# Hero Vault Cryptography Examples

This directory contains examples demonstrating the Hero Vault cryptography functionality integrated into the SAL project.

## Overview

Hero Vault provides cryptographic operations including:

- Key space management (creation, loading, encryption, decryption)
- Keypair management (creation, selection, listing)
- Digital signatures (signing and verification)
- Symmetric encryption (key generation, encryption, decryption)
- Ethereum wallet functionality
- Smart contract interactions
- Key-value store with encryption

## Example Files

- `example.rhai` - Basic example demonstrating key management, signing, and encryption
- `advanced_example.rhai` - Advanced example with error handling, conditional logic, and more complex operations
- `key_persistence_example.rhai` - Demonstrates creating and saving a key space to disk
- `load_existing_space.rhai` - Shows how to load a previously created key space and use its keypairs
- `contract_example.rhai` - Demonstrates loading a contract ABI and interacting with smart contracts
- `agung_send_transaction.rhai` - Demonstrates sending native tokens on the Agung network
- `agung_contract_with_args.rhai` - Shows how to interact with contracts with arguments on Agung

## Running the Examples

You can run the examples using the `herodo` tool that comes with the SAL project:

```bash
# Run a single example
herodo --path example.rhai

# Run all examples using the provided script
./run_examples.sh
```

## Key Space Storage

Key spaces are stored in the `~/.hero-vault/key-spaces/` directory by default. Each key space is stored in a separate JSON file named after the key space (e.g., `my_space.json`).

## Ethereum Functionality

The Hero Vault module provides comprehensive Ethereum wallet functionality:

- Creating and managing wallets for different networks
- Sending ETH transactions
- Checking balances
- Interacting with smart contracts (read and write functions)
- Support for multiple networks (Ethereum, Gnosis, Peaq, Agung, etc.)

## Security

Key spaces are encrypted with ChaCha20Poly1305 using a key derived from the provided password. The encryption ensures that the key material is secure at rest.

## Best Practices

1. **Use Strong Passwords**: Since the security of your key spaces depends on the strength of your passwords, use strong, unique passwords.
2. **Backup Key Spaces**: Regularly backup your key spaces directory to prevent data loss.
3. **Script Organization**: Split your scripts into logical units, with separate scripts for key creation and key usage.
4. **Error Handling**: Always check the return values of functions to ensure operations succeeded before proceeding.
5. **Network Selection**: When working with Ethereum functionality, be explicit about which network you're targeting to avoid confusion.
6. **Gas Management**: For Ethereum transactions, consider gas costs and set appropriate gas limits.