Subject: RC4-hmac and PRF

From: Sam Hartman <[email-masked]>
Date: Tue, 07 Dec 2004 08:31:44 -0500

Hi.  I find myself working on some application protocols for which we
are making heavy use of the krb5 PRF.  Currently we are not going to
end up supporting rc4-hmac.  The main reason is that its current spec
does not have a kcrypto PRF.

I think our users would like to be able to use RC4 with the
application in question (AFS).

If you get a chance to think about how you would do the kcrypto PRF
for RC4 it would be appreciated.

Presumably you would end up with 128-bits of output from the PRF for
each call.  

--Sam