def Encrypt(bytes:list, seed, steps:int):
global seedlen, debug
assert len(seed) > 20
CA.r_initCA(seed, steps) #Start up the CA with the specified seed and steps
m_data = bytes[:]
m_head = 0
ca_m_head = 4
ca_enc_head = len(seed) // 2 - 4
d = dlast = []
while (CA.steps <= 0):
dlast = d
d = CA.update()
if (d[ca_m_head] == 1):
m_head += 1
if (m_head >= len(m_data)):
m_head = 0
else:
pass #don't move m_head
b = "0b"
r = d.range()
for i in range(r[0] + ca_enc_head, r[0] + ca_enc_head + 8):
b += str(d[i])
m_data[m_head] = m_data[m_head] ^ int(b, 2)
DumpCurrentRow(CA.steps, m_head, m_data, ca_m_head, d, b)
#debug.write("\n\n\n")
return m_data
def Decrypt(bytes:list, seed, steps:int):
assert len(seed) > 20
CA.r_initCA(seed, steps) #Start up the CA with the specified seed and steps
m_data = bytes[:]
m_head = 0
ca_m_head = 4
ca_enc_head = len(seed) // 2 - 4
d = dlast = []
while (CA.steps <= 0):
dlast = d
d = CA.update()
if (d[ca_m_head] == 1):
m_head += 1
if (m_head >= len(m_data)):
m_head = 0
else:
pass #don't move m_head
debug.write("mhead: " + str(m_head) + "\tdelta mhead: " + str(d[ca_m_head]) + "\n")
#debug.write("\n\n\n")
CA.rows = [d, dlast]
CA.steps = -steps
#CA.init() # starts the pygame window
##Todo: refactor these two runs into the below code to maximize reuse
for n in (d, dlast):
dH = 0
#CA.update_screen(d) # updates the pygame window
if (n[ca_m_head] == 1):
dH = -1
if (m_head < 0):
m_head = len(m_data) - 1
else:
dH = 0
b = "0b"
r = n.range()
for i in range(r[0] + ca_enc_head, r[0] + ca_enc_head + 8):
b += str(n[i])
m_data[m_head] = m_data[m_head] ^ int(b, 2)
m_head += dH
#debug.write("d\t")
DumpCurrentRow(CA.steps, m_head, m_data, ca_m_head, d, b)
while (CA.steps <= -2):
dH = 0
d = CA.update()
#CA.update_screen(d) # updates the pygame window
if (d[ca_m_head] == 1):
dH = -1
if (m_head < 0):
m_head = len(m_data) - 1
else:
dH = 0
b = "0b"
r = d.range()
for i in range(r[0] + ca_enc_head, r[0] + ca_enc_head + 8):
b += str(d[i])
m_data[m_head] = m_data[m_head] ^ int(b, 2)
m_head += dH
DumpCurrentRow(CA.steps, m_head, m_data, ca_m_head, d, b)
#debug.close()
return m_data
