Bug#888162: cryptsetup: `loopaesOpen --key-file=-` doesn't read the key from stdin but tries to open key file "./-"

[Milan Broz]

Fixed upstream in
https://gitlab.com/cryptsetup/cryptsetup/commit/8728ba08e2e056a4c18b55407146eea7ac0043c6

It would be nice if this patch is on added on top of 2.0.1 in Debian ;-)

In the meantime, you can trick the cryptsetup2 to use stdin just specifying 
"--key-file /dev/stdin"
instead of "--key-file -".

Thanks,
Milan