During December 2025, Nojima developed an extensible SslDigest feature for the wasmerio/pingora repository, enabling extraction of TLS information such as SNI and SANs from client certificates during the TLS handshake. Working in Rust and focusing on backend development and asynchronous programming, Nojima refactored the handshake_complete_callback API to use immutable references for improved safety and lifetime management. The implementation included comprehensive unit tests and a client_cert.rs example, supporting maintainability and future extensibility. By aligning with industry-standard patterns for TLS data extraction, this work enhanced server-side authentication, observability, and the ability to tailor responses based on client certificate data.