1 /* keysize_descriptor.c */
3 This file is part of the AVR-Crypto-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
29 #include "keysize_descriptor.h"
31 uint8_t is_valid_keysize_P(const void* ks_desc, uint16_t keysize){
33 type = *((uint8_t*)ks_desc);
34 ks_desc = (uint8_t*)ks_desc + 1;
35 if(type==KS_TYPE_TERMINATOR)
37 if(type==KS_TYPE_LIST){
40 items = *((uint8_t*)ks_desc);
41 ks_desc = (uint8_t*)ks_desc + 1;
43 item = *((uint16_t*)ks_desc);
44 ks_desc = (uint8_t*)ks_desc + 2;
48 ks_desc = (uint8_t*)ks_desc - 2;
50 if(type==KS_TYPE_RANGE){
52 min = *((uint16_t*)ks_desc);
53 ks_desc = (uint8_t*)ks_desc + 2;
54 max = *((uint16_t*)ks_desc);
55 if(min<=keysize && keysize<=max)
58 if(type==KS_TYPE_ARG_RANGE){
59 uint16_t max, min, dist, offset;
60 min = *((uint16_t*)ks_desc);
61 ks_desc = (uint8_t*)ks_desc + 2;
62 max = *((uint16_t*)ks_desc);
63 ks_desc = (uint8_t*)ks_desc + 2;
64 dist = *((uint16_t*)ks_desc);
65 ks_desc = (uint8_t*)ks_desc + 2;
66 offset = *((uint16_t*)ks_desc);
67 if(min<=keysize && keysize<=max && (keysize%dist==offset))
70 if(type>KS_TYPE_ARG_RANGE){
71 /* bad error, you may insert a big warning message here */
74 return is_valid_keysize_P((uint8_t*)ks_desc+1, keysize); /* search the next record */
77 uint16_t get_keysize(const void* ks_desc){
80 type = *((uint8_t*)ks_desc);
81 if(type==KS_TYPE_LIST){
82 ks_desc = (uint8_t*)ks_desc + 1;
84 ks_desc = (uint8_t*)ks_desc + 1;
85 keysize = *((uint8_t*)ks_desc);
89 uint16_t get_keysizes(const void* ks_desc, uint16_t** list){
93 type = *((uint8_t*)ks_desc);
94 ks_desc = (uint8_t*)ks_desc + 1;
95 if(type==KS_TYPE_LIST){
96 items = *((uint8_t*)ks_desc);
97 ks_desc = (uint8_t*)ks_desc + 1;
99 *list = malloc(items*2);
104 for(i=0; i<items; ++i){
105 ((uint16_t*)(*list))[i] = *((uint16_t*)ks_desc);
106 ks_desc = (uint8_t*)ks_desc + 2;
110 if(type==KS_TYPE_ARG_RANGE){
111 uint16_t min, max, distance, offset;
112 min = *((uint16_t*)ks_desc);
113 ks_desc = (uint8_t*)ks_desc + 2;
114 max = *((uint16_t*)ks_desc);
115 ks_desc = (uint8_t*)ks_desc + 2;
116 distance = *((uint16_t*)ks_desc);
117 ks_desc = (uint8_t*)ks_desc + 2;
118 offset = *((uint16_t*)ks_desc);
119 items = (max-min)/distance+1;
120 if(min%distance!=offset){
122 min += (distance-(min%distance-offset))%distance;
125 *list = malloc(items*2);
132 ((uint16_t*)*list)[i++] = min;
137 if(type==KS_TYPE_RANGE){
138 uint16_t min, max, distance=8, offset=0;
139 min = *((uint16_t*)ks_desc);
140 ks_desc = (uint8_t*)ks_desc + 2;
141 max = *((uint16_t*)ks_desc);
142 items = (max-min)/distance+1;
143 if(min%distance!=offset){
145 min += (distance-(min%distance-offset))%distance;
148 *list = malloc(items*2);
155 ((uint16_t*)*list)[i++] = min;