@covenance/dlc/dist/cet/signature.js

Crypto and Bitcoin functions for Covenance DLC implementation

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.signCetWithAdaptorSig = signCetWithAdaptorSig;
exports.verifyCetAdaptorSig = verifyCetAdaptorSig;
exports.verifyCetSignature = verifyCetSignature;
exports.sigToTaprootBuf = sigToTaprootBuf;
const sighash_1 = require("./sighash");
const counterparty_1 = require("../crypto/counterparty");
const general_1 = require("../crypto/general");
const utils_1 = require("../utils");
/**
 * Creates an adaptor signature for a CET
 * @param counterpartyPrivKey - The private key of the counterparty creating the signature
 * @param oracleSigPoint - The oracle's signature point for the event outcome
 * @param cet - The CET transaction to sign
 * @param inputIndex - The index of the input to sign in the CET
 * @param tapleafHash - The hash of the tapleaf
 * @returns The adaptor signature for the CET
 */
async function signCetWithAdaptorSig(counterpartyPrivKey, oracleSigPoint, cet, inputIndex, tapleafHash) {
    // Get the sighash for the CET
    const cetSighash = (0, sighash_1.sighashForAdaptorSig)(cet, inputIndex, tapleafHash);
    // Create the adaptor signature using the sighash as the message
    return (0, counterparty_1.createAdaptorSig)(counterpartyPrivKey, oracleSigPoint, cetSighash);
}
/**
 * Verifies an adaptor signature for a CET
 * @param signature - The adaptor signature to verify
 * @param counterpartyPubKey - The counterparty's public key
 * @param oracleSigPoint - The oracle's signature point for the event outcome
 * @param cet - The CET transaction that was signed
 * @param inputIndex - The index of the input that was signed
 * @param tapleafHash - The hash of the tapleaf
 * @returns True if the signature is valid, false otherwise
 */
async function verifyCetAdaptorSig(signature, counterpartyPubKey, oracleSigPoint, cet, inputIndex, tapleafHash) {
    // Get the sighash for the CET
    const cetSighash = (0, sighash_1.sighashForAdaptorSig)(cet, inputIndex, tapleafHash);
    // Verify the signature using the sighash as the message
    return (0, counterparty_1.verifyAdaptorSig)(signature, counterpartyPubKey, cetSighash, oracleSigPoint);
}
/**
 * Verifies a completed signature for a CET
 * @param signature - The completed signature to verify
 * @param counterpartyPubKey - The counterparty's public key
 * @param cet - The CET transaction that was signed
 * @param inputIndex - The index of the input that was signed
 * @param tapleafHash - The hash of the tapleaf
 * @returns True if the signature is valid, false otherwise
 */
async function verifyCetSignature(signature, counterpartyPubKey, cet, inputIndex, tapleafHash) {
    // Get the sighash for the CET
    const cetSighash = (0, sighash_1.sighashForAdaptorSig)(cet, inputIndex, tapleafHash);
    // Verify the signature using the sighash as the message
    return (0, general_1.verifySig)(signature, counterpartyPubKey, cetSighash);
}
/**
 * Taproot/SegWit-v1 Schnorr signature serializer
 * @param signature - The signature to serialize
 * @param sighash - The sighash to serialize
 * @returns The serialized signature
 */
function sigToTaprootBuf({ R, s }, sighash = 0x00) {
    const addFlag = sighash !== 0x00;
    const out = new Uint8Array(addFlag ? 65 : 64);
    (0, utils_1.be32)(out, 0, R.x);
    (0, utils_1.be32)(out, 32, s);
    if (addFlag)
        out[64] = sighash;
    return out;
}
//# sourceMappingURL=signature.js.map