def getResults(self, key, rounds, data, array):
"""
Iterate through many random permutations of
masking and conduct DES for certain number of rounds
Adds to list of results if similar.
"""
counter_without_result = 0
results = {}
while True:
if counter_without_result > 2**17:
break
curr_len = len(results)
num1, num2 = self._get_xor_hex(array, results)
hex_value = num1 + num2
new_data = self.bitwise_xor(data, hex_value)
des_ = DES(key, new_data, self.rounds, self.mode)
new_rounds = des_._encrypt()
results = self.check_similarity(results, rounds, new_rounds,
hex_value)
if len(results) > curr_len:
counter_without_result = 0
else:
counter_without_result += 1
return results
def main(self):
permutations = 2**25
array = []
for i in range(permutations):
if str(bin(i)).count('1') < 4:
array.append(i)
print(array[:10])
num_results = 0
while True:
key, data = self.generate()
des = DES(key, data, self.rounds, self.mode)
rounds = des._encrypt()
results = self.getResults(key, rounds, data, array)
sim_results = self.getXORSimiarlity(results)
if len(sim_results) != 0:
with open("S5DESTriples" + data, 'a') \
as file_out:
for i in range(len(sim_results)):
if i % 2 == 0:
num_results += 1
print("S5DES:" + str(num_results))
initial_ = key + "\t" + self.mode + '\t' \
+ data[:8] + '\t' + data[8:] + '\t'
line_w_tabs = "\t".join(rounds) + '\n'
file_out.write(initial_)
file_out.write(line_w_tabs)
initial_ = key + "\t" + self.mode + '\t' \
+ sim_results[i][0][:8] + '\t'\
+ sim_results[i][0][8:] + '\t'
line_w_tabs = "\t".join(sim_results[i][1]) + '\n'
file_out.write(initial_)
file_out.write(line_w_tabs)
end_time = time.time()
self.timearray.append(end_time - self.start)
