-/* keysize_descriptor.c */
-/*
- This file is part of the ARM-Crypto-Lib.
- Copyright (C) 2009 Daniel Otte (daniel.otte@rub.de)
-
- This program is free software: you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation, either version 3 of the License, or
- (at your option) any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-/**
- * \file keysize_descriptor.c
- * \author Daniel Otte
- * \email daniel.otte@rub.de
- * \date 2009-01-07
- * \license GPLv3 or later
- */
-
-#include <stdint.h>
-#include <stdlib.h>
-#include "keysize_descriptor.h"
-
-uint8_t is_valid_keysize_P(const void* ks_desc, uint16_t keysize){
- uint8_t type;
- type = *((uint8_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 1;
- if(type==KS_TYPE_TERMINATOR)
- return 0;
- if(type==KS_TYPE_LIST){
- uint8_t items;
- uint16_t item;
- items = *((uint8_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 1;
- while(items--){
- item = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- if(item==keysize)
- return 1;
- }
- ks_desc = (uint8_t*)ks_desc - 2;
- }
- if(type==KS_TYPE_RANGE){
- uint16_t max, min;
- min = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- max = *((uint16_t*)ks_desc);
- if(min<=keysize && keysize<=max)
- return 1;
- }
- if(type==KS_TYPE_ARG_RANGE){
- uint16_t max, min, dist, offset;
- min = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- max = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- dist = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- offset = *((uint16_t*)ks_desc);
- if(min<=keysize && keysize<=max && (keysize%dist==offset))
- return 1;
- }
- if(type>KS_TYPE_ARG_RANGE){
- /* bad error, you may insert a big warning message here */
- return 0;
- }
- return is_valid_keysize_P((uint8_t*)ks_desc+1, keysize); /* search the next record */
-}
-
-uint16_t get_keysize(const void* ks_desc){
- uint8_t type;
- uint16_t keysize;
- type = *((uint8_t*)ks_desc);
- if(type==KS_TYPE_LIST){
- ks_desc = (uint8_t*)ks_desc + 1;
- }
- ks_desc = (uint8_t*)ks_desc + 1;
- keysize = *((uint8_t*)ks_desc);
- return keysize;
-}
-
-uint16_t get_keysizes(const void* ks_desc, uint16_t** list){
- uint8_t type;
- uint16_t items;
- uint8_t i;
- type = *((uint8_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 1;
- if(type==KS_TYPE_LIST){
- items = *((uint8_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 1;
- if(!*list){
- *list = malloc(items*2);
- if(!*list){
- return 0;
- }
- }
- for(i=0; i<items; ++i){
- ((uint16_t*)(*list))[i] = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- }
- return items;
- }
- if(type==KS_TYPE_ARG_RANGE){
- uint16_t min, max, distance, offset;
- min = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- max = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- distance = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- offset = *((uint16_t*)ks_desc);
- items = (max-min)/distance+1;
- if(min%distance!=offset){
- --items;
- min += (distance-(min%distance-offset))%distance;
- }
- if(!*list){
- *list = malloc(items*2);
- if(!*list){
- return 0;
- }
- }
- i=0;
- while(min<max){
- ((uint16_t*)*list)[i++] = min;
- min += distance;
- }
- return i;
- }
- if(type==KS_TYPE_RANGE){
- uint16_t min, max, distance=8, offset=0;
- min = *((uint16_t*)ks_desc);
- ks_desc = (uint8_t*)ks_desc + 2;
- max = *((uint16_t*)ks_desc);
- items = (max-min)/distance+1;
- if(min%distance!=offset){
- --items;
- min += (distance-(min%distance-offset))%distance;
- }
- if(!*list){
- *list = malloc(items*2);
- if(!*list){
- return 0;
- }
- }
- i=0;
- while(min<max){
- ((uint16_t*)*list)[i++] = min;
- min += distance;
- }
- return i;
- }
- return 0;
-}