junderw

Generating Authy passwords on other authenticators

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There is an increasing count of applications which use Authy for two-factor authentication. However many users who aren't using Authy, have their own authenticator setup up already and do not wish to use two applications for generating passwords.

Since I use 1Password for all of my password storing/generating needs, I was looking for a solution to use Authy passwords on that. I couldn't find any completely working solutions, however I stumbled upon a gist by Brian Hartvigsen. His post had a neat code with it to generate QR codes for you to use on your favorite authenticator.

His method is to extract the secret keys using Authy's Google Chrome app via Developer Tools. If this was not possible, I guess people would be reverse engineering the Android app or something like that. But when I tried that code, nothing appeared on the screen. My guess is that Brian used the

junderw

// Mimics Buffer.from(x, 'hex') logic
// Stops on first non-hex string and returns
// https://github.com/nodejs/node/blob/v14.18.1/src/string_bytes.cc#L246-L261
Uint8Array.fromHex = function (hexString) {
  const MAP_HEX = {0:0,1:1,2:2,3:3,4:4,5:5,6:6,7:7,8:8,9:9,a:10,b:11,c:12,d:13,e:14,f:15,A:10,B:11,C:12,D:13,E:14,F:15};
  const bytes = new this(Math.floor((hexString || "").length / 2));
  let finalLen = bytes.length;
  for (let i = 0; i < finalLen; i++) {
    const a = MAP_HEX[hexString[i * 2]];
    const b = MAP_HEX[hexString[i * 2 + 1]];

junderw

# This is one big command. Fill it out in a text editor and copy-paste
# the whole thing to get tls.key and tls.cert files for use with lnd

openssl \
  req \
  -newkey ec:<(openssl ecparam -name prime256v1) \
  -nodes `# No password` \
  -keyout \
  tls.key `# private key filename` \
  -x509 \

junderw

/*
 * input: "wpkh([d34db33f/84h/0h/0h]0279be667ef9dcbbac55a06295Ce870b07029Bfcdb2dce28d959f2815b16f81798)"
 * output: "wpkh([d34db33f/84h/0h/0h]0279be667ef9dcbbac55a06295Ce870b07029Bfcdb2dce28d959f2815b16f81798)#qwlqgth7"
 * (This has been checked to match bitcoin-core)
 */
function descriptorChecksum(desc) {
  if (!(typeof desc === 'string' || desc instanceof String)) throw new Error('desc must be string')

  const descParts = desc.match(/^(.*?)(?:#([qpzry9x8gf2tvdw0s3jn54khce6mua7l]{8}))?$/);
  if (descParts[1] === '') throw new Error('desc string must not be empty')

junderw

class CBOREncoder {
  private entryCount: number = 0;
  private data: Uint8Array = Uint8Array.from([]);

  pushBool(key: string, value: boolean): void {
    this.entryCount++;
    this.pushTextInternal(key);
    this.pushBoolInternal(value);
  }

junderw

var POW31 = 0x80000000
var MSK31 = 0x7FFFFFFF

function checkBitSize(bs) {
    if (bs > 53 || bs < 1 || Math.floor(bs) !== bs) {
        throw new Error('Invalid Bit Size')
    }
}

function splitBits(val, size) {

junderw

# Get rid of remotes
git fetch --prune --all

# Check branches for stuff you might want to keep
# This will show branches that are NOT on the remote for origin or upstream
git branch | grep -v "$(git branch --remote | grep -e "origin/\|upstream/" | grep -v "\->" | cut -d/ -f2)"

# Here's another one to check. checks your local master and gives any branches that are merged to master
git branch --merged=master | grep -v master

junderw

async function aesEncrypt(data, password, difficulty = 10) {
  const hashKey = await grindKey(password, difficulty)
  const iv = await getIv(password, data)

  const key = await window.crypto.subtle.importKey(
    'raw',
    hashKey, {
      name: 'AES-GCM',
    },
    false,

junderw

#!/bin/bash

SELECTION=$1
if [ -z "$1" ]
  then
    SELECTION="JPN"
fi

# Default JPN
CODE=108

junderw

// Usage:
// getByteCount({'MULTISIG-P2SH:2-4':45},{'P2PKH':1}) Means "45 inputs of P2SH Multisig and 1 output of P2PKH"
// getByteCount({'P2PKH':1,'MULTISIG-P2SH:2-3':2},{'P2PKH':2}) means "1 P2PKH input and 2 Multisig P2SH (2 of 3) inputs along with 2 P2PKH outputs"
function getByteCount(inputs, outputs) {
    var totalWeight = 0
    var hasWitness = false
    var inputCount = 0
    var outputCount = 0
    // assumes compressed pubkeys in all cases.
    var types = {