January 2026 — Leyden (openjdk/leyden): Delivered ML-KEM 12-bit decompression optimization on aarch64. Simplified the decompression path, optimized buffer handling and input/output sizes, and improved memory management. No major bugs fixed this month. Impact: performance and maintainability improvements on aarch64 with clearer, more maintainable code paths. Technologies demonstrated: platform-specific optimization, memory management, buffer tuning, and collaborative code review (commit 99119597aa95c1139ae2259bed5ec885a7c01269; Reviewed-by: adinn).

December 2025 openjdk/leyden focused on stabilizing ML_DSA Intrinsics tests for AArch64 and improving test reproducibility to reduce flakiness and increase CI reliability. This work enhances cross-architecture crypto test validation and accelerates platform support in Leyden pipelines.

Monthly performance summary for 2025-05 focused on delivering an AVX-512 optimization for ML-KEM within the Kyber implementation in the openjdk/jdk-sandbox repository. The work emphasizes business value through cryptographic algorithm acceleration and alignment with vectorization capabilities on supported hardware.

Month: 2025-04 — OpenJDK jdk-sandbox delivered key cross-platform SIMD optimizations for ML cryptography and essential code cleanup, driving performance portability and maintainability.

March 2025 monthly summary for openjdk/jdk-sandbox focused on ARM64 optimization work for ML-DSA cryptographic algorithms. Delivered low-level enhancements to accelerate ML-DSA on ARM64 by adding aarch64 intrinsics, new assembler instructions, and stub generation for Dilithium NTT and related operations. The work is anchored by a single committed change that enables hardware-accelerated cryptographic pathways and sets the stage for broader performance improvements across ARM64 platforms.