@okxweb3/coin-bitcoin/dist/taproot.js

@okxweb3/coin-bitcoin is a Bitcoin SDK for building Web3 wallets and applications. It supports BTC, BSV, DOGE, LTC, and TBTC, enabling private key management, transaction signing, address generation, and inscriptions like BRC-20, Runes, CAT, and Atomicals

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.taprootSignSighash = exports.taprootTweakPubkey = exports.taprootTweakPrivKey = void 0;
const crypto_lib_1 = require("@okxweb3/crypto-lib");
const txBuild_1 = require("./txBuild");
const secp256k1 = crypto_lib_1.signUtil.schnorr.secp256k1;
const schnorr = secp256k1.schnorr;
const ProjPoint = secp256k1.secp256k1.ProjectivePoint;
const CURVE_ORDER = secp256k1.secp256k1.CURVE.n;
function tapTweak(a, b) {
    const u = schnorr.utils;
    const t = u.taggedHash('TapTweak', a, b);
    const tn = u.bytesToNumberBE(t);
    if (tn >= CURVE_ORDER)
        throw new Error('tweak higher than curve order');
    return tn;
}
function taprootTweakPrivKey(privKey, merkleRoot = new Uint8Array()) {
    const u = schnorr.utils;
    const seckey0 = u.bytesToNumberBE(privKey);
    const P = ProjPoint.fromPrivateKey(seckey0);
    const seckey = P.hasEvenY() ? seckey0 : u.mod(-seckey0, CURVE_ORDER);
    const xP = u.pointToBytes(P);
    const t = tapTweak(xP, merkleRoot);
    return u.numberToBytesBE(u.mod(seckey + t, CURVE_ORDER), 32);
}
exports.taprootTweakPrivKey = taprootTweakPrivKey;
function taprootTweakPubkey(pubKey, h) {
    if (!h)
        h = new Uint8Array();
    const u = schnorr.utils;
    const t = tapTweak(pubKey, h);
    const P = u.lift_x(u.bytesToNumberBE(pubKey));
    const Q = P.add(ProjPoint.fromPrivateKey(t));
    const parity = Q.hasEvenY() ? 0 : 1;
    return [u.pointToBytes(Q), parity];
}
exports.taprootTweakPubkey = taprootTweakPubkey;
function taprootSignSighash(privKey, sighashes, aux) {
    const tweakedPrivKey = taprootTweakPrivKey(crypto_lib_1.base.fromHex((0, txBuild_1.privateKeyFromWIF)(privKey)));
    const signatures = sighashes.map(sighash => {
        const signature = Buffer.from(schnorr.sign(sighash, tweakedPrivKey, aux));
        return crypto_lib_1.base.toHex(signature);
    });
    return signatures;
}
exports.taprootSignSighash = taprootSignSighash;
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