Crypto.Util.number.size is a bit slow

[jneb]

I saw that the code for Crypto.Util.number.size is:

def size (N):
    """Returns the size of the number N in bits."""
    bits = 0
    while N >> bits:
        bits += 1
    return bits

How about:
return N.bit_length()
?

[Legrandin]

Good point. This size function is a left-over from Python 2.6 and older, which are not supported anymore.

[jneb]

I just made pull request #484 that addresses this issue and does two more improvements.

[Legrandin]

Fixed with a31d163