Please help this newbie

[heather]

In other words, it sounds like your hashmode is unsupported by hashcat and a plugin or module would need to be built for it.

As reminder, I have not even figured out how to incorporate the initialization vector into the hash.  Before determining it's "unsupported", wouldn't I need to do that first and then convert to base64?.  I'm so lost.  Can you tell me why you believe it's unsupported?