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Viewing file:     ecdhes.js (3.1 KB)      -rw-r--r--

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.ecdhAllowed = exports.generateEpk = exports.deriveKey = void 0;
const crypto_1 = require("crypto");
const util_1 = require("util");
const get_named_curve_js_1 = require("./get_named_curve.js");
const buffer_utils_js_1 = require("../lib/buffer_utils.js");
const errors_js_1 = require("../util/errors.js");
const webcrypto_js_1 = require("./webcrypto.js");
const crypto_key_js_1 = require("../lib/crypto_key.js");
const is_key_object_js_1 = require("./is_key_object.js");
const invalid_key_input_js_1 = require("../lib/invalid_key_input.js");
const is_key_like_js_1 = require("./is_key_like.js");
const generateKeyPair = (0, util_1.promisify)(crypto_1.generateKeyPair);
async function deriveKey(publicKee, privateKee, algorithm, keyLength, apu = new Uint8Array(0), apv = new Uint8Array(0)) {
    let publicKey;
    if ((0, webcrypto_js_1.isCryptoKey)(publicKee)) {
        (0, crypto_key_js_1.checkEncCryptoKey)(publicKee, 'ECDH');
        publicKey = crypto_1.KeyObject.from(publicKee);
    }
    else if ((0, is_key_object_js_1.default)(publicKee)) {
        publicKey = publicKee;
    }
    else {
        throw new TypeError((0, invalid_key_input_js_1.default)(publicKee, ...is_key_like_js_1.types));
    }
    let privateKey;
    if ((0, webcrypto_js_1.isCryptoKey)(privateKee)) {
        (0, crypto_key_js_1.checkEncCryptoKey)(privateKee, 'ECDH', 'deriveBits');
        privateKey = crypto_1.KeyObject.from(privateKee);
    }
    else if ((0, is_key_object_js_1.default)(privateKee)) {
        privateKey = privateKee;
    }
    else {
        throw new TypeError((0, invalid_key_input_js_1.default)(privateKee, ...is_key_like_js_1.types));
    }
    const value = (0, buffer_utils_js_1.concat)((0, buffer_utils_js_1.lengthAndInput)(buffer_utils_js_1.encoder.encode(algorithm)), (0, buffer_utils_js_1.lengthAndInput)(apu), (0, buffer_utils_js_1.lengthAndInput)(apv), (0, buffer_utils_js_1.uint32be)(keyLength));
    const sharedSecret = (0, crypto_1.diffieHellman)({ privateKey, publicKey });
    return (0, buffer_utils_js_1.concatKdf)(sharedSecret, keyLength, value);
}
exports.deriveKey = deriveKey;
async function generateEpk(kee) {
    let key;
    if ((0, webcrypto_js_1.isCryptoKey)(kee)) {
        key = crypto_1.KeyObject.from(kee);
    }
    else if ((0, is_key_object_js_1.default)(kee)) {
        key = kee;
    }
    else {
        throw new TypeError((0, invalid_key_input_js_1.default)(kee, ...is_key_like_js_1.types));
    }
    switch (key.asymmetricKeyType) {
        case 'x25519':
            return generateKeyPair('x25519');
        case 'x448': {
            return generateKeyPair('x448');
        }
        case 'ec': {
            const namedCurve = (0, get_named_curve_js_1.default)(key);
            return generateKeyPair('ec', { namedCurve });
        }
        default:
            throw new errors_js_1.JOSENotSupported('Invalid or unsupported EPK');
    }
}
exports.generateEpk = generateEpk;
const ecdhAllowed = (key) => ['P-256', 'P-384', 'P-521', 'X25519', 'X448'].includes((0, get_named_curve_js_1.default)(key));
exports.ecdhAllowed = ecdhAllowed;