1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
import crypto, { isCryptoKey } from './webcrypto.ts'import { checkSigCryptoKey } from '../lib/crypto_key.ts'import invalidKeyInput from '../lib/invalid_key_input.ts'import { types } from './is_key_like.ts'
export default function getCryptoKey(alg: string, key: unknown, usage: KeyUsage) {  if (isCryptoKey(key)) {    checkSigCryptoKey(key, alg, usage)    return key  }
  if (key instanceof Uint8Array) {    if (!alg.startsWith('HS')) {      throw new TypeError(invalidKeyInput(key, ...types))    }    return crypto.subtle.importKey(      'raw',      key,      { hash: `SHA-${alg.slice(-3)}`, name: 'HMAC' },      false,      [usage],    )  }
  throw new TypeError(invalidKeyInput(key, ...types, 'Uint8Array'))}