add cryptographicallySecure

Note that GPGHMAC keys are not cryptographically secure, because their
content has no relation to the name of the key. So, things that use this
function to avoid sending keys to a remote will need to special case in
support for those keys. If GPGHMAC keys were accepted as
cryptographically secure, symlinks using them could be committed to a
git repo, and their content would be accepted into the repo, with no
guarantee that two repos got the same content, which is what we're aiming
to prevent.

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