53 lines
1.6 KiB
TypeScript
53 lines
1.6 KiB
TypeScript
// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import memoizee from 'memoizee';
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import { strictAssert } from '../../util/assert';
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import type { AciString } from '../../types/ServiceId';
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import { toAciObject } from '../../util/ServiceId';
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import {
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deriveBackupKey,
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deriveBackupSignatureKey,
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deriveBackupId,
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deriveBackupKeyMaterial,
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} from '../../Crypto';
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import type { BackupKeyMaterialType } from '../../Crypto';
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const getMemoizedBackupKey = memoizee((masterKey: string) => {
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return deriveBackupKey(Buffer.from(masterKey, 'base64'));
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});
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export function getBackupKey(): Uint8Array {
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const masterKey = window.storage.get('masterKey');
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strictAssert(masterKey, 'Master key not available');
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return getMemoizedBackupKey(masterKey);
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}
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const getMemoizedBackupSignatureKey = memoizee(
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(backupKey: Uint8Array, aci: AciString) => {
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const aciBytes = toAciObject(aci).getServiceIdBinary();
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return deriveBackupSignatureKey(backupKey, aciBytes);
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}
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);
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export function getBackupSignatureKey(): Uint8Array {
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const backupKey = getBackupKey();
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const aci = window.storage.user.getCheckedAci();
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return getMemoizedBackupSignatureKey(backupKey, aci);
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}
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const getMemoizedKeyMaterial = memoizee(
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(backupKey: Uint8Array, aci: AciString) => {
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const aciBytes = toAciObject(aci).getServiceIdBinary();
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const backupId = deriveBackupId(backupKey, aciBytes);
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return deriveBackupKeyMaterial(backupKey, backupId);
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}
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);
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export function getKeyMaterial(): BackupKeyMaterialType {
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const backupKey = getBackupKey();
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const aci = window.storage.user.getCheckedAci();
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return getMemoizedKeyMaterial(backupKey, aci);
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}
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