@ckb-ccc/core/dist/signer/nostr/signerNostrPrivateKey.js

Core of CCC - CKBer's Codebase

import { schnorr } from "@noble/curves/secp256k1";
import { bech32 } from "bech32";
import { hexFrom } from "../../hex/index.js";
import { SignerNostrPublicKeyReadonly } from "./signerNostrPublicKeyReadonly.js";
import { nostrEventHash } from "./verify.js";
/**
 * Signer from Nostr private key
 * Support nsec and hex format
 */
export class SignerNostrPrivateKey extends SignerNostrPublicKeyReadonly {
    constructor(client, privateKeyLike) {
        const privateKey = (() => {
            if (typeof privateKeyLike === "string" &&
                privateKeyLike.startsWith("nsec")) {
                const { words } = bech32.decode(privateKeyLike);
                return hexFrom(bech32.fromWords(words));
            }
            return hexFrom(privateKeyLike);
        })();
        super(client, schnorr.getPublicKey(privateKey.slice(2)));
        this.privateKey = privateKey;
    }
    async signNostrEvent(event) {
        const pubkey = (await this.getNostrPublicKey()).slice(2);
        const eventHash = nostrEventHash({ ...event, pubkey });
        const signature = schnorr.sign(eventHash, this.privateKey.slice(2));
        return {
            ...event,
            id: hexFrom(eventHash).slice(2),
            pubkey,
            sig: hexFrom(signature).slice(2),
        };
    }
}