decryptStream(passphrase)

Decrypts a readable stream

Argument	Type	Description	Required
passphrase	String	Your decryption passphrase	Yes

Example using an already encrypted file from local disk

This example will save the file to local disk in a stream. This code is to be used within your local application

function decryptFile(passphrase) {
//Get the encrypted file from the html input element
//This will not start reading the file, it will only get a reference to it.

const fileInput = document.getElementById('fileInput');
//Convert to stream

    const fileStream = file.stream();
    
//Setup the File API save file picker
   const fileHandle = await window.showSaveFilePicker({
        suggestedName: `${fileName}`,
        startIn: "downloads",
      });
 
  //Setting up pipeline
  const writable = await fileHandle.createWritable();
  const decryptStream = await secure.decryptStream(passphrase);
//Start the pipeline
await fileStream.pipeThrough(decryptStream).pipeTo(writable);

}

Example using a encrypted file from a S3 bucket

import {
  S3Client,GetObjectCommand,
} from "@aws-sdk/client-s3";

`
const client = new S3Client({
  region: "ap-east-1",
  credentials: {
    accessKeyId: env
    secretAccessKey: env
  },
});

//Never put your  S3 keys on the client side, this is just an example, it is better to use a signature url

// Setup your S3 bucket

function decryptFileS3(passphrase) {
//Asumme you have the key of the S3 file from your other methods

const Key = 'Your aws s3 path to your file object'

 try {
    const fileHandle = await window.showSaveFilePicker({
      suggestedName: Key,
      startIn: "downloads",
    });
//Setup the writable stream
    const writable = await fileHandle.createWritable();

//S3 Commands
    const dl = new GetObjectCommand(params);
    const response = await client.send(dl)
    const Body = response.Body;

// Set up the pipeline

  const decryptStream = await secure.decryptStream(passphrase);
  
//Start the pipeline streams from S3, decrypts, to you local disk

 await Body.pipeThrough(decryptStream).pipeTo(writable);

} catch(e) {
console.log(e)
}