dpapi.py 文件源码

def CryptUnprotectData(data, optional_entropy=None, prompt_struct=None, flags=0):
    """
    Returns a tuple of (description, data) where description is the
    the description that was passed to the CryptProtectData call and
    data is the decrypted result.
    """
    data_in = DATA_BLOB(data)
    entropy = DATA_BLOB(optional_entropy) if optional_entropy else None
    data_out = DATA_BLOB()
    ptr_description = wintypes.LPWSTR()
    res = _CryptUnprotectData(
        data_in,
        ctypes.byref(ptr_description),
        entropy,
        None, # reserved
        prompt_struct,
        flags | CRYPTPROTECT_UI_FORBIDDEN,
        data_out,
        )
    handle_nonzero_success(res)
    description = ptr_description.value
    if ptr_description.value is not None:
        ctypes.windll.kernel32.LocalFree(ptr_description)
    res = data_out.get_data()
    data_out.free()
    return description, res