Hmm, unfortunately I think Symfony2 runs passwords through 1 round of SHA1 unless a custom password "encoder" is used [1].
[1] = http://symfony.com/doc/2.0/book/security.html#encoding-the-u...
[1] = http://symfony.com/doc/2.0/book/security.html#encoding-the-u...
http://symfony.com/doc/current/reference/configuration/secur...