04_fixed_xor.c and memory leak fixes

master
nihonium 2 years ago
parent b3aa4466f1
commit da8d2cec09
No known key found for this signature in database
GPG Key ID: 0251623741027CFC

@ -15,4 +15,6 @@ int main() {
output[i] = a[i] ^ b[i];
}
print_bytes(output, n);
free(a); free(b);
}

@ -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);
}

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@ -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));
}*/

@ -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);

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