Ability to import crypt(3) hashes

[indietyp]

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Describe your problem

We're currently using md5-crypt (from the libcrypt ) to hash passwords (it is part of the POSIX C library), which are currently not supported by Kratos.

Adding support for them would be very beneficial, as many systems, especially older ones that seek to move Kratos, use crypt(3) functions for their hashes.

Describe your ideal solution

Ability to ideally import any crypt(3) hash, but at least have the ability to import md5crypt hashes.

Workarounds or alternatives

There are currently no workarounds, as the algorithms for md5crypt based hashes is not compatible with the md5 import (it uses md5 internally).

Version

v0.13.0

Additional Context

Having looked around the go ecosystem, it seems that there are quite a lot existing libraries that support crypt(3) hashes.

[aeneasr]

Sounds good, please use the PHC hashing format for this