04_fixed_xor.c and memory leak fixes

2 years ago · da8d2cec09
parent b3aa4466f1
commit da8d2cec09
5 changed files with 424 additions and 13 deletions
--- a/set1/02_fixed_xor.c
+++ b/set1/02_fixed_xor.c
@ -15,4 +15,6 @@ int main() {
        output[i] = a[i] ^ b[i];
    } 
    print_bytes(output, n); 
+
+    free(a); free(b);
 }
--- a/set1/04_xor_detect.c
+++ b/set1/04_xor_detect.c
@ -0,0 +1,34 @@
+#include <stdio.h>
+#include <float.h>
+#include <string.h>
+
+#include "utils.h"
+
+int main() {
+    char str[62];
+    char byte_str[30];
+    char buf[30];
+    char result[32];
+    double min_score = DBL_MAX;
+    double score;
+
+    int n;
+    FILE *file = fopen("4.txt", "r");
+    while(!feof(file)) {
+        fgets(str, 62, file);
+        n = scan_bytes(byte_str, str, 30);
+        for (unsigned char i = 0; i < 255; ++i) {
+           for (int j = 0; j < n; ++j)
+                  buf[j] = byte_str[j] ^ i; 
+           score = freq_score(buf, n);
+           if (score < min_score) {
+                min_score = score;
+                strncpy(result, buf, n);
+           }
+        }
+    }
+    result[31] = '\0';
+    printf("%s", result);
+
+    fclose(file); 
+}
--- a/set1/4.txt
+++ b/set1/4.txt
@ -0,0 +1,327 @@
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--- a/set1/utils.c
+++ b/set1/utils.c
@ -1,5 +1,10 @@
 #include <stdio.h>
+#include <stdlib.h>
 #include <string.h>
+#include <ctype.h>
+#include "utils.h"
+
+const double eng_freq[] = {0.08167,0.01492,0.02782,0.04253,0.12702,0.02228,0.02015,0.06094,0.06966,0.00153,0.00772,0.04025,0.02406,0.06749,0.07507,0.01929,0.00095,0.05987,0.06327,0.09056,0.02758,0.00978,0.02360,0.00150,0.01974,0.00074,0};

 int read_bytes(char *out_byte_array, int max_n) {
       char buf[2];
@ -14,22 +19,62 @@ int read_bytes(char *out_byte_array, int max_n) {
       // number of read characters
       return i;
 }
+
+int scan_bytes(char *out_byte_array, char *input, int max_n) {
+       char c;
+       int i = 0;
+
+       while ((sscanf(input, "%2hhx", &c)!= EOF) && (i < max_n)) {
+                out_byte_array[i] = c; 
+                ++i;
+                input += 2;
+       }
+       // number of read characters
+       return i;
+}
+
 void print_bytes(char *byte_array, int n) {
    for (int i = 0; i < n; ++i) {
-        printf("%hhx", byte_array[i]);
+        printf("%02hhx", byte_array[i]);
    }
 }

-int print_str_bytes(char *str, int n) {
-    for (int i = 0; i < n; ++i) {
-        printf("%hhx", str[i]);
-    }
+void freq(char *str, int n, double* freqs, char min, char max) {
+       for (int i = 0; i < n; ++i) {
+               if (str[i] >= min && str[i] <= max)
+                    freqs[str[i] - min]++;
+               else
+                    freqs[max - min + 1]++;
+       }
+    
+       for (int j = 0; j < max - min + 2; ++j)
+            freqs[j] /= n;
+}
+
+double std(double *a, const double *b, int n) {
+        double result = 0;
+        for (int i = 0; i < n; ++i)
+            result += (a[i] - b[i]) * (a[i] - b[i]); 
+        result /= n;
+        return result;
+}
+
+double freq_score(char *str, int n) {
+        double score = 0;
+        char* str_copy = (char*)malloc(n); 
+        strncpy(str_copy, str, n);
+
+        // last value is a frequency of non-alphaber symbols
+        double* freqs = (double*)malloc(('z' - 'a' + 2) * sizeof(double));
+
+        for (int i = 0; i < n; ++i)
+            if (str_copy[i] >= 'A' && str_copy[i] <='Z')
+                str_copy[i] = tolower(str[i]);  
+
+        freq(str_copy, n, freqs, 'a', 'z');

+        score = std(freqs, eng_freq, 'z' - 'a' + 2); 
+        free(str_copy);
+        free(freqs);
+        return score;
 }
-/*int main() {
-    char meow[10];
-    int n = read_bytes(meow, 10);
-    print_bytes(meow, n);
-    char *nya = "meow meow ctagirl uwu";
-    print_str_bytes(nya, strlen(nya));
-}*/
--- a/set1/utils.h
+++ b/set1/utils.h
@ -1,5 +1,8 @@
+#pragma once
+
 int read_bytes(char *output, int max_n);
+int scan_bytes(char *output, char *input, int max_n);

 void print_bytes(char *byte_array, int n);

-int print_str_bytes(char *str, int n);
+double freq_score(char *str, int n);