comp_sci_kid

Even if you have a firm offer in hand, your current managers would only denigrate you. So it's not clear what the new firm is looking for.

Perhaps they just want confirmation of employment -- that's fair. In that case you disclose your HR department, not your line manager.

BTW, you should learn the difference between referral and reference.

Since you've only have one job, the typical reference population is former colleagues (who left your current firm).