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spritz.py
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spritz.py
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import math
from fractions import gcd
class Spritz():
alt = False
def initialize_state(self, N_input):
self.i = 0
self.j = 0
self.k = 0
self.z = 0
self.a = 0
self.w = 1
self.N = N_input
self.D = int(math.ceil(math.sqrt(self.N)))
self.S = range(self.N)
def low(self, b):
return b % self.D
def high(self, b):
return int(math.floor(b/self.D))
def update(self):
self.i = (self.i + self.w) % self.N
self.j = (self.k + self.S[(self.j + self.S[self.i]) % self.N]) % self.N
self.k = (self.i + self.k + self.S[self.j]) % self.N
self.S[self.i], self.S[self.j] = self.S[self.j], self.S[self.i]
def whip(self, r):
for v in range(r):
self.update()
self.w = (self.w + 1) % self.N
while gcd(self.w, self.N) != 1:
self.w = (self.w + 1) % self.N
def crush(self):
for v in range(int(math.floor(self.N/2))):
if self.S[v] > self.S[self.N-1-v]:
self.S[v], self.S[self.N-1-v] = self.S[self.N-1-v], self.S[v]
def alt_crush(self):
for v in range(int(math.floor(self.N/2))):
x = self.S[v]
y = self.S[N-1-v]
if x > y:
self.S[v] = y
self.S[N-1-v] = x
else:
self.S[v] = x
self.S[N-1-v] = y
def shuffle(self):
self.whip(2*self.N)
self.alt_crush() if self.alt else self.crush()
self.whip(2*self.N)
self.alt_crush() if self.alt else self.crush()
self.whip(2*self.N)
self.a = 0
def absorb_nibble(self, x):
if self.a == int(math.floor(self.N/2)):
self.shuffle()
self.S[self.a], self.S[int(math.floor(self.N/2)+x)] = self.S[int(math.floor(self.N/2)+x)], self.S[self.a]
self.a = (self.a + 1) % self.N
def absorb_byte(self, b):
self.absorb_nibble(self.low(b))
self.absorb_nibble(self.high(b))
def absorb(self, I):
for v in range(0, len(I), 3):
byte = int(I[v:v+3])
self.absorb_byte(byte)
def absorb_stop(self):
if self.a == int(math.floor(self.N/2)):
self.shuffle()
self.a = (self.a + 1) % self.N
def output(self):
self.z = self.S[(self.j + self.S[(self.i + self.S[(self.z + self.k) % self.N]) % self.N]) % self.N]
return self.z
def drip(self):
if self.a > 0:
self.shuffle()
self.update()
return self.output()
def squeeze(self, r):
if self.a > 0:
self.shuffle()
P = ""
for v in range(r):
#P.append("%0.2X" % self.drip())
P += "%03d" % self.drip()
return P
def print_variables(self):
print "i: " + hex(self.i)
print "j: " + hex(self.j)
print "k: " + hex(self.k)
print "z: " + hex(self.z)
print "a: " + hex(self.a)
print "w: " + hex(self.w)
print "D: " + hex(self.D)
print "S: " + self.array_to_string(self.S)
#print "S: " + str(self.S)
def int_string(self, string):
key = ""
for char in string:
key += "%03d" % ord(char)
return key
def int_to_hex(self, int_string):
result = ""
for i in range(0, len(int_string), 3):
result += "%0.2X" % int(int_string[i:i+3])
return result
def array_to_string(self, array):
result = ""
for i in array:
result += "%0.2X" % i
return result
def hash(self, N, M, r):
self.initialize_state(N)
self.absorb(M)
self.absorb_stop()
self.absorb_byte(r)
return self.squeeze(r)
def key_setup(self, K):
self.initialize_state(256)
self.absorb(K)
def encrypt(self, K, M):
self.key_setup(K)
Z_string = self.squeeze(len(M))
Z = [int(Z_string[i:i+3]) for i in range(0, len(Z_string), 3)]
C = [i + j for i, j in zip(M, Z)]
return C