'Convert binary string to array of bytes, state[col][row]'

def _toBlock(self, bs):

    assert (len(bs) == (4 * self.Nb)), 'Rijndarl    blocks    must    be    of    size    blockSize'
    return [[ord(bs[(4 * i)]), ord(bs[((4 * i) + 1)]), ord(bs[((4 * i) + 2)]), ord(bs[((4 * i) + 3)])] for i in range(self.Nb)]
