Kotlin Multiplatform cryptographic primitives (SHA-256, HMAC, HKDF) for the buffer library

DTLS 1.2/1.3 and the DTLS-SRTP key exporter; BoringSSL backends land in W4.

Cloudflare quiche QUIC engine for com.ditchoom:socket-quic (zero-copy, FFM/JNI/cinterop)

STUN/TURN wire codec (RFC 8489/8656) and sans-io transaction machines.