def readNBytesAsBits(self, nbytes):
bits = ''
for i in xrange(nbytes):
byte = self.readChar()
byte_as_bits = utils.bits(byte, 8)
bits += byte_as_bits
return bits
def readNBytesAsBits(self, nbytes):
bits = ''
for i in xrange(nbytes):
byte = self.readChar()
byte_as_bits = utils.bits(byte, 8)
bits += byte_as_bits
return bits
def get(self, key=''):
if not key:
return False
for one_hash in bits(self._size, self._matrix_list, key):
for one_bit in one_hash:
if not self._body[one_bit]:
return False
return True
def add(self, key):
has_new = []
for one_hash in bits(self._size, self._matrix_list, key):
for one_bit in one_hash:
if not self._body[one_bit]:
has_new.append(one_bit)
self._body[one_bit] = 1
if len(has_new) > 0:
self.save_to_storage(has_new)
return True
return False
def substitute(T):
"""
Apply SBoxes to a 48 bit input and return 32 bit output.
"""
sub = []
# The given 48 bit block is divided into eight 6 bit pieces
for i, p in enumerate(utils.nsplit(T, 6)):
# First and Last bit give the row of SBOX
row = int(str(p[0]) + str(p[5]), 2)
# And the other bits give the column
col = int("".join([str(s) for s in p[1:][:-1]]), 2)
sub += list(map(int, utils.bits(C.SBOX[i][row][col])))
return sub
def pack(self, value, bits):
self.bits += utils.bits(value, bits)
def checkbit(i, width, start, end, expected):
e = utils.bitrange(i, width, start, end)
assert e == expected
assert e == utils.bits2int(utils.bits(i, width)[start:end])
def checkbit(i, width, start, end, expected):
e = utils.bitrange(i, width, start, end)
assert e == expected
assert e == utils.bits2int(utils.bits(i, width)[start:end])
def pack(self, value, bits):
self.bits += utils.bits(value, bits)