These classes define the common data structures used by the various I2P protocols.

This package contains the fundamental data structures that form the backbone of I2P's communication protocols, including:

• Destination: Complete I2P destination containing public keys and signing information
• LeaseSet: Routing information for establishing tunnels to destinations
• RouterInfo: Router identification and network contact information
• TunnelId: Unique identifiers for tunnel segments
• SessionKey: Encryption keys for secure communication
• Signature: Digital signatures for authentication and integrity
• Certificate: Certificate structures for router identification and capabilities

All data structures implement proper serialization and deserialization for network transmission, with built-in validation and type safety. These classes are designed to be immutable where possible and provide efficient memory usage for high-throughput routing operations.