Mawoka
60 lines
1.7 KiB
TypeScript
60 lines
1.7 KiB
TypeScript
/*
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* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/.
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*/
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import { DateTime } from 'luxon';
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const gen_salt = (l: number): string => {
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const chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
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const charLength = chars.length;
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let result = '';
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for (let i = 0; i < l; i++) {
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result += chars.charAt(Math.floor(Math.random() * charLength));
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}
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return result;
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};
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export const mint = async (
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resource: string,
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bits = 16,
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// now = null,
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ext = '',
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saltchars = 8,
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stamp_seconds = false
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): Promise<string> => {
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bits = 8;
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const ver = '1';
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let ts;
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if (stamp_seconds) {
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ts = DateTime.now().toFormat('yyMMddHHmmss');
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} else {
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ts = DateTime.now().toFormat('yyMMdd');
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}
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const hex_digits = Math.ceil(bits / 4);
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const zeros = '0'.repeat(hex_digits);
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const salt = gen_salt(saltchars);
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const challenge = `${ver}:${bits}:${ts}:${resource}:${ext}:${salt}`;
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let counter = 0;
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let result: string;
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const t1 = performance.now();
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// eslint-disable-next-line no-constant-condition
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while (true) {
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const data = new TextEncoder().encode(`${challenge}:${counter.toString(16)}`);
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const hashBuffer = await crypto.subtle.digest('SHA-1', data);
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const hashArray = Array.from(new Uint8Array(hashBuffer));
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const digest = hashArray.map((b) => b.toString(16).padStart(2, '0')).join('');
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if (digest.slice(0, hex_digits) == zeros) {
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result = counter.toString(16);
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break;
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}
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counter += 1;
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}
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const t2 = performance.now();
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// eslint-disable-next-line no-undef
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plausible('Hashcash', { props: { ms_taken: t2 - t1 } });
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return `${challenge}:${result}`;
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};
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