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

Ledger Hardware Wallet Bitcoin Application API

import { createVarint } from "./varint";
import { MAX_SCRIPT_BLOCK } from "./constants";
export function startUntrustedHashTransactionInputRaw(transport, newTransaction, firstRound, transactionData, bip143 = false, overwinter = false, additionals = []) {
    const p2 = additionals.includes("cashaddr")
        ? 0x03
        : bip143
            ? additionals.includes("sapling")
                ? 0x05
                : overwinter
                    ? 0x04
                    : 0x02
            : 0x00;
    return transport.send(0xe0, 0x44, firstRound ? 0x00 : 0x80, newTransaction ? p2 : 0x80, transactionData);
}
export async function startUntrustedHashTransactionInput(transport, newTransaction, transaction, inputs, bip143 = false, overwinter = false, additionals = [], useTrustedInputForSegwit = false) {
    let data = Buffer.concat([
        transaction.version,
        transaction.timestamp || Buffer.alloc(0),
        transaction.nVersionGroupId || Buffer.alloc(0),
        createVarint(transaction.inputs.length),
    ]);
    await startUntrustedHashTransactionInputRaw(transport, newTransaction, true, data, bip143, overwinter, additionals);
    let i = 0;
    const isDecred = additionals.includes("decred");
    for (const input of transaction.inputs) {
        let prefix;
        const inputValue = inputs[i].value;
        if (bip143) {
            if (useTrustedInputForSegwit && inputs[i].trustedInput) {
                prefix = Buffer.from([0x01, inputValue.length]);
            }
            else {
                prefix = Buffer.from([0x02]);
            }
        }
        else {
            if (inputs[i].trustedInput) {
                prefix = Buffer.from([0x01, inputs[i].value.length]);
            }
            else {
                prefix = Buffer.from([0x00]);
            }
        }
        data = Buffer.concat([
            prefix,
            inputValue,
            isDecred ? Buffer.from([0x00]) : Buffer.alloc(0),
            createVarint(input.script.length),
        ]);
        await startUntrustedHashTransactionInputRaw(transport, newTransaction, false, data, bip143, overwinter, additionals);
        const scriptBlocks = [];
        let offset = 0;
        if (input.script.length === 0) {
            scriptBlocks.push(input.sequence);
        }
        else {
            while (offset !== input.script.length) {
                const blockSize = input.script.length - offset > MAX_SCRIPT_BLOCK
                    ? MAX_SCRIPT_BLOCK
                    : input.script.length - offset;
                if (offset + blockSize !== input.script.length) {
                    scriptBlocks.push(input.script.slice(offset, offset + blockSize));
                }
                else {
                    scriptBlocks.push(Buffer.concat([input.script.slice(offset, offset + blockSize), input.sequence]));
                }
                offset += blockSize;
            }
        }
        for (const scriptBlock of scriptBlocks) {
            await startUntrustedHashTransactionInputRaw(transport, newTransaction, false, scriptBlock, bip143, overwinter, additionals);
        }
        i++;
    }
}
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