@lodestar/beacon-node/lib/node/utils/interop/deposits.js

A Typescript implementation of the beacon chain

import { digest } from "@chainsafe/as-sha256";
import { Tree, toGindex } from "@chainsafe/persistent-merkle-tree";
import { BLS_WITHDRAWAL_PREFIX, DOMAIN_DEPOSIT, ETH1_ADDRESS_WITHDRAWAL_PREFIX, MAX_EFFECTIVE_BALANCE, } from "@lodestar/params";
import { ZERO_HASH, computeDomain, computeSigningRoot, interopSecretKeys } from "@lodestar/state-transition";
import { ssz } from "@lodestar/types";
/**
 * Compute and return deposit data from other validators.
 */
export function interopDeposits(config, depositDataRootList, validatorCount, { withEth1Credentials } = {}) {
    depositDataRootList.commit();
    const depositTreeDepth = depositDataRootList.type.depth;
    // set credentials if we want withdrawal on or off
    const withdrawalCredentialsPrefix = withEth1Credentials ? ETH1_ADDRESS_WITHDRAWAL_PREFIX : BLS_WITHDRAWAL_PREFIX;
    return interopSecretKeys(validatorCount).map((secretKey, i) => {
        const pubkey = secretKey.toPublicKey().toBytes();
        // create DepositData
        const withdrawalCredentials = digest(pubkey);
        withdrawalCredentials[0] = withdrawalCredentialsPrefix;
        const data = {
            pubkey,
            withdrawalCredentials,
            amount: MAX_EFFECTIVE_BALANCE,
            signature: Buffer.alloc(0),
        };
        const domain = computeDomain(DOMAIN_DEPOSIT, config.GENESIS_FORK_VERSION, ZERO_HASH);
        const signingRoot = computeSigningRoot(ssz.phase0.DepositMessage, data, domain);
        data.signature = secretKey.sign(signingRoot).toBytes();
        // Add to merkle tree
        depositDataRootList.push(ssz.phase0.DepositData.hashTreeRoot(data));
        depositDataRootList.commit();
        return {
            proof: new Tree(depositDataRootList.node).getSingleProof(toGindex(depositTreeDepth, BigInt(i))),
            data,
        };
    });
}
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