Function reformat_hex

hashes/md5.py:46–87

Converts the given non-negative integer to hex string. Example: Suppose the input is the following: i = 1234 The input is 0x000004d2 in hex, so the little-endian hex string is "d2040000". Arguments: i {[int]} -- [integer] Raises: ValueErro

(i: int)

def reformat_hex(i: int) -> bytes:
    """
    Converts the given non-negative integer to hex string.

    Example: Suppose the input is the following:
        i = 1234

        The input is 0x000004d2 in hex, so the little-endian hex string is
        "d2040000".

    Arguments:
        i {[int]} -- [integer]

    Raises:
        ValueError -- [input is negative]

    Returns:
        8-char little-endian hex string

    >>> reformat_hex(1234)
    b'd2040000'
    >>> reformat_hex(666)
    b'9a020000'
    >>> reformat_hex(0)
    b'00000000'
    >>> reformat_hex(1234567890)
    b'd2029649'
    >>> reformat_hex(1234567890987654321)
    b'b11c6cb1'
    >>> reformat_hex(-1)
    Traceback (most recent call last):
    ...
    ValueError: Input must be non-negative
    """
    if i < 0:
        raise ValueError("Input must be non-negative")

    hex_rep = format(i, "08x")[-8:]
    little_endian_hex = b""
    for j in [3, 2, 1, 0]:
        little_endian_hex += hex_rep[2 * j : 2 * j + 2].encode("utf-8")
    return little_endian_hex


def preprocess(message: bytes) -> bytes: