151 lines
3.4 KiB
C
151 lines
3.4 KiB
C
#include <stdio.h>
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#include <stdlib.h>
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#include "array.h"
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int potential_good_str(char *str) {
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int nb_spaces=0;
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int nb_ascii=0;
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int nb_non_ascii=0;
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int nb_words=0;
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int wordlen=0;
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int maxwordlen=0;
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int len;
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while (*str) {
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if (*str == ' ') nb_spaces++;
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if (((*str >= 'a') && (*str <= 'z')) ||
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((*str >= 'A') && (*str <= 'Z')) )
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{
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nb_ascii++;
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wordlen++;
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} else {
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if ((*str == ' ') || (*str == '.')) {
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if (wordlen>maxwordlen) {
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maxwordlen = wordlen;
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}
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if (wordlen>3) {
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nb_words++;
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}
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}
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wordlen=0;
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}
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if ((*str < 'A') || (*str > 'z')) nb_non_ascii++;
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len++;
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str++;
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}
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return (nb_words > 50);
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}
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int decode(Array str, Array code, Array res) {
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int i;
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empty_Array(res);
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if (str->length > res->max_length) {
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return 1;
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}
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for (i=0;i<str->length;i++) {
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push(res, str->chr[i] ^ code->chr[ i % code->length ]);
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}
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return 0;
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}
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int readInt(int *value, FILE* fd) {
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int tmp=0;
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int c=0;
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for(c=fgetc(fd); (c != EOF) && (c >= '0') && (c <= '9') ; c=fgetc(fd) ) {
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tmp=10*tmp + (c-'0');
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}
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*value=tmp;
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return c != EOF;
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}
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void fill_content(char *filename, Array content) {
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FILE *fd = NULL;
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int value;
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// ouverture du fichier
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fd = (FILE *)fopen(filename, "r");
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if (fd == NULL) {
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fprintf(stderr, "Impossible d'ouvrir %s\n", filename);
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exit(2);
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}
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// lecture du fichier
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while ( readInt(&value,fd) ) {
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push(content,value);
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}
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pop(content);
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fclose(fd);
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}
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int rec_crack(Array content, Array code, Array decoded, char *buffer) {
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int i;
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char tmp[4];
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int sum=0;
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char *str;
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if (code->length == code->max_length) {
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decode(content,code,decoded);
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if (potential_good_str(str_Array(decoded,buffer))) {
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fprintf(stderr,"Code: %s\nResult: %s\n",str_Array(code,tmp),buffer);
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for (str=buffer; *str; str++) {
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sum += *str;
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}
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fprintf(stderr, "Somme: %d\n",sum);
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}
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} else {
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if (code->length == 1) {
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fprintf(stderr,"%c",((code->chr[0]>20) && (code->chr[0]<127))?code->chr[0]:'.');
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}
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for (i='a';i<='z';i++) {
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push(code,i);
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rec_crack(content,code,decoded,buffer);
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pop(code);
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}
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}
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return 0;
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}
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int crack(Array content) {
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Array decoded=new_Array(content->max_length);
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Array code=new_Array(3);
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char *buffer=(char *)malloc(2000);
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/*
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char tmp[4];
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char *str;
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int sum;
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// ---
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push(code,'g');
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push(code,'o');
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push(code,'d');
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decode(content,code,decoded);
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fprintf(stderr,"Code: %s\nResult: %s\n",str_Array(code,tmp),str_Array(decoded,buffer));
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for (str=buffer; *str; str++) {
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sum += *str;
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}
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fprintf(stderr, "Somme: %d\n",sum);
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// ---
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*/
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rec_crack(content,code,decoded,buffer);
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}
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int main (int argc, char **argv) {
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Array content=new_Array(2000);
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// récupération des arguments
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if (argc<2) {
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fprintf(stderr, "Usage %s [file]\n", argv[0]);
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exit(1);
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}
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// rempli content avec le contenu du fichier 1
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fill_content(argv[1], content);
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crack(content);
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free(content);
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return 0;
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}
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