84 lines
2.0 KiB
C++
84 lines
2.0 KiB
C++
/** HEADDOC
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* @protocol Just Fast Keying
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* @reference Aiello et al., Just Fast Keying: Key Agreement In A Hostile
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* Internet
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* @description
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* @variant Initiatior is identity protected
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**/
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/** MACRO DEFINITIONS
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* Needs preprocessing by cpp before fed to scyther
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**/
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#define __JFK__
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#ifndef __ORACLE__
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#include "common.h"
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#endif
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/**
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* This role serves as an "oracle" to ensure the executability of the
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* protocol by taking care of the problems that arise from our way of
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* modelling Diffie-Hellman keys.
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*/
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protocol @executability(O) {
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#define Gi g(i)
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#define Gr g(r)
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role O {
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var i, r, Ni, Nr, SAi, SAr: Nonce;
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var I, R: Agent;
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// msg 3
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recv_!O1( O, O, {I, SAi, {H(Ni), Nr, g(i), Gr, R, SAi}sk(I)}SKi );
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send_!O2( O, O, {I, SAi, {H(Ni), Nr, g(i), Gr, R, SAi}sk(I)}SKr );
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// msg 4
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recv_!O3( O, O, {{H(Ni), Nr, g(i), Gr, I, SAi, SAr}sk(R), SAr}SKr );
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send_!O4( O, O, {{H(Ni), Nr, g(i), Gr, I, SAi, SAr}sk(R), SAr}SKi );
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}
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#undef Gi
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#undef Gr
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}
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// Abstractions: no grpinfo, no MAC(ENC(M)), no ID_R', no IPi
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protocol jfki(I, R)
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{
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role I {
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fresh i, Ni, SAi: Nonce;
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var Nr, SAr: Nonce;
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var Gr, TH: Ticket;
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send_1( I, R, H(Ni), g(i) );
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recv_2( R, I, H(Ni), Nr, Gr, R, {Gr}sk(R), TH );
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send_!3( I, R, Ni, Nr, g(i), Gr, TH, {I, SAi, {H(Ni), Nr, g(i), Gr, R, SAi}sk(I)}SKi );
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recv_!4( R, I, {{H(Ni), Nr, g(i), Gr, I, SAi, SAr}sk(R), SAr}SKi );
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/* SECURITY CLAIMS */
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claim( I, SKR, SKi );
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claim( I, Alive );
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claim( I, Weakagree );
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}
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role R {
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fresh r, Nr, SAr, HKr: Nonce;
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var Ni, SAi: Nonce;
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var Gi, HNi: Ticket;
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recv_1( I, R, HNi, Gi );
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send_2( R, I, HNi, Nr, g(r), R, {g(r)}sk(R), H(HKr, g(r), Nr, HNi) );
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// Note: if R can receive H(HKr, g(r), Nr, H(Ni)) then HNi=H(Ni)
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recv_!3( I, R, Ni, Nr, Gi, g(r), H(HKr, g(r), Nr, H(Ni)), {I, SAi, {H(Ni), Nr, Gi, g(r), R, SAi}sk(I)}SKr );
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send_!4( R, I, {{H(Ni), Nr, Gi, g(r), I, SAi, SAr}sk(R), SAr}SKr );
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/* SECURITY CLAIMS */
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claim( R, Secret, HKr );
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claim( R, SKR, SKr );
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claim( R, Alive );
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claim( R, Weakagree );
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}
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} |