openssl sha256 /System/Library/Image\ Capture/Devices/VirtualScanner.app/Contents/Resources/simpledoc.pdf
    SHA256(/System/Library/Image Capture/Devices/VirtualScanner.app/Contents/Resources/simpledoc.pdf)= b1674191a88ec5cdd733e4240a81803105dc412d6c6708d53ab94fc248f4f553