Version v0.3.26 - Change .state file to plain text instead of binary

.gitignore

@@ -1,9 +1,26 @@
-otp
+# Build artifacts
+build/
+*.o
+src/*.o
+
+# Runtime directories
 pads/
 files/
+
+# Personal files
 Gemini.md
 TropicOfCancer-HenryMiller.txt
 .gitea_token
 true_rng/
 Trash/
-# Auto-generated files (none currently)
+
+# Test binaries
+debug
+test_swiftrng
+test_swiftrng_debug
+test_swiftrng_detailed
+test_truerng
+
+# Temporary files
+*.pad
+*.state

HARDWARE_RNG_STATUS.md

@@ -1,46 +0,0 @@
-
-# Hardware RNG Implementation Status
-
-## Overview
-
-The OTP cipher application now includes comprehensive hardware Random Number Generator (RNG) device support with automatic detection, device identification, and graceful handling of different device types.
-
-## Supported Devices
-
-### ✅ Fully Supported (TrueRNG Family)
-- **TrueRNG Original** (VID: 04d8, PID: f5fe)
-- **TrueRNG Pro** (VID: 04d8, PID: 0aa0)  
-- **TrueRNG Pro V2** (VID: 04d8, PID: ebb5)
-
-These devices work via serial port communication and are fully integrated into the entropy collection system.
-
-### ⚠️ Detected but Not Supported (SwiftRNG Family)
-- **SwiftRNG** (VID: 1fc9, PID: 8111)
-
-SwiftRNG devices are detected and identified but cannot be used via serial port communication. They require the official SwiftRNG API with libusb-1.0 integration.
-
-## Implementation Features
-
-### Device Detection
-- **Automatic scanning** of `/dev/ttyUSB*` and `/dev/ttyACM*` devices
-- **VID/PID identification** via sysfs to distinguish device types
-- **Multi-device support** with interactive selection menus
-- **Real-time status indicators** showing device availability
-
-### Device Communication
-- **Optimized serial port configuration** for each device type
-- **Timeout protection** to prevent hanging on unresponsive devices
-- **Error handling** with clear diagnostic messages
-- **Progress tracking** with speed estimation for large entropy collections
-
-### Integration Points
-- **Pad enhancement** via entropy addition to existing pads
-- **Interactive menus** for device selection when multiple devices are present
-- **Command-line support** for automated workflows
-- **Graceful fallback** to other entropy sources when no hardware RNG is available
-
-## Technical Implementation
-
-### Core Functions
-- `detect_all_hardware_rng_devices()` - Scans and identifies all connected devices
-- `collect_truerng_entropy_from_device()` - Collects entropy from TrueRNG devices

Makefile

@@ -1,29 +1,32 @@
 CC = gcc
-CFLAGS = -Wall -Wextra -std=c99 -Iinclude
+CFLAGS = -Wall -Wextra -std=c99 -Isrc
 LIBS = -lm
 LIBS_STATIC = -static -lm
-TARGET = otp
-SOURCES = $(wildcard src/*.c) nostr_chacha20.c otp.c
+ARCH = $(shell uname -m)
+TARGET = build/otp-$(ARCH)
+SOURCES = $(wildcard src/*.c)
 OBJS = $(SOURCES:.c=.o)
 
 # Default build target
 $(TARGET): $(OBJS)
+	@mkdir -p build
 	$(CC) $(CFLAGS) -o $(TARGET) $(OBJS) $(LIBS)
 
 # Static linking target
 static: $(OBJS)
+	@mkdir -p build
 	$(CC) $(CFLAGS) -o $(TARGET) $(OBJS) $(LIBS_STATIC)
 
 %.o: %.c
 	$(CC) $(CFLAGS) -c $< -o $@
 
 clean:
-	rm -f $(TARGET) $(OBJS) *.pad *.state
+	rm -f $(OBJS) src/*.o build/otp-* *.pad *.state
 
 install:
-	sudo cp $(TARGET) /usr/local/bin/
+	sudo cp $(TARGET) /usr/local/bin/otp
 
 uninstall:
-	sudo rm -f /usr/local/bin/$(TARGET)
+	sudo rm -f /usr/local/bin/otp
 
 .PHONY: clean install uninstall static

TODO.md

@@ -1,3 +0,0 @@
-# TODO
-
-## The pad menu in interactive encrypt mode gives numbers instead of checksum selection

build.sh

@@ -148,18 +148,18 @@ update_source_version() {
     
     print_status "Updating version strings in source code..."
     
-    # Replace hardcoded version strings in otp.c with the current git tag
-    if [ -f "otp.c" ]; then
+    # Replace hardcoded version strings in src/otp.c with the current git tag
+    if [ -f "src/otp.c" ]; then
         # Update main menu version
-        sed -i "s/OTP v[0-9]\+\.[0-9]\+\.[0-9]\+/OTP $NEW_VERSION/g" otp.c
+        sed -i "s/OTP v[0-9]\+\.[0-9]\+\.[0-9]\+/OTP $NEW_VERSION/g" src/otp.c
         # Update ASCII output version
-        sed -i "s/Version: v[0-9]\+\.[0-9]\+\.[0-9]\+/Version: $NEW_VERSION/g" otp.c
+        sed -i "s/Version: v[0-9]\+\.[0-9]\+\.[0-9]\+/Version: $NEW_VERSION/g" src/otp.c
         # Update usage/help text version
-        sed -i "s/Implementation v[0-9]\+\.[0-9]\+\.[0-9]\+/Implementation $NEW_VERSION/g" otp.c
+        sed -i "s/Implementation v[0-9]\+\.[0-9]\+\.[0-9]\+/Implementation $NEW_VERSION/g" src/otp.c
         
-        print_success "Updated version strings in otp.c to $NEW_VERSION"
+        print_success "Updated version strings in src/otp.c to $NEW_VERSION"
     else
-        print_warning "otp.c not found - skipping version string updates"
+        print_warning "src/otp.c not found - skipping version string updates"
     fi
 }
 
@@ -235,16 +235,16 @@ create_gitea_release() {
     if echo "$response" | grep -q '"id"'; then
         print_success "Created release $version"
         
-        # Upload binaries with descriptive names
-        upload_release_asset "$api_url" "$token" "$version" "otp-x86_64" "otp-${version}-linux-x86_64"
-        upload_release_asset "$api_url" "$token" "$version" "otp-arm64" "otp-${version}-linux-arm64"
+        # Upload binaries with descriptive names from build directory
+        upload_release_asset "$api_url" "$token" "$version" "build/otp-x86_64" "otp-${version}-linux-x86_64"
+        upload_release_asset "$api_url" "$token" "$version" "build/otp-arm64" "otp-${version}-linux-arm64"
     else
         print_warning "Release may already exist or creation failed"
         print_status "Response: $response"
         
         # Try to upload to existing release anyway
-        upload_release_asset "$api_url" "$token" "$version" "otp-x86_64" "otp-${version}-linux-x86_64"
-        upload_release_asset "$api_url" "$token" "$version" "otp-arm64" "otp-${version}-linux-arm64"
+        upload_release_asset "$api_url" "$token" "$version" "build/otp-x86_64" "otp-${version}-linux-x86_64"
+        upload_release_asset "$api_url" "$token" "$version" "build/otp-arm64" "otp-${version}-linux-arm64"
     fi
 }
 
@@ -259,9 +259,8 @@ build_project() {
         
         # Build x86_64 only
         print_status "Building OTP project for x86_64..."
-        make CC=gcc
+        make CC=gcc ARCH=x86_64
         if [ $? -eq 0 ]; then
-            mv otp otp-x86_64
             print_success "x86_64 build completed successfully"
         else
             print_error "x86_64 build failed"
@@ -270,10 +269,8 @@ build_project() {
     else
         # Build both architectures
         print_status "Building OTP project for x86_64..."
-        make clean
-        make CC=gcc
+        make CC=gcc ARCH=x86_64
         if [ $? -eq 0 ]; then
-            mv otp otp-x86_64
             print_success "x86_64 build completed successfully"
         else
             print_error "x86_64 build failed"
@@ -281,10 +278,10 @@ build_project() {
         fi
         
         print_status "Building OTP project for ARM64/AArch64..."
-        make clean
-        make CC=aarch64-linux-gnu-gcc
+        # Clean only object files, not the x86_64 binary
+        rm -f src/*.o
+        make CC=aarch64-linux-gnu-gcc ARCH=arm64
         if [ $? -eq 0 ]; then
-            mv otp otp-arm64
             print_success "ARM64/AArch64 build completed successfully"
         else
             print_error "ARM64/AArch64 build failed"
@@ -306,8 +303,8 @@ build_project() {
 clean_project() {
     print_status "Cleaning build artifacts..."
     make clean
-    # Remove cross-compiled binaries
-    rm -f otp-x86_64 otp-arm64
+    # Remove build directory
+    rm -rf build
     print_success "Clean completed"
 }
 
@@ -362,8 +359,8 @@ case "$COMMAND" in
         echo "  uninstall - Remove from system"
         echo ""
         echo "Build Output:"
-        echo "  otp-x86_64  - Native x86_64 binary"
-        echo "  otp-arm64   - ARM64/AArch64 binary for Raspberry Pi (if cross-compiler available)"
+        echo "  build/otp-x86_64  - Native x86_64 binary"
+        echo "  build/otp-arm64   - ARM64/AArch64 binary for Raspberry Pi (if cross-compiler available)"
         echo ""
         echo "Gitea Integration:"
         echo "  - Automatically creates releases with binaries if ~/.gitea_token exists"

debug.c

@@ -1 +0,0 @@
-int main() { printf("Testing direct filename: %d\n", strncmp("97d9d82b5414a9439102f3811fb90ab1d6368a00d33229a18b306476f9d04f82.pad", "97", 2)); return 0; }

manual_test.sh

@@ -1,22 +0,0 @@
-#!/bin/bash
-
-echo "Manual OTP Test"
-echo "==============="
-
-# Generate a test pad
-echo "Generating test pad..."
-./otp generate demo 1
-echo
-
-# Create a test message file for encryption
-echo "Creating test message..."
-echo "This is a secret message for testing OTP encryption!" > test_message.txt
-
-# Test encryption interactively
-echo "Testing encryption (will prompt for input):"
-echo "Please enter: This is a secret message for testing OTP encryption!"
-./otp encrypt demo
-
-echo
-echo "Files created:"
-ls -la demo.*

otp

@@ -0,0 +1 @@
+./build/otp-x86_64

otp.h

@@ -1,329 +0,0 @@
-#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
-
-////////////////////////////////////////////////////////////////////////////////
-//      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);
-
-////////////////////////////////////////////////////////////////////////////////
-//      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

src/crypto.c

@@ -5,7 +5,7 @@
 #include <stdio.h>
 #include <time.h>
 #include <unistd.h>
-#include "../include/otp.h"
+#include "otp.h"
 
 #define PROGRESS_UPDATE_INTERVAL (64 * 1024 * 1024)  // 64MB intervals
 

src/entropy.c

@@ -15,8 +15,8 @@
 #include <termios.h>
 #include <fcntl.h>
 #include <math.h>
-#include "../nostr_chacha20.h"
-#include "../include/otp.h"
+#include "nostr_chacha20.h"
+#include "otp.h"
 
 
 // In-place pad entropy addition using Chacha20 or direct XOR

src/main.c

@@ -15,7 +15,7 @@
 #include <termios.h>
 #include <fcntl.h>
 #include <math.h>
-#include "../include/otp.h"
+#include "otp.h"
 
 int main(int argc, char* argv[]) {
     // Initialize terminal dimensions first

src/pads.c

@@ -16,7 +16,7 @@
 #include <fcntl.h>
 #include <math.h>
 #include <errno.h>
-#include "../include/otp.h"
+#include "otp.h"
 
 
 // Extracted pad management functions from otp.c
@@ -89,7 +89,10 @@ int generate_pad(uint64_t size_bytes, int display_progress) {
     const char* pads_dir = get_current_pads_dir();
     struct statvfs stat;
     if (statvfs(pads_dir, &stat) == 0) {
-        uint64_t available_bytes = stat.f_bavail * stat.f_frsize;
+        // Use f_bfree (total free blocks) instead of f_bavail (available to non-root)
+        // This gives the actual free space on the filesystem, which is more accurate
+        // for removable media and user-owned directories
+        uint64_t available_bytes = stat.f_bfree * stat.f_frsize;
         double available_gb = (double)available_bytes / (1024.0 * 1024.0 * 1024.0);
         double required_gb = (double)size_bytes / (1024.0 * 1024.0 * 1024.0);
         
@@ -233,7 +236,25 @@ int read_state_offset(const char* pad_chksum, uint64_t* offset) {
     const char* pads_dir = get_current_pads_dir();
     snprintf(state_filename, sizeof(state_filename), "%s/%s.state", pads_dir, pad_chksum);
 
-    FILE* state_file = fopen(state_filename, "rb");
+    FILE* state_file = fopen(state_filename, "r");
+    if (!state_file) {
+        *offset = 0;
+        return 0;
+    }
+
+    // Try to read as text format first (new format)
+    char line[128];
+    if (fgets(line, sizeof(line), state_file)) {
+        // Check if it's text format (starts with "offset=")
+        if (strncmp(line, "offset=", 7) == 0) {
+            *offset = strtoull(line + 7, NULL, 10);
+            fclose(state_file);
+            return 0;
+        }
+        
+        // Not text format, try binary format (legacy)
+        fclose(state_file);
+        state_file = fopen(state_filename, "rb");
         if (!state_file) {
             *offset = 0;
             return 0;
@@ -244,8 +265,12 @@ int read_state_offset(const char* pad_chksum, uint64_t* offset) {
             *offset = 0;
             return 0;
         }
+        fclose(state_file);
+        return 0;
+    }
 
     fclose(state_file);
+    *offset = 0;
     return 0;
 }
 
@@ -254,12 +279,13 @@ int write_state_offset(const char* pad_chksum, uint64_t offset) {
     const char* pads_dir = get_current_pads_dir();
     snprintf(state_filename, sizeof(state_filename), "%s/%s.state", pads_dir, pad_chksum);
 
-    FILE* state_file = fopen(state_filename, "wb");
+    FILE* state_file = fopen(state_filename, "w");
     if (!state_file) {
         return 1;
     }
 
-    if (fwrite(&offset, sizeof(uint64_t), 1, state_file) != 1) {
+    // Write in text format for human readability
+    if (fprintf(state_file, "offset=%lu\n", offset) < 0) {
         fclose(state_file);
         return 1;
     }

src/state.c

@@ -1,6 +1,6 @@
 #include <string.h>
 #include <stdlib.h>
-#include "../include/otp.h"
+#include "otp.h"
 
 // Global state variables
 static char current_pads_dir[512] = DEFAULT_PADS_DIR;

src/trng.c

@@ -16,8 +16,8 @@
 #include <fcntl.h>
 #include <math.h>
 #include <errno.h>
-#include "../nostr_chacha20.h"
-#include "../include/otp.h"
+#include "nostr_chacha20.h"
+#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) {

src/ui.c

@@ -15,7 +15,7 @@
 #include <termios.h>
 #include <fcntl.h>
 #include <math.h>
-#include "../include/otp.h"
+#include "otp.h"
 
 // Initialize terminal dimensions
 void init_terminal_dimensions(void) {

src/util.c

@@ -15,7 +15,7 @@
 #include <termios.h>
 #include <fcntl.h>
 #include <math.h>
-#include "../include/otp.h"
+#include "otp.h"
 
 // Global variables for preferences
 static char default_pad_path[1024] = "";