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