marcan2020

import zlib

# https://bugs.python.org/issue5784
shc_data = zlib.decompress(jws_parts[1], wbits=-15)

print("SHC Data:", shc_data)
# SHC Data: {"iss":"https://c19.cards/issuer","nbf":1591037940,"vc":{"type":["https://smarthealth.cards#covid19", ...

marcan2020

import base64

def decode(data):
  missing_padding = len(data) % 4
  if missing_padding:
      data += b'='* (4 - missing_padding)
  return base64.urlsafe_b64decode(data)

jws_parts = list(map(decode, jws.split(".")))

marcan2020

import re

qr_data = "shc:/5676290952432060346029243740..."
parts = re.findall('..', qr_data[5:])

jws = ""
for p in parts:
  jws += chr(int(p)+ 45)
  
print("jws:", jws)

marcan2020

const SMALLEST_B64_CHAR_CODE = 45; // "-".charCodeAt(0) === 45
const toNumericQr = (jws: string, chunkIndex: number, totalChunks: number): QRCodeSegment[] => [
  { data: 'shc:/' + ((totalChunks > 1) ? `${chunkIndex + 1}/${totalChunks}/` : ``), mode: 'byte' },
  {
    data: jws
      .split('')
      .map((c) => c.charCodeAt(0) - SMALLEST_B64_CHAR_CODE)
      .flatMap((c) => [Math.floor(c / 10), c % 10])
      .join(''),
    mode: 'numeric',

marcan2020

async signJws(idTokenPayload: Record<string, unknown>, deflate = true): Promise<string> {
    const bodyString = JSON.stringify(idTokenPayload);
    const fields = deflate ? { zip: 'DEF' } : {};
    const body = deflate ? pako.deflateRaw(bodyString) : bodyString;
    const signed = await jose.JWS.createSign({ format: 'compact', fields }, this.signingKey)
      .update(Buffer.from(body))
      .final();
    return (signed as unknown) as string;
}

marcan2020

Notable in Docker with network access disabled

This is not perfect but it works. Useful repo: https://github.com/jessfraz/dockerfiles

Required files

• Notable deb file is available on https://notable.app/#download
• .notable.json: https://gist.github.com/marcan2020/ee64d23fab07336798821139cbac221f
• chrome.json: https://github.com/jessfraz/dotfiles/blob/master/etc/docker/seccomp/chrome.json

marcan2020

{
        "monaco": {
                "editorOptions": {
                        "minimap": {
                                "enabled": false
                        },
                        "lineNumbers": "off",
                        "scrollBeyondLastLine": false,
                        "wordWrap": "bounded"
                }

marcan2020

#!/bin/bash

usage()
{
  echo "usage: $0 [-d DOMAIN -D DICTIONARY -o OUTFILE [-x code] [-xL length] | -h]"
}

if [[ $# -eq 0 ]] ; then
		usage
    exit 0