xotp/dist/encoding/uint8.js

One-Time Password (HOTP/TOTP) library for Node.js, Deno and Bun, with support for Google Authenticator.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.uintEncode = uintEncode;
exports.uintDecode = uintDecode;
exports.uint64Encode = uint64Encode;
exports.uint64Decode = uint64Decode;
function uintEncode(num) {
    const bytes = new Uint8Array(8).fill(0);
    for (let i = 7; i >= 0; i--) {
        bytes[i] = num & 0xff;
        // Shift 8 bits to the right and rounds down the result!
        // NOTE: Right shift (>>) operator only works on 32-bit
        // integers, but `num` could be an 8-byte integer!
        num = (num / Math.pow(2, 8)) | 0;
    }
    return bytes;
}
function uintDecode(bytes) {
    let num = 0;
    let arr = bytes;
    if (bytes instanceof Buffer) {
        arr = new Uint8Array(bytes);
    }
    for (let i = 0; i < arr.length; i++) {
        num = num * Math.pow(2, 8) + arr[i];
    }
    return num;
}
function uint64Encode(num) {
    let int64Num = BigInt(num);
    const bytes = new Uint8Array(8);
    const dataView = new DataView(bytes.buffer);
    dataView.setBigInt64(0, int64Num);
    return bytes;
}
function uint64Decode(bytes) {
    let arr = bytes;
    if (bytes instanceof Buffer) {
        arr = new Uint8Array(bytes);
    }
    const dataView = new DataView(arr.buffer);
    return dataView.getBigUint64(0);
}