April 2026 performance month for cryspen/libcrux focused on delivering feature enhancements, reducing deployment footprint, and stabilizing critical systems. Key efforts included Eurydice integration refresh with an array equality macro to improve correctness, significant Docker image size reductions for faster deployments, AVX2-based extraction performance enhancements with updated data structures and serialization, and robustness improvements in cryptographic initialization. Additionally, stability improvements to benchmarks and ML-KEM tests ensured reliable performance measurements and correctness. Two priority bug fixes mitigated undefined behavior in cryptographic operations and improved test reliability. These changes collectively advance security, performance, and deployment efficiency, enabling smoother product workloads and safer cryptographic operations.

March 2026 focused on delivering robust cryptographic functionality, API surface improvements, and stronger release hygiene in cryspen/libcrux. Key outcomes include ML-DSA extraction updates and new re-exports, libcrux API simplifications, expanded documentation, and improved packaging. Critical bug fixes address verification and decoding correctness (infinity norm, AES hint), and boundary safety (SHA3 AVX2), complemented by fixes in PSQ and ciphersuite handling. Release automation and testing gained momentum with CAVP tests for portable incremental XOF, fuzzing scaffolding, and comprehensive changelog updates, enabling safer and faster releases.

February 2026 monthly summary for cryspen/libcrux focusing on API cleanup, reliability hardening, and release readiness. Key features delivered include API cleanup and interface alignment across cryptographic libraries (HACSpec-lib: removing lifetime elision warning and renaming array conversion functions; Kyber: aligning array conversion function names), and PSQ API improvements to propagate AEADError instead of panics along with an adjusted expect signature for sig-based initiator authentication. Ed25519 updates added test vectors for secret→public and signing, removed a duplicate clamping step, and updated the changelog. Release engineering advanced with pre-release and release version bumps across modules, plus changelog PR reference corrections for traceability. Ongoing maintenance and quality work included Clippy fixes, removal of commented code, and addressing code-review feedback, with work underway on external nonce control and caller serialization for PSQ. This combination reduces runtime panics, improves security posture, accelerates release cycles, and enhances test coverage and maintainability.

January 2026 monthly summary for cryspen/libcrux focusing on delivering business value while advancing security, interoperability, and release readiness. Key features delivered include PSQ session binding improvements with optional imports and Into<Option<_>> support, and established encoding interoperability tests. Major reliability and security fixes include the X25519 private key clamping fix and clamping verification improvements. The month also emphasized heavy dependency management and pre-release preparation across cryptography crates, enabling a smooth path to release. Documentation and CI coverage were strengthened, including no_std considerations and usage examples, improving developer onboarding and release confidence.

December 2025 saw Cryspen/libcrux solidify developer experience while advancing security and reliability. We delivered comprehensive documentation improvements (including Readme, changelogs, and ciphersuite docs), stabilized the CI/test pipeline, and implemented meaningful cryptography refinements that improve maintainability and security. Handshake interoperability and security were strengthened through protocol fixes, and session security features were expanded with a new responder API and secret export capabilities. Overall, these efforts reduced release risk, improved onboarding, and set the stage for faster, safer feature delivery.

November 2025 monthly summary for cryspen/libcrux focusing on stability, cross-arch CI readiness, and crypto stack hardening, with extensive testing, documentation, and publishing hygiene improvements. Delivered critical bug fixes, feature improvements, and infrastructure upgrades that reduce release risk and improve business value, performance, and maintainability.

In October 2025, the libcrux effort focused on stabilizing the build and tests, enhancing API usability, expanding cryptographic capabilities, and improving developer experience and documentation to accelerate adoption and reliability across downstream projects.

Month: 2025-09 Overview: Delivered substantial cryptographic framework enhancements and reliability improvements in cryspen/libcrux. Key outcomes include enabling algorithm agility through trait-based ciphersuites, expanding crypto surface with AES support and ECDH capabilities, and establishing PQCP APIs with modular macro/documentation scaffolding. Strengthened build reliability by removing erroneous cfg usage and reverting problematic system bindings, while achieving performance and size improvements through inline optimizations and release symbol stripping. These changes improve security posture, developer experience, and deployment efficiency across client projects and internal workflows.

2025-08 monthly summary for cryspen/libcrux: Security-first refactors and reliability enhancements across session handling, cryptography, and CI. Delivered targeted improvements with measurable business value: easier secure session lifecycle, robust cryptographic primitives, and a more predictable release process.

July 2025: Cryspen/libcrux delivered foundational PSQv2 capabilities, expanded TLS/codec support, and core API improvements that increase security, interoperability, and developer productivity. Key work included building the initial PSQv2 Query Mode and Registration Mode with roundtrip tests, implementing TLSCodec support for ML-KEM, and broadening key handling and serialization APIs. The team enhanced reliability with timestamp fixes, improved error propagation, and safer session key handling, complemented by test organization, benchmarking enhancements, and maintenance fixes. These efforts collectively enable secure, scalable deployments and faster iteration on new protocol features.

May 2025 monthly summary for cryspen/libcrux and related repository metadata synchronization. Focused on delivering business value through CI improvements, numerical stability in Montgomery arithmetic, and metadata synchronization to improve traceability. Demonstrated strong cross-platform testing, code quality, and clear documentation.

April 2025 monthly summary for cryspen/hax focusing on delivering robust backend reliability improvements, expanded verification capabilities, and enhanced debugging support. Achievements include ProVerif backend reliability and readability improvements, enabling better correctness and error handling; Boolean bitwise operations support in FStar to enable proper boolean logic in verification; and debugging formatting enhancements to improve troubleshooting and developer productivity.

March 2025: Cryspen/hax delivered two verification-focused features, with no major bugs reported this period. Key outcomes include formalizing BitXor operations within the F* proof system and improving the ProVerif backend's field accessor generation for correctness and maintainability. The work strengthens verification guarantees, reduces risk in bitwise operations, and enhances code readability and maintainability across generated accessors.

February 2025 monthly summary for cryspen/libcrux: Delivered developer-focused improvements and substantive crypto feature work. Key features included comprehensive documentation and Readmes enhancements; CI and workflow improvements with split workflows and consistent naming; Ed25519 Credential API and serialization updates; Ed25519 key generation via libcrux with authentication cleanup; and ClassicMcEliece Decode implementation. Major bugs fixed in CI workflows and review-related issues, improving reliability and clarity. The work accelerates onboarding, improves benchmarking visibility, and strengthens cryptographic capabilities, delivering measurable business value and maintainability.

January 2025 highlights for cryspen/libcrux: delivered portability and reliability enhancements, expanded cross-environment support, and strengthened documentation and testing. The work enables constrained environments (no_std via alloc) and broader SIMD/back-end variant support, with robust test stability across platforms. Business value includes easier deployment in embedded/edge scenarios, improved reliability in cryptographic operations, and clearer build requirements for constrained deployments.

December 2024 monthly summary for cryspen/hax: Focused on onboarding UX and reliability by documenting PATH guidance for cargo-hax installation. Added explicit guidance in README to ensure $HOME/.cargo/bin is in PATH so the setup.sh-installed hax executable can be found and used after installation. This work centers on improving discoverability of the hax binary and reducing setup friction for first-time users. No major bugs reported this month; ongoing monitoring of installation flow.

November 2024 (2024-11) monthly summary for cryspen/libcrux. Delivered core features, stability improvements, and performance optimizations across the cryptographic stack. Key items include removal of Zeta arrays to simplify data structures, introduction of the SHA-3 AVX2 target feature with guarded usage, and inverse NTT optimizations with inlining and implementation-level PNT improvements. Additional work stabilized header and extraction flows, refactored trait interfaces to wrappers, and updated F* tooling support. Notable bug fixes improved type completeness, build stability, and encoding/decoding robustness. Overall, the month reduced maintenance burden, enhanced portability across architectures, and strengthened correctness in KEM/DSA components, driving tangible business value through faster iterations and more reliable releases.

In October 2024, delivered performance-focused cryptographic optimizations in cryspen/libcrux alongside a maintainability-focused refactor of the ACVP test suite. The changes improve throughput of critical primitives, stabilize builds, and establish clearer, more maintainable test coverage, aligning with performance goals and reliability commitments for production deployments.