105 lines
2.1 KiB
Python
105 lines
2.1 KiB
Python
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#!/usr/bin/python
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"""
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Scyther : An automatic verifier for security protocols.
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Copyright (C) 2007 Cas Cremers
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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"""
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import sys
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def nlist(pref,post,si,ei):
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s = ""
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for x in range(si,ei+1):
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if s != "":
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s += ","
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s += "%s%i" % (pref,x)
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s += post
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return s
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def ffgg(n):
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s = """
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/*
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* ffgg%i protocol
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*/
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// PKI infrastructure
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const pk: Function;
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secret sk: Function;
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inversekeys (pk,sk);
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// The protocol description
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protocol ffgg%i(A,B)
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{
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role A
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{
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""" % (n,n)
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nonces1 = nlist("n","",1,n)
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nonces1b = nlist("n","",2,n)
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nonces2 = nlist("n","b",2,n)
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ivar = nonces1
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rvar = nonces2
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rconst = nonces1
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s += """
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const M: Nonce;
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var %s: Nonce;
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send_1(A,B, A );
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read_2(B,A, B,%s );
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send_3(A,B, A,{%s,M}pk(B) );
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read_4(B,A, n1,n2,{%s,M,n1}pk(B) );
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claim_i1(A,Secret,M);
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}
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role B
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{
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var M,%s: Nonce;
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const %s: Nonce;
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read_1(A,B, A );
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send_2(B,A, B,%s );
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read_3(A,B, A,{n1,%s,M}pk(B) );
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send_4(B,A, n1,n2b,{%s,M,n1}pk(B) );
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}
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}
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// The agents in the system
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const Alice,Bob: Agent;
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// An untrusted agent, with leaked information
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const Eve: Agent;
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untrusted Eve;
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const ne: Nonce;
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compromised sk(Eve);
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""" % (ivar,nonces1,nonces1,nonces1b,rvar,rconst,nonces1,nonces2,nonces2)
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return s
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if __name__ == '__main__':
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if len(sys.argv) > 1:
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print ffgg(int(sys.argv[1]))
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else:
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print "Please provide a number n to generate ffgg_n"
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