nakov
/ mnemonic-ethers-js-example.js
Created
April 11, 2018 10:01
Encrypt / Decrypt Mnemonic words as JSON
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| (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
/ UTC--2018-04-13T16-43-44.558Z--9ab14321b263d5c1a7715098a1a31510cb828409.json
Created
April 13, 2018 16:45
Ethereum UTC / JSON Encrypted Wallet - Example
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| { | |
| "version":3, | |
| "id":"14ed6caf-0b69-4348-85e6-6ea0b15352cd", | |
| "address":"9ab14321b263d5c1a7715098a1a31510cb828409", | |
| "Crypto":{ | |
| "ciphertext":"838cc6626170166b2ec15911e496b603da6c08de8ef188d9f0ef27fd84d0c572", | |
| "cipherparams":{ | |
| "iv":"f6ed0a488d596de27adf087f9c9e6946" | |
| }, | |
| "cipher":"aes-128-ctr", |
nakov
/ UTC--2018-05-13T16-42-44.0Z--cf4aa487dece1b7bd0b5c1495222931f02fab1f3.json
Last active
May 13, 2018 16:49
HD wallet, exported as UTC / JSON using Ethers.js
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| { | |
| "address": "cf4aa487dece1b7bd0b5c1495222931f02fab1f3", | |
| "id": "c24815ed-b06c-481f-bf0c-9747b18aac2d", | |
| "version": 3, | |
| "Crypto": { | |
| "cipher": "aes-128-ctr", | |
| "cipherparams": { | |
| "iv": "b5e531fc4a67e6665e5e0d4a500ef738" | |
| }, | |
| "ciphertext": "8174066d494c46be31c59ef7fec1c6815c412e3762da68e76f7df263e6afee55", |
nakov
/ GitHub Last Push Date Check
Created
October 10, 2018 22:47
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| 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
/ HD-wallet-create-new.js
Created
November 4, 2018 20:39
Crypto Wallets: A Technical Perspective (Nakov at OpenFest 2018) - JavaScript Code Examples
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| let ethers = require('ethers'); | |
| let rnd256Bits = ethers.utils.randomBytes(256 / 8); | |
| let mnemonics = ethers.HDNode.entropyToMnemonic(rnd256Bits); | |
| let hdWallet = ethers.HDNode.fromMnemonic(mnemonics); | |
| console.log("Wallet mnemonics:", mnemonics); | |
| for (let index=0; index<5; index++) { | |
| let key = hdWallet.derivePath(`m/44'/60'/0'/0/${index}'`); | |
| console.log(`Private key #${index}: ${key.privateKey}`); |
nakov
/ AES-256-CTR-Argon2-HMAC-SHA256-example.js
Last active
November 9, 2023 02:32
Cryptography for JavaScript Developers: Hashes, HMAC, PBKDF2, Scrypt, Argon2, AES-256-CTR, ECDSA, EdDSA, secp256k1, Ed25519
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| const aes = require("aes-js"); | |
| const argon2 = require("argon2"); | |
| const crypto = require("crypto"); | |
| const cryptoJS = require("crypto-js"); | |
| // Encrypt using AES-256-CTR-Argon2-HMAC-SHA-256 | |
| async function aes256ctrEncrypt(plaintext, password) { | |
| let argon2salt = crypto.randomBytes(16); // 128-bit salt for argon2 | |
| let argon2Settings = { type: argon2.argon2di, raw: true, | |
| timeCost: 8, memoryCost: 2 ** 15, parallelism: 2, |
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| 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 |
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| 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>"); |
nakov
/ select-replace.sql
Last active
November 25, 2019 10:14
MySQL Find / Replace in the Database via SQL commands
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| SELECT REPLACE(post_title, " ", " ") FROM wp_posts |
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| <!doctype html> | |
| <html> | |
| <head> | |
| <meta charset="UTF-8"> | |
| <script src="kinvey-example.js"></script> | |
| </head> | |
| <body> | |
| <a id='buttonLoad' href='#'>[Load]</a> |