dovecot - Sep 2010 - MD5 to CRAM-MD5 password conversion?

We have a plethora of accounts for which we would like to enable
CRAM-MD5 but their passwords are stored as MD5 hashes. Is there anything
we can do? Can we take a linux MD5 hashed password (e.g.
$1$fac330ee$wd6Tll...) and convert it to dovecot's CRAM-MD5 format (e.g.
{CRAM-MD5}b3f297...)?

Thanks!

On Tue, 2010-09-21 at 11:24 -0700, David Jonas wrote:
> We have a plethora of accounts for which we would like to enable
> CRAM-MD5 but their passwords are stored as MD5 hashes. Is there anything
> we can do? Can we take a linux MD5 hashed password (e.g.
> $1$fac330ee$wd6Tll...) and convert it to dovecot's CRAM-MD5 format
(e.g.
> {CRAM-MD5}b3f297...)?
a) Crack the password with brute force. Probably won't be highly
successful.

b) The plaintext password is known while user logs in. Save it as
CRAM-MD5 at that time.