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	(void)ctrl;	(void)ctrl;

	/* An extra check which should not be necessary because the caller
	* should have made sure that a re-select is only called for
	* appropriate cards. */
	if (!app->app_local->flags.yubikey)
	return gpg_error (GPG_ERR_NOT_SUPPORTED);

	err = iso7816_select_application (app_get_slot (app),	err = iso7816_select_application (app_get_slot (app),
	piv_aid, sizeof piv_aid, 0x0001);	piv_aid, sizeof piv_aid, 0x0001);
	return err;	return err;
	}	}


		/* Check if AID is the correct one. */
		static gpg_error_t
		do_check_aid (app_t app, ctrl_t ctrl, const unsigned char *aid, size_t aidlen)
		{
		if (aidlen >= sizeof piv_aid
		&& memcmp (aid, piv_aid, sizeof piv_aid) == 0)
		return 0;

		return gpg_error (GPG_ERR_WRONG_CARD);
		}

	/* Select the PIV application on the card in SLOT. This function must	/* Select the PIV application on the card in SLOT. This function must
	* be used before any other PIV application functions. */	* be used before any other PIV application functions. */
	gpg_error_t	gpg_error_t
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	app->fnc.change_pin = do_change_chv;	app->fnc.change_pin = do_change_chv;
	app->fnc.check_pin = do_check_chv;	app->fnc.check_pin = do_check_chv;
	app->fnc.with_keygrip = do_with_keygrip;	app->fnc.with_keygrip = do_with_keygrip;
		app->fnc.check_aid = do_check_aid;

	leave:	leave:
	xfree (apt);	xfree (apt);
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