def str2int(s):
    """Convert a byte string to an integer.

    @param s: byte string representing a positive integer to convert
    @return: converted integer
    """
    s = bytearray(s)
    r = 0
    for c in s:
        r = (r << 8) | c
    return r
Convert a byte string to an integer.

    @param s: byte string representing a positive integer to convert
    @return: converted integer
    
python/dkim/crypto.py