Linux – How to install OpenSSL on the Windows Subsystem for Linux (WSL)

windows-subsystem-for-linux

I'm trying to decode a file using the bash command

openssl enc -d -aes256 -in blah.tar.gz.enc | tar xz

I'm running that from bash on Windows 10 using the terminal that comes with Git (I think that's Cygwin and MinTTY?) but it is too slow (and silent) so I wanted to try using the Windows Subsystem for Linux (WSL). However I do not have openssl in my Debian WSL and I cannot get it to build.

Are there simple instructions to install OpenSSL on WSL?