70 lines
2 KiB
TypeScript
70 lines
2 KiB
TypeScript
// Copyright 2020 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { PublicKey, Fingerprint } from '@signalapp/libsignal-client';
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import type { ConversationType } from '../state/ducks/conversations';
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import { assertDev } from './assert';
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import { uuidToBytes } from './uuidToBytes';
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import * as log from '../logging/log';
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import type { SafetyNumberType } from '../types/safetyNumber';
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import { isAciString } from './isAciString';
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const ITERATION_COUNT = 5200;
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const SERVICE_ID_VERSION = 2;
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// Number of digits in a safety number block
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const BLOCK_SIZE = 5;
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export async function generateSafetyNumber(
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contact: ConversationType
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): Promise<SafetyNumberType> {
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const logId = `generateSafetyNumbers(${contact.id})`;
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log.info(`${logId}: starting`);
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const { storage } = window.textsecure;
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const ourAci = storage.user.getCheckedAci();
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const us = storage.protocol.getIdentityRecord(ourAci);
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const ourKeyBuffer = us ? us.publicKey : null;
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const theirAci = isAciString(contact.serviceId)
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? contact.serviceId
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: undefined;
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const them = theirAci
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? await storage.protocol.getOrMigrateIdentityRecord(theirAci)
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: undefined;
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const theirKeyBuffer = them?.publicKey;
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if (!ourKeyBuffer) {
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throw new Error('Could not load our key');
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}
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if (!theirKeyBuffer) {
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throw new Error('Could not load their key');
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}
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const ourKey = PublicKey.deserialize(Buffer.from(ourKeyBuffer));
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const theirKey = PublicKey.deserialize(Buffer.from(theirKeyBuffer));
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assertDev(theirAci, 'Should have their serviceId');
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const fingerprint = Fingerprint.new(
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ITERATION_COUNT,
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SERVICE_ID_VERSION,
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Buffer.from(uuidToBytes(ourAci)),
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ourKey,
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Buffer.from(uuidToBytes(theirAci)),
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theirKey
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);
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const securityNumber = fingerprint.displayableFingerprint().toString();
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const numberBlocks = [];
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for (let i = 0; i < securityNumber.length; i += BLOCK_SIZE) {
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numberBlocks.push(securityNumber.substring(i, i + BLOCK_SIZE));
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}
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const qrData = fingerprint.scannableFingerprint().toBuffer();
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return { numberBlocks, qrData };
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}
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