"github.com/pkg/errors"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/time"
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"github.com/prysmaticlabs/prysm/beacon-chain/state"
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"github.com/prysmaticlabs/prysm/config/params"
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"github.com/prysmaticlabs/prysm/crypto/hash"
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"github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1/block"
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)
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// ProcessRandao checks the block proposer's
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// randao commitment and generates a new randao mix to update
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// in the beacon state's latest randao mixes slice.
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//
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// Spec pseudocode definition:
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// def process_randao(state: BeaconState, body: BeaconBlockBody) -> None:
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// epoch = get_current_epoch(state)
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// # Verify RANDAO reveal
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// proposer = state.validators[get_beacon_proposer_index(state)]
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// signing_root = compute_signing_root(epoch, get_domain(state, DOMAIN_RANDAO))
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// assert bls.Verify(proposer.pubkey, signing_root, body.randao_reveal)
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// # Mix in RANDAO reveal
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// mix = xor(get_randao_mix(state, epoch), hash(body.randao_reveal))
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// state.randao_mixes[epoch % EPOCHS_PER_HISTORICAL_VECTOR] = mix
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func ProcessRandao(
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ctx context.Context,
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beaconState state.BeaconState,
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b block.SignedBeaconBlock,
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) (state.BeaconState, error) {
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if err := helpers.VerifyNilBeaconBlock(b); err != nil {
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return nil, err
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}
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body := b.Block().Body()
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buf, proposerPub, domain, err := randaoSigningData(ctx, beaconState)
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if err != nil {
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return nil, err
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}
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if err := verifySignature(buf, proposerPub, body.RandaoReveal(), domain); err != nil {
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return nil, errors.Wrap(err, "could not verify block randao")
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}
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beaconState, err = ProcessRandaoNoVerify(beaconState, body.RandaoReveal())
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if err != nil {
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return nil, errors.Wrap(err, "could not process randao")
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}
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return beaconState, nil
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}
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// ProcessRandaoNoVerify generates a new randao mix to update
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// in the beacon state's latest randao mixes slice.
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//
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// Spec pseudocode definition:
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// # Mix it in
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// state.latest_randao_mixes[get_current_epoch(state) % LATEST_RANDAO_MIXES_LENGTH] = (
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// xor(get_randao_mix(state, get_current_epoch(state)),
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// hash(body.randao_reveal))
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// )
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func ProcessRandaoNoVerify(
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beaconState state.BeaconState,
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randaoReveal []byte,
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) (state.BeaconState, error) {
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currentEpoch := time.SlotToEpoch(beaconState.Slot())
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// If block randao passed verification, we XOR the state's latest randao mix with the block's
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// randao and update the state's corresponding latest randao mix value.
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latestMixesLength := params.BeaconConfig().EpochsPerHistoricalVector
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latestMixSlice, err := beaconState.RandaoMixAtIndex(uint64(currentEpoch % latestMixesLength))
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if err != nil {
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return nil, err
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}
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blockRandaoReveal := hash.Hash(randaoReveal)
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if len(blockRandaoReveal) != len(latestMixSlice) {
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return nil, errors.New("blockRandaoReveal length doesnt match latestMixSlice length")
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}
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for i, x := range blockRandaoReveal {
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latestMixSlice[i] ^= x
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}
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if err := beaconState.UpdateRandaoMixesAtIndex(uint64(currentEpoch%latestMixesLength), latestMixSlice); err != nil {
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return nil, err
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}
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return beaconState, nil
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}
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