1 /* keysize_descriptor.c */
3 This file is part of the Crypto-avr-lib/microcrypt-lib.
4 Copyright (C) 2009 Daniel Otte (daniel.otte@rub.de)
6 This program is free software: you can redistribute it and/or modify
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation, either version 3 of the License, or
9 (at your option) any later version.
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License for more details.
16 You should have received a copy of the GNU General Public License
17 along with this program. If not, see <http://www.gnu.org/licenses/>.
20 * \file keysize_descriptor.c
22 * \email daniel.otte@rub.de
24 * \license GPLv3 or later
28 #include <avr/pgmspace.h>
29 #include "keysize_descriptor.h"
31 uint8_t is_valid_keysize_P(PGM_VOID_P ks_desc, uint16_t keysize){
33 type = pgm_read_byte(ks_desc++);
34 if(type==KS_TYPE_TERMINATOR)
36 if(type==KS_TYPE_LIST){
39 items = pgm_read_byte(ks_desc++);
41 item = pgm_read_word(ks_desc);
48 if(type==KS_TYPE_RANGE){
50 min = pgm_read_word(ks_desc);
52 max = pgm_read_word(ks_desc);
53 if(min<=keysize && keysize<=max)
56 if(type==KS_TYPE_ARG_RANGE){
57 uint16_t max, min, dist, offset;
58 min = pgm_read_word(ks_desc);
60 max = pgm_read_word(ks_desc);
62 dist = pgm_read_word(ks_desc);
64 offset = pgm_read_word(ks_desc);
65 if(min<=keysize && keysize<=max && (keysize%dist==offset))
68 if(type>KS_TYPE_ARG_RANGE){
69 /* bad error, you may insert a big warning message here */
72 return is_valid_keysize(ks_desc+1, keysize) /* search the next record */