Concise monthly summary for 2026-03 highlighting key deliverables, critical fixes, and impact across cryspen/libcrux. Focused on cryptographic robustness, reliability, and maintainability with measurable business value.

February 2026 monthly summary: Focused on governance and security readiness for cryspen/libcrux. Implemented Documentation and Security Policy Clarification to reflect pre-release status and vulnerability reporting procedures. This work is anchored by commit 261d13e7a8b7e808982d666b63204996355a36e7 (Security Policy Update).

October 2025 monthly summary for cryspen/libcrux: Delivered key platform reliability and verification improvements. Fixed cross-platform HAX extraction path correctness on macOS, streamlined the build system by simplifying the Makefile, and expanded formal verification capacity by raising Z3 resource limits across modules. These changes reduce build-time churn, improve cross-platform reliability, and enable more thorough verification of larger proofs.

September 2025: Delivered a targeted enhancement to the Rust core by introducing testable SIMD intrinsics models, enabling cross-architecture testing (x86 and aarch64) and paving the way for formal proofs in cryptographic libraries. This work aligns with Rust core design patterns and strengthens the foundation for verifiable SIMD paths.

Month 2025-08: Delivered focused ML-KEM performance and NTT optimizations, strengthened CI/build reliability, and stabilized ML-DSA verification paths, while improving code quality and maintainability. This work delivers faster key encapsulation operations, more robust verification pipelines, and a maintainable codebase, enabling faster release cycles and reduced risk in production deployments.

June 2025 performance summary for cryspen/hax and cryspen/libcrux. Delivered robust cryptographic primitives, architecture-aware optimizations, and stronger repository hygiene. Key outcomes include cross-language SHA-256 robustness and updated build process; Keccak hashing core refactor for clearer logic; ARM64 SHA3 block handling and SIMD boundary fixes; AVX2 loading/storing improvements; and coordinated code generation/versioning and dependency tracking across components. Additional improvements include documentation cleanup, submissions changelog, and Docker/Karamel tooling updates to ensure repeatable, auditable builds.

May 2025 monthly summary: Delivered a refreshed C codebase and extended portability for cryspen/libcrux, restored Eurydice glue integration, and activated CI/ML-DSA CI with improved Docker install times. Implemented guard-based fixes to resolve build issues, enhanced polynomial operations and NTT performance, and completed local verification workflow. Result: faster, more reliable builds, stronger verification, and a cleaner codebase ready for rapid iteration.

April 2025 performance summary: Delivered cross-repo improvements across cryspen/libcrux and cryspen/hax focusing on performance, reliability, and portability. Focused on code quality, build hygiene, and foundational capabilities to enable faster iteration and safer deployments. Key outcomes include formatting standardization, performance-oriented inlining refinements, and extraction workflow enhancements that reduce maintenance overhead, alongside build reliability improvements and cross-platform readiness. Security and quality were advanced with secret exposure mitigations, code-review driven cleanups, and verified local tests. Foundational capabilities were expanded with hash data structures groundwork in F*, RCON generic support, feature flags handling, benchmarking support, and refreshed ML crypto code, setting the stage for future features and performance gains. These efforts improve developer productivity, reliability of deployments, and overall performance of cryptographic and verification workloads.

March 2025 monthly summary for cryspen development across libcrux and hax. The month emphasized delivering high-impact features, strengthening portability across architectures, and enhancing performance, reliability, and code quality. Key business value was unlocked through a cryptographic component (CPA module), multi-arch portability, and performance improvements for varied hardware. The narrative highlights concrete deliverables, stability improvements, and the technologies demonstrated.

February 2025 performance summary focusing on API expansion, correctness, and cross-repo stability across cryspen/hax and cryspen/libcrux. Delivered foundational numeric API enhancements, Prop/Int surface scaffolding, and cross-language integration, while applying key fixes to improve reliability and maintainability. The work strengthens business value by enabling richer numeric abstractions, more robust proofs, and streamlined development workflows.

January 2025 monthly summary for model-checking/verify-rust-std. Delivered foundational documentation and contract-ready framework for high-assurance SIMD intrinsics (Challenge 15) within the repository. Established testable contracts for cross-platform SIMD intrinsics on x86_64 and aarch64, enabling formal verification workflows and safer Rust SIMD code.

Across December 2024, Cryspen delivered major reliability and foundation improvements across libcrux and hax. Key work focused on stabilizing the core C codebase with formatting and status-tracking enhancements, enabling stronger visibility into build health. Verification status tracking was introduced with a dedicated table and status display to improve traceability. F* support and proofs were expanded with updates, refreshes, and new proof helpers, reducing friction in formal verification workflows. A resource limit handling bug was fixed to ensure stable runtime behavior under constrained environments. Foundational API work on standard collections, including Hash Map API groundwork, refactoring to eqtype structures, and internal type improvements, sets the stage for performance and maintainability gains. These efforts collectively improved reliability, traceability, and developer productivity, while expanding the technical stack competencies demonstrated (C, F*, formal verification tooling, and language/library refactors).

Concise monthly summary for 2024-11 focusing on business value and technical accomplishments across cryspen/libcrux and cryspen/hax. Delivered stability, features, and groundwork enabling future development. Highlights include comprehensive FStar refresh and enhancements, ML-DSA maintenance, C code modernization, DSA integration, and foundational Hax capabilities; plus CI/build optimization work and quality improvements.