pki.py 文件源码

def pack_l2s(lnum, sep='', case='lower'):
    import ctypes
    PyLong_AsByteArray = ctypes.pythonapi._PyLong_AsByteArray
    PyLong_AsByteArray.argtypes = [ctypes.py_object,
                                   ctypes.c_char_p,
                                   ctypes.c_size_t,
                                   ctypes.c_int,
                                   ctypes.c_int]
    a = ctypes.create_string_buffer(lnum.bit_length()//8 + 1)
    PyLong_AsByteArray(lnum, a, len(a), 0, 1)
    hexbytes = ["{:02x}".format(ord(b)) for b in a.raw]
    while hexbytes[0] == '00':
        hexbytes.pop(0)
    if case == 'upper':
        return sep.join(hexbytes).upper()
    return sep.join(hexbytes)