Month: 2026-04 — Delivered a focused refactor of the Keccak Squeezeblocks X4 routine in pq-code-package/mldsa-native to simplify the proof structure and improve maintainability. Introduced a current_offset variable to streamline byte extraction and reduce loop complexity. The change enhances readability and sets the stage for safer future optimizations in cryptographic primitives.

March 2026 performance snapshot across pq-code-package/mldsa-native and pq-code-package/mlkem-c-aarch64. Delivered targeted feature improvements and rigorous correctness fixes that reduce proof times, strengthen API contracts, and improve code clarity, yielding measurable business value in cryptographic workflows and verification efficiency.

February 2026 monthly summary for pq-code-package/mlkem-c-aarch64: Delivered a critical bug fix in the noise generation path and integrated a comprehensive Wycheproof test suite for ML-KEM, reinforcing correctness, security validation, and CI coverage. The work improved validation of key generation, encapsulation, and decapsulation on ARM64, while ensuring correct eta2 coefficient bounds and overall test robustness. Result: reduced risk of incorrect coefficient bounds, improved test coverage, and stronger production readiness.

January 2026 monthly summary for repository pq-code-package/mlkem-c-aarch64. Focused on stabilizing and validating the polyvec_add proof, reducing solver overhead, and improving build reliability. Delivered a stability-first proof enhancement by introducing loop invariants to bound integer ranges, optimizing Z3 solver usage, and disabling loop unrolling to enhance stability and performance during proof generation. These changes reduce verification time variability and establish a foundation for further verification improvements in the aarch64 workflow.

For December 2025, delivered backend consolidation for the mlkem-c-aarch64 proof suite. Reverted proofs to the CBMC SMT back-end to ensure consistency with the established fix-set and removed the SAT back-end dependency. This simplifies backend configuration and maintenance while preserving proof performance and CI stability.

November 2025 highlights: Delivered substantial improvements in formal verification tooling and polynomial vector operations across two repos. In pq-code-package/mldsa-native, stabilized and accelerated proof generation through Makefile refinements, CBMC flag tuning, and Z3 integration; in pq-code-package/mlkem-c-aarch64, modernized CBMC tooling (upgrade to CBMC 6.8.0, Z3 4.15.3 support, new wrappers) and log/noise cleanup. Added explicit input bounds and a permutation-based expansion to strengthen correctness and reduce proof search space. Achieved measurable performance gains, including a polyvec_add proof time reduction from 300s to 100s on a representative K=4 run. These efforts improve verification reliability, reduce time-to-proof, and demonstrate strong cross-repo collaboration and tooling sophistication.

Month: 2025-10. Focus: macro stability improvements across two codebases by migrating macro-generated variable names from __LINE__ to __COUNTER__, plus minor documentation correction. Key features delivered: mlkem-c-aarch64: replaced __LINE__-based macro variable generation with __COUNTER__ for generated names, improving proof stability against minor code changes; commit 17bdc7df125da56a5f6e5f24c229a5c7b6f7e732. mldsa-native: refactored macro definitions to use COUNTER for quantified variable naming, preventing changes from altering names and improving proof reliability; commit 46ecf314a111f081c84ea3ad171fecaa26063ca2. Major bugs fixed: reduced fragility of proofs due to __LINE__-based naming; improved documentation alignment in proof_guide.md. Overall impact and accomplishments: higher proof stability, reduced maintenance churn, and cross-repo consistency; demonstrated macro-level correctness improvements with clear business value. Technologies/skills demonstrated: C macro programming (COUNTER), preprocessor-driven refactoring, cross-repo code hygiene, and documentation governance.

Performance-driven monthly summary for 2025-09: Strengthened formal verification and debugging capabilities across two repos (mlkem-c-aarch64 and mldsa-native). Implemented explicit buffer bounds and guaranteed malloc failure behavior in mlkem-native CBMC proofs; added SMT file generation targets and provenance reporting for multiple provers; enhanced CBMC debugging workflows in mldsa-native with SMT-only generation and a slice-formula option; removed the --no-array-field-sensitivity flag to stabilize proof times. Result: improved safety guarantees, traceability, and cross-prover comparability, enabling faster issue detection and lower verification risk.

July 2025 highlights API modernization and formal verification across two repositories, delivering safer cryptographic primitives, clearer interfaces, and more deterministic verification. Key outcomes include API refactors, enhanced proofs, and configurable verification tooling that reduce risk and accelerate validation cycles.

June 2025 focused on cleaning up verification-related debt and harmonizing builds for next-gen architectures across two PQ code packages. Key outcomes include removing CBMC workarounds post-upgrade, enhancing verifier safety through API-level refactors, and enabling Neoverse-N1 optimization with updated toolchains and build configurations.

May 2025 monthly performance focusing on formal verification improvements for cryptographic libraries and tooling modernization across two repositories. Deliverables emphasize faster, more reliable proofs, better reporting, and licensing clarity, with proven proficiency in formal methods and build tooling.

April 2025 monthly summary focusing on key business- and technically-focused accomplishments across two repositories. Delivered code quality and compliance enhancements with a foundation for future reliability improvements.

March 2025 monthly summary focusing on delivering performance enhancements, robustness, and maintainability across two repositories: mlkem-c-aarch64 and mldsa-native. Key work included AArch64 backend optimizations and macro standardization, formal verification proofs for make_hint, and improvements to the build and test workflow. No distinct major bug fixes were reported; the month emphasized performance, correctness, and reproducibility.

February 2025 monthly summary for repository pq-code-package/mlkem-c-aarch64. Delivered performance optimizations and process improvements for AArch64 back-end components, focusing on INTT/NTT performance, naming consistency, and build automation to enable reproducible optimizations with SLOTHLY.

January 2025: Delivered targeted improvements to the mlkem-c-aarch64 pipeline, focusing on visibility of proof results and macOS execution reliability. The changes improved debugging efficiency, reduced environment-related failures, and contributed to a more stable development and CI experience for the repository.

December 2024 monthly summary for the mlkem-c-aarch64 repository focused on cross-platform build reliability for the benchmark suite. Delivered macOS GCC 14 build compatibility by adjusting compiler behavior to avoid -Wpedantic errors in void* to function pointer conversions used by dlsym, enabling the benchmark tests to compile and run. This fix removes a critical CI/build blocker and tightens cross-platform test coverage.

November 2024: Expanded formal verification coverage and proof workflow efficiency for pq-code-package/mlkem-c-aarch64. Delivered CBMC-based proofs and contracts for message conversion and cryptographic primitives, extended verification to core primitives (indcpa_dec, unpack_ciphertext, FIPS-202 hashes), improved proof generation speed, and completed contract simplifications for maintainability. These efforts strengthen correctness, security guarantees, and development velocity for MLKEM components, enhancing reliability for deployment and certification readiness.

Month: 2024-10 — Focused on strengthening formal verification capabilities in the mlkem-c-aarch64 project. Delivered a CBMC Proof Development Guide for mlkem-native, establishing a repeatable onboarding path and proven proof patterns to accelerate the creation of formal proofs for C code. No major bug fixes were recorded this month, allowing us to devote effort to verification tooling and documentation that will reduce onboarding time and improve verification coverage long-term. Impact: Shortened new-proof ramp-up time and increased verification reliability; standardized approach; ready-to-use guide for future proofs; supports quality gates for PRs.