77 lines
1.7 KiB
TypeScript
77 lines
1.7 KiB
TypeScript
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import { createWriteStream } from "node:fs";
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const fileName = "./passwords.json";
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export async function getPasswordFor(level: number): Promise<string | null> {
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try {
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const file = Bun.file(fileName);
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const data = await file.json();
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return data[`natas${level}`];
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} catch (e) {
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return null;
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}
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}
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export async function savePassword(
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level: number,
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password: string
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): Promise<void> {
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let data = {};
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try {
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const file = Bun.file(fileName);
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data = await file.json();
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} catch (e) {}
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data[`natas${level}`] = password;
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createWriteStream(fileName).end();
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await Bun.write(fileName, JSON.stringify(data, null, 2));
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}
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export function hex2bin(hex: string): number[] {
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const buf = [];
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for (let i = 0; i < hex.length; i += 2) {
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const byte = hex.slice(i, i + 2);
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buf.push(parseInt(byte, 16));
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}
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return buf;
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}
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export function bytes2str(bytes: number[]): string {
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return bytes.map((c) => String.fromCharCode(c)).join("");
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}
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export function xor(str: string, key: string | number[]): number[] {
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const result = [];
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str.split("").forEach((c, idx) => {
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const pIdx = idx % key.length;
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let c2;
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if (typeof key === "string") c2 = key.charCodeAt(pIdx);
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else c2 = key[pIdx];
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result.push(c.charCodeAt(0) ^ c2);
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});
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return result;
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}
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export function determinePeriod(
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arr: number[],
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threshold: number = 1,
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limit: number = 50
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): number {
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let period = 1;
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let lowest = null;
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while (period < limit) {
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let sum = 0;
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for (let i = period; i < arr.length; i++) {
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sum += arr[i] ^ arr[i - period];
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}
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console.log(period, sum);
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if (sum === 0) return period;
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if (lowest === null || sum < lowest[0]) lowest = [sum, period];
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period += 1;
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}
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if (lowest <= threshold) return lowest[1];
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}
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