zeekay b5b20c1d90 mpcvm: ringtail → corona rename (Ringtail enum + ceremony kind) ...

Per the canonical-name rename of the lattice-based threshold signature
primitive from Ringtail to Corona. Coordinated with lux-private/gpu-
kernels and luxcpp/gpu so the byte-equal cross-tree ABI stays in lockstep.

Renamed:
  * RingtailDkg / RingtailSign (ceremony-kind enum values 4u/5u)
      → CoronaDkg / CoronaSign
  * SchemeRingtail = 2u → SchemeCorona = 2u  (value preserved)
  * kRingtailDkgRounds / kRingtailSignRounds → kCoronaDkgRounds / kCoronaSignRounds
  * mpcvm_ringtail.{cu,metal,wgsl}        → mpcvm_corona.{cu,metal,wgsl}
                                            (filename refs in CMakeLists)
  * "Ringtail" / "Ringtail R-LWE" comments → "Corona"

Updated:
  * include/lux/mpcvm/mpcvm_gpu_layout.hpp — enum + scheme + rounds + comments
  * src/mpcvm_cpu_reference.cpp           — kind dispatch table
  * src/mpcvm_gpu_engine.mm               — comment
  * test/mpcvm_benchmark.cpp              — fixture enum refs
  * test/mpcvm_layout_test.cpp            — fixture enum refs
  * CMakeLists.txt                        — Metal/CUDA/WGSL kernel filenames

No numeric on-wire constants changed — pure naming rename:
  * RingtailDkg = 4u stays 4u (now spelled CoronaDkg)
  * RingtailSign = 5u stays 5u (now spelled CoronaSign)
  * SchemeRingtail = 2u stays 2u (now spelled SchemeCorona)

The deterministic share envelope (24-byte hash digest at ceremony-finalize
time, mpcvm_state_root composition) is byte-identical post-rename — only
the C++ identifier strings change.

Refs: corona v0.7.6 wire codec ; luxfi/threshold v1.9.4 mldsa-tee +
slhdsa-tee + rlwe-tee TEE-only extensions ; magnetar GPU-port v1.3
(SLH-DSA hash-tree kernels — separate work landing alongside this rename).

2026-06-03 12:45:51 -07:00

..

mpcvm

mpcvm: ringtail → corona rename (Ringtail enum + ceremony kind)

2026-06-03 12:45:51 -07:00