def process_sig(self, chip_name, sig):
"""This computes and records some greedy statistics on a given signature"""
# add this chip if it is unknown
if chip_name not in self.signatureMap.keys():
self.add(chip_name, sig)
else:
# update unstable bit map
if chip_name not in self.unstableBits:
self.unstableBits[chip_name] = BitStream(uint=0,
length=self.nb)
if self.measCount[chip_name] > 0:
self.unstableBits[chip_name] = self.unstableBits[chip_name] | (
self.signatureMap[chip_name] ^ sig)
# Increment the measurement count for this chip
self.measCount[chip_name] += 1
# record 1 noise distance
if chip_name not in self.noiseDistMap.keys():
self.noiseDistMap[chip_name] = []
else:
# assume that if we didn't have a list, that this is the first measurement,
# and therefore we need to wait for a subsequent one before we can compute a noise distance
self.noiseDistMap[chip_name].append(
bitstringutils.hd(sig, self.signatureMap[chip_name]))
# for scalability, should truncate this list
if len(self.noiseDistMap[chip_name]) > self.max_num_dists:
self.noiseDistMap[chip_name] = self.noiseDistMap[chip_name][
-self.max_num_dists:]
# and record (N_C - 1) inter-chip distances
for other_chip_name in self.signatureMap.keys():
if other_chip_name == chip_name:
# don't compare to self
continue
if chip_name not in self.interChipDistMap.keys():
self.interChipDistMap[chip_name] = dict()
if other_chip_name not in self.interChipDistMap[chip_name].keys():
self.interChipDistMap[chip_name][other_chip_name] = []
self.interChipDistMap[chip_name][other_chip_name].append(
bitstringutils.hd(sig, self.signatureMap[other_chip_name]))
# for scalability, I truncate this list
if len(self.interChipDistMap[chip_name]
[other_chip_name]) > self.max_num_dists:
self.interChipDistMap[chip_name][
other_chip_name] = self.interChipDistMap[chip_name][
other_chip_name][-self.max_num_dists:]
def MatchMap(self, bits):
"This compares a bit string against all known chip signatures"
hd_dict = dict()
for key, value in self.signatureMap.items():
relhd = float(bitstringutils.hd(bits, value)) / self.nb
hd_dict[key] = relhd
return hd_dict
def MatchMap(self, bits):
"This compares a bit string against all known chip signatures"
hd_dict = dict()
for key, value in self.signatureMap.items():
relhd = float(bitstringutils.hd(bits, value))/self.nb
hd_dict[key] = relhd
return hd_dict
def process_sig (self, chip_name, sig):
"""This computes and records some greedy statistics on a given signature"""
# add this chip if it is unknown
if chip_name not in self.signatureMap.keys():
self.add(chip_name, sig)
else:
# update unstable bit map
if chip_name not in self.unstableBits:
self.unstableBits[chip_name] = BitStream(uint=0, length=self.nb)
if self.measCount[chip_name] > 0:
self.unstableBits[chip_name] = self.unstableBits[chip_name] | (self.signatureMap[chip_name] ^ sig)
# Increment the measurement count for this chip
self.measCount[chip_name] += 1
# record 1 noise distance
if chip_name not in self.noiseDistMap.keys():
self.noiseDistMap[chip_name] = []
else:
# assume that if we didn't have a list, that this is the first measurement,
# and therefore we need to wait for a subsequent one before we can compute a noise distance
self.noiseDistMap[chip_name].append(bitstringutils.hd(sig, self.signatureMap[chip_name]))
# for scalability, should truncate this list
if len(self.noiseDistMap[chip_name]) > self.max_num_dists:
self.noiseDistMap[chip_name] = self.noiseDistMap[chip_name][-self.max_num_dists:]
# and record (N_C - 1) inter-chip distances
for other_chip_name in self.signatureMap.keys():
if other_chip_name == chip_name:
# don't compare to self
continue
if chip_name not in self.interChipDistMap.keys():
self.interChipDistMap[chip_name] = dict()
if other_chip_name not in self.interChipDistMap[chip_name].keys():
self.interChipDistMap[chip_name][other_chip_name] = []
self.interChipDistMap[chip_name][other_chip_name].append(
bitstringutils.hd(sig, self.signatureMap[other_chip_name]))
# for scalability, I truncate this list
if len(self.interChipDistMap[chip_name][other_chip_name]) > self.max_num_dists:
self.interChipDistMap[chip_name][other_chip_name] = self.interChipDistMap[chip_name][other_chip_name][-self.max_num_dists:]