James-E-A

### RSA textbook-ish walkthrough ###

# This is WORK IN PROGRESS.
# Intend to cover:
# -- "RSA uses numbers, not words?" (DONE)
# -- RSA ACTUAL MATH FORMULA (DONE)
# -- Hybrid encryption (TODO)
# -- Asymmetric padding (TODO)
# -- Forward secrecy, part 1 (TODO)
# -- Encapsulation protocols (TODO)

James-E-A

await (n =>
  fetch('https://qrng.anu.edu.au/API/jsonI.php?' + new URLSearchParams({length: n, type: 'uint8'}))
  .then(response => {if (!response.ok) {throw response}; return response.json();})
  .then(result => new Uint8Array(result['data']))
)
(32);

// https://quantumnumbers.anu.edu.au/pricing
await (key =>
  (n =>

James-E-A

/**
  * Get an element by XPath.
  * Includes workaround for browser bug not allowing SVG elements to be selected; use the virtual "_" prefix to reference the context node's namespace.
  * @param {string} expression - A string representing the XPath to be evaluated.
  * @param {Node|Document} [contextNode] - The context node.
  * @param {XPathEvaluator|Document} [document] - The document via which evaluate() will be called. Defaults to the context node's document, if specified; otherwise globalThis.document. Required if context node and globalThis.document are both absent.
  * @param {boolean} [ordered=true] - Whether to return the "first" node selected by the expression. If false, allows the XPath engine to return an arbitrary node selected by the expression.
  * @returns {?Node}
  */
export function getElementByXPath(expression, contextNode, document, ordered=true) {

James-E-A

function bn_powMod(a, e, m) {
  // h/t https://umaranis.com/2018/07/12/calculate-modular-exponentiation-powermod-in-javascript-ap-n/
  if (m === 1n)
    return 0n;
  if (e < 0n)
    return bn_powMod(bn_modInv(a, m), -e, m);
  for (var b = 1n; e; e >>= 1n) {
    if (e % 2n === 1n)
      b = (b * a) % m;
    a = (a * a) % m;

James-E-A

#!/usr/bin/env python3
import hashlib

b = 256
q = 2**255 - 19
l = 2**252 + 27742317777372353535851937790883648493

def H(m):
  return hashlib.sha512(m).digest()

James-E-A

#!/bin/sh
otheruser="$(id -nu 1000)"

xhost "+SI:localuser:${otheruser}"

if pulseaudio --check; then
	pax11publish -S "/run/user/$(id -u)/pulse/native" -e
	setfacl -m "u:${otheruser}:x" "/run/user/$(id -u)" "/run/user/$(id -u)/pulse"
	setfacl -m "u:${otheruser}:rw" "/run/user/$(id -u)/pulse/native"
	setfacl -m "m::rwx" "/run/user/$(id -u)/pulse"

James-E-A

perl -0pe 's/^\s*(\S+)\s\[(.*?)\s*\]:\s+(.*)\n\s*(.*)/\1\t\2\t\3\t\4/gm' /proc/asound/cards # | cut -f"${fieldIndex-1}"
# fieldIndex: 1=ID; 2=Type; 3=Name; 4=Description

James-E-A

// James Edington <[email protected]>
// ht https://wunkolo.github.io/post/2020/05/pclmulqdq-tricks/
// h/t https://en.wikipedia.org/wiki/Carry-less_product

function clmul(a, b) {
    const ONE = Object.getPrototypeOf(a).constructor(1)
    const a_bit_length = a.toString(2).length;
    let result = Object.getPrototypeOf(ONE).constructor(0);
    for ( let i = 0 ; i < a_bit_length ; i++ ) {
        result ^= b*(a & ONE<<i);

James-E-A

from operator import eq as _eq
from itertools import starmap as _starmap, chain as _chain, repeat as _repeat

def _istartswith(a, b):
    """
    Returns True if every element of b is equal to the zip-corresponding element of a;
    returns False otherwise, including in the event that a has fewer elements than b.
    """
    return all(_starmap(_eq, zip(_chain(a, _starmap(object, _repeat(()))), b)))

James-E-A

import functools
from .. import NORMALIZE_FUNC, EXPENSIVE_API_CALL

@(lambda t: lambda f: functools.wraps(f)(lambda x: f(t(x))))(NORMALIZE_FUNC)
@functools.lru_cache
def f(x):
  return EXPENSIVE_API_CALL(x)