🧮 File hash calculator

This repo contains many functions that are used for hash calculation from file content. The calculated has is used to verify or check the file's integrity while uploading that to a server and so we can determine if the file had or not been corrupted, modified or missing part of its content.

🤓 Usage

Clone this repo
Or copy code from the source
Check some codes in Example section
Send the calculated hash from file from client to the server while uploading the file. So that calculate in your server the hash too and just compare the two hashes. If those are same so that you're good and your file has been successfully uploaded without any errors 🥳🤩.

Example of calculating hash

VanillaJS

client/index.html

<form id="my-form">
    <input type="file" name="file" id="file">
    <br><br>
    <button type="submit">Hash</button>
</form>

<p id="status"></p>

<script src="hash.js"></script>
<script src="divide-file.js"></script>
<script src="main.js"></script>

client/main.js

/* Variables */
const CHUNKSIZE = 1024 * 1024 * 100   // 100 Mo

const statusElement = document.getElementById('status')

const form = document.getElementById('my-form')

form.addEventListener('submit', async e => {
    e.preventDefault()
    try {
        if (!form['file'].files[0]) throw new Error('File not provided')
        else {
            statusElement.innerText = 'Calculating hash...'
            
            const file = form['file'].files[0]
            const reader = new FileReader()
            reader.readAsArrayBuffer(file)
            getFileHashSignature(reader, CHUNKSIZE, file.size)
                .then(filehash => {
                    statusElement.innerText = 'HASH: ' + filehash
                })
                .catch(console.error)
        }
    } catch (err) { throw err }
})

NodeJS

The generateFileHashSignature function can be located at nodejs/index.js

generateFileHashSignature(filepath, chunksize).then(hash => console.log(hash))
//  1e08568ce1aaed8ab0d8d13951c0ebbdcea7602faa31c378105a7ddf73161710

Disclaimer

Matroska or .mkv still not supported.
A npm package will be created soon.