Add brute-force-is-useless

brute-force-is-useless

@@ -0,0 +1,47 @@
+// Proof that brute force is useless. It can crack the word retoor in 8 seconds in best conditions. 
+// If it takes 8 seconds in the web, how long would it take for web?
+// I wouldn't worry too much about your password at all.
+
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include "rlib.h"
+
+unsigned long gen(char *str, int position, int length, char * expect, unsigned long attempt) {
+    if (position == length) {
+        str[position] = '\0'; 
+        return attempt;
+    }
+
+    for (char c = 'a'; c <= 'z'; c++) {
+        str[position] = c; 
+        attempt = gen(str, position + 1, length,expect, attempt + 1);  
+        if(!strcmp(str,expect))
+        { 
+            return attempt;
+        }
+    }
+    return attempt;
+}
+
+int main(int argc, char *argv[]) {
+
+    char *str = (char *)malloc((1337) * sizeof(char));
+
+    if (str == NULL) {
+        printf("Memory allocation failed!\n");
+        return 1;
+    }
+
+    char * needle = argc == 2 ? argv[1] :  "retoor";
+    size_t length = strlen(needle);
+    RBENCH(1, {
+        unsigned long attempt = gen(str, 0, length, needle, 0);
+        printf("Resolved \"%s\" within %zd combinations.\n",needle, attempt);
+    })
+
+    free(str);
+
+    return 0;
+}