def __Rcon(self, i):
rc = [0]*self.__nRows
rc[0] = _RC[i/self.__nKeyWords]
Rcon = _Word(self.__nRows, self.__wordSize).fromList(rc)
self._debug_stream("\tRcon[%d]" % (i), Rcon,
operation='keyExpansion()\t')
return Rcon
def __init__(self, key,
nRounds=10, nRows=4, nColumns=4, wordSize=8, # stardard aes
nKeyWords=None, loglevel=_Logger._info, *args, **kwargs):
super(KeyExpansion, self).__init__(loglevel, *args, **kwargs)
self.__key = key
self.__nRounds = nRounds
self.__nRows = nRows
self.__nColumns = nColumns
self.__wordSize = wordSize
if nKeyWords:
self.__nKeyWords = nKeyWords
else:
self.__nKeyWords = nColumns
self.__sbox = _SBox(self.__wordSize, loglevel=loglevel)
self.includeInstance(self.__sbox)
self.__word = _Word(self.__nRows, self.__wordSize)
self.__keyExpanded = [None]*self.__nKeyWords
self._debug_stream("key", key, operation="keyExpansion()\t")
try:
key = _Long(self.__wordSize).toArray(key,
self.__nKeyWords *
self.__nRows *
self.__wordSize)
except:
raise Exception("Key length doesn't fit with the matrix size")
self._debug_stream("key array", key, operation="keyExpansion()\t")
self.__initialize(key)
#self.__expand(self.__nKeyWords*(self.__nRounds+1))
self._debug_stream("keyExpanded", self.__keyExpanded,
operation="keyExpansion()\t")
self._debug_stream("size of key expanded %d"
% (len(self.__keyExpanded)))
def __initialize(self, key):
for i in range(self.__nKeyWords):
subkey = key[(self.__nRows*i):(self.__nRows*i)+self.__nRows]
self.__keyExpanded[i] = \
_Word(self.__nRows, self.__wordSize).fromList(subkey)
def __init__(self, nRows, nColumns, wordSize, *args, **kwargs):
super(AddRoundKey, self).__init__(*args, **kwargs)
self.__nRows = nRows
self.__nColumns = nColumns
self.__word = _Word(nRows, wordSize)
