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

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