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fbeeper/shachecksumallthethings.md

Last active August 29, 2015 14:18
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SHA checksum all the things!
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shachecksumallthethings.md

SHA Checksum your files right from Finder

Just as an exercise (+ lazyness, + lack of memory) I created this service (Automator workflow) to generate SHA checksums right from the Finder.

Jut get it...

curl -O https://dl.dropboxusercontent.com/u/2331589/checksumallthethings.tar.gz

Check it...

echo "51dc69ef7561108ebd506f6b34c03c18ca08bba3efe6bdb06c2ce043585a6f78 *checksumallthethings.tar.gz" | shasum -c -a 256

And if everything looks fine...

tar xfz checksumallthethings.tar.gz -C ~/Library/Services/; rm checksumallthethings.tar.gz

Then you'll find the new option in the contextual menu under Services > SHA checksum while selecting files or folders* in Finder.

* please note that folders will not checksum, but I haven't found a way to filter them without using the too specific 'documents' filter.

Dropbox and checksums

While doing this I noticed an interesting thing. If you share files from your Public folder as you download them, checksum does not mutate. Alternatively, if you share your file from other folders, every time you download the app... the checksum changes, making impossible to check your download autenticity based on checksums.

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