Files
wolfssl/tests/api
Juliusz Sosinowicz c815d98ef4 DTLS throughput: add benchmark tool and optimize the record send path
Add examples/benchmark/dtls_bench, a DTLS throughput benchmark that
completes a handshake and then measures bulk-send throughput. It
supports DTLS 1.2 and 1.3, selectable cipher suites, an end-to-end
mode, and a -z sink mode that discards records on the server after the
handshake to isolate the sender's record-layer cost. The socket is set
up with wolfSSL_set_dtls_fd_connected.

Optimize the send path exercised by the benchmark:

- wolfio (EmbedSendTo): cache the per-descriptor socket-type probe
  (getsockopt SO_TYPE) in WOLFSSL_DTLS_CTX instead of running it on
  every send, removing a syscall from the record send path. The cache
  is invalidated whenever rfd/wfd is reassigned.

- internal (BuildMessage): for AEAD suites whose explicit nonce is the
  8-byte record sequence number, write the sequence number directly as
  nonce_explicit instead of drawing it from the RNG. This covers
  AES-GCM (RFC 5288 sec 3), AES-CCM (RFC 6655 sec 3), SM4-GCM/CCM
  (RFC 8998 sec 3), and Camellia-/ARIA-GCM which inherit the RFC 5288
  construction; ChaCha20 uses an implicit nonce and is excluded. A new
  read-only PeekSEQ() helper reads the sequence number without advancing
  the per-direction counter, leaving the single mandated increment to
  writeAeadAuthData().

Also ignore the built dtls_bench binary in .gitignore.
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