int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
	int keyslot,
	const char *keyfile,
	size_t keyfile_size,
	const char *new_keyfile,
	size_t new_keyfile_size)
{
	return crypt_keyslot_add_by_keyfile_device_offset(cd, keyslot,
				keyfile, keyfile_size, 0,
				new_keyfile, new_keyfile_size, 0);
}
int crypt_keyslot_add_by_keyfile(struct crypt_device *cd,
	int keyslot,
	const char *keyfile,
	size_t keyfile_size,
	const char *new_keyfile,
	size_t new_keyfile_size)
{
	return crypt_keyslot_add_by_keyfile_device_offset(cd, keyslot,
				keyfile, keyfile_size, 0,
				new_keyfile, new_keyfile_size, 0);
}