Elysian Shadows

#include <stdio.h>
#include <string.h>

#define AMOUNT 10 //63
#define MAX 50

int main(int argc,char *argv[]){
	int cracked=0; //boolean to control whether the program has cracked the code or not
	int r=0; //row index
	int c[MAX]; //row column indices
	int f=1; //furthest row segment reached
	char *actualCode="056667421"; //code the agorithm is attempting to emit
	char code[MAX]; //string to store calculated code
	char codex[AMOUNT]={'0','1','2','3','4','5','6','7','8','9'}; //could be replaced easily with letters of the alphabet
	
	int i=0;
	while(i<MAX){
		c[i]=-1;
		i++;
	}
	
	while(!cracked){
		r=0;
		while(r<f){
			while(c[r]<AMOUNT){
				code[r]=codex[c[r]];
				printf("%s ",code);
				if(strcmp(code,actualCode)){ //if this is true, then the it's been cracked
					printf("\nCode is: %s\n",code);
					cracked=1;
					break;
				}else{
					c[r]++;
				}
			}
			r++;
		}
		if(c[f]==AMOUNT-1){ //has f reached 9?
			f++; //then move onto next digit
			c[f]=0; //set next digit to 0
		}else{
			c[f]++; //up f value
		}
		r=0;
		while(r<f){ //set previous values before current f to 0
			c[r]=0;
			code[r]=codex[c[r]];
			r++;
		}
		code[f]=codex[c[f]];
	}
	
	while(1); //stop program from closing
	
	return 0;
}

The Debugger has exited with status 0.
[Session started at 2011-10-02 14:40:16 +0100.]
GNU gdb 6.3.50-20050815 (Apple version gdb-1515) (Sat Jan 15 08:33:48 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin".tty /dev/ttys000
Loading program into debugger…
sharedlibrary apply-load-rules all
Program loaded.
run
[Switching to process 17381]
Running…

Code is:

cypher1554R wrote:It's a special setting that FBI embedded into all compilers that would prevent you from making code cracking programs.. Son, you can't crack code if you can't debug your own code.

szdarkhack wrote:strcmp returns 0 on success, which would be a logical 'false': http://www.cplusplus.com/reference/clib ... ng/strcmp/. Right now your algorithm exits immediately because your 'if' check will pass when the strings are *not* identical.

Add an ! in your if and it should work, unless i missed some other error.

[Session started at 2011-10-02 20:48:17 +0100.]
GNU gdb 6.3.50-20050815 (Apple version gdb-1515) (Sat Jan 15 08:33:48 UTC 2011)
Copyright 2004 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "x86_64-apple-darwin".tty /dev/ttys000
Loading program into debugger…
sharedlibrary apply-load-rules all
Program loaded.
run
[Switching to process 18245]
Running…
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szdarkhack wrote:You're initializing the entire c[] to -1, and then using that to index into the codex[] array. I'm surprised it didn't crash, but random garbage output should give you the hint that you're out of bounds on some array. Change the initialization to 0, it should fix that. By the way, the debugger is there for a reason...

Ginto8 wrote:If you actually look at what the code is outputting, it's just doing 0,1,2... up to 99 followed by \300_\377, then 000 to 999 followed by _\377, then 0000 to 9999 followed by \377, then just normal numbers. the change in the numbers isn't entirely sequential, but that's the basic pattern; this means that it is NOT cracking the code, just outputting the combinations it's tried. Also, you in fact ARE using all c[n]'s when they're -1 ("code[r]=codex[c[r]];"). Anyway, this can't really crack any codes, as it's really only outputting data it's already been given.

FunkyFermion wrote: By the time it uses a c[n] it's already > -1.

FunkyFermion wrote:

Code: Select all

	int i=0;
	while(i<MAX){
		c[i]=-1;                                               [b]// <- All c[] is initialized to -1[/b]
		i++;
	}
	
	while(!cracked){
		r=0;                                                   [b]// <- still -1[/b]
		while(r<f){                                         [b]// <- hmm, still -1[/b]
			while(c[r]<AMOUNT){                 [b]// <- yeap, STILL -1[/b]
				code[r]=codex[c[r]];          [b]// <- BOOM!! You're dead. Out of bounds.[/b]
				printf("%s ",code);
[/quote]

Yeah...