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import type { HexString } from 'https://deno.land/x/polkadot@0.2.33/util/types.ts';import type { HashType } from './types.ts';
import { u8aEq, u8aToU8a } from 'https://deno.land/x/polkadot@0.2.33/util/mod.ts';
import { hasher } from './hasher.ts';import { secp256k1Recover } from './recover.ts';
/** * @name secp256k1Verify * @description Verifies the signature of `message`, using the supplied pair */export function secp256k1Verify (msgHash: HexString | Uint8Array | string, signature: HexString | Uint8Array | string, address: HexString | Uint8Array | string, hashType: HashType = 'blake2', onlyJs?: boolean): boolean {  const sig = u8aToU8a(signature);
  if (sig.length !== 65) {    throw new Error(`Expected signature with 65 bytes, ${sig.length} found instead`);  }
  const publicKey = secp256k1Recover(hasher(hashType, msgHash), sig, sig[64], hashType, onlyJs);  const signerAddr = hasher(hashType, publicKey, onlyJs);  const inputAddr = u8aToU8a(address);
  // for Ethereum (keccak) the last 20 bytes is the address  return u8aEq(publicKey, inputAddr) || (    hashType === 'keccak'      ? u8aEq(signerAddr.slice(-20), inputAddr.slice(-20))      : u8aEq(signerAddr, inputAddr)  );}