File size: 1,189 Bytes
10852fa |
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 |
import { checkEncCryptoKey } from './crypto_key.js';
function checkKeySize(key, alg) {
if (key.algorithm.length !== parseInt(alg.slice(1, 4), 10)) {
throw new TypeError(`Invalid key size for alg: ${alg}`);
}
}
function getCryptoKey(key, alg, usage) {
if (key instanceof Uint8Array) {
return crypto.subtle.importKey('raw', key, 'AES-KW', true, [usage]);
}
checkEncCryptoKey(key, alg, usage);
return key;
}
export async function wrap(alg, key, cek) {
const cryptoKey = await getCryptoKey(key, alg, 'wrapKey');
checkKeySize(cryptoKey, alg);
const cryptoKeyCek = await crypto.subtle.importKey('raw', cek, { hash: 'SHA-256', name: 'HMAC' }, true, ['sign']);
return new Uint8Array(await crypto.subtle.wrapKey('raw', cryptoKeyCek, cryptoKey, 'AES-KW'));
}
export async function unwrap(alg, key, encryptedKey) {
const cryptoKey = await getCryptoKey(key, alg, 'unwrapKey');
checkKeySize(cryptoKey, alg);
const cryptoKeyCek = await crypto.subtle.unwrapKey('raw', encryptedKey, cryptoKey, 'AES-KW', { hash: 'SHA-256', name: 'HMAC' }, true, ['sign']);
return new Uint8Array(await crypto.subtle.exportKey('raw', cryptoKeyCek));
}
|