prysm-pulse/shared/keystore/deposit_input.go
Raul Jordan 37cba662f1
Run Gofmt on Repo (#5541)
* toggle flags
* Merge branch 'master' of github.com:prysmaticlabs/prysm
* Merge branch 'master' of github.com:prysmaticlabs/prysm
* run gofmt
* Merge branch 'master' into lint-repo
2020-04-20 16:35:04 +00:00

67 lines
2.7 KiB
Go

package keystore
import (
ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
"github.com/prysmaticlabs/go-ssz"
"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
"github.com/prysmaticlabs/prysm/shared/hashutil"
"github.com/prysmaticlabs/prysm/shared/params"
)
// DepositInput for a given key. This input data can be used to when making a
// validator deposit. The input data includes a proof of possession field
// signed by the deposit key.
//
// Spec details about general deposit workflow:
// To submit a deposit:
//
// - Pack the validator's initialization parameters into deposit_data, a Deposit_Data SSZ object.
// - Let amount be the amount in Gwei to be deposited by the validator where MIN_DEPOSIT_AMOUNT <= amount <= MAX_EFFECTIVE_BALANCE.
// - Set deposit_data.amount = amount.
// - Let signature be the result of bls_sign of the signing_root(deposit_data) with domain=compute_domain(DOMAIN_DEPOSIT). (Deposits are valid regardless of fork version, compute_domain will default to zeroes there).
// - Send a transaction on the Ethereum 1.0 chain to DEPOSIT_CONTRACT_ADDRESS executing def deposit(pubkey: bytes[48], withdrawal_credentials: bytes[32], signature: bytes[96]) along with a deposit of amount Gwei.
//
// See: https://github.com/ethereum/eth2.0-specs/blob/master/specs/validator/0_beacon-chain-validator.md#submit-deposit
func DepositInput(depositKey *Key, withdrawalKey *Key, amountInGwei uint64) (*ethpb.Deposit_Data, [32]byte, error) {
di := &ethpb.Deposit_Data{
PublicKey: depositKey.PublicKey.Marshal(),
WithdrawalCredentials: withdrawalCredentialsHash(withdrawalKey),
Amount: amountInGwei,
}
sr, err := ssz.SigningRoot(di)
if err != nil {
return nil, [32]byte{}, err
}
domain, err := helpers.ComputeDomain(params.BeaconConfig().DomainDeposit, nil /*forkVersion*/, nil /*genesisValidatorsRoot*/)
if err != nil {
return nil, [32]byte{}, err
}
root, err := ssz.HashTreeRoot(&pb.SigningRoot{ObjectRoot: sr[:], Domain: domain})
if err != nil {
return nil, [32]byte{}, err
}
di.Signature = depositKey.SecretKey.Sign(root[:]).Marshal()
dr, err := ssz.HashTreeRoot(di)
if err != nil {
return nil, [32]byte{}, err
}
return di, dr, nil
}
// withdrawalCredentialsHash forms a 32 byte hash of the withdrawal public
// address.
//
// The specification is as follows:
// withdrawal_credentials[:1] == BLS_WITHDRAWAL_PREFIX_BYTE
// withdrawal_credentials[1:] == hash(withdrawal_pubkey)[1:]
// where withdrawal_credentials is of type bytes32.
func withdrawalCredentialsHash(withdrawalKey *Key) []byte {
h := hashutil.Hash(withdrawalKey.PublicKey.Marshal())
return append([]byte{params.BeaconConfig().BLSWithdrawalPrefixByte}, h[1:]...)[:32]
}