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srihash - generate Subresource Integrity Digests from the command line

Subresource Integrity is a browser feature that allows you to specify the hash of a resource being loaded by your webpage. This allows you to more safely use CDN-distributed content. For more information, see Subresource Integrity on MDN.

Usage

~$ srihash https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css
sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7

~$ srihash validator.min.js
sha384-rL4GxM2e1/80hvGv4D2buQErmXQZi3AjwzlJe/znZjBf0KPfIUydKpSi38QVkzY/

You can then add the integrity attribute to your tags like so:

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" type="text/css" integrity="sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7" crossorigin="anonymous">
<script type="text/javascript" src="validator.min.js" integrity="sha384-rL4GxM2e1/80hvGv4D2buQErmXQZi3AjwzlJe/znZjBf0KPfIUydKpSi38QVkzY/" crossorigin="anonymous"></script>

Installation

Copy the file srihash to your bin location of choice. Requires the bash, curl or wget, and opensl commands to be installed.