The LDAP-formatted passwords using
[Crypt encoding](https://en.wikipedia.org/wiki/Crypt_(C))
can be hashed in many ways, inlcuding the old and deprecated DES and
BSDi methods.
The usual formatting for Crypt method consists in
$method$salt$pass_hash
but those two deprecated methods are not encoded this way, and
`get_salt` would fail on those, yielding Error 500.
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