1 /* keysize_descriptor.c */
3 This file is part of the ARM-Crypto-Lib.
4 Copyright (C) 2006-2010 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 "keysize_descriptor.h"
30 uint8_t is_valid_keysize_P(const void* ks_desc, uint16_t keysize){
32 type = *((uint8_t*)ks_desc);
33 ks_desc = (uint8_t*)ks_desc + 1;
34 if(type==KS_TYPE_TERMINATOR)
36 if(type==KS_TYPE_LIST){
39 items = *((uint8_t*)ks_desc);
40 ks_desc = (uint8_t*)ks_desc + 1;
42 item = *((uint16_t*)ks_desc);
43 ks_desc = (uint8_t*)ks_desc + 2;
47 ks_desc = (uint8_t*)ks_desc - 2;
49 if(type==KS_TYPE_RANGE){
51 min = *((uint16_t*)ks_desc);
52 ks_desc = (uint8_t*)ks_desc + 2;
53 max = *((uint16_t*)ks_desc);
54 if(min<=keysize && keysize<=max)
57 if(type==KS_TYPE_ARG_RANGE){
58 uint16_t max, min, dist, offset;
59 min = *((uint16_t*)ks_desc);
60 ks_desc = (uint8_t*)ks_desc + 2;
61 max = *((uint16_t*)ks_desc);
62 ks_desc = (uint8_t*)ks_desc + 2;
63 dist = *((uint16_t*)ks_desc);
64 ks_desc = (uint8_t*)ks_desc + 2;
65 offset = *((uint16_t*)ks_desc);
66 if(min<=keysize && keysize<=max && (keysize%dist==offset))
69 if(type>KS_TYPE_ARG_RANGE){
70 /* bad error, you may insert a big warning message here */
73 return is_valid_keysize_P((uint8_t*)ks_desc+1, keysize); /* search the next record */
76 uint16_t get_keysize(const void* ks_desc){
79 type = *((uint8_t*)ks_desc);
80 if(type==KS_TYPE_LIST)
81 ks_desc = (uint8_t*)ks_desc + 1;
82 ks_desc = (uint8_t*)ks_desc + 1;
83 keysize = *((uint16_t*)ks_desc);