43 lines
1.6 KiB
TypeScript
43 lines
1.6 KiB
TypeScript
/// SPDX-License-Identifier: GPL-3.0-or-later
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/// SPDX-FileCopyrightText: Copyright © 2016-2021 Tony Garnock-Jones <tonyg@leastfixedpoint.com>
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import { Bytes, underlying } from '@preserves/core';
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import * as node_crypto from 'crypto';
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export const KEY_LENGTH = 16; // 128 bits
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export const newKey: () => Promise<Bytes> =
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(typeof crypto !== 'undefined' && 'getRandomValues' in crypto)
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? (async () => {
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const bs = new Bytes(KEY_LENGTH);
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crypto.getRandomValues(underlying(bs));
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return bs;
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})
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: (async () => Bytes.from(node_crypto.randomBytes(KEY_LENGTH)));
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export const mac: (secretKey: Bytes, data: Bytes) => Promise<Bytes> =
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(typeof crypto !== 'undefined' && 'subtle' in crypto)
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? (async (secretKey, data) => {
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if (secretKey.length !== KEY_LENGTH) throw new Error("Invalid key length");
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const k = await window.crypto.subtle.importKey(
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"raw",
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underlying(secretKey),
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{
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hash: 'SHA-256',
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name: 'HMAC',
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},
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false,
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['sign']);
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const bs = await window.crypto.subtle.sign({ name: 'HMAC' }, k, underlying(data));
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return Bytes.from(new Uint8Array(bs, 0, KEY_LENGTH));
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})
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: (typeof node_crypto.createHmac !== 'undefined')
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? (async (secretKey, data) => {
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const hmac = node_crypto.createHmac('sha256', underlying(secretKey));
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hmac.update(underlying(data));
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return Bytes.from(hmac.digest().subarray(0, KEY_LENGTH));
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})
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: (async (_secretKey, _data) => {
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throw new Error('No HMAC SHA-256 available');
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});
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