Hi !
I am one of the Debian developper releasing the Vagrant base boxes 
available in as debian/stretch64 on app.vagrantup.com

One user recently reported to us that when using the `vagrant add` command, 
any madeup checksum given with `--checksum` would be considered as valid.

Looking at the fine manual at 
https://www.vagrantup.com/docs/cli/box.html#options-for-direct-box-files

```
Checksums for versioned boxes or boxes from HashiCorp's Vagrant Cloud: For 
boxes from HashiCorp's Vagrant Cloud, the checksums are embedded in the 
metadata of the box. The metadata itself is served over TLS and its format 
is validated.
```

I see two issues :

 * shouldn't the `vagrant add` command fails when `--checksum` is used and 
the box is added from VagrantCloud ? 

 * generally, how could we (Vagrant box maintainers) generate a checksum as 
and have it verified when downloading a box ?
I know it's possible to grok the link from `vagrant add`, download the box 
with curl,
and add the box locally, but it kinds of defeats the purpose of having a 
central registry (versioning, etc ...)
This kind of checksumming is important because I am signing the checksums 
with a GPG key available in the Debian keyring, building a direct trust 
link with end users.

Debian is not the only one having a problem here, I talked to the 
maintainer of the Centos Vagrant boxes, and Centos Boxes have exactly the 
same issue: if you follow the instructions from 
https://seven.centos.org/2017/10/updated-centos-vagrant-images-available-v1710-01/
 
and replace the checksum with `1234`, `vagrant add` will add the box 
without any error.

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