@polkadot/util-crypto/sr25519/vrfVerify.js

A collection of useful crypto utilities for @polkadot

import * as sr25519 from '@scure/sr25519';
import { u8aToU8a } from '@polkadot/util';
const EMPTY_U8A = new Uint8Array();
/**
 * @name sr25519VrfVerify
 * @description Verify with sr25519 vrf verification
 */
export function sr25519VrfVerify(message, signOutput, publicKey, context = EMPTY_U8A, extra = EMPTY_U8A) {
    const publicKeyU8a = u8aToU8a(publicKey);
    const proofU8a = u8aToU8a(signOutput);
    if (publicKeyU8a.length !== 32) {
        throw new Error('Invalid publicKey, expected 32-bytes');
    }
    else if (proofU8a.length !== 96) {
        throw new Error('Invalid vrfSign output, expected 96 bytes');
    }
    return sr25519.vrf.verify(u8aToU8a(message), proofU8a, publicKeyU8a, u8aToU8a(context), u8aToU8a(extra));
}