@ledgerhq/hw-app-btc/lib-es/newops/policy.js

Ledger Hardware Wallet Bitcoin Application API

import { crypto } from "bitcoinjs-lib";
import { pathArrayToString } from "../bip32";
import { BufferWriter } from "../buffertools";
import { hashLeaf, Merkle } from "./merkle";
/**
 * The Bitcon hardware app uses a descriptors-like thing to describe
 * how to construct output scripts from keys. A "Wallet Policy" consists
 * of a "Descriptor Template" and a list of "keys". A key is basically
 * a serialized BIP32 extended public key with some added derivation path
 * information. This is documented at
 * https://github.com/LedgerHQ/app-bitcoin-new/blob/master/doc/wallet.md
 */
export class WalletPolicy {
    descriptorTemplate;
    keys;
    /**
     * For now, we only support default descriptor templates.
     */
    constructor(descriptorTemplate, key) {
        this.descriptorTemplate = descriptorTemplate;
        this.keys = [key];
    }
    getWalletId() {
        // wallet_id (sha256 of the wallet serialization),
        return crypto.sha256(this.serialize());
    }
    serialize() {
        const keyBuffers = this.keys.map(k => {
            return Buffer.from(k, "ascii");
        });
        const m = new Merkle(keyBuffers.map(k => hashLeaf(k)));
        const buf = new BufferWriter();
        buf.writeUInt8(0x01); // wallet type (policy map)
        buf.writeUInt8(0); // length of wallet name (empty string for default wallets)
        buf.writeVarSlice(Buffer.from(this.descriptorTemplate, "ascii"));
        buf.writeVarInt(this.keys.length), buf.writeSlice(m.getRoot());
        return buf.buffer();
    }
}
export function createKey(masterFingerprint, path, xpub) {
    const accountPath = pathArrayToString(path);
    return `[${masterFingerprint.toString("hex")}${accountPath.substring(1)}]${xpub}/**`;
}
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