diff --git a/files/o2.txt b/files/o2.txt
new file mode 100644
index 0000000..e07046f
--- /dev/null
+++ b/files/o2.txt
@@ -0,0 +1 @@
+Hello, this is a test file for encryption!
diff --git a/otp.c b/otp.c
index f6fa240..d5a8731 100644
--- a/otp.c
+++ b/otp.c
@@ -73,7 +73,6 @@ void simple_entropy_mix(unsigned char* urandom_buffer, size_t buffer_size,
 
 // Directory management
 int ensure_pads_directory(void);
-int ensure_files_directory(void);
 void get_pad_path(const char* chksum, char* pad_path, char* state_path);
 const char* get_files_directory(void);
 void get_default_file_path(const char* filename, char* result_path, size_t result_size);
@@ -83,14 +82,12 @@ uint64_t parse_size_string(const char* size_str);
 char* find_pad_by_prefix(const char* prefix);
 int list_available_pads(void);
 int show_pad_info(const char* chksum);
-int get_user_choice(int min, int max);
 void show_progress(uint64_t current, uint64_t total, time_t start_time);
 
 // File operations
 int read_state_offset(const char* pad_chksum, uint64_t* offset);
 int write_state_offset(const char* pad_chksum, uint64_t offset);
 int calculate_checksum(const char* filename, char* checksum_hex);
-void xor_checksum_256(const unsigned char* data, size_t len, unsigned char checksum[32]);
 char* custom_base64_encode(const unsigned char* input, int length);
 unsigned char* custom_base64_decode(const char* input, int* output_length);
 
@@ -852,20 +849,6 @@ int show_pad_info(const char* chksum) {
     return 0;
 }
 
-int get_user_choice(int min, int max) {
-    char input[64];
-    int choice;
-    
-    while (1) {
-        if (fgets(input, sizeof(input), stdin)) {
-            choice = atoi(input);
-            if (choice >= min && choice <= max) {
-                return choice;
-            }
-        }
-        printf("Please enter a number between %d and %d: ", min, max);
-    }
-}
 
 void show_progress(uint64_t current, uint64_t total, time_t start_time) {
     time_t now = time(NULL);
@@ -2282,15 +2265,6 @@ int ensure_pads_directory(void) {
     return 0;
 }
 
-int ensure_files_directory(void) {
-    struct stat st = {0};
-    if (stat(FILES_DIR, &st) == -1) {
-        if (mkdir(FILES_DIR, 0755) != 0) {
-            return 1;
-        }
-    }
-    return 0;
-}
 
 const char* get_files_directory(void) {
     struct stat st = {0};
@@ -2320,14 +2294,6 @@ void get_pad_path(const char* chksum, char* pad_path, char* state_path) {
 }
 
 
-// Custom XOR checksum function
-void xor_checksum_256(const unsigned char* data, size_t len, unsigned char checksum[32]) {
-    memset(checksum, 0, 32);
-    for (size_t i = 0; i < len; i++) {
-        unsigned char bucket = i % 32;
-        checksum[bucket] ^= data[i] ^ ((i >> 8) & 0xFF) ^ ((i >> 16) & 0xFF) ^ ((i >> 24) & 0xFF);
-    }
-}
 
 // Custom base64 encode function
 char* custom_base64_encode(const unsigned char* input, int length) {