@btc-vision/transaction/build/signer/TweakedSigner.js

OPNet transaction library allows you to create and sign transactions for the OPNet network.

import * as ecc from '@bitcoinerlab/secp256k1';
import { initEccLib, tapTweakHash, toXOnly } from '@btc-vision/bitcoin';
import { EcKeyPair } from '../keypair/EcKeyPair.js';
initEccLib(ecc);
export class TweakedSigner {
    static tweakSigner(signer, opts = {}) {
        let privateKey = signer.privateKey;
        if (!privateKey) {
            throw new Error('Private key is required for tweaking signer!');
        }
        if (signer.publicKey[0] === 3) {
            privateKey = ecc.privateNegate(privateKey);
        }
        const tweakedPrivateKey = ecc.privateAdd(privateKey, tapTweakHash(toXOnly(Buffer.from(signer.publicKey)), opts.tweakHash));
        if (!tweakedPrivateKey) {
            throw new Error('Invalid tweaked private key!');
        }
        return EcKeyPair.fromPrivateKey(Buffer.from(tweakedPrivateKey), opts.network);
    }
}