56 lines
2.5 KiB
JavaScript
56 lines
2.5 KiB
JavaScript
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"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.unwrap = exports.wrap = void 0;
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const buffer_1 = require("buffer");
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const crypto_1 = require("crypto");
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const errors_js_1 = require("../util/errors.js");
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const buffer_utils_js_1 = require("../lib/buffer_utils.js");
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const webcrypto_js_1 = require("./webcrypto.js");
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const crypto_key_js_1 = require("../lib/crypto_key.js");
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const is_key_object_js_1 = require("./is_key_object.js");
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const invalid_key_input_js_1 = require("../lib/invalid_key_input.js");
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const ciphers_js_1 = require("./ciphers.js");
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const is_key_like_js_1 = require("./is_key_like.js");
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function checkKeySize(key, alg) {
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if (key.symmetricKeySize << 3 !== parseInt(alg.slice(1, 4), 10)) {
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throw new TypeError(`Invalid key size for alg: ${alg}`);
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}
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}
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function ensureKeyObject(key, alg, usage) {
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if ((0, is_key_object_js_1.default)(key)) {
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return key;
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}
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if (key instanceof Uint8Array) {
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return (0, crypto_1.createSecretKey)(key);
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}
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if ((0, webcrypto_js_1.isCryptoKey)(key)) {
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(0, crypto_key_js_1.checkEncCryptoKey)(key, alg, usage);
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return crypto_1.KeyObject.from(key);
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}
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throw new TypeError((0, invalid_key_input_js_1.default)(key, ...is_key_like_js_1.types, 'Uint8Array'));
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}
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const wrap = (alg, key, cek) => {
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const size = parseInt(alg.slice(1, 4), 10);
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const algorithm = `aes${size}-wrap`;
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if (!(0, ciphers_js_1.default)(algorithm)) {
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throw new errors_js_1.JOSENotSupported(`alg ${alg} is not supported either by JOSE or your javascript runtime`);
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}
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const keyObject = ensureKeyObject(key, alg, 'wrapKey');
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checkKeySize(keyObject, alg);
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const cipher = (0, crypto_1.createCipheriv)(algorithm, keyObject, buffer_1.Buffer.alloc(8, 0xa6));
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return (0, buffer_utils_js_1.concat)(cipher.update(cek), cipher.final());
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};
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exports.wrap = wrap;
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const unwrap = (alg, key, encryptedKey) => {
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const size = parseInt(alg.slice(1, 4), 10);
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const algorithm = `aes${size}-wrap`;
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if (!(0, ciphers_js_1.default)(algorithm)) {
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throw new errors_js_1.JOSENotSupported(`alg ${alg} is not supported either by JOSE or your javascript runtime`);
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}
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const keyObject = ensureKeyObject(key, alg, 'unwrapKey');
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checkKeySize(keyObject, alg);
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const cipher = (0, crypto_1.createDecipheriv)(algorithm, keyObject, buffer_1.Buffer.alloc(8, 0xa6));
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return (0, buffer_utils_js_1.concat)(cipher.update(encryptedKey), cipher.final());
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};
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exports.unwrap = unwrap;
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