129 lines
2.6 KiB
C
129 lines
2.6 KiB
C
/* bigint_io.c */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2010 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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#include "cli.h"
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#include "bigint.h"
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#include <stdlib.h>
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#include <string.h>
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void bigint_print_hex(const bigint_t* a){
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if(a->info&BIGINT_NEG_MASK){
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cli_putc('-');
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}
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// cli_putc((a->info&BIGINT_NEG_MASK)?'-':'+'); /* print sign */
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if(a->length_B!=0){
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cli_hexdump_rev(a->wordv, a->length_B);
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}else{
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cli_putc('0');
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}
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}
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#define BLOCKSIZE 20
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static uint8_t char2nibble(char c){
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if(c>='0' && c <='9'){
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return c-'0';
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}
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c |= 'A'^'a'; /* to lower case */
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if(c>='a' && c <='f'){
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return c-'a'+10;
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}
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return 0xff;
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}
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static uint16_t read_byte(void){
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uint8_t t1, t2;
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char c;
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c = cli_getc_cecho();
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if(c=='-'){
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return 0x0500;
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}
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t1 = char2nibble(c);
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if(t1 == 0xff){
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return 0x0100;
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}
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c = cli_getc_cecho();
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t2 = char2nibble(c);
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if(t2 == 0xff){
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return 0x0200|t1;
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}
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return (t1<<4)|t2;
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}
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uint8_t bigint_read_hex_echo(bigint_t* a){
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uint16_t allocated=0;
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uint8_t shift4=0;
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uint16_t t;
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a->length_B = 0;
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a->wordv = NULL;
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a->info = 0;
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for(;;){
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if(allocated-a->length_B < 1){
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uint8_t *p;
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p = realloc(a->wordv, allocated+=BLOCKSIZE);
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if(p==NULL){
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cli_putstr_P(PSTR("\r\nERROR: Out of memory!"));
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free(a->wordv);
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return 0xff;
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}
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a->wordv=p;
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}
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t = read_byte();
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if(a->length_B==0){
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if(t&0x0400){
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/* got minus */
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a->info |= BIGINT_NEG_MASK;
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continue;
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}else{
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if(t==0x0100){
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free(a->wordv);
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a->wordv=NULL;
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return 1;
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}
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}
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}
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if(t<=0x00ff){
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a->wordv[a->length_B++] = (uint8_t)t;
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}else{
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if(t&0x0200){
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shift4 = 1;
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a->wordv[a->length_B++] = (uint8_t)((t&0x0f)<<4);
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}
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break;
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}
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}
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/* we have to reverse the byte array */
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uint8_t tmp;
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uint8_t *p, *q;
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p = a->wordv;
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q = a->wordv+a->length_B-1;
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while(q>p){
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tmp = *p;
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*p = *q;
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*q = tmp;
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p++; q--;
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}
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if(shift4){
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bigint_adjust(a);
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bigint_shiftright(a, 4);
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}
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bigint_adjust(a);
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return 0;
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}
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