Migrate passwords from shadow to mysql

[Shelley Waltz]

I am installing a new postfix-cyrus mail server.
I currently have cyrus-imap 1.6.24 authing PLAIN
from /etc/shadow.

I wish to migrate the passwords(md5) from the shadow file to
a mysql database and use this to auth PLAIN using TLS.
Is there a script available to do so - to migrate the users
from the shadow file and create the records for mysql authentication?

I did search, but found nothing.

thanks
Shelley