During October 2025, Hyuan contributed to the envoyproxy/envoy repository by developing a cryptographic signing capability within Envoy’s WebAssembly (Wasm) runtime. Hyuan implemented a new foreign function that allows Wasm modules to generate cryptographic signatures using private keys, addressing secure signing needs for embedded modules. The work involved writing C++ code to handle cryptographic operations, integrating Protocol Buffers for structured data exchange, and updating documentation to support adoption. Hyuan also added utilities for key management and ensured the new function was properly registered in the Wasm FFI. The contribution demonstrated focused depth in cryptography and secure runtime extension using modern tooling.