tree be0b4c9795c3d2cffc2e703211caa68b5fc919fe
parent 91b3e2c01b17bdaf989e44b3e971bbd5a4fdb215
author martinduke <martinduke@google.com> 1745507956 -0700
committer Copybara-Service <copybara-worker@google.com> 1745508012 -0700

Eliminate heap allocations from initial obfuscator generation in QUICHE. Each crypter still invokes 16 malloc operations due to OpenSSL HKDF libraries.

When creating initial obfuscators, the Crypters themselves are allocated from the heap, but all operations to populate those crypters are conducted entirely on the stack.

Additional #includes in *_session fix compiler failures in the benchmark test.

Result of benchmark run:
blaze run -c opt --dynamic_mode=off --copt=-gmlt third_party/quic/core/crypto/crypto_utils_benchmark -- --benchmark_filter=all

CPU: Intel Icelake with HyperThreading (24 cores) dL1:48KB dL2:1280KB dL3:54MB
Benchmark                              Time(ns)        CPU(ns)     Iterations
-----------------------------------------------------------------------------
BM_InitialObfuscators                      6506           6583           7290
BM_InitialObfuscators                      6507           6583           7292
BM_InitialObfuscators                      6497           6588           7285
BM_InitialObfuscators                      6525           6585           7296
BM_InitialObfuscators                      6527           6587           7282
BM_InitialObfuscators                      6514           6579           7306
BM_InitialObfuscators                      6504           6616           7260
BM_InitialObfuscators                      6482           6584           7299
BM_InitialObfuscators                      6488           6589           7286
BM_InitialObfuscators                      6489           6042           7291
BM_InitialObfuscators                      6533           6592           7290
BM_InitialObfuscators                      6563           6799          10000
BM_InitialObfuscators_mean                 6513           6568          90177
BM_InitialObfuscators_stddev                 23.5          169          90177

BM_InitialObfuscatorsNoMalloc              6267           6414          10000
BM_InitialObfuscatorsNoMalloc              6316           6405          10000
BM_InitialObfuscatorsNoMalloc              6251           6050           7286
BM_InitialObfuscatorsNoMalloc              6250           6405          10000
BM_InitialObfuscatorsNoMalloc              6266           6045           7294
BM_InitialObfuscatorsNoMalloc              6262           6039           7286
BM_InitialObfuscatorsNoMalloc              6250           6028           7300
BM_InitialObfuscatorsNoMalloc              6232           6040           7292
BM_InitialObfuscatorsNoMalloc              6250           6457          10000
BM_InitialObfuscatorsNoMalloc              6230           6409          10000
BM_InitialObfuscatorsNoMalloc              6243           6405          10000
BM_InitialObfuscatorsNoMalloc              6248           6069           7259
BM_InitialObfuscatorsNoMalloc_mean         6256           6260         103717
BM_InitialObfuscatorsNoMalloc_stddev         22.4          184         103717

Protected by FLAGS_quic_reloadable_flag_quic_heapless_obfuscator.

PiperOrigin-RevId: 751001626