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

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

TODO.md

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

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

src/pads.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);
         
@@ -233,19 +236,41 @@ 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;
     }
 
-    if (fread(offset, sizeof(uint64_t), 1, state_file) != 1) {
+    // 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;
+        }
+        
+        if (fread(offset, sizeof(uint64_t), 1, state_file) != 1) {
+            fclose(state_file);
+            *offset = 0;
+            return 0;
+        }
         fclose(state_file);
-        *offset = 0;
         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;
     }