78 lines
1.6 KiB
C++
78 lines
1.6 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 Core cryptographic protocol of JFKr
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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_CORE__
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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: Nonce;
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var I, R: Agent;
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// msg 3
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recv_!O1( O, O, H(SKr, Nr, Ni, R) );
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send_!O2( O, O, H(SKi, Nr, Ni, R) );
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// msg 4
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recv_!O3( O, O, H(SKi, Nr, Ni, I) );
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send_!O4( O, O, H(SKr, Nr, Ni, I) );
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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: same key for ENC, MAC
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protocol jfkr-core(I, R)
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{
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role I {
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fresh i, Ni: Nonce;
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var Nr, Gr: Ticket;
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send_1( I, R, Ni, g(i) );
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recv_!2( R, I, Nr, Ni, R, Gr, {Nr, Ni, Gr, g(i)}sk(R), H(SKi, Nr, Ni, R) );
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send_!3( I, R, Nr, Ni, I, {Nr, Ni, Gr, g(i)}sk(I), H(SKi, Nr, Ni, I) );
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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: Nonce;
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var Ni, Gi: Ticket;
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recv_1( I, R, Ni, Gi );
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send_!2( R, I, Nr, Ni, R, g(r), {Nr, Ni, g(r), Gi}sk(R), H(SKr, Nr, Ni, R) );
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recv_!3( I, R, Nr, Ni, I, {Nr, Ni, g(r), Gi}sk(I), H(SKr, Nr, Ni, I) );
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/* SECURITY CLAIMS */
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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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} |