@ledgerhq/hw-app-btc/lib-es/getTrustedInputBIP143.js

Ledger Hardware Wallet Bitcoin Application API

import shajs from "sha.js";
import { serializeTransaction } from "./serializeTransaction";
export function getTrustedInputBIP143(transport, indexLookup, transaction, additionals = []) {
    if (!transaction) {
        throw new Error("getTrustedInputBIP143: missing tx");
    }
    const isDecred = additionals.includes("decred");
    if (isDecred) {
        throw new Error("Decred does not implement BIP143");
    }
    let hash = shajs("sha256")
        .update(shajs("sha256").update(serializeTransaction(transaction, true)).digest())
        .digest();
    const data = Buffer.alloc(4);
    data.writeUInt32LE(indexLookup, 0);
    const { outputs, locktime } = transaction;
    if (!outputs || !locktime) {
        throw new Error("getTrustedInputBIP143: locktime & outputs is expected");
    }
    if (!outputs[indexLookup]) {
        throw new Error("getTrustedInputBIP143: wrong index");
    }
    hash = Buffer.concat([hash, data, outputs[indexLookup].amount]);
    return hash.toString("hex");
}
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