Section GHMAC_PRF.
Variable c p : nat.
Definition b := @b c p.
Variable h : Bvector c -> Bvector b -> Bvector c.
Variable iv : Bvector c.
Variable fpad : Bvector c -> Bvector p.
Variable opad ipad : Bvector b.
Hypothesis opad_ne_ipad : opad <> ipad.
Definition GHMAC := GHMAC h iv fpad opad ipad.
Variable A : OracleComp (list (Bvector b)) (Bvector c) bool.
Hypothesis A_wf : well_formed_oc A.

Theorem GHMAC_PRF :
PRF_Advantage (Rnd b) (Rnd c) GHMAC _ _ A <=
RKA_Advantage _ _ _  ({ 0 , 1 }^b) ({ 0 , 1 }^c)
(dual_f h) (BVxor b) (HMAC_RKA_A h iv fpad opad ipad A) +
(PRF_Advantage ({ 0 , 1 }^c) ({ 0 , 1 }^c) h _ _
(PRF_h_A (h_star_pad h fpad) A) +
cAU.Adv_WCR _ _
(h_star_pad h fpad) ({ 0 , 1 }^c)
(au_F_A A)).