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37 lines
1.3 KiB
Go
37 lines
1.3 KiB
Go
package signing
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import (
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"github.com/pkg/errors"
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types "github.com/prysmaticlabs/eth2-types"
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"github.com/prysmaticlabs/prysm/crypto/bls"
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eth "github.com/prysmaticlabs/prysm/proto/prysm/v1alpha1"
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)
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// Domain returns the domain version for BLS private key to sign and verify.
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//
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// Spec pseudocode definition:
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// def get_domain(state: BeaconState, domain_type: DomainType, epoch: Epoch=None) -> Domain:
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// """
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// Return the signature domain (fork version concatenated with domain type) of a message.
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// """
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// epoch = get_current_epoch(state) if epoch is None else epoch
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// fork_version = state.fork.previous_version if epoch < state.fork.epoch else state.fork.current_version
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// return compute_domain(domain_type, fork_version, state.genesis_validators_root)
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func Domain(fork *eth.Fork, epoch types.Epoch, domainType [bls.DomainByteLength]byte, genesisRoot []byte) ([]byte, error) {
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if fork == nil {
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return []byte{}, errors.New("nil fork or domain type")
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}
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var forkVersion []byte
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if epoch < fork.Epoch {
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forkVersion = fork.PreviousVersion
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} else {
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forkVersion = fork.CurrentVersion
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}
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if len(forkVersion) != 4 {
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return []byte{}, errors.New("fork version length is not 4 byte")
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}
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var forkVersionArray [4]byte
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copy(forkVersionArray[:], forkVersion[:4])
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return ComputeDomain(domainType, forkVersionArray[:], genesisRoot)
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}
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