Subresource Integrity hash generator for laravel
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Laravel Subresource Integrity

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Small laravel 5.5+ package that'll generate the integrity hashes for your style and script files.

About Subresources Integrity

From MDN:

Subresource Integrity (SRI) is a security feature that enables browsers to verify that files they fetch (for example, from a CDN) are delivered without unexpected manipulation. It works by allowing you to provide a cryptographic hash that a fetched file must match.

Troy Hunt wrote an article speaking on the subject, you can read it here


$ composer require elhebert/laravel-sri

This package uses auto-discovery, so you don't have to do anything. It works out of the box.


If you want ot make changes in the configuration you can publish the config file using

$ php artisan vendor:publish --provider="Elhebert\SubresourceIntegrity\SriServiceProvider"

Content of the configuration

key default value possible values
base_path base_path('/public')
algorithm sha256 sha256, sha384 and sha512
hashes [] (see "How to get a hash)
mix_sri_path public_path('mix-sri.json') (see "How to get a hash)


To only get a hash, use Sri::hash:

    href="{{ asset('css/app.css') }}"
    integrity="{{ Sri::hash('css/app.css') }}"

To generate the HTML for the integrity and the crossorigin attributes, use Sri::html. It accepts two parameters:

  • first one is the path;
  • second one (default is false) tells if you want to pass the credentials when fetching the resource.
    href="{{ asset('css/app.css') }}"
    {{ Sri::html('css/app.css') }}

Blade directive

Two blade directive are available to make your views cleaner:

Use @mixSri to generate the <link> or <script> tag with the proper attributes and using the mix() helper to generate the asset path:

@mixSri(string $path, bool $useCredentials = 'false')

Use @assetSri to generate the <link> or <script> tag with the proper attributes and using the asset() helper to generate the asset path:

@assetSri(string $path, bool $useCredentials = 'false')

How to get a hash

Store hashes in the configuration

You can references the assets in the configuration like this:

    // ...

    'hashes' => [
        'css/app.css' => 'my_super_hash'
        '' => 'sha256-FgpCb/KJQlLNfOu91ta32o/NMZxltwRo8QtmkMRdAu8='

This means, you have to calculate the hashes yourself. To do this, you can use, mozilla hash generator or any other resource available.

Using a webpack (or Mix) plugin to generate hashes on build

It expect a mix-sri.json file with a similar structure to the mix-manifest.json:

    "/css/app.css": "my_super_hash",
    "/js/app.js": "my_super_hash",

The filename and path can be changed in the configuration at any time.

Self promotion: I made a Laravel Mix extension laravel-mix-sri for this purpose.

Generate them on the fly

If it can't find the asset hash in the config file nor in the mix-sri.json file, it'll generate the hash on each reload of the page.

This method is the least recommended, because it reduce performance and make your page load slower.

Remote resources

This package also work for remote resources. Be careful that resources like Google Fonts won't work.

    integrity="{{ Sri::hash('') }}"


Please see CONTRIBUTING for more details.


This project and the Laravel framework are open-sourced software licensed under the MIT license.