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/*
GoToSocial
Copyright (C) GoToSocial Authors admin@gotosocial.org
SPDX-License-Identifier: AGPL-3.0-or-later
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
import sha256 from "./sha256";
let compute = async function(seedStr, challengeStr) {
const textEncoder = new TextEncoder();
let nonce = 0;
while (true) { // eslint-disable-line no-constant-condition
// Create possible solution string from challenge string + nonce.
const solution = textEncoder.encode(seedStr + nonce.toString());
// Generate hex encoded SHA256 hashsum of solution.
const hashArray = Array.from(sha256(solution));
const hashAsHex = hashArray.map(b => b.toString(16).padStart(2, "0")).join("");
// Check whether hex encoded
// solution matches challenge.
if (hashAsHex == challengeStr) {
return nonce;
}
// Iter.
nonce++;
}
};
onmessage = async function(e) {
console.log('worker started'); // eslint-disable-line no-console
// Compute nonce value that produces 'challenge' for seed.
let nonce = await compute(e.data.seed, e.data.challenge);
// Post the solution nonce back to caller.
postMessage({ nonce: nonce, done: true });
};
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