346 lines
8.3 KiB
Python
Executable File
346 lines
8.3 KiB
Python
Executable File
#!/usr/bin/python
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#
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# Generate Multi-party NSL protocol description for n parties
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#
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# Input: P variant
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#
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# variant uses some bits:
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# bit mask meaning if set to '1'
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# (message type 1)
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# 0 1 nonces in reverse
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# 1 2 nonces after agents
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# 2 4 agents in reverse
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# 3 8 interleaved variant
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# (message type 2)
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# 4 16 nonces in reverse in message 2
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#
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# Convention similar to e.g. Prolog: capitals indicate open variables;
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# in particular, they can be bound by _any_ value during the run,
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# assuming full type flaws.
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#
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import sys
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from optparse import OptionParser
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def parseArgs():
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usage = "usage: %s [opts] Parties Variant" % sys.argv[0]
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parser = OptionParser(usage=usage)
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parser.add_option('-p','--protocol', dest='protocol',
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help='Generate another protocol [nsl,bke]', default="nsl",
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action='store')
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(opts, args) = parser.parse_args()
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if len(args) != 2:
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parser.print_help()
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sys.exit(0)
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if opts.protocol not in ["nsl","bke","nsl-priv-noprop","nsl-pub-nap","bke-nap"]:
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print "I don't know the %s protocol." % (opts.protocol)
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sys.exit(0)
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return (opts,args)
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def variablerole (r, inrole):
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if r == inrole or inrole == 0:
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return False
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else:
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return True
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def role (r,inrole):
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global P
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return "r%i" % (r % P)
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def zeroconst ():
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""" This is 0 or some other stupid constant """
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return "zeroconst"
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def nonce (r,inrole):
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global P
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if r == inrole:
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# nonce of our own
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return "n%i" % (r % P)
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else:
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# a variable: we want to see this in the notation
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return "N%i" % (r % P)
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def extend (s1, s2):
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if s1 == "":
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return s2
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else:
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return s1 + "," + s2
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def weavel (l1,l2,reverse1,swap,reverse2,interleave):
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""" l1 is typically a list of nonces, l2 might be empty (names) """
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global variant
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if reverse1:
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l1.reverse()
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if l2 == []:
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return l1
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else:
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if reverse2:
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l2.reverse()
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if swap:
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# swap
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l3 = l1
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l1 = l2
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l2 = l3
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if interleave:
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rl = []
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largest = max(len(l1),len(l2))
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for i in range (0,largest):
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if i < len(l1):
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rl.append(l1[i])
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if i < len(l2):
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rl.append(l2[i])
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return rl
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else:
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return l1 + l2
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def message1 (label,inrole):
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global P,variant,opts
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if opts.protocol in ['bke','nsl']:
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noncelist = []
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for i in range(0,label+1):
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noncelist.append(nonce(i,inrole))
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rolelist = []
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for i in range(0,P):
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if i != (label+1) % P:
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rolelist.append(role(i,inrole))
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return ",".join(weavel(noncelist,rolelist,
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(variant & 1 != 0),
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(variant & 2 != 0),
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(variant & 4 != 0),
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(variant & 8 != 0)
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))
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elif opts.protocol == 'nsl-priv-noprop':
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list = []
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for i in range(0,P):
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list.append(role(i,inrole))
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list.append(nonce(0,inrole))
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msg = ",".join(list)
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for i in range(1,label+1):
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msg = "{ %s,%s }sk(%s)" % (msg,nonce(i,inrole),role(i,inrole))
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return msg
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elif opts.protocol == 'nsl-pub-nap':
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list = []
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for i in range(0,P):
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list.append(role(i,inrole))
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list.append(nonce(0,inrole))
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msg = ",".join(list)
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for i in range(1,label+1):
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msg = "{ %s }sk(%s), %s" % (msg,role(i,inrole),nonce(i,inrole))
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msg = "{ %s }pk(%s)" % (msg,role(label+1,inrole))
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return msg
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elif opts.protocol == 'bke-nap':
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list = []
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for i in range(0,P):
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list.append(role(i,inrole))
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list.append(nonce(0,inrole))
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msg = ",".join(list)
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for i in range(1,label+1):
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msg = "{ %s }sk(%s), %s" % (msg,role(i,inrole),nonce(i,inrole))
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msg = "{ %s }pk(%s)" % (msg,role(label+1,inrole))
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return msg
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else:
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print "Hmm, I don't know how to create the first message for protocol %s" % (opts.protocol)
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def message2 (label,inrole):
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global P,variant,opts
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if opts.protocol == "nsl":
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noncelist = []
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for i in range (((label + 1) % P),P):
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noncelist.append(nonce(i,inrole))
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return ",".join(weavel(noncelist,[],
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(variant & 16 != 0),
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False,
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False,
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False
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))
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elif opts.protocol == "bke":
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noncelist = []
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for i in range (((label + 1) % P) + 1,P):
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noncelist.append(nonce(i,inrole))
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if len(noncelist) == 0:
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noncelist.append(zeroconst())
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return ",".join(weavel(noncelist,[],
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(variant & 16 != 0),
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False,
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False,
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False
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))
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elif opts.protocol in ['nsl-priv-noprop','nsl-pub-nap']:
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msg = message1(P-1,inrole)
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for i in range(0,label-P+1):
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msg = "{ %s }sk(%s)" % (msg,role(i,inrole))
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if opts.protocol == 'nsl-pub-nap':
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msg = "{ %s }pk(%s)" % (msg,role(label+1,inrole))
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return msg
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elif opts.protocol == 'bke-nap':
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msg = message1(P-1,inrole)
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for i in range(0,label-P+1):
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msg = "{ %s }sk(%s)" % (msg,role(i,inrole))
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msg = "{ %s }%s" % (msg,nonce((label+1) % P,inrole))
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return msg
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else:
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print "Hmm, I don't know how to create the final message for protocol %s" % (opts.protocol)
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def message (label,inrole):
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global P,opts
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if opts.protocol in ['bke','nsl']:
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s = "{ "
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if label < P:
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s = s + message1 (label,inrole)
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else:
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s = s + message2 (label,inrole)
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if opts.protocol == "bke" and not (label < P):
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s = s + " }" + nonce((label+1) % P, inrole)
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else:
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s = s + " }pk(%s)" % role(label+1,inrole)
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return s
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else:
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if label < P:
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return message1 (label,inrole)
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else:
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return message2 (label,inrole)
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def action (event,label,inrole):
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s = "\t\t%s_%i(%s,%s, " % (event,label, role(label,inrole),
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role(label+1,inrole))
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s += message (label,inrole)
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s += " );\n"
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return s
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def recv (label,inrole):
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return action ("recv", label,inrole)
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def send (label,inrole):
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return action ("send", label,inrole)
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def roledef (r):
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global P,opts
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s = ""
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s += "\trole " + role(r,r) + "\n\t{\n"
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# constants for this role
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s += "\t\tconst " + nonce (r,r) + ": Nonce;\n"
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# variables
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s += "\t\tvar "
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nr = 0
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for i in range (0,P):
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if r != i:
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if nr > 0:
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s += ","
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s += nonce(i,r)
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nr += 1
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s += ": Nonce;\n"
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# implicit role variables
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rolevars = []
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for i in range (0,P):
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if variablerole(i,r):
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rolevars.append(role(i,r))
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if rolevars != []:
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s += "\t\t// Implicit role variables: "
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s += ",".join(rolevars)
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s += ": Role;\n"
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# actions
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s += "\n"
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if r > 0:
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# Initial recv
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s += recv(r-1,r)
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s += send(r,r)
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s += recv(P+r-1,r)
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if r < (P-1):
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# Final send
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s += send(P+r,r)
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# claims
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if opts.protocol in ['bke','nsl','nsl-pub-nap','bke-nap']:
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s += "\t\tclaim_%sa( %s, Secret, %s );\n" % (role(r,r), role(r,r),
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nonce(r,r))
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s += "\t\tclaim_%sb( %s, Nisynch );\n" % (role(r,r), role(r,r))
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# close
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s += "\t}\n\n"
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return s
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def protocol (args):
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global P,variant,opts
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P = int(args[0])
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variant = int(args[1])
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s = ""
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s += "// Generalized %s protocol for %i parties\n\n" % (opts.protocol,P)
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s += "// " + str(opts) + "\n\n"
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s += "// Variant %i\n" % variant
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if opts.protocol == "bke":
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s += "usertype Globalconstant;\n"
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s += "const %s: Globalconstant;\n" % (zeroconst())
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s += "\n"
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s += "protocol mnsl%iv%i(" % (P,variant)
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for i in range (0,P):
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if i > 0:
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s += ","
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s += role(i,i)
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s += ")\n{\n"
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for i in range (0,P):
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s += roledef(i)
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s += "}\n\n"
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s += "\n"
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return s
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def main():
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global opts
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(opts,args) = parseArgs()
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print protocol(args)
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# Only if main stuff
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if __name__ == '__main__':
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main()
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