This month delivered a native backend for little-endian POWER (ppc64le) to accelerate vector arithmetic in the mLEM cryptographic pipeline, expanding platform coverage and setting the foundation for POWER performance optimizations across cryptographic primitives.

April 2026 openssl/openssl monthly summary Key features delivered: PPC64LE-specific MLKEM NTT performance optimization with assembly support for both NTT and inverse NTT, targeting ISA 2.07+. Added PPC64LE assembly files (asm/mlkem_ntt_ppc64le.S, asm/mlkem_intt_ppc64le.S) and updated build system to enable arch-specific MLKEM_NTT_ASM paths. Major bugs fixed: No notable bugs fixed this month for this repository. Overall impact and accomplishments: Achieved ~1.9x speedup in ML-KEM NTT/encaps/decaps throughput on PPC64LE versus the baseline C implementation, enhancing cryptographic operations in PPC64LE environments and improving TLS-related KEM performance. Builds and tests validated the improvement, contributing to better performance-per-watt and lower latency for PQC workflows. Technologies/skills demonstrated: Assembly optimization for PPC64LE, cross-architecture performance engineering, performance benchmarking (throughput improvements), C/assembly integration, build system updates, and collaboration through code review and merge processes.

Monthly summary for openssl/openssl development in 2026-01 focused on PPC64 Big-Endian ABI build stability and cross-ABI integrity. Implemented a precise build fix by removing the .localentry directive to prevent mixing ELFv1 and ELFv2 ABI directives, resolving PPC64 big-endian build failures. The change is tracked in commit 5aaa7e5fdc59e88a13d2911cb86d814d4e2669da and merged from PR 29827, addressing issue #29815. This work enhances portability, CI reliability, and long-term maintenance for PPC64 BE platforms.

OpenSSL 2025-10: Delivered a critical PPC64LE bug fix for AES/GCM by restoring VSX registers in the encryption/decryption path. This corrects behavior, improves performance on PPC64LE, and ensures Linux kernel compatibility. Implemented in commit ebd690b1eb0d95c6784e2f36dd86d72670b82794 and merged from PR28990 with peer reviews by Dmitry Belyavskiy and Tomas Mraz; aligns with kernel patterns for stability and security.

February 2025 monthly summary for openssl/openssl focusing on security hardening and performance in cryptographic operations. Key features delivered: a robust timing side-channel mitigation for the P-384 curve on PowerPC, including replacing a specific Montgomery multiplication with a more general implementation and introducing new assembly optimizations for field element operations to enhance security and maintainability. Major bugs fixed: fix Minerva timing side-channel signal for P-384 on PPC, consolidated in commit 85cabd94958303859b1551364a609d4ff40b67a5. Overall impact and accomplishments: strengthened cryptographic resilience on PPC platforms, improved maintainability of critical code paths, and reinforced OpenSSL’s security posture for production deployments. Technologies/skills demonstrated: cryptographic algorithm implementation, side-channel mitigation techniques, PPC assembly optimizations, cross-platform development, code review, testing, and Git-based version control.