TOTPFit/lib/protobuf-decoder/hexUtils.js

import { Buffer } from "buffer";

export function parseInput(input) {
    const normalizedInput = input.replace(/\s/g, "");
    const normalizedHexInput = normalizedInput.replace(/0x/g, "").toLowerCase();
    if (isHex(normalizedHexInput)) {
        return Buffer.from(normalizedHexInput, "hex");
    } else {
        return Buffer.from(normalizedInput, "base64");
    }
}

export function isHex(string) {
    let result = true;
    for (const char of string) {
        if (!((char >= "a" && char <= "f") || (char >= "0" && char <= "9"))) {
            result = false;
        }
    }
    return result;
}

export function bufferLeToBeHex(buffer) {
    let output = "";
    for (const v of buffer) {
        const hex = v.toString(16);
        if (hex.length === 1) {
            output = "0" + hex + output;
        } else {
            output = hex + output;
        }
    }
    return output;
}

export const bufferToPrettyHex = (b) =>
    [...b].map((c) => c.toString(16).padStart(2, "0")).join(" ");