Tips for securing a large file with the AES-CBC algorithm while including an encryption progress/status indicator

Question

Tips for securing a large file with the AES-CBC algorithm while including an encryption progress/status indicator

I am utilizing nodejs' built-in crypto, zlib, and fs packages to encrypt a sizeable file with the following code:

import fs from 'fs';
import zlib from 'zlib';
import crypto from 'crypto';

const initVect = crypto.randomBytes(16);
const fread = fs.createReadStream('X:/File.mp4');
const fwrite = fs.createWriteStream('X:/File.mp4.enc');
const gzipStream = zlib.createGzip();
const hashedPassword = crypto.createHash('sha256').update('SomePassword').digest();
const cipher = crypto.createCipheriv(
    'aes-256-cbc',
    hashedPassword,
    initVect
);

fread.pipe(gzipStream).pipe(cipher).pipe(fwrite);

However, I am unsure how to implement an encryption progress/status indicator. As encrypting a large file will take considerable time, I wish to display the encryption progress in the console for the user's benefit.

Could anyone provide guidance on achieving this?

javascript typescript encryption aes

Answer 1

Answer №1

To implement this functionality, utilize the stream method Transform(). Start by creating a new stream using Transform(), extract the processed chunk length, then compute the progress based on the chunk length and file size. Finally, integrate this new transform into your current pipeline.

Here is an example of how to achieve this:

import fs from 'fs';
import zlib from 'zlib';
import crypto from 'crypto';
import { TransformCallback, Transform } from 'stream';

const initVect = crypto.randomBytes(16);
const fread = fs.createReadStream('X:/File.mp4');
const fwrite = fs.createWriteStream('X:/File.mp4.enc');
const gzipStream = zlib.createGzip();
const hashedPassword = crypto.createHash('sha256').update('SomePassword').digest();
const cipher = crypto.createCipheriv(
    'aes-256-cbc',
    hashedPassword,
    initVect
);

const fileSize = fs.statSync(fread.path).size;
let processedBytes = 0;
const progressPipe = new Transform({
    transform(
        chunk: Buffer,
        _encoding: BufferEncoding,
        callback: TransformCallback
    ) {
        processedBytes += chunk.length;
        console.log(
            `${Math.floor((processedBytes / fileSize) * 100)}%`
        );
        this.push(chunk);
        callback();
    },
});

fread.pipe(progressPipe).pipe(gzipStream).pipe(cipher).pipe(fwrite);

Answer 2

To implement this functionality, utilize the stream method Transform(). Start by creating a new stream using Transform(), extract the processed chunk length, then compute the progress based on the chunk length and file size. Finally, integrate this new transform into your current pipeline.

Here is an example of how to achieve this:

import fs from 'fs';
import zlib from 'zlib';
import crypto from 'crypto';
import { TransformCallback, Transform } from 'stream';

const initVect = crypto.randomBytes(16);
const fread = fs.createReadStream('X:/File.mp4');
const fwrite = fs.createWriteStream('X:/File.mp4.enc');
const gzipStream = zlib.createGzip();
const hashedPassword = crypto.createHash('sha256').update('SomePassword').digest();
const cipher = crypto.createCipheriv(
    'aes-256-cbc',
    hashedPassword,
    initVect
);

const fileSize = fs.statSync(fread.path).size;
let processedBytes = 0;
const progressPipe = new Transform({
    transform(
        chunk: Buffer,
        _encoding: BufferEncoding,
        callback: TransformCallback
    ) {
        processedBytes += chunk.length;
        console.log(
            `${Math.floor((processedBytes / fileSize) * 100)}%`
        );
        this.push(chunk);
        callback();
    },
});

fread.pipe(progressPipe).pipe(gzipStream).pipe(cipher).pipe(fwrite);

Tips for securing a large file with the AES-CBC algorithm while including an encryption progress/status indicator

Answer №1

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