def harakatruncated(config):
"""
Find best attack in our truncated model for Haraka.
"""
num_states = ((config["aesrounds"] + 1) * config["rounds"]) + 1
# Iterate over all possible starting states for the attack
best_attack = 999999
best_round = -1
best_model = 0
for rnd in range(num_states - 1):
if haraka.isAESround(rnd, config["aesrounds"]):
config["attackerstart"] = rnd
model = haraka.buildmodel(config)
attack_costs = round(solvemodel(model).objVal)
print("Subround {} - Best Attack: {}".format(rnd, attack_costs))
if attack_costs < best_attack:
best_attack = attack_costs
best_round = rnd
best_model = model
print("Found best attack in round {} with costs {}".format(best_round,
best_attack))
haraka.printmodel(best_model, config)
return
def findminactivesbox(config):
"""
Example which finds the minimum number of active S-boxes for AES like
ciphers, with the parameters given in the config file.
"""
if config["name"] == "aeslike":
model = aeslike.buildmodel(config)
solved_model = solvemodel(model)
aeslike.printmodel(solved_model, config)
elif config["name"] == "haraka":
model = haraka.buildmodel(config)
solved_model = solvemodel(model)
haraka.printmodel(solved_model, config)
return
def activesboxharaka():
config = {"rounds": 1,
"wordsize": 8,
"branchnumber": 5,
"statedimension": 4,
"aesstates": 4,
"aesrounds": 2,
"collisiononly": False,
"mixlayer": "mix",
"securitymodel": "sbox"}
print("Rounds", "S-boxes", sep="\t")
for num_rounds in range(1, 8):
print(num_rounds, end='')
for aes_rounds in range(1, 6):
config["rounds"] = num_rounds
config["aesrounds"] = aes_rounds
solved_model = solvemodel(haraka.buildmodel(config))
print(" ", round(solved_model.ObjVal), end="")
print("")
def activesboxharaka():
config = {
"rounds": 1,
"wordsize": 8,
"branchnumber": 5,
"statedimension": 4,
"aesstates": 4,
"aesrounds": 2,
"collisiononly": False,
"mixlayer": "mix",
"securitymodel": "sbox"
}
print("Rounds", "S-boxes", sep="\t")
for num_rounds in range(1, 8):
print(num_rounds, end='')
for aes_rounds in range(1, 6):
config["rounds"] = num_rounds
config["aesrounds"] = aes_rounds
solved_model = solvemodel(haraka.buildmodel(config))
print(" ", round(solved_model.ObjVal), end="")
print("")