Function left_rotate_32

hashes/md5.py:253–294

Rotate the bits of a given int left by a given amount. Arguments: i {[int]} -- [given int] shift {[int]} -- [shift amount] Raises: ValueError -- [either given int or shift is negative] Returns: `i` rotated to the left by `shift` bits >>> left_

(i: int, shift: int)

def left_rotate_32(i: int, shift: int) -> int:
    """
    Rotate the bits of a given int left by a given amount.

    Arguments:
        i {[int]} -- [given int]
        shift {[int]} -- [shift amount]

    Raises:
        ValueError -- [either given int or shift is negative]

    Returns:
        `i` rotated to the left by `shift` bits

    >>> left_rotate_32(1234, 1)
    2468
    >>> left_rotate_32(1111, 4)
    17776
    >>> left_rotate_32(2147483648, 1)
    1
    >>> left_rotate_32(2147483648, 3)
    4
    >>> left_rotate_32(4294967295, 4)
    4294967295
    >>> left_rotate_32(1234, 0)
    1234
    >>> left_rotate_32(0, 0)
    0
    >>> left_rotate_32(-1, 0)
    Traceback (most recent call last):
    ...
    ValueError: Input must be non-negative
    >>> left_rotate_32(0, -1)
    Traceback (most recent call last):
    ...
    ValueError: Shift must be non-negative
    """
    if i < 0:
        raise ValueError("Input must be non-negative")
    if shift < 0:
        raise ValueError("Shift must be non-negative")
    return ((i << shift) ^ (i >> (32 - shift))) % 2**32


def md5_me(message: bytes) -> bytes: