polkadot-js/common

// Copyright 2017-2024 @polkadot/util-crypto authors & contributors
// SPDX-License-Identifier: Apache-2.0

import { u8aToU8a } from '@polkadot/util';
import { vrfVerify } from '@polkadot/wasm-crypto';

const EMPTY_U8A = new Uint8Array();

/**
 * @name sr25519VrfVerify
 * @description Verify with sr25519 vrf verification
 */
export function sr25519VrfVerify (message: string | Uint8Array, signOutput: string | Uint8Array, publicKey: string | Uint8Array, context: string | Uint8Array = EMPTY_U8A, extra: string | Uint8Array = EMPTY_U8A): boolean {
  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 vrfVerify(publicKeyU8a, u8aToU8a(context), u8aToU8a(message), u8aToU8a(extra), proofU8a);
}