@lighthouse-web3/kavach/dist/methods/recoverKey/index.js

Encryption SDK: Build your trustless, decentralized and fault resistance Application using distributed key shades with threshold cryptography

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.recoverKey = void 0;
let bls = null;
if (typeof window === "undefined") {
    bls = eval("require")("bls-eth-wasm");
}
else {
    bls = require("bls-eth-wasm/browser");
}
const recoverKey = async (keyShards) => {
    if (!Array.isArray(keyShards) ||
        !(typeof keyShards[0].index == "string") ||
        !(typeof keyShards[0].key == "string")) {
        throw new Error("keyShards must be an array of objects containing these keys [index, key]");
    }
    try {
        const idVec = [];
        const secVec = [];
        await bls.init(bls.BLS12_381).then(() => bls.getCurveOrder());
        keyShards.map((keyShard) => {
            const sk = new bls.SecretKey();
            //convert readable string into secretKey vectors
            sk.deserializeHexStr(keyShard.key);
            secVec.push(sk);
            //convert readable string into Id vectors
            const id = new bls.Id();
            id.deserializeHexStr(keyShard.index);
            idVec.push(id);
        });
        const sec = new bls.SecretKey();
        //recover key
        sec.recover(secVec, idVec);
        const s = sec.serializeToHexStr();
        return { masterKey: s, error: null };
    }
    catch (err) {
        return { masterKey: null, error: "can't recover Key" };
    }
};
exports.recoverKey = recoverKey;