nakov

pragma solidity ^0.4.18;

contract Cert {
  mapping (string => bool) private certificateHashes;
  address contractOwner = msg.sender;

  function add(string hash) public {
    require (msg.sender == contractOwner);
    certificateHashes[hash] = true;
  }

nakov

const CryptoJS = require("crypto-js");
const EC = require('elliptic').ec;
const secp256k1 = new EC('secp256k1');

function signData(data, privKey) {
    let keyPair = secp256k1.keyFromPrivate(privKey);
    let signature = keyPair.sign(data);
    return [signature.r.toString(16), signature.s.toString(16)];
}

nakov

from pycoin.ecdsa import CurveFp, Point
from nummaster.basic import sqrtmod

def compress_key_pair(key_pair):
  return (key_pair.x(), key_pair.y() % 2)

def uncompress_key(curve, compressed_key):
  x, is_odd = compressed_key
  p, a, b = curve.p(), curve.a(), curve.b()
  y = sqrtmod(pow(x, 3, p) + a * x + b, p)

nakov

(async function() {

    let defaultDerivePath = "m/44'/60'/0'/0/0";

    let hdnode = require('ethers/wallet/hdnode');
    let ss = require('ethers/wallet/secret-storage');

    //let words = 'verb position snow palace gift limb citizen alpha stay sphere swear proof';
    let words = 'tiger guilt skill adjust worry rival roof bicycle raven mail cherry strong body afford again praise upper wolf dry joke web bargain sea hint';
    let entropy = hdnode.mnemonicToEntropy(words);

nakov

{
   "version":3,
   "id":"14ed6caf-0b69-4348-85e6-6ea0b15352cd",
   "address":"9ab14321b263d5c1a7715098a1a31510cb828409",
   "Crypto":{
      "ciphertext":"838cc6626170166b2ec15911e496b603da6c08de8ef188d9f0ef27fd84d0c572",
      "cipherparams":{
         "iv":"f6ed0a488d596de27adf087f9c9e6946"
      },
      "cipher":"aes-128-ctr",

nakov

{  
   "address": "cf4aa487dece1b7bd0b5c1495222931f02fab1f3",
   "id": "c24815ed-b06c-481f-bf0c-9747b18aac2d",
   "version": 3,
   "Crypto": {  
      "cipher": "aes-128-ctr",
      "cipherparams": {  
         "iv": "b5e531fc4a67e6665e5e0d4a500ef738"
      },
      "ciphertext": "8174066d494c46be31c59ef7fec1c6815c412e3762da68e76f7df263e6afee55",

nakov

There is a simple way to check the last events in GitHub from certain user, including all his "git push" events:

https://api.github.com/users/{user}/events

Exmaple: https://api.github.com/users/nakov/events

nakov

const CryptoJS = require("crypto-js");
const EC = require('elliptic').ec;
const secp256k1 = new EC('secp256k1');

function publicKeyToAddress(pubKey) {
    let address = CryptoJS.RIPEMD160(pubKey).toString();
    return address;
}

function privateKeyToPublicKey(privKey) {

nakov

npm install -g gitbook-cli
npm install -g serve

call gitbook install
call gitbook build . --log=debug --debug
start serve _book
start "" http://127.0.0.1:5000

pause

nakov

gitbook.events.bind("page.change", function() {
	let runCodeLinks = $("p:contains('Run the above code example:') a");
	for (let link of runCodeLinks) {
		if (typeof(link.href) == "string" && link.href.startsWith("https://repl.it/")) {
			// A repl.it link is found --> check for code box above it
			let codeBox = $(link).parent().prev();
			if (codeBox.is("pre")) {
				// A code box is found just before the code link --> inject the [Run] button
				let runButton = $("<a href='#' class='run-code-button' style='float:right'>Run</a>");
				let loadingBox = $("<span class='run-code-loading' style='float:right;display:none'>Loading …</span>");