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
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
import { withAlg as invalidKeyInput } from './invalid_key_input.ts'import isKeyLike, { types } from '../runtime/is_key_like.ts'
const symmetricTypeCheck = (alg: string, key: unknown) => {  if (key instanceof Uint8Array) return
  if (!isKeyLike(key)) {    throw new TypeError(invalidKeyInput(alg, key, ...types, 'Uint8Array'))  }
  if (key.type !== 'secret') {    throw new TypeError(      `${types.join(' or ')} instances for symmetric algorithms must be of type "secret"`,    )  }}
const asymmetricTypeCheck = (alg: string, key: unknown, usage: string) => {  if (!isKeyLike(key)) {    throw new TypeError(invalidKeyInput(alg, key, ...types))  }
  if (key.type === 'secret') {    throw new TypeError(      `${types.join(' or ')} instances for asymmetric algorithms must not be of type "secret"`,    )  }
  if (usage === 'sign' && key.type === 'public') {    throw new TypeError(      `${types.join(' or ')} instances for asymmetric algorithm signing must be of type "private"`,    )  }
  if (usage === 'decrypt' && key.type === 'public') {    throw new TypeError(      `${types.join(        ' or ',      )} instances for asymmetric algorithm decryption must be of type "private"`,    )  }
  // KeyObject allows this but CryptoKey does not.  if ((<CryptoKey>key).algorithm && usage === 'verify' && key.type === 'private') {    throw new TypeError(      `${types.join(' or ')} instances for asymmetric algorithm verifying must be of type "public"`,    )  }
  // KeyObject allows this but CryptoKey does not.  if ((<CryptoKey>key).algorithm && usage === 'encrypt' && key.type === 'private') {    throw new TypeError(      `${types.join(        ' or ',      )} instances for asymmetric algorithm encryption must be of type "public"`,    )  }}
const checkKeyType = (alg: string, key: unknown, usage: string): void => {  const symmetric =    alg.startsWith('HS') ||    alg === 'dir' ||    alg.startsWith('PBES2') ||    /^A\d{3}(?:GCM)?KW$/.test(alg)
  if (symmetric) {    symmetricTypeCheck(alg, key)  } else {    asymmetricTypeCheck(alg, key, usage)  }}
export default checkKeyType