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Matthias J. Kannwischer

PROFILE

Matthias J. Kannwischer

Over the past 18 months, this developer engineered and maintained the pq-code-package/mlkem-c-aarch64 and pq-code-package/mldsa-native repositories, focusing on cryptographic primitives, formal verification, and cross-architecture performance. They implemented hardware-accelerated routines in C and assembly, optimized polynomial arithmetic with AVX2 and AArch64 intrinsics, and integrated automated CI/CD pipelines for robust testing and benchmarking. Their work included CBMC and HOL Light proofs to ensure correctness and constant-time guarantees, as well as extensive refactoring for maintainability and namespace safety. By modernizing build systems and aligning with upstream libraries, they improved reliability, security, and portability across diverse hardware and software environments.

Overall Statistics

Feature vs Bugs

83%Features

Repository Contributions

706Total
Bugs
61
Commits
706
Features
292
Lines of code
2,635,203
Activity Months18

Work History

March 2026

13 Commits • 7 Features

Mar 1, 2026

March 2026 monthly summary focusing on significant deliverables and business impact across core cryptography packages. Key efforts spanned documentation, cryptographic proofs and constants, assembly hardening, CI reliability, and Arm64/vector optimization, enabling safer deploys, faster verification, and clearer maintainability.

February 2026

67 Commits • 24 Features

Feb 1, 2026

February 2026 highlights across the ML-KEM verification stack (pq-code-package/mlkem-c-aarch64, pq-code-package/mldsa-native, awslabs/s2n-bignum). The month focused on stabilizing CI pipelines, expanding cross-architecture verification, delivering performance-oriented optimizations, and strengthening security proof coverage. Business value delivered includes faster, more reliable feedback loops for cryptographic software, improved hardware-target readiness (AArch64 and x86_64), and deeper formal verification coverage that reduces risk in production deployments.

January 2026

72 Commits • 48 Features

Jan 1, 2026

January 2026 performance summary: Delivered correctness and reliability gains across multiple repos, strengthened CI and cross-architecture support, and expanded memory-allocation visibility to inform capacity planning. The work focused on hardening proofs, improving automation, and reducing symbol conflicts to enable safer multi-repo integration, while laying groundwork for scalable optimizations. Key highlights by area: - Polymat_permute proof enhancement: aligned native and C backends by calling mlk_polyvec_permute_bitrev_to_custom via contract, closing a proof gap and improving proof reliability. - CI and test infrastructure improvements: enabled gcc15 tests on MacOS, added symlink-check, and bumped OpenTitan version to keep CI current and robust. - MLK_TOTAL_ALLOC constants overhaul: introduced per-operation MLK_TOTAL_ALLOC constants, added PCT-aware variants, and removed legacy MLK_MAX_TOTAL_ALLOC constants to clarify memory budgeting across configurations. - KeccakP namespace: added mlk_ namespace to symbols to prevent clashes in multi-project builds. - HOL server integration: added hol_server for programmatic HOL Light communication, enabling automation via TCP/netcat or VS Code extension. Overall impact: increased confidence in proofs and builds, improved automation and cross-platform support, and better visibility into memory usage for scalable deployments.

December 2025

63 Commits • 30 Features

Dec 1, 2025

December 2025 delivered security hardening, build stability, and CI reliability across multiple codebases. Key security fix: proper zeroization of pkpv in Indcpa implementations. Build stability improvements included reverting a CFLAGS change that caused env/make conflicts. Major CI and proof engineering enhancements accelerated workflows: OpenTitan derand tests speed-ups, x86_64 HOL-Light/N\NTT proof support via qdata autogeneration, and POWER10 CI tooling plus markdown-link checks. Refactored mldsa-native headers/config to derive from a single config, enabling simpler multi-level builds and CBMC proofs. Expanded test coverage with alloc tests and config variation handling. Collectively, these changes reduce security risk, shorten CI cycles, and strengthen cross-architecture proofs and documentation hygiene.

November 2025

4 Commits • 2 Features

Nov 1, 2025

Month: 2025-11 — Focused on enabling OpenTitan integration in the pq-code-package/mlkem-c-aarch64 repo by updating CI/dependency management and aligning with upstream mlkem-native. Key changes improved CI reliability and documentation clarity, facilitating smoother OpenTitan adoption and faster feedback cycles.

October 2025

34 Commits • 16 Features

Oct 1, 2025

October 2025: Strengthened formal verification, CI reliability, and hardware acceleration across the pq-code-package repos. Delivered significant CBMC proof modeling enhancements, expanded Baremetal CI and build system capabilities, enabled hardware-accelerated Keccak processing with broader CI coverage, and improved code safety and consistency. The work enhanced verification confidence, CI stability, and maintainability while enabling safer, higher-performance cryptographic primitives.

September 2025

20 Commits • 9 Features

Sep 1, 2025

September 2025 focused on delivering a resilient, security-aware, cross-architecture platform for ML-DSA workflows, with an emphasis on integrating liboqs, modernizing CI/CD, and strengthening cryptographic testing and verification pipelines. The work enabled deeper cryptographic interoperability, improved tooling reliability, and faster verification cycles that support secure deployments across environments.

August 2025

9 Commits • 3 Features

Aug 1, 2025

August 2025 monthly summary focusing on delivering measurable business value through performance improvements, build reliability, and cross-architecture support across two repositories. In pq-code-package/mlkem-c-aarch64, CI stability and compatibility upgrades were implemented by upgrading liboqs to 0.14.0 and aws-lc to 1.56.0, adding clang-21 support to the CI/test workflows, adjusting constant-time tests, and removing an obsolete AWS-LC patch in favor of upstream changes to simplify builds and improve reliability. In pq-code-package/mldsa-native, native AVX2 and AArch64 implementations for poly_decompose and poly_caddq were added to accelerate polynomial operations in cryptographic routines, complemented by a codebase refactor that inlines rounding and reduction logic into headers and updates Makefile-based CBMC proofs to reduce function-call overhead and streamline proofs. Overall, the changes improve performance of cryptographic primitives, reduce build complexity, and strengthen maintainability, with clear benefits to release reliability, developer velocity, and upstream alignment.

July 2025

42 Commits • 12 Features

Jul 1, 2025

July 2025 highlights across pq-code-package/mlkem-c-aarch64 and pq-code-package/mldsa-native. Delivered features that strengthen cryptographic validation, modernized the build environment, and improved code quality and maintainability. Key outcomes include expanded ACVP coverage with on-demand test vectors and versioned testing in CI, upgraded formal verification tooling with reproducible CBMC proofs, and modernization of dependencies and naming conventions to reduce risk and improve onboarding. Key features and improvements: - ACVP Testing Enhancements and CI Coverage: on-the-fly testvector download, --version targeting for ACVP tests, and CI iterations across multiple ACVP versions to broaden cryptographic validation coverage. - CBMC Tooling and Proof Reproducibility: updated CBMC to 6.7.1, reverted to Z3 4.12.6, and enhanced CBMC proof documentation to ensure consistent, repeatable verification workflows. - Dependency Upgrades and Build Environment Modernization: upgraded liboqs and AWS-LC; autogenerating RV64 twiddle factors to improve cryptographic constants accuracy and maintainability. - Code Quality and Stability Improvements: introduced mlk_zetas namespace to prevent conflicts; refactored core types to mld_* prefixes (mld_poly, mld_polyvecl, mld_polyveck) and aligned static functions naming; ensured isolated builds. - Documentation and Integration Guidance: updated README and user-facing docs to reflect new applications and mlkem-native integration versions, supporting accurate adoption timelines and versioning. Impact and business value: - Expanded cryptographic validation coverage reduces risk in production deployments. - Reproducible proofs and stable builds shorten verification cycles and improve auditability. - Up-to-date dependencies and improved naming conventions lower maintenance burden and accelerate onboarding for engineers and customers. - Clear integration guidance supports faster customer adoption and reduces integration errors.

June 2025

28 Commits • 8 Features

Jun 1, 2025

June 2025 performance summary for pq-code-package repositories. The work across mldsa-native, mlkem-c-aarch64, and liboqs focused on strengthening CI reliability, broadening cross-platform support, and advancing cryptographic software quality. Delivered measurable business value through faster feedback loops, better test coverage, and cleaner maintenance of core libraries.

May 2025

87 Commits • 44 Features

May 1, 2025

May 2025 focused on verification rigor, performance optimization, and CI/DevOps modernization across the two codebases: pq-code-package/mlkem-c-aarch64 and pq-code-package/mldsa-native. Deliverables strengthened cryptographic correctness, improved build reliability, and accelerated cryptographic workloads, positioning us for heavier workloads and faster feedback loops. Key activities included upgrading the CBMC toolchain to 6.6.0, delivering HOL-Light-based proofs for AArch64 mlk components and multiple Keccak variants, restructuring MLkem for maintainability, enabling Neon/AVX2 accelerations, and modernizing CI and infrastructure (Dependabot, nixpkgs updates, cache-aware workflows, and EC2 benchmarking).

April 2025

42 Commits • 20 Features

Apr 1, 2025

April 2025: Focused on stabilizing CI/benchmarking, strengthening the native MLKEM path, and governance through licensing and build quality improvements. Delivered concrete improvements to CI tooling, benchmark reliability, and dependency updates; added hardware coverage with Mac Mini M1; expanded formal verification contracts and proofs; and enforced stricter build quality checks.

March 2025

60 Commits • 19 Features

Mar 1, 2025

March 2025 development month focused on expanding CI/CD reliability, cross-architecture benchmarking capabilities, and strengthening cryptographic integrations across three repositories. Delivered concrete features, fixed key issues, and advanced technical readiness that drives faster feedback, broader platform support, and secure crypto implementations.

February 2025

35 Commits • 6 Features

Feb 1, 2025

February 2025: Delivered substantial CI/benchmarking, security hardening, automated verification, and governance improvements across two repositories. Focused on reliability of cross‑platform performance measurement, stronger security posture, and maintainable code quality to enable faster, safer releases.

January 2025

36 Commits • 10 Features

Jan 1, 2025

January 2025 monthly summary for pq-code-package/mlkem-c-aarch64. Focused on delivering formal verification, reliability, and performance improvements across the Keccak/SHA3 implementation and its build/test infrastructure, with rising cross-arch quality and portability for production use.

December 2024

32 Commits • 16 Features

Dec 1, 2024

December 2024 performance summary for pq-code-package/mlkem-c-aarch64: Delivered strategic portability, verification, and maintainability improvements across code, CI, and build tooling. The work emphasizes business value through robust cross-architecture support, formal verification readiness, and streamlined development workflows.

November 2024

52 Commits • 14 Features

Nov 1, 2024

November 2024 performance summary focused on formal verification readiness, native architecture polish, and reliability improvements. Delivered CBMC specifications and proofs for core polynomial operations (poly_sub, polyvec_add, polyvec_compress, pack_sk, unpack_sk, polyvec_ntt) with a corrected gen_matrix_entry proof. Cleaned CBMC scaffolding and build hygiene to reduce maintenance and tighten bounds/formatting. Renamed the target from mlkem-c-aarch64 to mlkem-native to reflect the native implementation. Added _ctx_release() to support dynamic contexts for FIPS202 integrations. Refactored poly compression APIs (poly_compress_du / poly_decompress_du) into a dedicated function and updated related proofs; adjusted polyvec references to dv forms. Benchmarks: fixed bench_components; stabilized EC2 bench runs; expanded benchmarks to cover poly_compress_du + poly_decompress_du; updated alpha-release docs and licensing, plus C90 compatibility fixes and rej_uniform native implementation with added padding.

October 2024

10 Commits • 4 Features

Oct 1, 2024

October 2024 monthly summary for pq-code-package/mlkem-native: Implemented namespace enforcement, input validation, code refactor for a unified polyvec-basemul_acc_montgomery interface across architectures, and CI security hardening. These efforts improve code organization, robustness, maintainability, and CI reliability, delivering value through fewer symbol collisions, stronger validation, simplified cross-arch interfaces, and more secure, stable builds.

Activity

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Quality Metrics

Correctness95.4%
Maintainability90.4%
Architecture92.4%
Performance86.4%
AI Usage21.6%

Skills & Technologies

Programming Languages

AssemblyBashCCMakeHOL LightJSONJavaScriptMLMakefileMarkdown

Technical Skills

AArch64 ArchitectureAArch64 architectureAArch64 assemblyAPI DesignAPI IntegrationAPI designAPI developmentAPI integrationARMARM ArchitectureARM AssemblyARM architectureAVX2AVX2 Assembly ProgrammingAVX2 Intrinsics

Repositories Contributed To

5 repos

Overview of all repositories you've contributed to across your timeline

pq-code-package/mlkem-c-aarch64

Nov 2024 Mar 2026
17 Months active

Languages Used

AssemblyCMakefileMarkdownNixPythonShellYAML

Technical Skills

API DesignAlgorithm ImplementationAlgorithm implementationBenchmarkingBuild SystemsC

pq-code-package/mldsa-native

Feb 2025 Mar 2026
13 Months active

Languages Used

BashCMakefileMarkdownNixPythonShellYAML

Technical Skills

Automated TestingBuild SystemsCC ProgrammingC programmingCBMC

pq-code-package/mlkem-native

Oct 2024 Oct 2024
1 Month active

Languages Used

AssemblyCPythonYAML

Technical Skills

Assembly ProgrammingBuild SystemsBuild systemsCI/CDCode organizationCryptography

open-quantum-safe/liboqs

Mar 2025 Jan 2026
4 Months active

Languages Used

CYAMLAssemblyCMakePython

Technical Skills

API DesignARMAVX2AssemblyBuild SystemsC

awslabs/s2n-bignum

Dec 2025 Mar 2026
4 Months active

Languages Used

OCamlAssembly

Technical Skills

formal verificationfunctional programmingproof assistantsassembly languagecomputer architecturelow-level programming