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273993a7e0
* move deposit input to keystore pkg, add proof of possession and withdrawal addr * Add spec details for deposit input * Use ssz * actually use withdrawal key
52 lines
2.2 KiB
Go
52 lines
2.2 KiB
Go
package keystore
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import (
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"bytes"
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pb "github.com/prysmaticlabs/prysm/proto/beacon/p2p/v1"
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"github.com/prysmaticlabs/prysm/shared/params"
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"github.com/prysmaticlabs/prysm/shared/ssz"
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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_input, a DepositInput SSZ object.
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// - Set deposit_input.proof_of_possession = EMPTY_SIGNATURE.
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// - Let proof_of_possession be the result of bls_sign of the hash_tree_root(deposit_input) with domain=DOMAIN_DEPOSIT.
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// - Set deposit_input.proof_of_possession = proof_of_possession.
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// - Let amount be the amount in Gwei to be deposited by the validator where MIN_DEPOSIT_AMOUNT <= amount <= MAX_DEPOSIT_AMOUNT.
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// - Send a transaction on the Ethereum 1.0 chain to DEPOSIT_CONTRACT_ADDRESS executing deposit along with serialize(deposit_input) as the singular bytes input along with a deposit amount in Gwei.
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//
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// See: https://github.com/ethereum/eth2.0-specs/blob/dev/specs/validator/0_beacon-chain-validator.md#submit-deposit
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func DepositInput(depositKey *Key, withdrawalKey *Key) (*pb.DepositInput, error) {
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di := &pb.DepositInput{
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Pubkey: depositKey.PublicKey.Marshal(),
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WithdrawalCredentialsHash32: withdrawalCredentialsHash(withdrawalKey),
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}
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buf := new(bytes.Buffer)
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if err := ssz.Encode(buf, di); err != nil {
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return nil, err
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}
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di.ProofOfPossession = depositKey.SecretKey.Sign(buf.Bytes(), params.BeaconConfig().DomainDeposit).Marshal()
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return di, 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 := Keccak256(withdrawalKey.PublicKey.Marshal())
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return append([]byte{params.BeaconConfig().BLSWithdrawalPrefixByte}, h...)[:32]
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}
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