SCD: Clean up. Remove PADLEN for keypad input.
* scd/apdu.c (struct pininfo_s): Use iso7816_pininfo_s. (struct reader_table_s): Remove last arg from check_keypad method. (check_pcsc_keypad, check_pcsc_keypad): Remove PIN_PADLEN. (pcsc_keypad_verify, pcsc_keypad_modify): Don't check PIN_PADLEN. (send_apdu_ccid, ccid_keypad_operation): Remove PIN_PADLEN. (apdu_check_keypad, apdu_keypad_verify, apdu_keypad_modify): Likewise. * scd/apdu.h (apdu_check_keypad, apdu_keypad_verify) (apdu_keypad_modify): Remove PIN_PADLEN. * scd/ccid-driver.c (ccid_transceive_secure): Remove PIN_PADLEN. * scd/ccid-driver.h (ccid_transceive_secure): Remove PIN_PADLEN. * scd/iso7816.c (iso7816_check_keypad, iso7816_verify_kp) (iso7816_change_reference_data_kp): Remove PADLEN. * scd/iso7816.h (struct iso7816_pininfo_s): Remove PADLEN, PADCHAR.
In the OpenPGPcard specification, password comes with no padding. In
GnuPG, we support keypad input for OpenPGPcard only. Thus, it is
useless to try to support padding for keypad input.