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domain.go
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domain.go
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package signing
import (
"github.com/pkg/errors"
"github.com/prysmaticlabs/prysm/v4/consensus-types/primitives"
"github.com/prysmaticlabs/prysm/v4/crypto/bls"
eth "github.com/prysmaticlabs/prysm/v4/proto/prysm/v1alpha1"
)
// Domain returns the domain version for BLS private key to sign and verify.
//
// Spec pseudocode definition:
//
// def get_domain(state: BeaconState, domain_type: DomainType, epoch: Epoch=None) -> Domain:
// """
// Return the signature domain (fork version concatenated with domain type) of a message.
// """
// epoch = get_current_epoch(state) if epoch is None else epoch
// fork_version = state.fork.previous_version if epoch < state.fork.epoch else state.fork.current_version
// return compute_domain(domain_type, fork_version, state.genesis_validators_root)
func Domain(fork *eth.Fork, epoch primitives.Epoch, domainType [bls.DomainByteLength]byte, genesisRoot []byte) ([]byte, error) {
if fork == nil {
return []byte{}, errors.New("nil fork or domain type")
}
var forkVersion []byte
if epoch < fork.Epoch {
forkVersion = fork.PreviousVersion
} else {
forkVersion = fork.CurrentVersion
}
if len(forkVersion) != 4 {
return []byte{}, errors.New("fork version length is not 4 byte")
}
var forkVersionArray [4]byte
copy(forkVersionArray[:], forkVersion[:4])
return ComputeDomain(domainType, forkVersionArray[:], genesisRoot)
}