Add a helper for de-dupe of *AsHex (#1224)

* Add a helper for de-dupe of *AsHex

* Update packages/util-crypto/src/random/asU8a.ts

* lint

* isWasmOnly helper

* bit hasher

packages/util-crypto/src/scrypt/encode.ts

@@ -7,8 +7,9 @@ import type { Params } from './types';
 import scryptsy from 'scryptsy';
 
 import { bufferToU8a, u8aToBuffer, u8aToU8a } from '@polkadot/util';
-import { isReady, scrypt } from '@polkadot/wasm-crypto';
+import { scrypt } from '@polkadot/wasm-crypto';
 
+import { isWasmOnly } from '../helpers';
 import { randomAsU8a } from '../random/asU8a';
 import { DEFAULT_PARAMS } from './defaults';
 
@@ -21,7 +22,7 @@ interface Result {
 export function scryptEncode (passphrase?: HexString | Uint8Array | string, salt = randomAsU8a(), params = DEFAULT_PARAMS, onlyJs?: boolean): Result {
   const u8a = u8aToU8a(passphrase);
 
-  const password = isReady() && !onlyJs
+  const password = isWasmOnly(onlyJs)
     ? scrypt(u8a, salt, Math.log2(params.N), params.r, params.p)
     : bufferToU8a(
       scryptsy(u8aToBuffer(u8a), u8aToBuffer(salt), params.N, params.r, params.p, 64)