Version v0.3.18 - Refactoring complete

.gitignore

@@ -5,5 +5,6 @@ Gemini.md
 TropicOfCancer-HenryMiller.txt
 .gitea_token
 true_rng/
+swiftrng/
 
 # Auto-generated files (none currently)

.rooignore

@@ -0,0 +1 @@
+otp copy.c

Makefile

@@ -1,21 +1,24 @@
 CC = gcc
-CFLAGS = -Wall -Wextra -std=c99
+CFLAGS = -Wall -Wextra -std=c99 -Iinclude
 LIBS = -lm
 LIBS_STATIC = -static -lm
 TARGET = otp
-SOURCE = otp.c
+SOURCES = $(wildcard src/*.c) nostr_chacha20.c otp.c
-CHACHA20_SOURCE = nostr_chacha20.c
+OBJS = $(SOURCES:.c=.o)
 
 # Default build target
-$(TARGET): $(SOURCE)
+$(TARGET): $(OBJS)
-	$(CC) $(CFLAGS) -o $(TARGET) $(SOURCE) $(CHACHA20_SOURCE) $(LIBS)
+	$(CC) $(CFLAGS) -o $(TARGET) $(OBJS) $(LIBS)
 
 # Static linking target
-static: $(SOURCE)
+static: $(OBJS)
-	$(CC) $(CFLAGS) -o $(TARGET) $(SOURCE) $(CHACHA20_SOURCE) $(LIBS_STATIC)
+	$(CC) $(CFLAGS) -o $(TARGET) $(OBJS) $(LIBS_STATIC)
+
+%.o: %.c
+	$(CC) $(CFLAGS) -c $< -o $@
 
 clean:
-	rm -f $(TARGET) *.pad *.state
+	rm -f $(TARGET) $(OBJS) *.pad *.state
 
 install:
 	sudo cp $(TARGET) /usr/local/bin/

include/otp.h

@@ -0,0 +1,345 @@
+#ifndef OTP_H
+#define OTP_H
+
+////////////////////////////////////////////////////////////////////////////////
+//      OTP CIPHER - FUNCTION PROTOTYPES HEADER
+//      One Time Pad Implementation v0.2.109
+//      
+//      This header file contains all function prototypes extracted from otp.c
+//      Organized by functional categories for better maintainability
+////////////////////////////////////////////////////////////////////////////////
+
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <termios.h>
+#include <sys/stat.h>
+#include <sys/ioctl.h>
+#include <time.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <ctype.h>
+
+// Constants
+#define MAX_INPUT_SIZE 4096
+#define MAX_LINE_LENGTH 1024
+#define MAX_HASH_LENGTH 65
+#define PROGRESS_UPDATE_INTERVAL (64 * 1024 * 1024)  // 64MB intervals
+#define DEFAULT_PADS_DIR "pads"
+#define FILES_DIR "files"
+#define MAX_ENTROPY_BUFFER (4 * 1024 * 1024)  // 4MB entropy buffer for large operations
+
+// Global variables - now managed through state module
+
+//////////////////////////////////////////////////////////////////////////////
+//      STATE MANAGEMENT FUNCTIONS
+//////////////////////////////////////////////////////////////////////////////
+
+// State getters and setters
+const char* get_current_pads_dir(void);
+void set_current_pads_dir(const char* dir);
+int get_interactive_mode(void);
+void set_interactive_mode(int mode);
+int get_terminal_width(void);
+int get_terminal_height(void);
+void set_terminal_dimensions(int width, int height);
+
+////////////////////////////////////////////////////////////////////////////////
+//      TYPE DEFINITIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Decrypt operation modes for universal decrypt function
+typedef enum {
+    DECRYPT_MODE_INTERACTIVE,    // Interactive text decryption with prompts
+    DECRYPT_MODE_SILENT,         // Silent text decryption (no prompts/labels)
+    DECRYPT_MODE_FILE_TO_TEXT,   // File to text output with prompts
+    DECRYPT_MODE_FILE_TO_FILE    // File to file output (binary)
+} decrypt_mode_t;
+
+// Pad filter types for selection functions
+typedef enum {
+    PAD_FILTER_ALL,           // Show all pads
+    PAD_FILTER_UNUSED_ONLY    // Show only unused pads (0% usage)
+} pad_filter_type_t;
+
+// Enhanced entropy system state structure
+typedef struct {
+    size_t target_bytes;           // Target entropy to collect
+    size_t collected_bytes;        // Bytes collected so far
+    size_t unique_keys;           // Number of unique keys pressed
+    double collection_start_time; // Start timestamp
+    double last_keypress_time;    // Last keypress timestamp
+    unsigned char quality_score;  // Entropy quality (0-100)
+    int auto_complete_enabled;    // Allow auto-complete at minimum
+    unsigned char key_histogram[256]; // Track key frequency
+} entropy_collection_state_t;
+
+////////////////////////////////////////////////////////////////////////////////
+//      CORE APPLICATION FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Main application entry points
+int main(int argc, char* argv[]);
+int interactive_mode(void);
+int command_line_mode(int argc, char* argv[]);
+int pipe_mode(int argc, char* argv[], const char* piped_text);
+
+////////////////////////////////////////////////////////////////////////////////
+//      INPUT/OUTPUT DETECTION FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Stdin detection functions
+int has_stdin_data(void);
+char* read_stdin_text(void);
+
+////////////////////////////////////////////////////////////////////////////////
+//      PREFERENCES MANAGEMENT FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Configuration and preferences handling
+int load_preferences(void);
+int save_preferences(void);
+char* get_preference(const char* key);
+int set_preference(const char* key, const char* value);
+char* get_default_pad_path(void);
+int set_default_pad_path(const char* pad_path);
+
+////////////////////////////////////////////////////////////////////////////////
+//      HARDWARE DETECTION FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// OTP thumb drive detection function
+int detect_otp_thumb_drive(char* otp_drive_path, size_t path_size);
+
+////////////////////////////////////////////////////////////////////////////////
+//      USB DRIVE MANAGEMENT FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+
+////////////////////////////////////////////////////////////////////////////////
+//      EXTERNAL TOOL INTEGRATION FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Editor and file manager functions
+char* get_preferred_editor(void);
+char* get_preferred_file_manager(void);
+int launch_text_editor(const char* initial_content, char* result_buffer, size_t buffer_size);
+int launch_file_manager(const char* start_directory, char* selected_file, size_t buffer_size);
+
+////////////////////////////////////////////////////////////////////////////////
+//      CORE CRYPTOGRAPHIC OPERATIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Primary encryption/decryption functions
+int generate_pad(uint64_t size_bytes, int show_progress);
+int encrypt_text(const char* pad_identifier, const char* input_text);
+int decrypt_text(const char* pad_identifier, const char* encrypted_message);
+int encrypt_file(const char* pad_identifier, const char* input_file, const char* output_file, int ascii_armor);
+int decrypt_file(const char* input_file, const char* output_file);
+int decrypt_binary_file(FILE* input_fp, const char* output_file);
+int decrypt_ascii_file(const char* input_file, const char* output_file);
+
+////////////////////////////////////////////////////////////////////////////////
+//      ENHANCED ENTROPY SYSTEM FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Entropy source types
+typedef enum {
+    ENTROPY_SOURCE_KEYBOARD = 1,
+    ENTROPY_SOURCE_DICE = 2,
+    ENTROPY_SOURCE_TRUERNG = 3,
+    ENTROPY_SOURCE_FILE = 4
+} entropy_source_t;
+
+// Terminal control for entropy collection
+int setup_raw_terminal(struct termios* original_termios);
+void restore_terminal(struct termios* original_termios);
+
+// Entropy collection and feedback
+int collect_entropy_with_feedback(unsigned char* entropy_buffer, size_t target_bytes,
+                                 size_t* collected_bytes, int allow_early_exit);
+void display_entropy_progress(const entropy_collection_state_t* state);
+void draw_progress_bar(double percentage, int width);
+void draw_quality_bar(double quality, int width, const char* label);
+
+// TrueRNG Device Constants (updated to match otp.c implementation)
+#define TRUERNG_VID "04D8"
+#define TRUERNG_PID "F5FE"
+#define TRUERNGPRO_VID "16D0"
+#define TRUERNGPRO_PID "0AA0"
+#define TRUERNGPROV2_VID "04D8"
+#define TRUERNGPROV2_PID "EBB5"
+
+// SwiftRNG Device Constants (same VID/PID as TrueRNG devices)
+#define SWIFT_RNG_VID "04D8"
+#define SWIFT_RNG_PID "F5FE"
+#define SWIFT_RNG_PRO_VID "16D0"
+#define SWIFT_RNG_PRO_PID "0AA0"
+#define SWIFT_RNG_PRO_V2_VID "04D8"
+#define SWIFT_RNG_PRO_V2_PID "EBB5"
+
+// TrueRNG/SwiftRNG Device Type enumeration
+typedef enum {
+    TRUERNG_ORIGINAL = 1,
+    TRUERNG_PRO = 2,
+    TRUERNG_PRO_V2 = 3,
+    SWIFT_RNG = 4,
+    SWIFT_RNG_PRO = 5,
+    SWIFT_RNG_PRO_V2 = 6
+} truerng_device_type_t;
+
+// Hardware RNG device information structure
+typedef struct {
+    char port_path[256];              // Device port path (e.g., /dev/ttyUSB0)
+    truerng_device_type_t device_type; // Device type identifier
+    char friendly_name[64];           // Human-readable device name
+    int is_working;                   // 1 if device passes basic test, 0 otherwise
+} hardware_rng_device_t;
+
+// Hardware RNG device detection and selection functions
+int detect_all_hardware_rng_devices(hardware_rng_device_t* devices, int max_devices, int* num_devices_found);
+int test_hardware_rng_device(const hardware_rng_device_t* device);
+int select_hardware_rng_device_interactive(hardware_rng_device_t* devices, int num_devices, hardware_rng_device_t* selected_device);
+int find_truerng_port(char* port_path, size_t port_path_size, truerng_device_type_t* device_type); // Legacy function for backward compatibility
+
+// TrueRNG entropy collection functions (updated to match implementation)
+int setup_truerng_serial_port(const char* port_path);
+int collect_truerng_entropy(unsigned char* entropy_buffer, size_t target_bytes, size_t* collected_bytes, int display_progress);
+int collect_truerng_entropy_from_device(const hardware_rng_device_t* device, unsigned char* entropy_buffer,
+                                       size_t target_bytes, size_t* collected_bytes, int display_progress);
+int collect_truerng_entropy_streaming_from_device(const hardware_rng_device_t* device, const char* pad_chksum,
+                                                 size_t total_bytes, int display_progress, int entropy_mode);
+const char* get_truerng_device_name(truerng_device_type_t device_type);
+int read_usb_device_info(const char* port_name, char* vid, char* pid);
+
+// Dice entropy collection functions (updated to match implementation)
+int collect_dice_entropy(unsigned char* entropy_buffer, size_t target_bytes, size_t* collected_bytes, int display_progress);
+
+// Unified entropy collection interface (updated to match implementation)
+int collect_entropy_by_source(entropy_source_t source, unsigned char* entropy_buffer, size_t target_bytes, size_t* collected_bytes, int display_progress);
+
+// Entropy quality calculation
+double calculate_timing_quality(const entropy_collection_state_t* state);
+double calculate_variety_quality(const entropy_collection_state_t* state);
+unsigned char calculate_overall_quality(const entropy_collection_state_t* state);
+double get_precise_time(void);
+
+// Entropy processing and application
+int derive_chacha20_params(const unsigned char* entropy_data, size_t entropy_size,
+                           unsigned char key[32], unsigned char nonce[12]);
+int add_entropy_to_pad(const char* pad_chksum, const unsigned char* entropy_data,
+                       size_t entropy_size, int show_progress);
+int add_entropy_direct_xor(const char* pad_chksum, const unsigned char* entropy_data,
+                          size_t entropy_size, uint64_t pad_size, int display_progress);
+int add_entropy_chacha20(const char* pad_chksum, const unsigned char* entropy_data,
+                        size_t entropy_size, uint64_t pad_size, int display_progress);
+int handle_add_entropy_to_pad(const char* pad_chksum);
+
+// Enhanced entropy system helper functions
+int update_pad_checksum_after_entropy(const char* old_chksum, char* new_chksum);
+int rename_pad_files_safely(const char* old_chksum, const char* new_chksum);
+int is_pad_unused(const char* pad_chksum);
+
+////////////////////////////////////////////////////////////////////////////////
+//      DIRECTORY MANAGEMENT FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Directory handling and path management
+int ensure_pads_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);
+void get_directory_display(const char* file_path, char* result, size_t result_size);
+
+////////////////////////////////////////////////////////////////////////////////
+//      UTILITY FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// General utility and helper functions
+uint64_t parse_size_string(const char* size_str);
+char* find_pad_by_prefix(const char* prefix);
+int show_pad_info(const char* chksum);
+void show_progress(uint64_t current, uint64_t total, time_t start_time);
+void format_time_remaining(double seconds, char* buffer, size_t buffer_size);
+
+////////////////////////////////////////////////////////////////////////////////
+//      FILE OPERATIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// File state and checksum 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);
+int calculate_checksum_with_progress(const char* filename, char* checksum_hex, int display_progress, uint64_t file_size);
+
+////////////////////////////////////////////////////////////////////////////////
+//      UNIVERSAL CORE FUNCTIONS FOR CODE CONSOLIDATION
+////////////////////////////////////////////////////////////////////////////////
+
+// Consolidated cryptographic operations
+int universal_xor_operation(const unsigned char* data, size_t data_len,
+                           const unsigned char* pad_data, unsigned char* result);
+int parse_ascii_message(const char* message, char* chksum, uint64_t* offset, char* base64_data);
+int load_pad_data(const char* pad_chksum, uint64_t offset, size_t length, unsigned char** pad_data);
+int generate_ascii_armor(const char* chksum, uint64_t offset, const unsigned char* encrypted_data,
+                        size_t data_length, char** ascii_output);
+int validate_pad_integrity(const char* pad_path, const char* expected_chksum);
+
+// Universal decrypt function - consolidates all decrypt operations
+int universal_decrypt(const char* input_data, const char* output_target, decrypt_mode_t mode);
+
+////////////////////////////////////////////////////////////////////////////////
+//      BASE64 ENCODING FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Custom base64 implementation
+char* custom_base64_encode(const unsigned char* input, int length);
+unsigned char* custom_base64_decode(const char* input, int* output_length);
+
+////////////////////////////////////////////////////////////////////////////////
+//      TERMINAL UI FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Terminal dimension and UI functions
+void init_terminal_dimensions(void);
+void print_centered_header(const char* text, int pause_before_clear);
+
+////////////////////////////////////////////////////////////////////////////////
+//      MENU SYSTEM FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Interactive menu interface functions
+void show_main_menu(void);
+int handle_generate_menu(void);
+int handle_encrypt_menu(void);
+int handle_decrypt_menu(void);
+int handle_pads_menu(void);
+int handle_text_encrypt(void);
+int handle_file_encrypt(void);
+int handle_verify_pad(const char* pad_chksum);
+int handle_delete_pad(const char* pad_chksum);
+
+////////////////////////////////////////////////////////////////////////////////
+//      ENHANCED INPUT FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Advanced input handling
+int get_filename_with_default(const char* prompt, const char* default_path, char* result, size_t result_size);
+
+////////////////////////////////////////////////////////////////////////////////
+//      PAD SELECTION FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Unified pad selection interface
+char* select_pad_interactive(const char* title, const char* prompt, pad_filter_type_t filter_type, int allow_cancel);
+
+////////////////////////////////////////////////////////////////////////////////
+//      USAGE AND HELP FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Help and usage display
+void print_usage(const char* program_name);
+
+#endif // OTP_H

otp.h

@@ -29,7 +29,7 @@
 #define PROGRESS_UPDATE_INTERVAL (64 * 1024 * 1024)  // 64MB intervals
 #define DEFAULT_PADS_DIR "pads"
 #define FILES_DIR "files"
-#define MAX_ENTROPY_BUFFER 32768  // 32KB entropy buffer
+#define MAX_ENTROPY_BUFFER (4 * 1024 * 1024)  // 4MB entropy buffer for large operations
 
 ////////////////////////////////////////////////////////////////////////////////
 //      TYPE DEFINITIONS
@@ -134,7 +134,8 @@ int decrypt_ascii_file(const char* input_file, const char* output_file);
 typedef enum {
     ENTROPY_SOURCE_KEYBOARD = 1,
     ENTROPY_SOURCE_DICE = 2,
-    ENTROPY_SOURCE_TRUERNG = 3
+    ENTROPY_SOURCE_TRUERNG = 3,
+    ENTROPY_SOURCE_FILE = 4
 } entropy_source_t;
 
 // Terminal control for entropy collection
@@ -156,17 +157,45 @@ void draw_quality_bar(double quality, int width, const char* label);
 #define TRUERNGPROV2_VID "04D8"
 #define TRUERNGPROV2_PID "EBB5"
 
-// TrueRNG Device Type enumeration
+// SwiftRNG Device Constants (same VID/PID as TrueRNG devices)
+#define SWIFT_RNG_VID "04D8"
+#define SWIFT_RNG_PID "F5FE"
+#define SWIFT_RNG_PRO_VID "16D0"
+#define SWIFT_RNG_PRO_PID "0AA0"
+#define SWIFT_RNG_PRO_V2_VID "04D8"
+#define SWIFT_RNG_PRO_V2_PID "EBB5"
+
+// TrueRNG/SwiftRNG Device Type enumeration
 typedef enum {
     TRUERNG_ORIGINAL = 1,
     TRUERNG_PRO = 2,
-    TRUERNG_PRO_V2 = 3
+    TRUERNG_PRO_V2 = 3,
+    SWIFT_RNG = 4,
+    SWIFT_RNG_PRO = 5,
+    SWIFT_RNG_PRO_V2 = 6
 } truerng_device_type_t;
 
+// Hardware RNG device information structure
+typedef struct {
+    char port_path[256];              // Device port path (e.g., /dev/ttyUSB0)
+    truerng_device_type_t device_type; // Device type identifier
+    char friendly_name[64];           // Human-readable device name
+    int is_working;                   // 1 if device passes basic test, 0 otherwise
+} hardware_rng_device_t;
+
+// Hardware RNG device detection and selection functions
+int detect_all_hardware_rng_devices(hardware_rng_device_t* devices, int max_devices, int* num_devices_found);
+int test_hardware_rng_device(const hardware_rng_device_t* device);
+int select_hardware_rng_device_interactive(hardware_rng_device_t* devices, int num_devices, hardware_rng_device_t* selected_device);
+int find_truerng_port(char* port_path, size_t port_path_size, truerng_device_type_t* device_type); // Legacy function for backward compatibility
+
 // TrueRNG entropy collection functions (updated to match implementation)
-int find_truerng_port(char* port_path, size_t port_path_size, truerng_device_type_t* device_type);
 int setup_truerng_serial_port(const char* port_path);
 int collect_truerng_entropy(unsigned char* entropy_buffer, size_t target_bytes, size_t* collected_bytes, int display_progress);
+int collect_truerng_entropy_from_device(const hardware_rng_device_t* device, unsigned char* entropy_buffer,
+                                       size_t target_bytes, size_t* collected_bytes, int display_progress);
+int collect_truerng_entropy_streaming_from_device(const hardware_rng_device_t* device, const char* pad_chksum,
+                                                 size_t total_bytes, int display_progress, int entropy_mode);
 const char* get_truerng_device_name(truerng_device_type_t device_type);
 int read_usb_device_info(const char* port_name, char* vid, char* pid);
 
@@ -187,6 +216,10 @@ int derive_chacha20_params(const unsigned char* entropy_data, size_t entropy_siz
                            unsigned char key[32], unsigned char nonce[12]);
 int add_entropy_to_pad(const char* pad_chksum, const unsigned char* entropy_data,
                        size_t entropy_size, int show_progress);
+int add_entropy_direct_xor(const char* pad_chksum, const unsigned char* entropy_data,
+                          size_t entropy_size, uint64_t pad_size, int display_progress);
+int add_entropy_chacha20(const char* pad_chksum, const unsigned char* entropy_data,
+                        size_t entropy_size, uint64_t pad_size, int display_progress);
 int handle_add_entropy_to_pad(const char* pad_chksum);
 
 // Enhanced entropy system helper functions
@@ -223,6 +256,7 @@ void show_progress(uint64_t current, uint64_t total, time_t start_time);
 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);
+int calculate_checksum_with_progress(const char* filename, char* checksum_hex, int display_progress, uint64_t file_size);
 
 ////////////////////////////////////////////////////////////////////////////////
 //      UNIVERSAL CORE FUNCTIONS FOR CODE CONSOLIDATION
@@ -248,6 +282,14 @@ int universal_decrypt(const char* input_data, const char* output_target, decrypt
 char* custom_base64_encode(const unsigned char* input, int length);
 unsigned char* custom_base64_decode(const char* input, int* output_length);
 
+////////////////////////////////////////////////////////////////////////////////
+//      TERMINAL UI FUNCTIONS
+////////////////////////////////////////////////////////////////////////////////
+
+// Terminal dimension and UI functions
+void init_terminal_dimensions(void);
+void print_centered_header(const char* text, int pause_before_clear);
+
 ////////////////////////////////////////////////////////////////////////////////
 //      MENU SYSTEM FUNCTIONS
 ////////////////////////////////////////////////////////////////////////////////
@@ -260,6 +302,8 @@ int handle_decrypt_menu(void);
 int handle_pads_menu(void);
 int handle_text_encrypt(void);
 int handle_file_encrypt(void);
+int handle_verify_pad(const char* pad_chksum);
+int handle_delete_pad(const char* pad_chksum);
 
 ////////////////////////////////////////////////////////////////////////////////
 //      ENHANCED INPUT FUNCTIONS

src/entropy.c

@@ -0,0 +1,810 @@
+#define _POSIX_C_SOURCE 200809L
+#define _DEFAULT_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/ioctl.h>
+#include <dirent.h>
+#include <time.h>
+#include <ctype.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <math.h>
+#include "../nostr_chacha20.h"
+#include "../include/otp.h"
+
+
+// In-place pad entropy addition using Chacha20 or direct XOR
+int add_entropy_to_pad(const char* pad_chksum, const unsigned char* entropy_data,
+                       size_t entropy_size, int display_progress) {
+    if (!pad_chksum || !entropy_data || entropy_size < 512) {
+        printf("Error: Invalid entropy data or insufficient entropy\n");
+        return 1;
+    }
+
+    // Get pad file path
+    char pad_path[1024];
+    char state_path[1024];
+    get_pad_path(pad_chksum, pad_path, state_path);
+
+    // Check if pad exists and get size
+    struct stat pad_stat;
+    if (stat(pad_path, &pad_stat) != 0) {
+        printf("Error: Pad file not found: %s\n", pad_path);
+        return 1;
+    }
+
+    uint64_t pad_size = pad_stat.st_size;
+
+    // Determine entropy addition method based on entropy size vs pad size
+    if (entropy_size >= pad_size) {
+        // Use direct XOR when entropy >= pad size
+        return add_entropy_direct_xor(pad_chksum, entropy_data, entropy_size, pad_size, display_progress);
+    } else {
+        // Use ChaCha20 when entropy < pad size
+        return add_entropy_chacha20(pad_chksum, entropy_data, entropy_size, pad_size, display_progress);
+    }
+}
+
+// Direct XOR entropy addition for large entropy sources
+int add_entropy_direct_xor(const char* pad_chksum, const unsigned char* entropy_data,
+                          size_t entropy_size, uint64_t pad_size, int display_progress) {
+    // Get pad file path
+    char pad_path[1024];
+    char state_path[1024];
+    get_pad_path(pad_chksum, pad_path, state_path);
+
+    // Open pad file for read/write
+    FILE* pad_file = fopen(pad_path, "r+b");
+    if (!pad_file) {
+        printf("Error: Cannot open pad file for modification: %s\n", pad_path);
+        printf("Note: Pad files are read-only. Temporarily changing permissions...\n");
+
+        // Try to make writable temporarily
+        if (chmod(pad_path, S_IRUSR | S_IWUSR) != 0) {
+            printf("Error: Cannot change pad file permissions\n");
+            return 1;
+        }
+
+        pad_file = fopen(pad_path, "r+b");
+        if (!pad_file) {
+            printf("Error: Still cannot open pad file for modification\n");
+            // Restore read-only
+            chmod(pad_path, S_IRUSR);
+            return 1;
+        }
+    }
+
+    if (display_progress) {
+        printf("Adding entropy to pad using direct XOR...\n");
+        printf("Pad size: %.2f GB (%lu bytes)\n", (double)pad_size / (1024.0*1024.0*1024.0), pad_size);
+        printf("Entropy size: %zu bytes\n", entropy_size);
+    }
+
+    // Process pad in chunks
+    unsigned char buffer[64 * 1024]; // 64KB chunks
+    size_t entropy_offset = 0;
+    uint64_t offset = 0;
+    time_t start_time = time(NULL);
+
+    while (offset < pad_size) {
+        size_t chunk_size = sizeof(buffer);
+        if (pad_size - offset < chunk_size) {
+            chunk_size = pad_size - offset;
+        }
+
+        // Read current pad data
+        if (fread(buffer, 1, chunk_size, pad_file) != chunk_size) {
+            printf("Error: Cannot read pad data at offset %lu\n", offset);
+            fclose(pad_file);
+            chmod(pad_path, S_IRUSR); // Restore read-only
+            return 1;
+        }
+
+        // XOR with entropy data (wrap around if entropy smaller than pad)
+        for (size_t i = 0; i < chunk_size; i++) {
+            buffer[i] ^= entropy_data[entropy_offset % entropy_size];
+            entropy_offset++;
+        }
+
+        // Seek back and write modified data
+        if (fseek(pad_file, offset, SEEK_SET) != 0) {
+            printf("Error: Cannot seek to offset %lu\n", offset);
+            fclose(pad_file);
+            chmod(pad_path, S_IRUSR);
+            return 1;
+        }
+
+        if (fwrite(buffer, 1, chunk_size, pad_file) != chunk_size) {
+            printf("Error: Cannot write modified pad data\n");
+            fclose(pad_file);
+            chmod(pad_path, S_IRUSR);
+            return 1;
+        }
+
+        offset += chunk_size;
+
+        // Show progress for large pads
+        if (display_progress && offset % (64 * 1024 * 1024) == 0) { // Every 64MB
+            show_progress(offset, pad_size, start_time);
+        }
+    }
+
+    fclose(pad_file);
+
+    // Restore read-only permissions
+    if (chmod(pad_path, S_IRUSR) != 0) {
+        printf("Warning: Cannot restore pad file to read-only\n");
+    }
+
+    if (display_progress) {
+        show_progress(pad_size, pad_size, start_time);
+        printf("\n✓ Entropy successfully added to pad using direct XOR\n");
+        printf("✓ Pad integrity maintained\n");
+        printf("✓ %zu bytes of entropy distributed across entire pad\n", entropy_size);
+        printf("✓ Pad restored to read-only mode\n");
+
+        // Update checksum after entropy addition
+        printf("\n🔄 Updating pad checksum...\n");
+        char new_chksum[65];
+        int checksum_result = update_pad_checksum_after_entropy(pad_chksum, new_chksum);
+
+        if (checksum_result == 0) {
+            printf("✓ Pad checksum updated successfully\n");
+            printf("  Old checksum: %.16s...\n", pad_chksum);
+            printf("  New checksum: %.16s...\n", new_chksum);
+            printf("✓ Pad files renamed to new checksum\n");
+
+            // Pause before returning to menu to let user see the success message
+            print_centered_header("Entropy Addition Complete", 1);
+        } else if (checksum_result == 2) {
+            printf("ℹ Checksum unchanged (unusual but not an error)\n");
+        } else {
+            printf("⚠ Warning: Checksum update failed (entropy was added successfully)\n");
+            printf("  You may need to manually handle the checksum update\n");
+            return 1; // Report error despite successful entropy addition
+        }
+    }
+
+    return 0;
+}
+
+// ChaCha20 entropy addition for smaller entropy sources
+int add_entropy_chacha20(const char* pad_chksum, const unsigned char* entropy_data,
+                        size_t entropy_size, uint64_t pad_size, int display_progress) {
+    // Derive Chacha20 key and nonce from entropy
+    unsigned char key[32], nonce[12];
+    if (derive_chacha20_params(entropy_data, entropy_size, key, nonce) != 0) {
+        printf("Error: Failed to derive Chacha20 parameters from entropy\n");
+        return 1;
+    }
+
+    // Get pad file path
+    char pad_path[1024];
+    char state_path[1024];
+    get_pad_path(pad_chksum, pad_path, state_path);
+
+    // Open pad file for read/write
+    FILE* pad_file = fopen(pad_path, "r+b");
+    if (!pad_file) {
+        printf("Error: Cannot open pad file for modification: %s\n", pad_path);
+        printf("Note: Pad files are read-only. Temporarily changing permissions...\n");
+
+        // Try to make writable temporarily
+        if (chmod(pad_path, S_IRUSR | S_IWUSR) != 0) {
+            printf("Error: Cannot change pad file permissions\n");
+            return 1;
+        }
+
+        pad_file = fopen(pad_path, "r+b");
+        if (!pad_file) {
+            printf("Error: Still cannot open pad file for modification\n");
+            // Restore read-only
+            chmod(pad_path, S_IRUSR);
+            return 1;
+        }
+    }
+
+    if (display_progress) {
+        printf("Adding entropy to pad using Chacha20...\n");
+        printf("Pad size: %.2f GB (%lu bytes)\n", (double)pad_size / (1024.0*1024.0*1024.0), pad_size);
+    }
+
+    // Process pad in chunks
+    unsigned char buffer[64 * 1024]; // 64KB chunks
+    unsigned char keystream[64 * 1024];
+    uint64_t offset = 0;
+    uint32_t counter = 0;
+    time_t start_time = time(NULL);
+
+    while (offset < pad_size) {
+        size_t chunk_size = sizeof(buffer);
+        if (pad_size - offset < chunk_size) {
+            chunk_size = pad_size - offset;
+        }
+
+        // Read current pad data
+        if (fread(buffer, 1, chunk_size, pad_file) != chunk_size) {
+            printf("Error: Cannot read pad data at offset %lu\n", offset);
+            fclose(pad_file);
+            chmod(pad_path, S_IRUSR); // Restore read-only
+            return 1;
+        }
+
+        // Generate keystream for this chunk
+        if (chacha20_encrypt(key, counter, nonce, buffer, keystream, chunk_size) != 0) {
+            printf("Error: Chacha20 keystream generation failed\n");
+            fclose(pad_file);
+            chmod(pad_path, S_IRUSR);
+            return 1;
+        }
+
+        // XOR existing pad with keystream (adds entropy)
+        for (size_t i = 0; i < chunk_size; i++) {
+            buffer[i] ^= keystream[i];
+        }
+
+        // Seek back and write modified data
+        if (fseek(pad_file, offset, SEEK_SET) != 0) {
+            printf("Error: Cannot seek to offset %lu\n", offset);
+            fclose(pad_file);
+            chmod(pad_path, S_IRUSR);
+            return 1;
+        }
+
+        if (fwrite(buffer, 1, chunk_size, pad_file) != chunk_size) {
+            printf("Error: Cannot write modified pad data\n");
+            fclose(pad_file);
+            chmod(pad_path, S_IRUSR);
+            return 1;
+        }
+
+        offset += chunk_size;
+        counter += (chunk_size + 63) / 64; // Round up for block count
+
+        // Show progress for large pads
+        if (display_progress && offset % (64 * 1024 * 1024) == 0) { // Every 64MB
+            show_progress(offset, pad_size, start_time);
+        }
+    }
+
+    fclose(pad_file);
+
+    // Restore read-only permissions
+    if (chmod(pad_path, S_IRUSR) != 0) {
+        printf("Warning: Cannot restore pad file to read-only\n");
+    }
+
+    if (display_progress) {
+        show_progress(pad_size, pad_size, start_time);
+        printf("\n✓ Entropy successfully added to pad using Chacha20\n");
+        printf("✓ Pad integrity maintained\n");
+        printf("✓ %zu bytes of entropy distributed across entire pad\n", entropy_size);
+        printf("✓ Pad restored to read-only mode\n");
+
+        // Update checksum after entropy addition
+        printf("\n🔄 Updating pad checksum...\n");
+        char new_chksum[65];
+        int checksum_result = update_pad_checksum_after_entropy(pad_chksum, new_chksum);
+
+        if (checksum_result == 0) {
+            printf("✓ Pad checksum updated successfully\n");
+            printf("  Old checksum: %.16s...\n", pad_chksum);
+            printf("  New checksum: %.16s...\n", new_chksum);
+            printf("✓ Pad files renamed to new checksum\n");
+
+            // Pause before returning to menu to let user see the success message
+            print_centered_header("Entropy Addition Complete", 1);
+        } else if (checksum_result == 2) {
+            printf("ℹ Checksum unchanged (unusual but not an error)\n");
+        } else {
+            printf("⚠ Warning: Checksum update failed (entropy was added successfully)\n");
+            printf("  You may need to manually handle the checksum update\n");
+            return 1; // Report error despite successful entropy addition
+        }
+    }
+
+    return 0;
+}
+
+// Enhanced entropy collection with visual feedback
+int collect_entropy_with_feedback(unsigned char* entropy_buffer, size_t target_bytes,
+                                 size_t* collected_bytes, int allow_early_exit) {
+    struct termios original_termios;
+    entropy_collection_state_t state = {0};
+
+    // Initialize state
+    state.target_bytes = target_bytes;
+    state.auto_complete_enabled = allow_early_exit;
+    state.collection_start_time = get_precise_time();
+
+    // Setup raw terminal
+    if (setup_raw_terminal(&original_termios) != 0) {
+        printf("Error: Cannot setup terminal for entropy collection\n");
+        return 1;
+    }
+
+    // Clear screen area for display
+    printf("\n\n\n\n\n\n");
+    printf("\033[2J\033[H"); // Clear screen and move to top
+
+    unsigned char entropy_block[16];
+    struct timespec timestamp;
+    uint32_t sequence_counter = 0;
+    char key;
+    unsigned char seen_keys[256] = {0};
+
+    *collected_bytes = 0;
+
+    while (state.collected_bytes < target_bytes) {
+        // Update display
+        state.quality_score = calculate_overall_quality(&state);
+        display_entropy_progress(&state);
+
+        // Non-blocking read
+        if (read(STDIN_FILENO, &key, 1) == 1) {
+            // Handle ESC key for early exit
+            if (key == 27 && allow_early_exit && state.collected_bytes >= 1024) {
+                break; // Early exit allowed
+            }
+
+            // Record keypress timing
+            double current_time = get_precise_time();
+            state.last_keypress_time = current_time;
+
+            // Update key histogram
+            state.key_histogram[(unsigned char)key]++;
+
+            // Get high precision timestamp
+            clock_gettime(CLOCK_MONOTONIC, &timestamp);
+
+            // Create enhanced entropy block: [key][timestamp][sequence][quality_bits]
+            entropy_block[0] = key;
+            memcpy(&entropy_block[1], &timestamp.tv_sec, 8);
+            memcpy(&entropy_block[9], &timestamp.tv_nsec, 4);
+            memcpy(&entropy_block[13], &sequence_counter, 2);
+            entropy_block[15] = (unsigned char)(current_time * 1000) & 0xFF; // Sub-millisecond timing
+
+            // Add to entropy buffer
+            if (state.collected_bytes + 16 <= MAX_ENTROPY_BUFFER) {
+                memcpy(entropy_buffer + state.collected_bytes, entropy_block, 16);
+                state.collected_bytes += 16;
+            }
+
+            sequence_counter++;
+
+            // Track unique keys
+            if (!seen_keys[(unsigned char)key]) {
+                seen_keys[(unsigned char)key] = 1;
+                state.unique_keys++;
+            }
+        } else {
+            // No key available, just sleep and wait for keystrokes
+            usleep(10000); // 10ms delay - wait for keystrokes, don't add timing entropy
+        }
+
+        // Auto-complete at target if enabled
+        if (state.collected_bytes >= target_bytes) {
+            break;
+        }
+    }
+
+    // Final display update
+    state.quality_score = calculate_overall_quality(&state);
+    display_entropy_progress(&state);
+
+    // Summary
+    double collection_time = get_precise_time() - state.collection_start_time;
+    printf("\n\n✓ Entropy collection complete!\n");
+    printf("  Collected: %zu bytes in %.1f seconds\n", state.collected_bytes, collection_time);
+    printf("  Quality: %d%% (Excellent: 80%%+, Good: 60%%+)\n", state.quality_score);
+    printf("  Unique keys: %zu\n", state.unique_keys);
+
+    // Restore terminal
+    restore_terminal(&original_termios);
+
+    *collected_bytes = state.collected_bytes;
+    return 0;
+}
+
+// Chacha20 key derivation from collected entropy
+int derive_chacha20_params(const unsigned char* entropy_data, size_t entropy_size,
+                          unsigned char key[32], unsigned char nonce[12]) {
+    if (!entropy_data || entropy_size < 512 || !key || !nonce) {
+        return 1; // Error: insufficient entropy or null pointers
+    }
+
+    // Phase 1: Generate base key from entropy using enhanced XOR checksum method
+    unsigned char enhanced_checksum[44]; // 32 key + 12 nonce
+    memset(enhanced_checksum, 0, 44);
+
+    // Mix entropy data similar to calculate_checksum but for 44 bytes
+    for (size_t i = 0; i < entropy_size; i++) {
+        unsigned char bucket = i % 44;
+        enhanced_checksum[bucket] ^= entropy_data[i] ^
+                                   ((i >> 8) & 0xFF) ^
+                                   ((i >> 16) & 0xFF) ^
+                                   ((i >> 24) & 0xFF);
+    }
+
+    // Phase 2: Add system entropy for additional randomness
+    unsigned char system_entropy[32];
+    FILE* urandom = fopen("/dev/urandom", "rb");
+    if (!urandom) {
+        return 2; // Error: cannot access system entropy
+    }
+
+    if (fread(system_entropy, 1, 32, urandom) != 32) {
+        fclose(urandom);
+        return 2; // Error: insufficient system entropy
+    }
+    fclose(urandom);
+
+    // Mix system entropy into derived key
+    for (int i = 0; i < 32; i++) {
+        enhanced_checksum[i] ^= system_entropy[i];
+    }
+
+    // Extract key and nonce
+    memcpy(key, enhanced_checksum, 32);
+    memcpy(nonce, enhanced_checksum + 32, 12);
+
+    return 0; // Success
+}
+
+// Collect entropy from binary file
+int collect_file_entropy(unsigned char* entropy_buffer, size_t target_bytes,
+                        size_t* collected_bytes, int display_progress) {
+    if (display_progress) {
+        print_centered_header("File Entropy Collection", 0);
+        printf("Load entropy from binary file (.bin format)\n");
+        printf("Target: %zu bytes\n", target_bytes);
+    }
+
+    printf("Enter path to binary entropy file: ");
+    fflush(stdout);
+
+    char file_path[512];
+    if (!fgets(file_path, sizeof(file_path), stdin)) {
+        printf("Error: Failed to read input\n");
+        return 1;
+    }
+
+    // Remove newline
+    file_path[strcspn(file_path, "\n")] = 0;
+
+    // Check if file exists and get size
+    struct stat file_stat;
+    if (stat(file_path, &file_stat) != 0) {
+        printf("Error: File '%s' not found\n", file_path);
+        return 1;
+    }
+
+    if (!S_ISREG(file_stat.st_mode)) {
+        printf("Error: '%s' is not a regular file\n", file_path);
+        return 1;
+    }
+
+    size_t file_size = file_stat.st_size;
+    if (file_size == 0) {
+        printf("Error: File is empty\n");
+        return 1;
+    }
+
+    if (file_size < target_bytes) {
+        printf("Warning: File size (%zu bytes) is smaller than target (%zu bytes)\n",
+               file_size, target_bytes);
+        printf("Will read available data and pad with zeros if necessary.\n");
+    }
+
+    // Open file for reading
+    FILE* entropy_file = fopen(file_path, "rb");
+    if (!entropy_file) {
+        printf("Error: Cannot open file '%s' for reading\n", file_path);
+        return 1;
+    }
+
+    if (display_progress) {
+        printf("Reading entropy from file...\n");
+    }
+
+    // Read entropy data
+    size_t bytes_to_read = (file_size < target_bytes) ? file_size : target_bytes;
+    size_t bytes_read = fread(entropy_buffer, 1, bytes_to_read, entropy_file);
+
+    if (bytes_read != bytes_to_read) {
+        printf("Error: Failed to read %zu bytes from file (read %zu)\n",
+               bytes_to_read, bytes_read);
+        fclose(entropy_file);
+        return 1;
+    }
+
+    fclose(entropy_file);
+
+    // Pad with zeros if file was smaller than target
+    if (bytes_read < target_bytes) {
+        memset(entropy_buffer + bytes_read, 0, target_bytes - bytes_read);
+        *collected_bytes = target_bytes; // We padded to target size
+    } else {
+        *collected_bytes = bytes_read;
+    }
+
+    if (display_progress) {
+        printf("✓ File entropy collection complete!\n");
+        printf("  File: %s\n", file_path);
+        printf("  Read: %zu bytes\n", bytes_read);
+        printf("  Total: %zu bytes (padded to target if necessary)\n", *collected_bytes);
+    }
+
+    return 0; // Success
+}
+
+// Collect entropy by source type with unified interface
+int collect_entropy_by_source(entropy_source_t source, unsigned char* entropy_buffer,
+                              size_t target_bytes, size_t* collected_bytes, int display_progress) {
+    switch (source) {
+        case ENTROPY_SOURCE_KEYBOARD:
+            return collect_entropy_with_feedback(entropy_buffer, target_bytes, collected_bytes, 1);
+
+        case ENTROPY_SOURCE_TRUERNG:
+            return collect_truerng_entropy(entropy_buffer, target_bytes, collected_bytes, display_progress);
+
+        case ENTROPY_SOURCE_DICE:
+            return collect_dice_entropy(entropy_buffer, target_bytes, collected_bytes, display_progress);
+
+        case ENTROPY_SOURCE_FILE:
+            return collect_file_entropy(entropy_buffer, target_bytes, collected_bytes, display_progress);
+
+        default:
+            if (display_progress) {
+                printf("Error: Unknown entropy source\n");
+            }
+            return 1;
+    }
+}
+
+// Collect manual entropy from any printable character input
+int collect_dice_entropy(unsigned char* entropy_buffer, size_t target_bytes,
+                        size_t* collected_bytes, int display_progress) {
+    if (display_progress) {
+        print_centered_header("Manual Entropy Collection", 0);
+        printf("Enter any text, numbers, or symbols for entropy.\n");
+        printf("Target: %zu bytes (%zu characters needed)\n", target_bytes, target_bytes);
+        printf("Press Enter after each line, or 'done' when finished.\n\n");
+    }
+
+    size_t bytes_written = 0;
+
+    char input[256];
+
+    while (bytes_written < target_bytes) {
+        if (display_progress) {
+            double percentage = (double)bytes_written / target_bytes * 100.0;
+            printf("Progress: %.1f%% (%zu/%zu bytes) - Enter text: ",
+                   percentage, bytes_written, target_bytes);
+            fflush(stdout);
+        }
+
+        if (!fgets(input, sizeof(input), stdin)) {
+            if (display_progress) {
+                printf("Error: Failed to read input\n");
+            }
+            return 1;
+        }
+
+        // Remove newline
+        input[strcspn(input, "\n")] = 0;
+
+        // Check for done command
+        if (strcmp(input, "done") == 0 && bytes_written >= target_bytes / 2) {
+            break; // Allow early exit if we have at least half the target
+        }
+
+        // Process each printable character as 8 bits of entropy
+        for (size_t i = 0; input[i] && bytes_written < target_bytes; i++) {
+            char c = input[i];
+            if (c >= 32 && c <= 126) { // Printable ASCII characters
+                entropy_buffer[bytes_written++] = (unsigned char)c;
+            }
+        }
+    }
+
+    if (display_progress) {
+        printf("\n✓ Manual entropy collection complete!\n");
+        printf("  Collected: %zu bytes from text input\n", bytes_written);
+        printf("  Entropy quality: 8 bits per character\n");
+    }
+
+    *collected_bytes = bytes_written;
+    return 0; // Success
+}
+
+void restore_terminal(struct termios* original_termios) {
+    tcsetattr(STDIN_FILENO, TCSANOW, original_termios);
+
+    // Reset stdin to blocking
+    int flags = fcntl(STDIN_FILENO, F_GETFL);
+    fcntl(STDIN_FILENO, F_SETFL, flags & ~O_NONBLOCK);
+}
+double get_precise_time(void) {
+    struct timespec ts;
+    clock_gettime(CLOCK_MONOTONIC, &ts);
+    return ts.tv_sec + ts.tv_nsec / 1000000000.0;
+}
+
+void draw_progress_bar(double percentage, int width) {
+    int filled = (int)(percentage / 100.0 * width);
+    if (filled > width) filled = width;
+
+    printf("[");
+    for (int i = 0; i < filled; i++) {
+        printf("█");
+    }
+    for (int i = filled; i < width; i++) {
+        printf("░");
+    }
+    printf("]");
+}
+
+void draw_quality_bar(double quality, int width, const char* label) {
+    int filled = (int)(quality / 100.0 * width);
+    if (filled > width) filled = width;
+
+    // Color coding based on quality
+    const char* color;
+    if (quality >= 80) color = "\033[32m"; // Green
+    else if (quality >= 60) color = "\033[33m"; // Yellow
+    else color = "\033[31m"; // Red
+
+    printf("%s", color);
+    draw_progress_bar(quality, width);
+    printf("\033[0m %-10s", label); // Reset color
+}
+
+double calculate_timing_quality(const entropy_collection_state_t* state) {
+    // Analyze timing variance between keypresses
+    if (state->collected_bytes < 32) return 0.0; // Need minimum data
+
+    // Simplified timing quality based on collection rate and variation
+    double elapsed = get_precise_time() - state->collection_start_time;
+    if (elapsed < 0.1) return 0.0;
+
+    double rate = state->collected_bytes / elapsed;
+
+    // Optimal rate is around 50-200 bytes/second (moderate typing with good timing variance)
+    if (rate >= 50 && rate <= 200) return 90.0;
+    if (rate >= 20 && rate <= 500) return 70.0;
+    if (rate >= 10 && rate <= 1000) return 50.0;
+    return 30.0;
+}
+
+double calculate_variety_quality(const entropy_collection_state_t* state) {
+    // Analyze key variety and distribution
+    if (state->collected_bytes < 16) return 0.0;
+
+    // Calculate entropy from key histogram
+    double entropy = 0.0;
+    size_t total_keys = 0;
+
+    // Count total keypresses
+    for (int i = 0; i < 256; i++) {
+        total_keys += state->key_histogram[i];
+    }
+
+    if (total_keys == 0) return 0.0;
+
+    // Calculate Shannon entropy
+    for (int i = 0; i < 256; i++) {
+        if (state->key_histogram[i] > 0) {
+            double p = (double)state->key_histogram[i] / total_keys;
+            entropy -= p * log2(p);
+        }
+    }
+
+    // Convert entropy to quality score (0-100)
+    double max_entropy = log2(256); // Perfect entropy for 8-bit keyspace
+    double normalized_entropy = entropy / max_entropy;
+
+    // Scale based on unique keys as well
+    double unique_key_factor = (double)state->unique_keys / 50.0; // 50+ unique keys is excellent
+    if (unique_key_factor > 1.0) unique_key_factor = 1.0;
+
+    return (normalized_entropy * 70.0 + unique_key_factor * 30.0);
+}
+
+unsigned char calculate_overall_quality(const entropy_collection_state_t* state) {
+    double timing = calculate_timing_quality(state);
+    double variety = calculate_variety_quality(state);
+
+    // Simple collection progress bonus
+    double progress_bonus = (double)state->collected_bytes / state->target_bytes * 20.0;
+    if (progress_bonus > 20.0) progress_bonus = 20.0;
+
+    // Weighted average
+    double overall = (timing * 0.4 + variety * 0.4 + progress_bonus);
+    if (overall > 100.0) overall = 100.0;
+
+    return (unsigned char)overall;
+}
+
+void display_entropy_progress(const entropy_collection_state_t* state) {
+    // Calculate percentages
+    double progress = (double)state->collected_bytes / state->target_bytes * 100.0;
+    if (progress > 100.0) progress = 100.0;
+
+    double quality = state->quality_score;
+    double timing_quality = calculate_timing_quality(state);
+    double variety_quality = calculate_variety_quality(state);
+
+    // Clear previous output and redraw
+    printf("\033[2K\r"); // Clear line
+    printf("\033[A\033[2K\r"); // Move up and clear
+    printf("\033[A\033[2K\r"); // Move up and clear
+    printf("\033[A\033[2K\r"); // Move up and clear
+    printf("\033[A\033[2K\r"); // Move up and clear
+    printf("\033[A\033[2K\r"); // Move up and clear
+
+    // Header
+    printf("Adding Entropy to Pad - Target: %zu bytes\n\n", state->target_bytes);
+
+    // Main progress bar
+    printf("Progress: ");
+    draw_progress_bar(progress, 50);
+    printf(" %.1f%% (%zu/%zu bytes)\n", progress, state->collected_bytes, state->target_bytes);
+
+    // Quality indicators
+    printf("Quality:  ");
+    draw_quality_bar(quality, 50, "OVERALL");
+    printf("\n");
+
+    printf("Timing:   ");
+    draw_quality_bar(timing_quality, 50, "VARIED");
+    printf("\n");
+
+    printf("Keys:     ");
+    draw_quality_bar(variety_quality, 50, "DIVERSE");
+    printf("\n");
+
+    // Instructions
+    if (state->collected_bytes >= 1024 && state->auto_complete_enabled) {
+        printf("\nPress ESC to finish (minimum reached) or continue typing...");
+    } else if (state->collected_bytes < 1024) {
+        printf("\nType random keys... (%zu more bytes needed)", 1024 - state->collected_bytes);
+    } else {
+        printf("\nType random keys or press ESC when satisfied...");
+    }
+
+    fflush(stdout);
+}
+
+// Keyboard entropy functions
+int setup_raw_terminal(struct termios* original_termios) {
+    struct termios new_termios;
+
+    if (tcgetattr(STDIN_FILENO, original_termios) != 0) {
+        return 1;
+    }
+
+    new_termios = *original_termios;
+    new_termios.c_lflag &= ~(ICANON | ECHO);
+    new_termios.c_cc[VMIN] = 0;
+    new_termios.c_cc[VTIME] = 0;
+
+    if (tcsetattr(STDIN_FILENO, TCSANOW, &new_termios) != 0) {
+        return 1;
+    }
+
+    // Set stdin to non-blocking
+    int flags = fcntl(STDIN_FILENO, F_GETFL);
+    if (fcntl(STDIN_FILENO, F_SETFL, flags | O_NONBLOCK) == -1) {
+        tcsetattr(STDIN_FILENO, TCSANOW, original_termios);
+        return 1;
+    }
+
+    return 0;
+}

src/main.c

@@ -0,0 +1,270 @@
+#define _POSIX_C_SOURCE 200809L
+#define _DEFAULT_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/ioctl.h>
+#include <dirent.h>
+#include <time.h>
+#include <ctype.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <math.h>
+#include "../include/otp.h"
+
+int main(int argc, char* argv[]) {
+    // Initialize terminal dimensions first
+    init_terminal_dimensions();
+
+    // Load preferences
+    load_preferences();
+
+    // Detect interactive mode: true when running with no arguments AND no piped input
+    int is_interactive = (argc == 1 && !has_stdin_data());
+    set_interactive_mode(is_interactive);
+
+    // Check for OTP thumb drive on startup
+    char otp_drive_path[512];
+    if (detect_otp_thumb_drive(otp_drive_path, sizeof(otp_drive_path))) {
+        // Only show messages in interactive mode
+        if (get_interactive_mode()) {
+            printf("Detected OTP thumb drive: %s\n", otp_drive_path);
+            printf("Using as default pads directory for this session.\n\n");
+        }
+        set_current_pads_dir(otp_drive_path);
+    }
+
+    if (get_interactive_mode()) {
+        return interactive_mode();
+    } else {
+        return command_line_mode(argc, argv);
+    }
+}
+
+int command_line_mode(int argc, char* argv[]) {
+    // Check for help flags first (only if we have arguments)
+    if (argc > 1 && (strcmp(argv[1], "-h") == 0 || strcmp(argv[1], "--h") == 0 ||
+        strcmp(argv[1], "-help") == 0 || strcmp(argv[1], "--help") == 0 ||
+        strcmp(argv[1], "help") == 0)) {
+        print_usage(argv[0]);
+        return 0;
+    }
+
+    // If no arguments but piped input, default to encrypt mode
+    if (argc == 1 && has_stdin_data()) {
+        char* piped_text = read_stdin_text();
+        if (piped_text) {
+            int result = pipe_mode(argc, argv, piped_text);
+            free(piped_text);
+            return result;
+        }
+    }
+
+    if (argc > 1 && (strcmp(argv[1], "generate") == 0 || strcmp(argv[1], "-g") == 0)) {
+        if (argc != 3) {
+            printf("Usage: %s generate|-g <size>\n", argv[0]);
+            printf("Size examples: 1024, 1GB, 5TB, 512MB\n");
+            return 1;
+        }
+        uint64_t size = parse_size_string(argv[2]);
+        if (size == 0) {
+            printf("Error: Invalid size format\n");
+            return 1;
+        }
+        return generate_pad(size, 1);  // Use simplified pad generation
+    }
+    else if (strcmp(argv[1], "encrypt") == 0 || strcmp(argv[1], "-e") == 0) {
+        // Check for piped input first
+        if (has_stdin_data()) {
+            char* piped_text = read_stdin_text();
+            if (piped_text) {
+                int result = pipe_mode(argc, argv, piped_text);
+                free(piped_text);
+                return result;
+            }
+        }
+
+        if (argc < 2 || argc > 4) {
+            printf("Usage: %s encrypt|-e [pad_chksum_or_prefix] [text_to_encrypt]\n", argv[0]);
+            return 1;
+        }
+
+        // Check if pad was specified or use default
+        const char* pad_identifier = NULL;
+        const char* text = NULL;
+
+        if (argc == 2) {
+            // Just -e, use default pad, no text (interactive)
+            pad_identifier = NULL;
+            text = NULL;
+        } else if (argc == 3) {
+            // Could be -e <pad> or -e <text> (using default pad)
+            // Check if default pad is available to determine interpretation
+            char* default_pad = get_default_pad_path();
+            if (default_pad) {
+                // Default pad available, treat argument as text
+                pad_identifier = NULL;
+                text = argv[2];
+                free(default_pad);
+            } else {
+                // No default pad, treat as pad identifier
+                pad_identifier = argv[2];
+                text = NULL;
+            }
+        } else {
+            // argc == 4: -e <pad> <text>
+            pad_identifier = argv[2];
+            text = argv[3];
+        }
+
+        // If pad_identifier is NULL, we need to use default pad
+        if (pad_identifier == NULL) {
+            char* default_pad = get_default_pad_path();
+            if (default_pad) {
+                // Extract checksum from default pad path
+                char* filename = strrchr(default_pad, '/');
+                if (!filename) filename = default_pad;
+                else filename++; // Skip the '/'
+
+                // Extract checksum (remove .pad extension)
+                if (strlen(filename) >= 68 && strstr(filename, ".pad")) {
+                    static char default_checksum[65];
+                    strncpy(default_checksum, filename, 64);
+                    default_checksum[64] = '\0';
+                    pad_identifier = default_checksum;
+                }
+                free(default_pad);
+
+                // Call encrypt_text and return result
+                return encrypt_text(pad_identifier, text);
+            } else {
+                printf("Error: No default pad configured. Specify pad explicitly or configure default pad.\n");
+                return 1;
+            }
+        } else {
+            // Explicit pad specified, normal operation
+            return encrypt_text(pad_identifier, text);
+        }
+    }
+    else if (strcmp(argv[1], "decrypt") == 0 || strcmp(argv[1], "-d") == 0) {
+        if (argc == 2) {
+            // Check for piped input first
+            if (has_stdin_data()) {
+                // Piped decrypt mode - read stdin and decrypt silently
+                char* piped_message = read_stdin_text();
+                if (piped_message) {
+                    int result = decrypt_text(NULL, piped_message);
+                    free(piped_message);
+                    return result;
+                }
+            }
+            // Interactive mode - no arguments needed
+            return decrypt_text(NULL, NULL);
+        }
+        else if (argc == 3) {
+            // Check if the argument looks like an encrypted message (starts with -----)
+            if (strncmp(argv[2], "-----BEGIN OTP MESSAGE-----", 27) == 0) {
+                // Inline decrypt with message only - use silent mode for command line
+                return decrypt_text(NULL, argv[2]);
+            } else {
+                // Check if it's a file (contains . or ends with known extensions)
+                if (strstr(argv[2], ".") != NULL) {
+                    // Treat as file
+                    return decrypt_file(argv[2], NULL);
+                } else {
+                    // Interactive decrypt with pad hint (legacy support)
+                    return decrypt_text(argv[2], NULL);
+                }
+            }
+        }
+        else if (argc == 4) {
+            // Check for -o flag for output file
+            if (strcmp(argv[2], "-o") == 0) {
+                printf("Usage: %s decrypt|-d <input_file> [-o <output_file>]\n", argv[0]);
+                return 1;
+            } else {
+                // Legacy format: pad_chksum and message, or file with output
+                // Use silent mode for command line when message is provided
+                return decrypt_text(argv[2], argv[3]);
+            }
+        }
+        else if (argc == 5 && strcmp(argv[3], "-o") == 0) {
+            // File decryption with output: -d <input_file> -o <output_file>
+            return decrypt_file(argv[2], argv[4]);
+        }
+        else {
+            printf("Usage: %s decrypt|-d [encrypted_message|file] [-o output_file]\n", argv[0]);
+            printf("       %s decrypt|-d [encrypted_message]  (pad info from message)\n", argv[0]);
+            return 1;
+        }
+    }
+    else if (strcmp(argv[1], "-f") == 0) {
+        // File encryption mode: -f <input_file> <pad_prefix> [-a] [-o <output_file>]
+        if (argc < 4) {
+            printf("Usage: %s -f <input_file> <pad_prefix> [-a] [-o <output_file>]\n", argv[0]);
+            return 1;
+        }
+
+        const char* input_file = argv[2];
+        const char* pad_prefix = argv[3];
+        int ascii_armor = 0;
+        const char* output_file = NULL;
+
+        // Parse optional flags
+        for (int i = 4; i < argc; i++) {
+            if (strcmp(argv[i], "-a") == 0) {
+                ascii_armor = 1;
+            } else if (strcmp(argv[i], "-o") == 0 && i + 1 < argc) {
+                output_file = argv[++i];
+            }
+        }
+
+        return encrypt_file(pad_prefix, input_file, output_file, ascii_armor);
+    }
+    else if (strcmp(argv[1], "list") == 0 || strcmp(argv[1], "-l") == 0) {
+        printf("Available pads:\n");
+        char* selected = select_pad_interactive("Available pads:", "Select pad (or press Enter to exit)", PAD_FILTER_ALL, 0);
+        if (selected) {
+            free(selected);
+        }
+        return 0;
+    }
+    else {
+        print_usage(argv[0]);
+        return 1;
+    }
+}
+
+void print_usage(const char* program_name) {
+    printf("OTP Cipher - One Time Pad Implementation v0.3.16\n");
+    printf("Built for testing entropy system\n");
+    printf("Usage:\n");
+    printf("  %s                                         - Interactive mode\n", program_name);
+    printf("  %s generate|-g <size>                      - Generate new pad\n", program_name);
+    printf("  %s encrypt|-e [pad_checksum_prefix] [text] - Encrypt text\n", program_name);
+    printf("  %s decrypt|-d [encrypted_message]          - Decrypt message\n", program_name);
+    printf("  %s -f <file> <pad_prefix> [-a] [-o <out>]  - Encrypt file\n", program_name);
+    printf("  %s list|-l                                 - List available pads\n", program_name);
+    printf("\nFile Operations:\n");
+    printf("  -f <file> <pad>     - Encrypt file (binary .otp format)\n");
+    printf("  -f <file> <pad> -a  - Encrypt file (ASCII .otp.asc format)\n");
+    printf("  -o <output>         - Specify output filename\n");
+    printf("\nShort flags:\n");
+    printf("  -g generate   -e encrypt   -d decrypt   -l list   -f file\n");
+    printf("\nExamples:\n");
+    printf("  %s -e 1a2b3c \"Hello world\"                  - Encrypt inline text\n", program_name);
+    printf("  %s -f document.pdf 1a2b                     - Encrypt file (binary)\n", program_name);
+    printf("  %s -f document.pdf 1a2b -a                  - Encrypt file (ASCII)\n", program_name);
+    printf("  %s -f document.pdf 1a2b -o secret.otp       - Encrypt with custom output\n", program_name);
+    printf("  %s -d \"-----BEGIN OTP MESSAGE-----...\"      - Decrypt message/file\n", program_name);
+    printf("  %s -d encrypted.otp.asc                     - Decrypt ASCII file\n", program_name);
+    printf("  %s -g 1GB                                   - Generate 1GB pad\n", program_name);
+    printf("  %s -l                                       - List pads\n", program_name);
+    printf("\nSize examples: 1GB, 5TB, 512MB, 2048 (bytes)\n");
+    printf("Pad selection: Full chksum or prefix\n");
+}

src/state.c

@@ -0,0 +1,45 @@
+#include <string.h>
+#include <stdlib.h>
+#include "../include/otp.h"
+
+// Global state variables
+static char current_pads_dir[512] = DEFAULT_PADS_DIR;
+static int is_interactive_mode = 0;
+
+// Terminal dimensions (moved from ui.c to state.c for global access)
+static int terminal_width = 80;  // Default fallback width
+static int terminal_height = 24; // Default fallback height
+
+// Getters and setters for global state
+
+const char* get_current_pads_dir(void) {
+    return current_pads_dir;
+}
+
+void set_current_pads_dir(const char* dir) {
+    if (dir) {
+        strncpy(current_pads_dir, dir, sizeof(current_pads_dir) - 1);
+        current_pads_dir[sizeof(current_pads_dir) - 1] = '\0';
+    }
+}
+
+int get_interactive_mode(void) {
+    return is_interactive_mode;
+}
+
+void set_interactive_mode(int mode) {
+    is_interactive_mode = mode;
+}
+
+int get_terminal_width(void) {
+    return terminal_width;
+}
+
+int get_terminal_height(void) {
+    return terminal_height;
+}
+
+void set_terminal_dimensions(int width, int height) {
+    terminal_width = width;
+    terminal_height = height;
+}

src/trng.c

@@ -0,0 +1,114 @@
+#define _POSIX_C_SOURCE 200809L
+#define _DEFAULT_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/ioctl.h>
+#include <dirent.h>
+#include <time.h>
+#include <ctype.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <math.h>
+#include "../nostr_chacha20.h"
+#include "../include/otp.h"
+
+// Basic TrueRNG entropy collection function
+int collect_truerng_entropy(unsigned char* entropy_buffer, size_t target_bytes, size_t* collected_bytes, int display_progress) {
+    hardware_rng_device_t devices[10];
+    int num_devices_found = 0;
+
+    // Detect available TrueRNG devices
+    if (detect_all_hardware_rng_devices(devices, 10, &num_devices_found) != 0) {
+        if (display_progress) {
+            printf("Error: Failed to detect hardware RNG devices\n");
+        }
+        return 1;
+    }
+
+    if (num_devices_found == 0) {
+        if (display_progress) {
+            printf("No hardware RNG devices found.\n");
+            printf("\nSupported devices:\n");
+            printf("  - TrueRNG/SwiftRNG (PID: %s, VID: %s)\n", TRUERNG_VID, TRUERNG_PID);
+            printf("  - TrueRNGpro/SwiftRNGpro (PID: %s, VID: %s)\n", TRUERNGPRO_VID, TRUERNGPRO_PID);
+            printf("  - TrueRNGproV2/SwiftRNGproV2 (PID: %s, VID: %s)\n", TRUERNGPROV2_VID, TRUERNGPROV2_PID);
+            printf("\nPlease connect a TrueRNG or SwiftRNG device and try again.\n");
+        }
+        return 1;
+    }
+
+    // Use first available device
+    hardware_rng_device_t* selected_device = &devices[0];
+
+    if (display_progress) {
+        printf("Using device: %s\n", selected_device->friendly_name);
+        printf("Collecting %zu bytes of entropy...\n", target_bytes);
+    }
+
+    // Collect entropy from the device
+    int result = collect_truerng_entropy_from_device(selected_device, entropy_buffer, target_bytes, collected_bytes, display_progress);
+
+    if (result != 0) {
+        if (display_progress) {
+            printf("Error: Failed to collect entropy from TrueRNG device\n");
+        }
+        return 1;
+    }
+
+    if (display_progress) {
+        printf("✓ Successfully collected %zu bytes of entropy from TrueRNG device\n", *collected_bytes);
+    }
+
+    return 0;
+}
+
+// Wrapper function to match the header declaration
+// Note: Full implementation moved to otp.c during modularization
+// This is a placeholder that should be implemented when the full streaming
+// functionality is moved to the trng module
+int collect_truerng_entropy_streaming_from_device(const hardware_rng_device_t* device, const char* pad_chksum,
+                                                  size_t total_bytes, int display_progress, int entropy_mode) {
+    // For now, return an error - full implementation needs to be moved from otp.c
+    (void)device; // Suppress unused parameter warning
+    (void)pad_chksum;
+    (void)total_bytes;
+    (void)display_progress;
+    (void)entropy_mode;
+
+    fprintf(stderr, "Error: collect_truerng_entropy_streaming_from_device not yet implemented in modular version\n");
+    return 1; // Error
+}
+
+// Detect all available hardware RNG devices
+int detect_all_hardware_rng_devices(hardware_rng_device_t* devices, int max_devices, int* num_devices_found) {
+    *num_devices_found = 0;
+
+    // For now, return empty list - full implementation would scan /dev for TrueRNG devices
+    // This is a placeholder that should be implemented when the full TRNG functionality
+    // is moved to the trng module
+
+    (void)devices; // Suppress unused parameter warning
+    (void)max_devices;
+
+    return 0; // Success but no devices found
+}
+
+// Collect entropy from a specific TrueRNG device
+int collect_truerng_entropy_from_device(const hardware_rng_device_t* device, unsigned char* entropy_buffer,
+                                       size_t target_bytes, size_t* collected_bytes, int display_progress) {
+    // For now, return an error - full implementation needs to be moved from otp.c
+    (void)device; // Suppress unused parameter warning
+    (void)entropy_buffer;
+    (void)target_bytes;
+    (void)collected_bytes;
+    (void)display_progress;
+
+    fprintf(stderr, "Error: collect_truerng_entropy_from_device not yet implemented in modular version\n");
+    return 1; // Error
+}

src/ui.c

@@ -0,0 +1,503 @@
+#define _POSIX_C_SOURCE 200809L
+#define _DEFAULT_SOURCE
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <stdint.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <sys/statvfs.h>
+#include <sys/ioctl.h>
+#include <dirent.h>
+#include <time.h>
+#include <ctype.h>
+#include <termios.h>
+#include <fcntl.h>
+#include <math.h>
+#include "../include/otp.h"
+
+// Initialize terminal dimensions
+void init_terminal_dimensions(void) {
+    struct winsize ws;
+
+    // Try to get actual terminal size
+    if (ioctl(STDOUT_FILENO, TIOCGWINSZ, &ws) == 0 && ws.ws_col > 0 && ws.ws_row > 0) {
+        set_terminal_dimensions(ws.ws_col, ws.ws_row);
+    }
+    // If ioctl fails, keep the default values (80x24)
+}
+
+// Print centered header with = padding, screen clearing, and optional pause
+void print_centered_header(const char* text, int pause_before_clear) {
+    if (!text) return;
+
+    // Phase 1: Pause if requested
+    if (pause_before_clear) {
+        printf("\nPress Enter to continue...");
+        fflush(stdout);
+
+        // Wait for Enter key
+        int c;
+        while ((c = getchar()) != '\n' && c != EOF) {
+            // Consume any extra characters until newline
+        }
+    }
+
+    // Phase 2: Clear screen using terminal height
+    for (int i = 0; i < get_terminal_height(); i++) {
+        printf("\n");
+    }
+
+    // Phase 3: Display centered header (existing logic)
+    int text_len = strlen(text);
+    int available_width = get_terminal_width();
+
+    // Ensure minimum spacing: at least 1 space on each side
+    int min_required = text_len + 4; // text + " " + text + " " (spaces around text)
+
+    if (available_width < min_required) {
+        // Terminal too narrow - just print the text with minimal formatting
+        printf("=== %s ===\n", text);
+        return;
+    }
+
+    // Calculate padding
+    int total_padding = available_width - text_len - 2; // -2 for spaces around text
+    int left_padding = total_padding / 2;
+    int right_padding = total_padding - left_padding;
+
+    // Print the header
+    for (int i = 0; i < left_padding; i++) {
+        printf("=");
+    }
+    printf(" %s ", text);
+    for (int i = 0; i < right_padding; i++) {
+        printf("=");
+    }
+    printf("\n");
+}
+
+// Interactive mode main loop
+int interactive_mode(void) {
+    char input[10];
+        printf("\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n");
+    while (1) {
+        show_main_menu();
+
+        if (!fgets(input, sizeof(input), stdin)) {
+            printf("Goodbye!\n");
+            break;
+        }
+
+        char choice = toupper(input[0]);
+
+        switch (choice) {
+            case 'T':
+                handle_text_encrypt();
+                break;
+            case 'F':
+                handle_file_encrypt();
+                break;
+            case 'D':
+                handle_decrypt_menu();
+                break;
+            case 'P':
+                handle_pads_menu();
+                break;
+            case 'X':
+            case 'Q':
+                printf("Goodbye!\n");
+                return 0;
+            default:
+                printf("Invalid choice. Please try again.\n");
+                break;
+        }
+    }
+
+    return 0;
+}
+
+void show_main_menu(void) {
+    printf("\n");
+    print_centered_header("Main Menu - OTP v0.3.16", 0);
+    printf("\n");
+
+    printf(" \033[4mT\033[0mext encrypt\n");    //TEXT ENCRYPT
+    printf(" \033[4mF\033[0mile encrypt\n");    //FILE ENCRYPT
+    printf(" \033[4mD\033[0mecrypt\n");         //DECRYPT
+    printf(" \033[4mP\033[0mads\n");            //PADS
+    printf(" E\033[4mx\033[0mit\n");            //EXIT
+    printf("\nSelect option: ");
+}
+
+int handle_generate_menu(void) {
+    printf("\n");
+    print_centered_header("Generate New Pad", 0);
+    printf("Enter pad size (examples: 1GB, 5TB, 512MB, 2048): ");
+
+    char size_input[64];
+    if (!fgets(size_input, sizeof(size_input), stdin)) {
+        printf("Error: Failed to read input\n");
+        return 1;
+    }
+
+    size_input[strcspn(size_input, "\n")] = 0;
+    uint64_t size = parse_size_string(size_input);
+
+    if (size == 0) {
+        printf("Error: Invalid size format\n");
+        return 1;
+    }
+
+    double size_gb = (double)size / (1024.0 * 1024.0 * 1024.0);
+    printf("Generating %.2f GB pad...\n", size_gb);
+    printf("Note: Use 'Add entropy' in Pads menu to enhance randomness after creation.\n");
+
+    return generate_pad(size, 1);
+}
+
+int handle_encrypt_menu(void) {
+    printf("\n");
+    print_centered_header("Encrypt Data", 0);
+
+    printf("Available pads:\n");
+    char* selected = select_pad_interactive("Available pads:", "Select pad (or press Enter to continue)", PAD_FILTER_ALL, 0);
+    int pad_count = 1; // Assume at least 1 pad if function returned
+    if (selected) {
+        free(selected);
+    } else {
+        pad_count = 0;
+    }
+    if (pad_count == 0) {
+        printf("No pads available. Generate a pad first.\n");
+        return 1;
+    }
+
+    // Ask user to choose between text and file encryption
+    printf("\nSelect encryption type:\n");
+    printf(" 1. Text message\n");
+    printf(" 2. File\n");
+    printf("Enter choice (1-2): ");
+
+    char choice_input[10];
+    if (!fgets(choice_input, sizeof(choice_input), stdin)) {
+        printf("Error: Failed to read input\n");
+        return 1;
+    }
+
+    int choice = atoi(choice_input);
+
+    if (choice == 1) {
+        // Text encryption - use unified pad selection
+        char* selected_pad = select_pad_interactive("Select Pad for Text Encryption",
+                                                  "Select pad (by prefix)",
+                                                  PAD_FILTER_ALL, 1);
+        if (!selected_pad) {
+            printf("Text encryption cancelled.\n");
+            return 1;
+        }
+
+        int result = encrypt_text(selected_pad, NULL);  // NULL for interactive mode
+        free(selected_pad);
+        return result;
+    }
+    else if (choice == 2) {
+        // File encryption
+        printf("\nFile selection options:\n");
+        printf(" 1. Type file path directly\n");
+        printf(" 2. Use file manager\n");
+        printf("Enter choice (1-2): ");
+
+        char file_choice[10];
+        char input_file[512];
+
+        if (!fgets(file_choice, sizeof(file_choice), stdin)) {
+            printf("Error: Failed to read input\n");
+            return 1;
+        }
+
+        if (atoi(file_choice) == 2) {
+            // Use file manager
+            if (launch_file_manager(".", input_file, sizeof(input_file)) != 0) {
+                printf("Falling back to manual file path entry.\n");
+                printf("Enter input file path: ");
+                if (!fgets(input_file, sizeof(input_file), stdin)) {
+                    printf("Error: Failed to read input\n");
+                    return 1;
+                }
+                input_file[strcspn(input_file, "\n")] = 0;
+            }
+        } else {
+            // Direct file path input
+            printf("Enter input file path: ");
+            if (!fgets(input_file, sizeof(input_file), stdin)) {
+                printf("Error: Failed to read input\n");
+                return 1;
+            }
+            input_file[strcspn(input_file, "\n")] = 0;
+        }
+
+        // Check if file exists
+        if (access(input_file, R_OK) != 0) {
+            printf("Error: File '%s' not found or cannot be read\n", input_file);
+            return 1;
+        }
+
+        // Use unified pad selection
+        char* selected_pad = select_pad_interactive("Select Pad for File Encryption",
+                                                  "Select pad (by prefix)",
+                                                  PAD_FILTER_ALL, 1);
+        if (!selected_pad) {
+            printf("File encryption cancelled.\n");
+            return 1;
+        }
+
+        // Ask for output format
+        printf("\nSelect output format:\n");
+        printf(" 1. Binary (.otp) - preserves file permissions\n");
+        printf(" 2. ASCII (.otp.asc) - text-safe format\n");
+        printf("Enter choice (1-2): ");
+
+        char format_input[10];
+        if (!fgets(format_input, sizeof(format_input), stdin)) {
+            printf("Error: Failed to read input\n");
+            return 1;
+        }
+
+        int ascii_armor = (atoi(format_input) == 2) ? 1 : 0;
+
+        // Generate default output filename with files directory and use enhanced input function
+        char default_output[1024]; // Increased size to prevent truncation warnings
+        char temp_default[1024];
+
+        // Generate base filename with appropriate extension
+        if (ascii_armor) {
+            snprintf(temp_default, sizeof(temp_default), "%s.otp.asc", input_file);
+        } else {
+            snprintf(temp_default, sizeof(temp_default), "%s.otp", input_file);
+        }
+
+        // Apply files directory default path
+        get_default_file_path(temp_default, default_output, sizeof(default_output));
+
+        char output_file[512];
+        if (get_filename_with_default("Output filename:", default_output, output_file, sizeof(output_file)) != 0) {
+            printf("Error: Failed to read input\n");
+            return 1;
+        }
+
+        const char* output_filename = output_file;
+
+        int result = encrypt_file(selected_pad, input_file, output_filename, ascii_armor);
+        free(selected_pad);
+        return result;
+    }
+    else {
+        printf("Invalid choice. Please enter 1 or 2.\n");
+        return 1;
+    }
+}
+
+int handle_decrypt_menu(void) {
+    printf("\n");
+    print_centered_header("Smart Decrypt", 0);
+    printf("Enter encrypted data (paste ASCII armor), file path, or press Enter to browse files:\n");
+
+    char input_line[MAX_LINE_LENGTH];
+    if (!fgets(input_line, sizeof(input_line), stdin)) {
+        printf("Error: Failed to read input\n");
+        return 1;
+    }
+
+    // Remove newline
+    input_line[strcspn(input_line, "\n")] = 0;
+
+    if (strlen(input_line) == 0) {
+        // Empty input - launch file manager to browse for files
+        char selected_file[512];
+        if (launch_file_manager(get_files_directory(), selected_file, sizeof(selected_file)) != 0) {
+            printf("Error: Could not launch file manager\n");
+            return 1;
+        }
+
+        // Generate smart default output filename with files directory and use enhanced input function
+        char temp_default[512];
+        char default_output[512];
+        strncpy(temp_default, selected_file, sizeof(temp_default) - 1);
+        temp_default[sizeof(temp_default) - 1] = '\0';
+
+        // Remove common encrypted extensions to get a better default
+        if (strstr(temp_default, ".otp.asc")) {
+            // Replace .otp.asc with original extension or no extension
+            char* ext_pos = strstr(temp_default, ".otp.asc");
+            *ext_pos = '\0';
+        } else if (strstr(temp_default, ".otp")) {
+            // Replace .otp with original extension or no extension
+            char* ext_pos = strstr(temp_default, ".otp");
+            *ext_pos = '\0';
+        } else {
+            // No recognized encrypted extension, add .decrypted suffix
+            strncat(temp_default, ".decrypted", sizeof(temp_default) - strlen(temp_default) - 1);
+        }
+
+        // Apply files directory default path
+        get_default_file_path(temp_default, default_output, sizeof(default_output));
+
+        char output_file[512];
+        if (get_filename_with_default("Output filename:", default_output, output_file, sizeof(output_file)) != 0) {
+            printf("Error: Failed to read input\n");
+            return 1;
+        }
+
+        return decrypt_file(selected_file, output_file);
+    }
+    else if (strncmp(input_line, "-----BEGIN OTP MESSAGE-----", 27) == 0) {
+        // Looks like ASCII armor - collect the full message
+        char full_message[MAX_INPUT_SIZE * 4] = {0};
+        strcat(full_message, input_line);
+        strcat(full_message, "\n");
+
+        printf("Continue pasting the message (end with -----END OTP MESSAGE-----):\n");
+
+        char line[MAX_LINE_LENGTH];
+        while (fgets(line, sizeof(line), stdin)) {
+            strncat(full_message, line, sizeof(full_message) - strlen(full_message) - 1);
+            if (strstr(line, "-----END OTP MESSAGE-----")) {
+                break;
+            }
+        }
+
+        return decrypt_text(NULL, full_message);
+    }
+    else {
+        // Check if it looks like a file path
+        if (access(input_line, R_OK) == 0) {
+            // It's a valid file - decrypt it with enhanced input for output filename
+            char temp_default[512];
+            char default_output[512];
+            strncpy(temp_default, input_line, sizeof(temp_default) - 1);
+            temp_default[sizeof(temp_default) - 1] = '\0';
+
+            // Remove common encrypted extensions to get a better default
+            if (strstr(temp_default, ".otp.asc")) {
+                // Replace .otp.asc with original extension or no extension
+                char* ext_pos = strstr(temp_default, ".otp.asc");
+                *ext_pos = '\0';
+            } else if (strstr(temp_default, ".otp")) {
+                // Replace .otp with original extension or no extension
+                char* ext_pos = strstr(temp_default, ".otp");
+                *ext_pos = '\0';
+            } else {
+                // No recognized encrypted extension, add .decrypted suffix
+                strncat(temp_default, ".decrypted", sizeof(temp_default) - strlen(temp_default) - 1);
+            }
+
+            // Apply files directory default path
+            get_default_file_path(temp_default, default_output, sizeof(default_output));
+
+            char output_file[512];
+            if (get_filename_with_default("Output filename:", default_output, output_file, sizeof(output_file)) != 0) {
+                printf("Error: Failed to read input\n");
+                return 1;
+            }
+
+            return decrypt_file(input_line, output_file);
+        } else {
+            printf("Input not recognized as ASCII armor or valid file path.\n");
+            return 1;
+        }
+    }
+}
+
+int handle_text_encrypt(void) {
+    printf("\n");
+    print_centered_header("Text Encrypt", 0);
+
+    // Launch text editor directly
+    char text_buffer[MAX_INPUT_SIZE];
+    if (launch_text_editor(NULL, text_buffer, sizeof(text_buffer)) != 0) {
+        printf("Error: Could not launch text editor\n");
+        return 1;
+    }
+
+    if (strlen(text_buffer) == 0) {
+        printf("No text entered - canceling encryption\n");
+        return 1;
+    }
+
+    // Use unified pad selection
+    char* selected_pad = select_pad_interactive("Select Pad for Text Encryption",
+                                              "Select pad (by prefix)",
+                                              PAD_FILTER_ALL, 1);
+    if (!selected_pad) {
+        printf("Text encryption cancelled.\n");
+        return 1;
+    }
+
+    int result = encrypt_text(selected_pad, text_buffer);
+    free(selected_pad);
+    return result;
+}
+
+int handle_file_encrypt(void) {
+    printf("\n");
+    print_centered_header("File Encrypt", 0);
+
+    // Launch file manager directly
+    char input_file[512];
+    if (launch_file_manager(".", input_file, sizeof(input_file)) != 0) {
+        printf("Error: Could not launch file manager\n");
+        return 1;
+    }
+
+    // Check if file exists
+    if (access(input_file, R_OK) != 0) {
+        printf("Error: File '%s' not found or cannot be read\n", input_file);
+        return 1;
+    }
+
+    // Use unified pad selection
+    char* selected_pad = select_pad_interactive("Select Pad for File Encryption",
+                                              "Select pad (by prefix)",
+                                              PAD_FILTER_ALL, 1);
+    if (!selected_pad) {
+        printf("File encryption cancelled.\n");
+        return 1;
+    }
+
+    // Ask for output format
+    printf("\nSelect output format:\n");
+    printf(" 1. Binary (.otp) - preserves file permissions\n");
+    printf(" 2. ASCII (.otp.asc) - text-safe format\n");
+    printf("Enter choice (1-2): ");
+
+    char format_input[10];
+    if (!fgets(format_input, sizeof(format_input), stdin)) {
+        printf("Error: Failed to read input\n");
+        return 1;
+    }
+
+    int ascii_armor = (atoi(format_input) == 2) ? 1 : 0;
+
+    // Generate default output filename
+    char default_output[1024]; // Increased buffer size to prevent truncation warnings
+    if (ascii_armor) {
+        snprintf(default_output, sizeof(default_output), "%s.otp.asc", input_file);
+    } else {
+        snprintf(default_output, sizeof(default_output), "%s.otp", input_file);
+    }
+
+    // Use enhanced input function for output filename
+    char output_file[512];
+    if (get_filename_with_default("Output filename:", default_output, output_file, sizeof(output_file)) != 0) {
+        printf("Error: Failed to read input\n");
+        return 1;
+    }
+
+    const char* output_filename = output_file;
+
+    int result = encrypt_file(selected_pad, input_file, output_filename, ascii_armor);
+    free(selected_pad);
+    return result;
+}