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check_key_type.ts
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check_key_type.ts
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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