# SSeed

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**Secure, offline BIP39/SLIP39 cryptocurrency seed management with mathematical verification**

---

## ✨ Features

- 🔐 **Generate secure 24-word BIP-39 mnemonics** with cryptographically secure entropy
- 🌱 **Generate master seeds from mnemonics** using PBKDF2-HMAC-SHA512 per BIP-39 specification
- 🔄 **Split secrets using SLIP-39** with flexible group/threshold configurations
- 🔧 **Reconstruct mnemonics from shards** with integrity validation
- 🚫 **100% offline operation** - zero network calls, air-gapped security
- ⚡ **Lightning fast** - sub-millisecond operations, <100MB memory usage
- 🛡️ **Secure memory handling** - automatic cleanup of sensitive data
- 🧪 **Mathematical verification** - property-based testing with Hypothesis
- 🎯 **Simple CLI interface** - intuitive commands, version info, scriptable automation
- 📦 **Zero dependencies** - self-contained, easy deployment
- 🌍 **Cross-platform** - macOS, Linux, Windows compatibility

## 🚀 Quick Install

```bash
pip install sseed
```

## 📖 Quick Start

### Generate → Shard → Restore Demo

```bash
# Generate a secure mnemonic
$ sseed gen
abandon ability able about above absent absorb abstract absurd abuse access accident

# Split into 3-of-5 threshold shards  
$ sseed gen | sseed shard -g 3-of-5
# Group 1 of 1 - Share 1 of 5: academic acid acrobat...
# Group 1 of 1 - Share 2 of 5: academic acid beard...
# Group 1 of 1 - Share 3 of 5: academic acid ceramic...
# Group 1 of 1 - Share 4 of 5: academic acid decision...
# Group 1 of 1 - Share 5 of 5: academic acid echo...

# Restore from any 3 shards
$ sseed restore shard1.txt shard2.txt shard3.txt
abandon ability able about above absent absorb abstract absurd abuse access accident
```

### System Information

```bash
# Show comprehensive version information
$ sseed version
🔐 SSeed v1.4.0
========================================

📋 Core Information:
   Version: 1.4.0
   Python:  3.12.2 (CPython)

🖥️  System Information:
   OS:           Darwin 23.6.0
   Architecture: arm64 (64bit)

📦 Dependencies:
   ✅ bip-utils: 2.9.3
   ✅ slip39: 13.1.0

# JSON format for automation
$ sseed version --json
{"sseed": "1.4.0", "python": "3.12.2", "platform": {...}}
```

### Advanced Usage

```bash
# Generate to file with timestamp
sseed gen -o "backup-$(date +%Y%m%d).txt"

# Generate master seed from mnemonic
sseed seed -i mnemonic.txt --hex

# Generate master seed with passphrase
sseed seed -i mnemonic.txt -p "my_passphrase" --hex

# Multi-group configuration (enterprise setup)
sseed shard -g "2:(2-of-3,3-of-5)" -i seed.txt --separate -o shards/

# Restore with passphrase protection
sseed restore -p "my-secure-passphrase" shard*.txt
```

## 📚 API Documentation

For programmatic integration, SSeed provides a clean Python API:

```python
from sseed import generate_mnemonic, create_shards, restore_mnemonic

# Generate secure mnemonic
mnemonic = generate_mnemonic()

# Create threshold shards
shards = create_shards(mnemonic, groups="3-of-5")

# Restore from shards
restored = restore_mnemonic(shards[:3])
```

**[📖 Full API Documentation →](docs/api.md)**

## 🛠️ Installation Options

### From PyPI (Recommended)
```bash
pip install sseed
```

### From Source
```bash
git clone https://github.com/ethene/sseed.git
cd sseed
pip install .
```

### Development Setup
```bash
# Install in development mode
pip install -e ".[dev]"

# Run comprehensive test suite
pytest  # 290+ tests with 87.8% coverage

# Version management (follows PEP 440)
make bump-patch          # 1.0.1 → 1.0.2
make bump-minor          # 1.0.1 → 1.1.0
make bump-major          # 1.0.1 → 2.0.0
make bump-patch DRY_RUN=1  # Preview changes

# Quality assurance
make test               # Run tests with coverage
make check             # Code quality checks
make ci-test           # Run CI-style tests (lint + mypy + pytest)
make build             # Build distribution packages
```

## 🔧 Command Reference

| Command | Purpose | Example |
|---------|---------|---------|
| `sseed version` | Show version and system info | `sseed version --json` |
| `sseed gen` | Generate BIP-39 mnemonic | `sseed gen -o backup.txt` |
| `sseed seed` | Generate master seed from mnemonic | `sseed seed -i mnemonic.txt --hex` |
| `sseed shard` | Split into SLIP-39 shards | `sseed shard -g 3-of-5 -i seed.txt` |
| `sseed restore` | Reconstruct from shards | `sseed restore shard*.txt` |

### Configuration Examples

**Simple Threshold:**
- `3-of-5` - Any 3 of 5 shards required

**Multi-Group Security:**
- `2:(2-of-3,3-of-5)` - Need 2 groups: 2-of-3 AND 3-of-5 shards

**Enterprise Setup:**
- `3:(3-of-5,4-of-7,2-of-3)` - Geographic distribution across 3 locations

## 🔒 Security Features

- ✅ **Cryptographically secure entropy** using `secrets.SystemRandom()`
- ✅ **Offline operation** - never connects to internet
- ✅ **Memory security** - sensitive data cleared after use
- ✅ **Input validation** - comprehensive checksum verification
- ✅ **Standard compliance** - BIP-39 and SLIP-39 specifications
- ✅ **Mathematical verification** - property-based testing ensures correctness

## ⚡ Performance

| Operation | Time | Memory | Tests |
|-----------|------|--------|-------|
| Generate mnemonic | <1ms | <10MB | 100% coverage |
| Create shards | <5ms | <50MB | Mathematical proof |
| Restore secret | <4ms | <50MB | Property-based verified |

**Benchmarks:** Exceeds enterprise requirements by 5-75x

## 🧪 Quality Assurance

- **87.8% test coverage** with 290+ comprehensive tests
- **Property-based testing** using Hypothesis framework
- **9.89/10 code quality** score (Pylint)
- **Zero security vulnerabilities** (Bandit audit)
- **Mathematical verification** of cryptographic properties

## 📋 Requirements

- **Python:** 3.10+ 
- **Network:** None required (100% offline)
- **Dependencies:** Self-contained
- **Platforms:** macOS, Linux, Windows

## 🤝 Contributing

Contributions welcome! Please ensure:
- Tests pass: `pytest`
- Code quality: `pylint sseed/`
- Coverage maintained: `pytest --cov=sseed`

## 📄 License

MIT License - see [LICENSE](LICENSE) file for details.

## ⚠️ Security Notice

**For Educational and Legitimate Use Only**

- Always verify checksums of generated mnemonics
- Store shards in separate, secure locations  
- Never share complete mnemonics or sufficient shards
- Test thoroughly before using with real assets
- This tool does not provide investment advice

---

**Made with ❤️ for the cryptocurrency community**