How to pass inputs to a shell script in automator?
pass=$(osascript -e 'tell app (path to frontmost application as text)
text returned of (display dialog "Enter password:" default answer "")
end')
for f in "$@"; do
    printf %s "$pass" | openssl enc -aes-256-cbc -salt -in "$f" -out "${f%.*}.enc" -pass stdin
done