@vbyte/btc-dev/dist/lib/sighash/util.js

Batteries-included toolset for plebian bitcoin development

import { Buff } from '@vbyte/buff';
import { Assert } from '@vbyte/micro-lib';
import { sha256 } from '@vbyte/micro-lib/hash';
export function get_prevout(vin) {
    Assert.exists(vin.prevout, 'Prevout data missing for input: ' + String(vin.txid));
    return vin.prevout;
}
export function parse_txinput(txdata, config) {
    let { txindex, txinput } = config ?? {};
    if (txindex !== undefined) {
        if (txindex >= txdata.vin.length) {
            throw new Error('Input index out of bounds: ' + String(txindex));
        }
        txinput = txdata.vin.at(txindex);
    }
    Assert.ok(txinput !== undefined);
    return txinput;
}
export function get_annex_data(witness) {
    if (witness === undefined)
        return;
    if (witness.length < 2)
        return;
    const annex = witness.at(-1);
    if (typeof annex === 'string' && annex.startsWith('50')) {
        const bytes = Buff.hex(annex).prefix_varint('be');
        return sha256(bytes);
    }
    return undefined;
}