Office Whisperer

const SHORT_TO_HEX = {}; const HEX_TO_SHORT = {}; for (let i = 0; i < 256; i++) { let encodedByte = i.toString(16).toLowerCase(); if (encodedByte.length === 1) { encodedByte = `0${encodedByte}`; } SHORT_TO_HEX[i] = encodedByte; HEX_TO_SHORT[encodedByte] = i; } export function fromHex(encoded) { if (encoded.length % 2 !== 0) { throw new Error("Hex encoded strings must have an even number length"); } const out = new Uint8Array(encoded.length / 2); for (let i = 0; i < encoded.length; i += 2) { const encodedByte = encoded.slice(i, i + 2).toLowerCase(); if (encodedByte in HEX_TO_SHORT) { out[i / 2] = HEX_TO_SHORT[encodedByte]; } else { throw new Error(`Cannot decode unrecognized sequence ${encodedByte} as hexadecimal`); } } return out; } export function toHex(bytes) { let out = ""; for (let i = 0; i < bytes.byteLength; i++) { out += SHORT_TO_HEX[bytes[i]]; } return out; }