(*************************************************************
 *                                                           *
 *  Cryptographic protocol verifier                          *
 *                                                           *
 *  Bruno Blanchet, Vincent Cheval, and Marc Sylvestre       *
 *                                                           *
 *  Copyright (C) INRIA, CNRS 2000-2020                      *
 *                                                           *
 *************************************************************)

(*

    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details (in file LICENSE).

    You should have received a copy of the GNU General Public License
    along with this program; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

*)
pred c/1 elimVar,decompData.
nounif c:x.

fun pk/1.
fun encrypt/2.

fun sign/2.

query c:secret[].

reduc
(* Initialization *)

c:c[];
c:pk(sA[]);
c:pk(sB[]);

(* The attacker *)

c:x & c:encrypt(m,pk(x)) -> c:m;
c:x -> c:pk(x);
c:x & c:y -> c:encrypt(x,y);
c:sign(x,y) -> c:x;
c:x & c:y -> c:sign(x,y);

(* The protocol *)
(* A *)

c:pk(x) -> c:encrypt(sign((pk(sA[]), pk(x), k[pk(x)]), sA[]), pk(x));

(* B *)

c:encrypt(sign((pk(sA[]), pk(sB[]), k), sA[]), pk(sB[])) -> c:encrypt(secret[], pk(k)).
