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Encrypt/Decrypt files in your browser

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Pure Javascript implementation of the cipher used in rclone (crypt-mount).

Installation

Node

npm install rclone

Browser

You can find a browser bundle here: https://unpkg.com/rclone/dist/rclone.umd.min.js
Use window.rclone.Rclone to access the constructor function.

Getting Started

Examples

Encrypt/Decrypt Paths

import { Rclone } from 'rclone';

// Create Rclone instance 
Rclone({
    password: 'UmyLSdRHfew6aual28-ggx78qHqSfQ',
    salt: 'Cj3gLa5PVwc2aot0QpKiOZ3YEzs3Sw'
})
.then(rclone => { 
   
  // Decryption
  console.log(
    rclone.Path.decrypt("dk7voi2247uqbgbuh439j13eo0/p0q5lhi767fsplsdjla7j7uv60") // Hello World
  );
  
  // Encryption
  console.log(
    rclone.Path.encrypt("Hello/World") // dk7voi2247uqbgbuh439j13eo0/p0q5lhi767fsplsdjla7j7uv60
  );
  
})
.catch(error => {
  // Catch error creating rclone instance 
})

Decrypt Files

Concept

To decrypt files in the browser rclone-js is using a node concept called Streams in the browser using readable-stream. You can create a decrypting ReadableStream by using the function rclone.File.createReadStream which will take a function that needs to return a ReadableStream representing the decrypted file. To provide random access rclone will pass an options object to the function like used by the node fs module. An important additon to these options is the chunkSize propertie, it is needed because rclone uses a block cipher and can only operate on a integer multiple of this size. These options need to be taken into account for the creation of the underyling ReadableStream returned from the function.

Example

Using fetch and range headers to decrypt files from amazon s3

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Encrypt/Decrypt files in your browser

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