mirror of
https://gitlab.com/pulsechaincom/prysm-pulse.git
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69 lines
2.9 KiB
Go
69 lines
2.9 KiB
Go
// Package keystore contains useful functions for dealing
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// with eth2 deposit inputs leveraging go-ethereum's own keystore package.
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package keystore
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import (
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ethpb "github.com/prysmaticlabs/ethereumapis/eth/v1alpha1"
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"github.com/prysmaticlabs/go-ssz"
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"github.com/prysmaticlabs/prysm/beacon-chain/core/helpers"
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pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
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"github.com/prysmaticlabs/prysm/shared/hashutil"
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"github.com/prysmaticlabs/prysm/shared/params"
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)
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// DepositInput for a given key. This input data can be used to when making a
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// validator deposit. The input data includes a proof of possession field
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// signed by the deposit key.
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//
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// Spec details about general deposit workflow:
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// To submit a deposit:
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//
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// - Pack the validator's initialization parameters into deposit_data, a Deposit_Data SSZ object.
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// - Let amount be the amount in Gwei to be deposited by the validator where MIN_DEPOSIT_AMOUNT <= amount <= MAX_EFFECTIVE_BALANCE.
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// - Set deposit_data.amount = amount.
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// - 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).
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// - 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.
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//
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// See: https://github.com/ethereum/eth2.0-specs/blob/master/specs/validator/0_beacon-chain-validator.md#submit-deposit
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func DepositInput(depositKey *Key, withdrawalKey *Key, amountInGwei uint64) (*ethpb.Deposit_Data, [32]byte, error) {
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di := ðpb.Deposit_Data{
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PublicKey: depositKey.PublicKey.Marshal(),
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WithdrawalCredentials: withdrawalCredentialsHash(withdrawalKey),
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Amount: amountInGwei,
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}
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sr, err := ssz.SigningRoot(di)
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if err != nil {
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return nil, [32]byte{}, err
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}
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domain, err := helpers.ComputeDomain(params.BeaconConfig().DomainDeposit, nil /*forkVersion*/, nil /*genesisValidatorsRoot*/)
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if err != nil {
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return nil, [32]byte{}, err
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}
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root, err := ssz.HashTreeRoot(&pb.SigningData{ObjectRoot: sr[:], Domain: domain})
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if err != nil {
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return nil, [32]byte{}, err
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}
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di.Signature = depositKey.SecretKey.Sign(root[:]).Marshal()
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dr, err := ssz.HashTreeRoot(di)
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if err != nil {
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return nil, [32]byte{}, err
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}
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return di, dr, nil
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}
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// withdrawalCredentialsHash forms a 32 byte hash of the withdrawal public
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// address.
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//
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// The specification is as follows:
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// withdrawal_credentials[:1] == BLS_WITHDRAWAL_PREFIX_BYTE
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// withdrawal_credentials[1:] == hash(withdrawal_pubkey)[1:]
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// where withdrawal_credentials is of type bytes32.
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func withdrawalCredentialsHash(withdrawalKey *Key) []byte {
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h := hashutil.Hash(withdrawalKey.PublicKey.Marshal())
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return append([]byte{params.BeaconConfig().BLSWithdrawalPrefixByte}, h[1:]...)[:32]
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}
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