sh-dv / Hat.sh

https://hat.sh

hat.sh is a javascript app that provides secure file encryption using the AES-256-GCM algorithm from WebCryptoAPI provided by your browser. it was coded following the WebCrypto Documentations.

It's fast, secure and Serverless, the app never uploads the files to the server.

in a small amount of code the app can encrypt any type of files at any size within seconds.

To use the app all you have to do is Browse a file, Type a Decryption Key or Generate one through our secure key generator. and your encrypted file is ready to download.

V2.0 is coming soon.

How to use

just simply browse a file, type a decryption key or use our secure key generator, and encrypt or decrypt.

Offline Use

the app is cross-platform and is available to download on macOS , Windows and linux

Requirements

NodeJS and NPM

Browserify which lets you require('modules') in the browser by bundling up all of your dependencies.

Installation

Download or clone the repository

$ git clone https://github.com/sh-dv/hat.sh.git hat.sh

go to the app directory

cd [app directory]

open terminal and install the node modules that are in the package.json file

sudo npm install

after the packages are installed bundle main app.js and modules together in one file using Browserify

browserify src/js/app.js -o bundle.js

then start the app by running index.html

Browser Compatibility

We officially support the last two versions of every major browser. Specifically, we test on the following

• Chrome on Windows, macOS, and Linux , IOS, Android
• Firefox on Windows, macOS, and Linux
• Safari on iOS and macOS
• Edge on Windows
• IE 11 on Windows

for more info see WebCryptoAPI home page

Crypto Examples

AES-GCM - generateKey

  window.crypto.subtle.generateKey(
    {
      name: "AES-GCM",
      length: 256,
    },
    true,
    ["encrypt", "decrypt"]
  )
.then(function(key){
    console.log(key);
})
.catch(function(err){
    console.error(err);
});

AES-GCM - importKey

function importSecretKey(rawKey) {
    return window.crypto.subtle.importKey(
      "raw",
      rawKey,
      "AES-GCM",
      true,
      ["encrypt", "decrypt"]
    );
  }
.then(function(key){
    console.log(key);
})
.catch(function(err){
    console.error(err);
});

AES-GCM - exportKey

async function exportCryptoKey(key) {
    const exported = await window.crypto.subtle.exportKey(
      "raw",
      key
    )
.then(function(keydata){
    console.log(keydata);
})
.catch(function(err){
    console.error(err);
});

AES-GCM - encrypt

async function encryptMessage(key) {
    let encoded = getMessageEncoding();
    // The iv must never be reused with a given key.
    iv = window.crypto.getRandomValues(new Uint8Array(12));
    ciphertext = await window.crypto.subtle.encrypt(
            {
                name: "AES-GCM",
                iv: iv
            },
            key,
            encoded
        )
        .then(function (encrypted) {
            console.log(new Uint8Array(encrypted));
        })
        .catch(function (err) {
            console.error(err);
        });
}

AES-GCM - decrypt

async function decryptMessage(key) {
    let encoded = getMessageEncoding();
    let decrypted = await window.crypto.subtle.decrypt({
            name: "AES-GCM",
            iv: iv
        },
        key,
        ciphertext
       )
       .then(function (decrypted) {
            console.log(new Uint8Array(encrypted));
        })
        .catch(function (err) {
            console.error(err);
        });
}

Credits

zxcvbn.js for Smart Password Strength Estimation

bootstrap for the responsive css layout

font-awesome for the icons

License

Copyright (c) 2019 sh-dv