Version v0.3.32 - Update readme.md some more

Makefile

@@ -11,11 +11,13 @@ OBJS = $(SOURCES:.c=.o)
 $(TARGET): $(OBJS)
 	@mkdir -p build
 	$(CC) $(CFLAGS) -o $(TARGET) $(OBJS) $(LIBS)
+	@rm -f $(OBJS)
 
 # Static linking target
 static: $(OBJS)
 	@mkdir -p build
 	$(CC) $(CFLAGS) -o $(TARGET) $(OBJS) $(LIBS_STATIC)
+	@rm -f $(OBJS)
 
 %.o: %.c
 	$(CC) $(CFLAGS) -c $< -o $@

README.md

@@ -1,6 +1,5 @@
 # OTP Cipher - One Time Pad Implementation
 
-
 ## Introduction
 
 A secure one-time pad (OTP) cipher implementation in C.
@@ -41,8 +40,6 @@ To address this problem, we can use Nostr to share among devices the place in th
 One-time pads can be trivially encrypted and decrypted using pencil and paper, making them accessible even without electronic devices.
 
 
-
-
 ## Features
 
 - **Perfect Security**: Implements true one-time pad encryption with information-theoretic security
@@ -57,106 +54,127 @@ One-time pads can be trivially encrypted and decrypted using pencil and paper, m
 - **Cross-Platform**: Works on Linux and other UNIX-like systems
 
 
-## Building
+## Quick Start
+
+### Download Pre-Built Binaries
+
+**[Download Current Linux x86](https://git.laantungir.net/laantungir/otp/releases/download/v0.3.31/otp-v0.3.31-linux-x86_64)**
+
+**[Download Current Raspberry Pi 64](https://git.laantungir.net/laantungir/otp/releases/download/v0.3.31/otp-v0.3.31-linux-arm64)**
+
+After downloading:
+```bash
+# Make executable and run
+chmod +x otp-v0.3.31-linux-x86_64
+./otp-v0.3.31-linux-x86_64
+```
+
+### First Steps
+
+1. **Generate your first pad:**
+   ```bash
+   ./otp-v0.3.31-linux-x86_64 generate 1GB
+   ```
+
+2. **Encrypt a message:**
+   ```bash
+   ./otp-v0.3.31-linux-x86_64 encrypt
+   # Follow the interactive prompts
+   ```
+
+3. **Decrypt a message:**
+   ```bash
+   ./otp-v0.3.31-linux-x86_64 decrypt
+   # Paste the encrypted message
+   ```
+
+
+
+
+
+
+
+
+## Building from Source
 
 ### Prerequisites
 
 - GCC compiler
-- Git (for version tracking)
 - Make
 
-
-
 ### Build Commands
 
-Use the included build script for automatic versioning:
-
 ```bash
-# Standard build (default)
-./build.sh build
-
-# Static linking build
-./build.sh static
-
-# Clean build artifacts
-./build.sh clean
-
-# Generate version files only
-./build.sh version
-
-# Install to system
-./build.sh install
-
-# Remove from system
-./build.sh uninstall
-
-# Show usage
-./build.sh help
+make            # Build for current architecture
+make static     # Static linking (standalone binary)
+make clean      # Clean build artifacts
+make install    # Install to /usr/local/bin/otp
+make uninstall  # Remove from system
 ```
 
-### Traditional Make
-
-You can also use make directly (without automatic versioning):
+Output: `build/otp-$(ARCH)` (e.g., `build/otp-x86_64`)
 
+After building, run with:
 ```bash
-make            # Standard build
-make static     # Static linking
-make clean      # Clean artifacts
-make install    # Install to /usr/local/bin/
-make uninstall  # Remove from system
+./build/otp-x86_64
 ```
 
 ## Usage
 
 ### Interactive Mode
 ```bash
-./otp
+# If you downloaded the binary:
+./otp-v0.3.31-linux-x86_64
+
+# If you built from source:
+./build/otp-x86_64
 ```
 
 ### Command Line Mode
 ```bash
 # Generate a new pad
-./otp generate 1GB
+./otp-v0.3.31-linux-x86_64 generate 1GB
 
 # Encrypt text (interactive input)
-./otp encrypt <pad_hash_or_prefix>
+./otp-v0.3.31-linux-x86_64 encrypt <pad_hash_or_prefix>
 
 # Decrypt message (interactive input)
-./otp decrypt <pad_hash_or_prefix>
+./otp-v0.3.31-linux-x86_64 decrypt <pad_hash_or_prefix>
 
 # List available pads
-./otp list
+./otp-v0.3.31-linux-x86_64 list
 ```
 
-## Version System Details
+## Version System
+
+### Centralized Version Management
+Version is defined in a single location: `src/main.h`
+```c
+#define OTP_VERSION "v0.3.24"
+```
+
+All code references this constant, ensuring consistency across:
+- Main menu display
+- ASCII armor output
+- Help/usage text
 
 ### Automatic Version Increment
-Every build automatically increments the patch version:
-- v0.1.0 → v0.1.1 → v0.1.2, etc.
-- Creates git tags for each version
-- Embeds detailed build information
+The `build.sh` script automatically:
+1. Increments patch version (v0.3.24 → v0.3.25)
+2. Updates `OTP_VERSION` in `src/main.h`
+3. Creates git commit and tag
+4. Pushes to remote repository
 
 ### Manual Version Control
 For major/minor releases, create tags manually:
 ```bash
 # Feature release (minor bump)
-git tag v0.2.0    # Next build: v0.2.1
+git tag v0.4.0    # Next build: v0.4.1
 
 # Breaking change (major bump)
 git tag v1.0.0    # Next build: v1.0.1
 ```
 
-### Version Information Available
-- Version number (major.minor.patch)
-- Git commit hash and branch
-- Build date and time
-- Full version display with metadata
-
-### Generated Files
-The build system automatically manages Git versioning by incrementing tags.
-
-These files are excluded from git (.gitignore) and regenerated on each build.
-
 ## Security Features
 
 - Uses `/dev/urandom` for cryptographically secure random number generation
@@ -166,28 +184,32 @@ These files are excluded from git (.gitignore) and regenerated on each build.
 - State tracking to prevent pad reuse
 - **Zero external crypto dependencies** - completely self-contained implementation
 
-## File Structure
+## Project Structure
 
 ```
 otp/
-├── build.sh          # Build script with automatic versioning
-├── Makefile         # Traditional make build system
-├── otp.c            # Legacy compatibility and global definitions
-├── README.md        # This file
-├── .gitignore       # Git ignore rules
-├── include/
-│   └── otp.h        # Public API header with all function prototypes
+├── build.sh              # Build script with automatic versioning
+├── Makefile             # Traditional make build system
+├── README.md            # This file
+├── .gitignore           # Git ignore rules
 ├── src/
-│   ├── main.c       # Main application entry point and command line handling
-│   ├── ui.c         # Interactive user interface and menu system
-│   ├── state.c      # Global state management (pads directory, terminal dimensions)
-│   ├── crypto.c     # Core cryptographic operations (XOR, ChaCha20)
-│   ├── pads.c       # Pad management and file operations
-│   ├── entropy.c    # Entropy collection from various sources
-│   ├── trng.c       # Hardware RNG device detection and entropy collection
-│   └── util.c       # Utility functions and helpers
-├── pads/            # OTP pad storage directory (created at runtime)
-└── VERSION          # Plain text version (generated)
+│   ├── main.h           # Main header with all prototypes and OTP_VERSION
+│   ├── main.c           # Application entry point and command line handling
+│   ├── ui.c             # Interactive user interface and menu system
+│   ├── state.c          # Global state management (pads directory, preferences)
+│   ├── crypto.c         # Core cryptographic operations (XOR, base64)
+│   ├── pads.c           # Pad management and file operations
+│   ├── entropy.c        # Entropy collection from various sources
+│   ├── trng.c           # Hardware RNG device detection and collection
+│   ├── util.c           # Utility functions and helpers
+│   ├── nostr_chacha20.c # ChaCha20 implementation for entropy expansion
+│   └── nostr_chacha20.h # ChaCha20 header
+├── build/
+│   ├── otp-x86_64       # Native x86_64 binary (created by build)
+│   └── otp-arm64        # ARM64 binary (created by cross-compilation)
+├── pads/                # OTP pad storage directory (created at runtime)
+├── files/               # Encrypted file storage (created at runtime)
+└── tests/               # Test scripts and utilities
 ```
 
 ## Architecture
@@ -197,13 +219,14 @@ The OTP cipher uses a modular architecture with clean separation of concerns:
 - **main.c**: Application entry point, command line parsing, and mode selection
 - **ui.c**: Interactive user interface, menus, and terminal management
 - **state.c**: Global state management (pads directory, terminal dimensions, preferences)
-- **crypto.c**: Core cryptographic operations (XOR encryption, ChaCha20 entropy mixing)
+- **crypto.c**: Core cryptographic operations (XOR encryption, base64 encoding)
 - **pads.c**: Pad file management, checksums, and state tracking
-- **entropy.c**: Entropy collection from keyboard, dice, and other sources
+- **entropy.c**: Entropy collection from keyboard, dice, files, and hardware RNG
 - **trng.c**: Hardware RNG device detection and entropy collection from USB devices
 - **util.c**: Utility functions, file operations, and helper routines
+- **nostr_chacha20.c**: ChaCha20 stream cipher for entropy expansion
 
-All modules share a common header (`include/otp.h`) that defines the public API and data structures.
+All modules share a common header (`src/main.h`) that defines the public API, data structures, and version constant.
 
 ## Hardware RNG Device Support
 
@@ -405,9 +428,22 @@ No.  ChkSum (first 16 chars) Size         Used         % Used
 
 This project includes automatic versioning system based on the Generic Automatic Version Increment System.
 
+## State Files
+
+Pad state files (`.state`) use a human-readable text format:
+```
+offset=1234567890
+```
+
+This tracks how many bytes of each pad have been used. The format is:
+- **Human-readable**: Can inspect with `cat checksum.state`
+- **Backward compatible**: Automatically reads old binary format
+- **Easy to debug**: Can manually edit if needed
+
 ## Contributing
 
 When contributing:
-1. The version will automatically increment on builds
-2. For major features, consider manually creating minor version tags
-3. Generated version files (`src/version.*`, `VERSION`) should not be committed
+1. The version will automatically increment on builds via `build.sh`
+2. Version is centralized in `src/main.h` as `OTP_VERSION`
+3. For major features, manually create minor/major version tags
+4. Build artifacts in `build/` and object files are auto-cleaned

build.sh

@@ -155,6 +155,42 @@ update_source_version() {
     else
         print_warning "src/main.h not found - skipping version update"
     fi
+    
+    # Update README.md with direct download links
+    if [ -f "README.md" ]; then
+        print_status "Updating README.md with download links for $NEW_VERSION..."
+        
+        # Create the new download section with direct download links
+        local NEW_DOWNLOAD_SECTION="### Download Pre-Built Binaries
+
+**[Download Current Linux x86](https://git.laantungir.net/laantungir/otp/releases/download/${NEW_VERSION}/otp-${NEW_VERSION}-linux-x86_64)**
+
+**[Download Current Raspberry Pi 64](https://git.laantungir.net/laantungir/otp/releases/download/${NEW_VERSION}/otp-${NEW_VERSION}-linux-arm64)**
+
+After downloading:
+\`\`\`bash
+# Make executable and run
+chmod +x otp-${NEW_VERSION}-linux-x86_64
+./otp-${NEW_VERSION}-linux-x86_64
+\`\`\`"
+        
+        # Use awk to replace the section between "### Download Pre-Built Binaries" and "### First Steps"
+        awk -v new_section="$NEW_DOWNLOAD_SECTION" '
+            /^### Download Pre-Built Binaries/ {
+                print new_section
+                skip=1
+                next
+            }
+            /^### First Steps/ {
+                skip=0
+            }
+            !skip
+        ' README.md > README.md.tmp && mv README.md.tmp README.md
+        
+        print_success "Updated README.md with download links for $NEW_VERSION"
+    else
+        print_warning "README.md not found - skipping README update"
+    fi
 }
 
 # Cross-platform build functions

src/main.h

@@ -23,7 +23,7 @@
 #include <ctype.h>
 
 // Version - Updated automatically by build.sh
-#define OTP_VERSION "v0.3.24"
+#define OTP_VERSION "v0.3.31"
 
 // Constants
 #define MAX_INPUT_SIZE 4096