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# Generic Automatic Version Increment System for Any Repository
Here's a generalized implementation guide for adding automatic versioning to any project:
## Core Concept
**Automatic patch version increment with each build** - Every build automatically increments the patch version: v0.1.0 → v0.1.1 → v0.1.2, etc.
## Implementation Steps
### 1. Add Version Increment Function to Build Script
Add this function to your build script (bash example):
```bash
# Function to automatically increment version
increment_version() {
echo "[INFO] Incrementing version..."
# Check if we're in a git repository
if ! git rev-parse --git-dir > /dev/null 2>&1; then
echo "[WARNING] Not in a git repository - skipping version increment"
return 0
fi
# Get the highest version tag (not chronologically latest)
LATEST_TAG=$(git tag -l 'v*.*.*' | sort -V | tail -n 1 || echo "v0.1.0")
if [[ -z "$LATEST_TAG" ]]; then
LATEST_TAG="v0.1.0"
fi
# Extract version components (remove 'v' prefix)
VERSION=${LATEST_TAG#v}
# Parse major.minor.patch using regex
if [[ $VERSION =~ ^([0-9]+)\.([0-9]+)\.([0-9]+)$ ]]; then
MAJOR=${BASH_REMATCH[1]}
MINOR=${BASH_REMATCH[2]}
PATCH=${BASH_REMATCH[3]}
else
echo "[ERROR] Invalid version format in tag: $LATEST_TAG"
echo "[ERROR] Expected format: v0.1.0"
return 1
fi
# Increment patch version
NEW_PATCH=$((PATCH + 1))
NEW_VERSION="v${MAJOR}.${MINOR}.${NEW_PATCH}"
echo "[INFO] Current version: $LATEST_TAG"
echo "[INFO] New version: $NEW_VERSION"
# Create new git tag
if git tag "$NEW_VERSION" 2>/dev/null; then
echo "[SUCCESS] Created new version tag: $NEW_VERSION"
else
echo "[WARNING] Tag $NEW_VERSION already exists - using existing version"
NEW_VERSION=$LATEST_TAG
fi
# Update VERSION file for compatibility
echo "${NEW_VERSION#v}" > VERSION
echo "[SUCCESS] Updated VERSION file to ${NEW_VERSION#v}"
}
```
### 2. Generate Version Header Files (For C/C++ Projects)
Add this to the increment_version function:
```bash
# Generate version.h header file (adjust path as needed)
cat > src/version.h << EOF
/*
* Auto-Generated Version Header
* DO NOT EDIT THIS FILE MANUALLY - Generated by build script
*/
#ifndef VERSION_H
#define VERSION_H
#define VERSION_MAJOR ${MAJOR}
#define VERSION_MINOR ${MINOR}
#define VERSION_PATCH ${NEW_PATCH}
#define VERSION_STRING "${MAJOR}.${MINOR}.${NEW_PATCH}"
#define VERSION_TAG "${NEW_VERSION}"
/* Build information */
#define BUILD_DATE "$(date +%Y-%m-%d)"
#define BUILD_TIME "$(date +%H:%M:%S)"
#define BUILD_TIMESTAMP "$(date '+%Y-%m-%d %H:%M:%S')"
/* Git information */
#define GIT_HASH "$(git rev-parse --short HEAD 2>/dev/null || echo 'unknown')"
#define GIT_BRANCH "$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo 'unknown')"
/* Display versions */
#define VERSION_DISPLAY "${NEW_VERSION}"
#define VERSION_FULL_DISPLAY "${NEW_VERSION} ($(date '+%Y-%m-%d %H:%M:%S'), $(git rev-parse --short HEAD 2>/dev/null || echo 'unknown'))"
/* Version API functions */
const char* get_version(void);
const char* get_version_full(void);
const char* get_build_info(void);
#endif /* VERSION_H */
EOF
# Generate version.c implementation file
cat > src/version.c << EOF
/*
* Auto-Generated Version Implementation
* DO NOT EDIT THIS FILE MANUALLY - Generated by build script
*/
#include "version.h"
const char* get_version(void) {
return VERSION_TAG;
}
const char* get_version_full(void) {
return VERSION_FULL_DISPLAY;
}
const char* get_build_info(void) {
return "Built on " BUILD_DATE " at " BUILD_TIME " from commit " GIT_HASH " on branch " GIT_BRANCH;
}
EOF
```
### 3. Generate Version File for Other Languages
**Python (`src/__version__.py`):**
```bash
cat > src/__version__.py << EOF
"""Auto-generated version file"""
__version__ = "${MAJOR}.${MINOR}.${NEW_PATCH}"
__version_tag__ = "${NEW_VERSION}"
__build_date__ = "$(date +%Y-%m-%d)"
__build_time__ = "$(date +%H:%M:%S)"
__git_hash__ = "$(git rev-parse --short HEAD 2>/dev/null || echo 'unknown')"
__git_branch__ = "$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo 'unknown')"
EOF
```
**JavaScript/Node.js (update `package.json`):**
```bash
# Update package.json version field
if [ -f package.json ]; then
sed -i "s/\"version\": \".*\"/\"version\": \"${MAJOR}.${MINOR}.${NEW_PATCH}\"/" package.json
fi
```
**Rust (update `Cargo.toml`):**
```bash
if [ -f Cargo.toml ]; then
sed -i "s/^version = \".*\"/version = \"${MAJOR}.${MINOR}.${NEW_PATCH}\"/" Cargo.toml
fi
```
**Go (generate `version.go`):**
```bash
cat > version.go << EOF
// Auto-generated version file
package main
const (
VersionMajor = ${MAJOR}
VersionMinor = ${MINOR}
VersionPatch = ${NEW_PATCH}
VersionString = "${MAJOR}.${MINOR}.${NEW_PATCH}"
VersionTag = "${NEW_VERSION}"
BuildDate = "$(date +%Y-%m-%d)"
BuildTime = "$(date +%H:%M:%S)"
GitHash = "$(git rev-parse --short HEAD 2>/dev/null || echo 'unknown')"
GitBranch = "$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo 'unknown')"
)
EOF
```
**Java (generate `Version.java`):**
```bash
cat > src/main/java/Version.java << EOF
// Auto-generated version class
public class Version {
public static final int VERSION_MAJOR = ${MAJOR};
public static final int VERSION_MINOR = ${MINOR};
public static final int VERSION_PATCH = ${NEW_PATCH};
public static final String VERSION_STRING = "${MAJOR}.${MINOR}.${NEW_PATCH}";
public static final String VERSION_TAG = "${NEW_VERSION}";
public static final String BUILD_DATE = "$(date +%Y-%m-%d)";
public static final String BUILD_TIME = "$(date +%H:%M:%S)";
public static final String GIT_HASH = "$(git rev-parse --short HEAD 2>/dev/null || echo 'unknown')";
public static final String GIT_BRANCH = "$(git rev-parse --abbrev-ref HEAD 2>/dev/null || echo 'unknown')";
}
EOF
```
### 4. Integrate into Build Targets
Call `increment_version` before your main build commands:
```bash
build_library() {
increment_version
echo "[INFO] Building library..."
# Your actual build commands here
make clean && make
}
build_release() {
increment_version
echo "[INFO] Building release..."
# Your release build commands
}
build_package() {
increment_version
echo "[INFO] Building package..."
# Your packaging commands
}
```
### 5. Update .gitignore
Add generated version files to `.gitignore`:
```gitignore
# Auto-generated version files
src/version.h
src/version.c
src/__version__.py
version.go
src/main/java/Version.java
VERSION
```
### 6. Update Build System Files
**For Makefile projects:**
```makefile
# Add version.c to your source files
SOURCES = main.c utils.c version.c
```
**For CMake projects:**
```cmake
# Add version files to your target
target_sources(your_target PRIVATE src/version.c)
```
**For Node.js projects:**
```json
{
"scripts": {
"build": "node build.js && increment_version",
"version": "node -e \"console.log(require('./package.json').version)\""
}
}
```
### 7. Create Initial Version Tag
```bash
# Start with initial version
git tag v0.1.0
```
## Usage Pattern
```bash
./build.sh # v0.1.0 → v0.1.1
./build.sh release # v0.1.1 → v0.1.2
./build.sh package # v0.1.2 → v0.1.3
```
## Manual Version Control
### Major/Minor Version Bumps
```bash
# For feature releases (minor bump)
git tag v0.2.0 # Next build: v0.2.1
# For breaking changes (major bump)
git tag v1.0.0 # Next build: v1.0.1
```
### Version Reset
```bash
# Delete incorrect tags (if needed)
git tag -d v0.2.1
git push origin --delete v0.2.1 # If pushed to remote
# Create correct base version
git tag v0.2.0
# Next build will create v0.2.1
```
## Example Build Script Template
```bash
#!/bin/bash
set -e
# Colors for output
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
BLUE='\033[0;34m'
NC='\033[0m'
print_status() { echo -e "${BLUE}[INFO]${NC} $1"; }
print_success() { echo -e "${GREEN}[SUCCESS]${NC} $1"; }
print_warning() { echo -e "${YELLOW}[WARNING]${NC} $1"; }
print_error() { echo -e "${RED}[ERROR]${NC} $1"; }
# Insert increment_version function here
case "${1:-build}" in
build)
increment_version
print_status "Building project..."
# Your build commands
;;
clean)
print_status "Cleaning build artifacts..."
# Your clean commands
;;
test)
print_status "Running tests..."
# Your test commands (no version increment)
;;
release)
increment_version
print_status "Building release..."
# Your release commands
;;
*)
echo "Usage: $0 {build|clean|test|release}"
exit 1
;;
esac
```
## Benefits
1. **Zero maintenance** - No manual version editing
2. **Build traceability** - Every build has unique version + metadata
3. **Git integration** - Automatic version tags
4. **Language agnostic** - Adapt generation for any language
5. **CI/CD friendly** - Works in automated environments
6. **Rollback friendly** - Easy to revert to previous versions
## Troubleshooting
### Version Not Incrementing
- Ensure you're in a git repository
- Check that git tags exist: `git tag --list`
- Verify tag format matches `v*.*.*` pattern
### Tag Already Exists
If a tag already exists, the build continues with existing version:
```
[WARNING] Tag v0.2.1 already exists - using existing version
```
### Missing Git Information
If git is unavailable, version files show "unknown" for git hash and branch.

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CC = gcc
CFLAGS = -Wall -Wextra -std=c99
LIBS = -lssl -lcrypto
TARGET = otp
SOURCE = otp.c
$(TARGET): $(SOURCE)
$(CC) $(CFLAGS) -o $(TARGET) $(SOURCE) $(LIBS)
clean:
rm -f $(TARGET) *.pad *.state
install:
sudo cp $(TARGET) /usr/local/bin/
uninstall:
sudo rm -f /usr/local/bin/$(TARGET)
.PHONY: clean install uninstall

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# OTP Cipher v2.0 - Enhanced One Time Pad Implementation
A comprehensive and user-friendly One Time Pad (OTP) cryptographic system implemented in C for Linux, supporting massive pad sizes up to 10TB+ with both interactive and command-line interfaces.
## New in Version 2.0 🚀
- **Interactive Menu System** - User-friendly menu-driven interface
- **Smart Size Parsing** - Supports K/KB/M/MB/G/GB/T/TB units
- **Partial Hash Matching** - Use hash prefixes or pad numbers for selection
- **Progress Indicators** - Real-time progress for large pad generation
- **10TB+ Support** - Generate massive pads for external drives
- **Enhanced Pad Management** - List, info, and usage statistics
## Features
- **Cryptographically secure** random pad generation using `/dev/urandom`
- **ASCII armor format** similar to PGP for encrypted messages
- **Integrity verification** using SHA-256 hashing of pad files
- **State management** to prevent pad reuse
- **Interactive text encryption/decryption**
- **Hash-based file naming** for content verification
- **Read-only pad protection** prevents accidental corruption
## Dependencies
- OpenSSL development libraries (`libssl-dev` on Ubuntu/Debian)
- GCC compiler
### Install dependencies on Ubuntu/Debian:
```bash
sudo apt update
sudo apt install libssl-dev build-essential
```
## Building
```bash
make
```
This will create the `otp` executable.
## Usage Modes
### Interactive Mode (Recommended)
Simply run the program without arguments:
```bash
./otp
```
This launches a menu-driven interface:
```
=== OTP Cipher Interactive Mode ===
Version: OTP-CIPHER 2.0
=== Main Menu ===
1. Generate new pad
2. Encrypt message
3. Decrypt message
4. List available pads
5. Show pad information
6. Exit
```
### Command Line Mode
For automation and scripting:
```bash
./otp generate <size> # Generate new pad
./otp encrypt <pad_hash_prefix> # Encrypt text
./otp decrypt <pad_hash_prefix> # Decrypt message
./otp list # List available pads
```
## Smart Size Parsing
The system intelligently parses size specifications:
```bash
./otp generate 1024 # 1024 bytes
./otp generate 5MB # 5 megabytes
./otp generate 2GB # 2 gigabytes
./otp generate 10TB # 10 terabytes
./otp generate 1.5GB # 1.5 gigabytes (decimal supported)
```
**Supported units:** K, KB, M, MB, G, GB, T, TB (case insensitive)
## Pad Selection
Multiple convenient ways to select pads:
1. **Full hash**: `./otp encrypt a1b2c3d4e5f6789012345678901234567890abcdef...`
2. **Hash prefix**: `./otp encrypt a1b2c3d4`
3. **Pad number**: `./otp encrypt 1` (from list output)
## Example Workflows
### Basic Usage
```bash
# Generate a 1GB pad
./otp generate 1GB
Generated pad: a1b2c3d4e5f6789...123456.pad (1.00 GB)
Pad hash: a1b2c3d4e5f6789012345678901234567890abcdef1234567890abcdef123456
# List available pads
./otp list
Available pads:
No. Hash (first 16 chars) Size Used
--- ------------------- ---------- ----------
1 a1b2c3d4e5f67890 1.00GB 0.0MB
# Encrypt using hash prefix
./otp encrypt a1b2
Enter text to encrypt: Secret message
-----BEGIN OTP MESSAGE-----
Version: OTP-CIPHER 2.0
Pad-Hash: a1b2c3d4e5f6789012345678901234567890abcdef1234567890abcdef123456
Pad-Offset: 0
U2VjcmV0IG1lc3NhZ2U=
-----END OTP MESSAGE-----
```
### Large Scale Usage
```bash
# Generate a 5TB pad for external drive
./otp generate 5TB
Progress: 100.0% (85.2 MB/s, ETA: 0s)
Generated pad: f9e8d7c6b5a4932...654321.pad (5.00 TB)
# Use pad number for quick selection
./otp encrypt 1
Enter text to encrypt: Classified information
```
### Interactive Mode Workflow
```bash
./otp
# Select option 1 to generate
# Enter size: 10GB
# Select option 2 to encrypt
# Choose pad from list
# Enter your message
```
## Security Features
### Perfect Forward Secrecy
Each message uses a unique portion of the pad that is never reused, ensuring perfect forward secrecy.
### Content-Based Integrity
- **SHA-256 file naming**: Pad files named by their hash ensure content verification
- **Integrity checking**: Embedded hashes detect pad corruption/tampering
- **Read-only protection**: Pad files automatically set to read-only after creation
### ASCII Armor Format
Messages use a PGP-like ASCII armor format:
```
-----BEGIN OTP MESSAGE-----
Version: OTP-CIPHER 2.0
Pad-Hash: a1b2c3d4e5f6789012345678901234567890abcdef1234567890abcdef123456
Pad-Offset: 0
U2VjcmV0IG1lc3NhZ2U=
-----END OTP MESSAGE-----
```
### State Management
- **Automatic tracking**: Prevents pad reuse through state files
- **Portable state**: State stored separately from immutable pad data
- **Usage statistics**: Track pad consumption and remaining capacity
## File Structure
**Source Files:**
- `otp.c` - Complete implementation (850+ lines)
- `Makefile` - Build configuration
- `README.md` - This documentation
**Generated Files:**
- `otp` - Compiled executable
- `<hash>.pad` - Pad files (read-only, hash-named)
- `<hash>.state` - State files (writable, tracks usage)
## Advanced Features
### Progress Indicators
For large pads, see real-time generation progress:
```
Generating pad...
Progress: 45.2% (78.5 MB/s, ETA: 125s)
```
### Pad Information
Detailed statistics for each pad:
```bash
./otp list
No. Hash (first 16 chars) Size Used
--- ------------------- ---------- ----------
1 a1b2c3d4e5f67890 5.00TB 2.1GB
2 f9e8d7c6b5a49321 1.00GB 0.5GB
```
### Multiple Pad Management
- List all available pads
- Show detailed information per pad
- Track usage across multiple pads
- Quick selection by number or prefix
## Performance
### Size Limits
- **Theoretical maximum**: 18 exabytes (uint64_t limit)
- **Practical maximum**: Limited by available disk space
- **Tested up to**: 10TB+ on modern systems
- **Generation speed**: ~80-120 MB/s (system dependent)
### Memory Efficiency
- **Streaming operation**: Constant memory usage regardless of pad size
- **64KB buffers**: Efficient I/O without excessive memory consumption
- **Large file support**: Handles multi-terabyte pads efficiently
## Security Notes
⚠️ **Critical Security Requirements:**
1. **Never reuse pad data** - Automatic prevention through state tracking
2. **Secure pad distribution** - Use secure channels for pad sharing
3. **Physical security** - Protect pad files like encryption keys
4. **Verify integrity** - Always check pad hash verification during decryption
5. **Secure systems** - Generate pads on trusted systems with good entropy
## Installation
### Local Installation
```bash
make install # Install to /usr/local/bin
make uninstall # Remove from system
```
### Clean Up
```bash
make clean # Remove compiled files and generated pads
```
## Technical Specifications
- **Entropy source**: `/dev/urandom` (cryptographically secure)
- **Hash algorithm**: SHA-256 for integrity verification
- **Encoding**: Base64 for ciphertext representation
- **File format**: ASCII armor with embedded metadata
- **Architecture**: Single C file, ~850 lines
- **Dependencies**: OpenSSL libcrypto
- **Platform**: Linux (easily portable)
## Theory
A One Time Pad is theoretically unbreakable when implemented correctly with:
- **Perfect randomness**: Cryptographically secure entropy
- **Key length**: Equal to or greater than message length
- **Single use**: Each pad portion used exactly once
- **Secure distribution**: Pads shared through secure channels
This implementation satisfies all requirements for perfect cryptographic security while providing modern usability features for practical deployment.
## Version History
- **v2.0**: Interactive mode, smart parsing, 10TB+ support, enhanced UX
- **v1.0**: Basic command-line implementation with hash-based naming

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#!/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.*

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#!/bin/bash
echo "Testing OTP Cipher Implementation"
echo "================================="
# Test 1: Generate a pad
echo "Test 1: Generating pad..."
./otp generate test 2
echo
# Test 2: Check if files were created
echo "Test 2: Checking generated files..."
ls -la test.pad test.state
echo
# Test 3: Test encryption
echo "Test 3: Testing encryption..."
echo "Secret Message" | ./otp encrypt test > encrypted_output.txt
cat encrypted_output.txt
echo
# Test 4: Test decryption
echo "Test 4: Testing decryption..."
cat encrypted_output.txt | ./otp decrypt test
echo
echo "Tests completed!"