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s4parke/Digital Signature.sh

Last active August 14, 2019 20:01
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Server-side commands to create digital signature for image
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Digital Signature.sh
# Make a hash of the image data
openssl dgst -sha256 wreckage.jpg > digest.txt
# Make a hash of DC metadata from XMP sidecar file
xml sel -N dc="http://purl.org/dc/elements/1.1/" -t -m "//dc:title" -c . -m "//dc:creator" -c . -m "//dc:description" -c . -n gator-meta.jpg.xml | openssl dgst -sha256 >> digest.txt
# Sign and base64 encode the digest
openssl rsautl -sign -inkey private_key.pem -keyform PEM -in digest.txt | base64 > signature
# Put the signature into the XMP sidecar file
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