37 lines
878 B
TypeScript
37 lines
878 B
TypeScript
// Copyright 2024 Signal Messenger, LLC
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// SPDX-License-Identifier: AGPL-3.0-only
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import { createHmac } from 'crypto';
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import { Transform } from 'stream';
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import type { Duplex } from 'stream';
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import { HashType } from '../types/Crypto';
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export const MAC_KEY_SIZE = 32;
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export const MAC_SIZE = 32;
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export function appendMacStream(macKey: Uint8Array): Duplex {
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if (macKey.byteLength !== MAC_KEY_SIZE) {
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throw new Error('appendMacStream: invalid macKey length');
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}
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const hmac = createHmac(HashType.size256, macKey);
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return new Transform({
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transform(chunk, _encoding, callback) {
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try {
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hmac.update(chunk);
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callback(null, chunk);
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} catch (error) {
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callback(error);
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}
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},
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flush(callback) {
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try {
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callback(null, hmac.digest());
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} catch (error) {
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callback(error);
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}
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},
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});
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}
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