Integrity for HTML links in Bash

integrity.sh

# Add this function to your ~/.bashrc

# Calculates SHA384 integrity attribute given a URL

function integrity {
  echo sha384-`curl -s $1 | openssl dgst -sha384 -binary | openssl base64 -A`
}

# Documentation
#
# Example:
# $ integrity https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.13/semantic.min.css
# sha384-370KB8zqOlHxys9dcOyC7aCeXVtGyiKkWkp+cn8Mfoi13/sPj7fvSuhKRRdFbcip
# 
# Can be used like this in your HTML:
# <link href="https://cdnjs.cloudflare.com/ajax/libs/semantic-ui/2.2.13/semantic.min.css" rel="stylesheet" crossorigin="anonymous" 
#    integrity="sha384-370KB8zqOlHxys9dcOyC7aCeXVtGyiKkWkp+cn8Mfoi13/sPj7fvSuhKRRdFbcip">
# 
# See also: https://www.srihash.org/