'Encrypt a block, plainTextBlock must be a array of bytes [Nb by 4]'

def encryptBlock(self, plainTextBlock):

    self.state = self._toBlock(plainTextBlock)
    AddRoundKey(self, self.__expandedKey[0:self.Nb])
    for round in range(1, self.Nr):
        SubBytes(self)
        ShiftRows(self)
        MixColumns(self)
        AddRoundKey(self, self.__expandedKey[(round * self.Nb):((round + 1) * self.Nb)])
    SubBytes(self)
    ShiftRows(self)
    AddRoundKey(self, self.__expandedKey[(self.Nr * self.Nb):((self.Nr + 1) * self.Nb)])
    return self._toBString(self.state)
