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waleedsamy/sri.bash

Created September 21, 2015 07:59
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Subresource Integrity - SRI
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sri.bash
## http://www.w3.org/TR/SRI
## modern browser chrome 45+ or firefix 43+ will check hash of javascript or css resource
## aginst new attribute 'integrity' and if not matched browser will not load this resources
alg=sha256
resource=resource.css;
integrity=$(cat $resource | openssl dgst -$alg -binary | openssl enc -base64 -A)
printf '<link rel="stylesheet" href="resource.css" integrity="%s%s">\n' "$alg-$integrity"
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