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Marcel Cornu

PROFILE

Marcel Cornu

Worked extensively on the intel/intel-ipsec-mb repository, delivering cryptographic feature development, performance optimizations, and cross-platform reliability improvements over 16 months. Implemented and optimized AES, SHA3, and VAES routines using C, Assembly, and AVX2/AVX-512 intrinsics, while expanding test coverage and automating build and packaging workflows with CMake and GitHub Actions. Enhanced security by addressing data sanitization and edge-case handling, and improved maintainability through code formatting, documentation, and CI/CD integration. Contributed to OpenSSL and LibOQS with low-level bug fixes and performance refactors, demonstrating expertise in cryptography, low-level programming, and build system management across Linux and Windows environments.

Overall Statistics

Feature vs Bugs

70%Features

Repository Contributions

87Total
Bugs
11
Commits
87
Features
26
Lines of code
57,417
Activity Months16

Work History

March 2026

4 Commits • 2 Features

Mar 1, 2026

March 2026 performance summary focusing on build modernization, ABI/stability, and Windows-specific error handling for cryptographic routines. Delivered a CMake-based build migration for intel/intel-ipsec-mb, fixed critical control-flow issues in SHA-AVX2/AVX512 paths, and added Windows SEH support along with ABI-compliant non-volatile XMM register preservation for AVX2 NTT in OpenSSL. These changes reduce maintenance burden, improve cross-platform reliability, and strengthen cryptographic performance in production deployments.

February 2026

1 Commits • 1 Features

Feb 1, 2026

February 2026: OpenSSL contributions focused on performance optimization for the Number Theoretic Transform (NTT). Implemented a function-pointer-based AVX2/scalar dispatch mechanism, with one-time startup initialization via CRYPTO_THREAD_run_once, replacing inline capability checks. This change improves runtime performance for NTT-heavy cryptographic workloads and enhances maintainability across CPU architectures. Delivered as part of the ML-DSA refactor (commit 3b3680c63936a0c316d25f783eee7406bca1b320) and merged in PR 30160.

January 2026

1 Commits

Jan 1, 2026

January 2026: Key bug fix delivered in LibOQS Keccak AVX512 path. Corrected incorrect argument register update that caused improper pointer increments during output data extraction, ensuring accurate Keccak outputs and preventing data corruption in the AVX512-accelerated routine. Patch references issue #2330 and includes a signed-off commit.

December 2025

7 Commits • 2 Features

Dec 1, 2025

December 2025: Delivered packaging and CI/CD improvements for intel-ipsec-mb, enabling reliable DEB/RPM distribution, robust automated packaging, and stronger code quality checks. Implemented Windows VS2022 byteswap_ulong workaround to improve compatibility. These changes reduce release friction, shorten time-to-delivery, and improve cross-platform reliability. Technologies showcased include CMake/CPack, GitHub Actions, and Windows compatibility engineering, with an emphasis on business value: easier distribution, faster builds, and stronger quality gates.

November 2025

1 Commits

Nov 1, 2025

November 2025 focused on improving the reliability of performance measurements in intel-ipsec-mb by addressing core-count detection robustness in the Performance Module. The fixed error handling increases stability across diverse system configurations, reducing the risk of corrupted benchmarks and ensuring consistent performance data for capacity planning and optimization. This work demonstrates strong debugging, code quality, and alignment with reliability goals for enterprise deployments.

October 2025

5 Commits • 2 Features

Oct 1, 2025

In 2025-10, delivered targeted improvements for the intel-ipsec-mb project, focusing on reliability, maintainability, and visibility. Key outcomes include code quality and documentation cleanup, improved spell-check accuracy through codespell updates, robust handling of AES-CFB zero-length messages, and enhanced MOVBE CPU feature reporting and test coverage.

September 2025

16 Commits • 3 Features

Sep 1, 2025

September 2025 — Intel IPsec MB: Key deliverables focused on expanding fuzz testing coverage, hardening test robustness, and elevating code quality and release readiness across assembly modules. Delivered targeted features and fixes with clear business value and maintainable architecture improvements.

August 2025

1 Commits

Aug 1, 2025

Security hardening for the Intel IPsec MB module in August 2025 focused on eliminating residual sensitive data after AES-CCM operations across all supported architectures (SSE, AVX2 paths, AVX-512 path). This work removes memory remnants of expanded keys and initialization blocks, reducing exposure risk and strengthening data handling compliance.

July 2025

8 Commits • 3 Features

Jul 1, 2025

Month: 2025-07 — Intel IPsec-MB work delivered end-to-end SHA3/SHAKE support in the ACVP app, expanded test coverage, and performance-tool enhancements, with reliability fixes that reduce risk and improve throughput. Highlights include new hashing handlers and test vectors, removal of SHA3 length constraints, and robustness improvements for long data handling, 64-byte sweep testing, and performance skips.

June 2025

10 Commits • 2 Features

Jun 1, 2025

June 2025 monthly summary for intel/intel-ipsec-mb focusing on SHA3/SHAKE integration, testing, and quality improvements that deliver stronger crypto processing, reliability, and faster validation of changes across multiple test suites.

May 2025

8 Commits • 3 Features

May 1, 2025

May 2025 focused on performance, compatibility, and crypto feature expansion for intel-ipsec-mb. Key deliverables include AVX2/AVX512 AES-CCM acceleration with VAES-based counter-mode and authentication, SHA3/SHAKE hashing support, and updated build tooling to maintain compatibility with newer CMake versions. A minor bug fix was applied in the AES-CCM OOO manager, and documentation and legacy build support were updated accordingly. These changes collectively improve IPsec throughput, expand cryptographic capabilities, and reduce build maintenance friction.

April 2025

1 Commits

Apr 1, 2025

April 2025: Focused on stabilizing and hardening the GCM path in intel-ipsec-mb. The primary effort was a cross-OS alignment fix for GCM key data structures achieved by adjusting preprocessor directives to ensure correct alignment on Windows, Linux, and macOS. This work reduces platform-specific cryptographic failures and improves overall reliability of GCM operations in multi-OS deployments. Impact: Increased robustness of the IPsec MB library in diverse environments, with a cleaner, maintainable code path for cross-platform cryptography. Technologies/Skills demonstrated: C, preprocessor directives, cross-platform build validation, cryptographic data structure alignment, debugging, and code review discipline. Commit reference: bbafa7c6d2873bcb4fdbc48771a181dc42d50452

January 2025

2 Commits • 1 Features

Jan 1, 2025

January 2025 — Delivered AES-CMAC AVX2 Type 2 support for intel/intel-ipsec-mb. Implemented the AVX2 Type 2 path and optimized the submission/flush pipeline to reduce store-to-load penalties, resulting in improved throughput for AVX2-enabled workloads. Updated internal docs and release notes to reflect the new capability and associated performance gains. This work strengthens product capabilities for high-throughput cryptographic workloads and improves developer experience with clearer guidance and lifecycle documentation.

December 2024

2 Commits • 1 Features

Dec 1, 2024

December 2024 monthly summary for intel/intel-ipsec-mb focusing on performance-oriented enhancements and benchmark stability. Key features delivered include VAES AVX2 optimization for AES-CMAC, implemented via new assembly files and Makefile updates to unlock higher throughput on AVX2-capable CPUs. Major bug/quality work includes improved ipsec_perf benchmarking stability by updating buffer alignment from 64-byte to 64KB and reducing default test rounds from 16 to 8, resulting in more reproducible measurements. The initiatives collectively improve performance potential on AVX2 hardware, reduce test noise, and streamline build/test configurations. This aligns with business goals of higher secure throughput and predictable performance across platforms.

November 2024

12 Commits • 3 Features

Nov 1, 2024

November 2024 — Key maintainability improvements, a new performance benchmark tool, and AVX2-based crypto enhancements that raise throughput for high-volume workloads. Release processes and documentation were streamlined to speed deliveries and improve onboarding for contributors.

October 2024

8 Commits • 3 Features

Oct 1, 2024

For 2024-10, the team delivered reliability, performance, and documentation improvements for intel/intel-ipsec-mb, aligning cryptographic validation, performance measurement, and maintainability with business value goals.

Activity

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Quality Metrics

Correctness95.6%
Maintainability92.8%
Architecture90.8%
Performance90.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

AssemblyCCMakeGitJavaScriptMakefileMarkdownNroffPythonShell

Technical Skills

API TestingAVX-512AVX2AVX2 IntrinsicsAVX2 VAESAVX2 instructionsAssembly LanguageAssembly Language ProgrammingAssembly ProgrammingAssembly languageAssembly language optimizationAssembly language programmingBuild AutomationBuild System IntegrationBuild Systems

Repositories Contributed To

3 repos

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

intel/intel-ipsec-mb

Oct 2024 Mar 2026
14 Months active

Languages Used

AssemblyCJavaScriptMakefileMarkdownNroffPythonGit

Technical Skills

AVX2 VAESAssembly ProgrammingC ProgrammingCode MaintenanceCopyright ManagementCryptography

openssl/openssl

Feb 2026 Mar 2026
2 Months active

Languages Used

CAssembly

Technical Skills

cryptographylow-level programmingperformance optimizationWindows ABI complianceassembly languageerror handling

open-quantum-safe/liboqs

Jan 2026 Jan 2026
1 Month active

Languages Used

Assembly

Technical Skills

cryptographylow-level programmingperformance optimization