If they where generated using crypt, why not tell dovecot to use crypt also?
Quoting KT Walrus <kevin at my.walr.us>:
> I?m using the Dovecot Enterprise Edition on Centos 6.5, but Blowfish
> password hashes don?t seem to work. What can I do to enable
> Blowfish hashes for passwords? Maybe I don?t have my installation
> configured properly?
>
> Note that I really want to use the existing Blowfish hashes in my
> MySQL database for Dovecot Authentication. The hashes are generated
> by PHP crypt() that has Blowfish support built-in. I looked at
> PHP?s sources, and PHP uses crypt_blowfish.c from
> openwall.com/crypt. This code is in the public domain
> and could easily be used by Dovecot to support Blowfish passwords on
> all platforms (if Dovecot doesn?t already support Blowfish on all
> platforms).
>
> Kevin