65 lines
2.1 KiB
JavaScript
65 lines
2.1 KiB
JavaScript
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import { KeyObject, publicEncrypt, constants, privateDecrypt } from 'crypto';
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import checkModulusLength from './check_modulus_length.js';
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import { isCryptoKey } from './webcrypto.js';
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import { checkEncCryptoKey } from '../lib/crypto_key.js';
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import isKeyObject from './is_key_object.js';
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import invalidKeyInput from '../lib/invalid_key_input.js';
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import { types } from './is_key_like.js';
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const checkKey = (key, alg) => {
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if (key.asymmetricKeyType !== 'rsa') {
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throw new TypeError('Invalid key for this operation, its asymmetricKeyType must be rsa');
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}
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checkModulusLength(key, alg);
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};
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const resolvePadding = (alg) => {
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switch (alg) {
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case 'RSA-OAEP':
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case 'RSA-OAEP-256':
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case 'RSA-OAEP-384':
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case 'RSA-OAEP-512':
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return constants.RSA_PKCS1_OAEP_PADDING;
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case 'RSA1_5':
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return constants.RSA_PKCS1_PADDING;
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default:
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return undefined;
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}
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};
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const resolveOaepHash = (alg) => {
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switch (alg) {
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case 'RSA-OAEP':
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return 'sha1';
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case 'RSA-OAEP-256':
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return 'sha256';
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case 'RSA-OAEP-384':
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return 'sha384';
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case 'RSA-OAEP-512':
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return 'sha512';
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default:
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return undefined;
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}
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};
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function ensureKeyObject(key, alg, ...usages) {
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if (isKeyObject(key)) {
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return key;
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}
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if (isCryptoKey(key)) {
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checkEncCryptoKey(key, alg, ...usages);
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return KeyObject.from(key);
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}
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throw new TypeError(invalidKeyInput(key, ...types));
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}
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export const encrypt = (alg, key, cek) => {
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const padding = resolvePadding(alg);
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const oaepHash = resolveOaepHash(alg);
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const keyObject = ensureKeyObject(key, alg, 'wrapKey', 'encrypt');
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checkKey(keyObject, alg);
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return publicEncrypt({ key: keyObject, oaepHash, padding }, cek);
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};
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export const decrypt = (alg, key, encryptedKey) => {
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const padding = resolvePadding(alg);
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const oaepHash = resolveOaepHash(alg);
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const keyObject = ensureKeyObject(key, alg, 'unwrapKey', 'decrypt');
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checkKey(keyObject, alg);
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return privateDecrypt({ key: keyObject, oaepHash, padding }, encryptedKey);
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};
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