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var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
function adopt(value) { return value instanceof P ? value : new P(function (resolve) { resolve(value); }); }
return new (P || (P = Promise))(function (resolve, reject) {
function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
function step(result) { result.done ? resolve(result.value) : adopt(result.value).then(fulfilled, rejected); }
step((generator = generator.apply(thisArg, _arguments || [])).next());
});
};
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
import { hexToUint8, uint8ToBase64Url, uint8ToHex, xor } from './utils';
const encoder = () => new TextEncoder();
const NAMESPACE = 'identity.mozilla.com/picl/v1/';
// These functions implement the onepw protocol
// https://github.com/mozilla/fxa-auth-server/wiki/onepw-protocol
export function getCredentials(email, password) {
return __awaiter(this, void 0, void 0, function* () {
const passkey = yield crypto.subtle.importKey('raw', encoder().encode(password), 'PBKDF2', false, ['deriveBits']);
const quickStretchedRaw = yield crypto.subtle.deriveBits({
name: 'PBKDF2',
salt: encoder().encode(`${NAMESPACE}quickStretch:${email}`),
iterations: 1000,
hash: 'SHA-256',
}, passkey, 256);
const quickStretchedKey = yield crypto.subtle.importKey('raw', quickStretchedRaw, 'HKDF', false, ['deriveBits']);
const authPW = yield crypto.subtle.deriveBits({
name: 'HKDF',
salt: new Uint8Array(0),
// The builtin ts type definition for HKDF was wrong
// at the time this was written, hence the ignore
// @ts-ignore
info: encoder().encode(`${NAMESPACE}authPW`),
hash: 'SHA-256',
}, quickStretchedKey, 256);
const unwrapBKey = yield crypto.subtle.deriveBits({
name: 'HKDF',
salt: new Uint8Array(0),
// @ts-ignore
info: encoder().encode(`${NAMESPACE}unwrapBkey`),
hash: 'SHA-256',
}, quickStretchedKey, 256);
return {
authPW: uint8ToHex(new Uint8Array(authPW)),
unwrapBKey: uint8ToHex(new Uint8Array(unwrapBKey)),
};
});
}
export function deriveBundleKeys(key, keyInfo, payloadBytes = 64) {
return __awaiter(this, void 0, void 0, function* () {
const baseKey = yield crypto.subtle.importKey('raw', hexToUint8(key), 'HKDF', false, ['deriveBits']);
const keyMaterial = yield crypto.subtle.deriveBits({
name: 'HKDF',
salt: new Uint8Array(0),
// @ts-ignore
info: encoder().encode(`${NAMESPACE}${keyInfo}`),
hash: 'SHA-256',
}, baseKey, (32 + payloadBytes) * 8);
const hmacKey = yield crypto.subtle.importKey('raw', new Uint8Array(keyMaterial.slice(0, 32)), {
name: 'HMAC',
hash: 'SHA-256',
length: 256,
}, true, ['verify']);
const xorKey = new Uint8Array(keyMaterial.slice(32));
return {
hmacKey,
xorKey,
};
});
}
export function unbundleKeyFetchResponse(key, bundle) {
return __awaiter(this, void 0, void 0, function* () {
const b = hexToUint8(bundle);
const keys = yield deriveBundleKeys(key, 'account/keys');
const ciphertext = b.subarray(0, 64);
const expectedHmac = b.subarray(b.byteLength - 32);
const valid = yield crypto.subtle.verify('HMAC', keys.hmacKey, expectedHmac, ciphertext);
if (!valid) {
throw new Error('Bad HMac');
}
const keyAWrapB = xor(ciphertext, keys.xorKey);
return {
kA: uint8ToHex(keyAWrapB.subarray(0, 32)),
wrapKB: uint8ToHex(keyAWrapB.subarray(32)),
};
});
}
export function unwrapKB(wrapKB, unwrapBKey) {
return uint8ToHex(xor(hexToUint8(wrapKB), hexToUint8(unwrapBKey)));
}
export function hkdf(keyMaterial, salt, info, bytes) {
return __awaiter(this, void 0, void 0, function* () {
const key = yield crypto.subtle.importKey('raw', keyMaterial, 'HKDF', false, [
'deriveBits',
]);
const result = yield crypto.subtle.deriveBits({
name: 'HKDF',
salt,
// @ts-ignore
info,
hash: 'SHA-256',
}, key, bytes * 8);
return new Uint8Array(result);
});
}
export function jweEncrypt(keyMaterial, kid, data, forTestingOnly) {
return __awaiter(this, void 0, void 0, function* () {
const key = yield crypto.subtle.importKey('raw', keyMaterial, {
name: 'AES-GCM',
}, false, ['encrypt']);
const jweHeader = uint8ToBase64Url(encoder().encode(JSON.stringify({
enc: 'A256GCM',
alg: 'dir',
kid,
})));
const iv = (forTestingOnly === null || forTestingOnly === void 0 ? void 0 : forTestingOnly.testIV) || crypto.getRandomValues(new Uint8Array(12));
const encrypted = yield crypto.subtle.encrypt({
name: 'AES-GCM',
iv,
additionalData: encoder().encode(jweHeader),
tagLength: 128,
}, key, data);
const ciphertext = new Uint8Array(encrypted.slice(0, encrypted.byteLength - 16));
const authenticationTag = new Uint8Array(encrypted.slice(encrypted.byteLength - 16));
// prettier-ignore
const compactJWE = `${jweHeader}..${uint8ToBase64Url(iv)}.${uint8ToBase64Url(ciphertext)}.${uint8ToBase64Url(authenticationTag)}`;
return compactJWE;
});
}
export function checkWebCrypto() {
return __awaiter(this, void 0, void 0, function* () {
try {
yield crypto.subtle.importKey('raw', crypto.getRandomValues(new Uint8Array(16)), 'PBKDF2', false, ['deriveKey']);
yield crypto.subtle.importKey('raw', crypto.getRandomValues(new Uint8Array(32)), 'HKDF', false, ['deriveKey']);
yield crypto.subtle.importKey('raw', crypto.getRandomValues(new Uint8Array(32)), {
name: 'HMAC',
hash: 'SHA-256',
length: 256,
}, false, ['sign']);
yield crypto.subtle.importKey('raw', crypto.getRandomValues(new Uint8Array(32)), {
name: 'AES-GCM',
}, false, ['encrypt']);
yield crypto.subtle.digest('SHA-256', crypto.getRandomValues(new Uint8Array(16)));
return true;
}
catch (err) {
try {
console.warn('loading webcrypto shim', err);
// prettier-ignore
// @ts-ignore
window.asmCrypto = yield import(/* webpackChunkName: "asmcrypto.js" */ 'asmcrypto.js');
// prettier-ignore
// @ts-ignore
yield import(/* webpackChunkName: "webcrypto-liner" */ 'webcrypto-liner/build/shim');
return true;
}
catch (e) {
return false;
}
}
});
}
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