openssl/openssl
Oct 2024 – Dec 2025
3 Months active
Languages Used
CPerl
Technical Skills
CryptographyLow-level ProgrammingSecurityC ProgrammingEmbedded SystemsScripting
Joachim Vandersmissen
PROFILE
Joachim Vandersmissen
Over three months, Jeroen Vandezande contributed to the openssl/openssl repository, focusing on cryptographic protocol robustness and security compliance. He enhanced TLS 1.2 by implementing RFC 7919 group handling, improving server cipher suite selection and DH parameter negotiation. Jeroen strengthened ML-KEM by expanding memory zeroization to prevent sensitive data leakage, and improved test reliability for ML-DSA, SLH-DSA, and ML-KEM through corruption testing hooks and expanded coverage. His work, primarily in C with cryptography and network security expertise, addressed both feature development and bug fixes, demonstrating depth in secure coding, protocol compliance, and collaborative code review within a complex codebase.
Overall Statistics
Feature vs Bugs
50%Features
Repository Contributions
8Total
Bugs
2
Commits
8
Features
2
Lines of code
555
Activity Months3
Your Network
365 peopleShared Repositories
365
Work History
December 2025
3 Commits • 1 Features
Dec 1, 2025Monthly summary for 2025-12: Focused on RFC7919 enhancements in TLS 1.2 within openssl/openssl, enabling RFC 7919 group handling and improving security postures, along with test coverage and maintainability.
3 Commits • 1 Features
Dec 1, 2025Monthly summary for 2025-12: Focused on RFC7919 enhancements in TLS 1.2 within openssl/openssl, enabling RFC 7919 group handling and improving security postures, along with test coverage and maintainability.
December 2025
April 2025
4 Commits • 1 Features
Apr 1, 2025April 2025 (openssl/openssl) – Focused on robustness, security hardening, and test resilience for ML-assisted cryptographic schemes. Key features and security improvements were delivered with targeted test coverage enhancements and memory-zeroization hardening. Key features delivered: - ML-DSA/SLH-DSA pairwise test enhancements: added corruption testing hook for ML-DSA pairwise tests, robust error handling for failed pairwise tests, and expanded pairwise failure test coverage to ML-DSA, SLH-DSA, and ML-KEM. Commits: 89b5a9b8bcf6bfc6d210a8078c43e6f8f77c1377; 17cacc1a1c85b65ba94f76890810d2ada6243f38; 3f28cc6e63cdafdea08921abf12066ddfc68e6ec. - ML-KEM security hardening and zeroization: zeroizes sensitive data more effectively by using the full state size for zeroization of z and d values, preventing potential data leakage and aligning with best practices. Commit: 5d44f67aafb26ea3adcd33cd6d34bc17e40466cb. Major bugs fixed: - ML-KEM zeroization hardening to ensure complete state zeroization and reduce leakage risk (commit 5d44f67aafb26ea3adcd33cd6d34bc17e40466cb). Overall impact and accomplishments: - Improved test robustness and coverage for ML-DSA/SLH-DSA/ML-KEM, reducing susceptibility to corrupted inputs and test flakiness. - Strengthened security posture by addressing potential data leakage in ML-KEM through comprehensive state zeroization. - Enhanced reliability of cryptographic tests in OpenSSL, enabling safer deployments in production environments. Technologies/skills demonstrated: - OpenSSL codebase contributions in C, cryptographic protocol testing (PCT), test harness expansion, and memory security practices. - Debugging for complex crypto test failures, secure coding, and security-focused code review. - Cross-scheme testing coordination (ML-DSA, SLH-DSA, ML-KEM) and rigorous validation of test coverage.
April 2025
4 Commits • 1 Features
Apr 1, 2025April 2025 (openssl/openssl) – Focused on robustness, security hardening, and test resilience for ML-assisted cryptographic schemes. Key features and security improvements were delivered with targeted test coverage enhancements and memory-zeroization hardening. Key features delivered: - ML-DSA/SLH-DSA pairwise test enhancements: added corruption testing hook for ML-DSA pairwise tests, robust error handling for failed pairwise tests, and expanded pairwise failure test coverage to ML-DSA, SLH-DSA, and ML-KEM. Commits: 89b5a9b8bcf6bfc6d210a8078c43e6f8f77c1377; 17cacc1a1c85b65ba94f76890810d2ada6243f38; 3f28cc6e63cdafdea08921abf12066ddfc68e6ec. - ML-KEM security hardening and zeroization: zeroizes sensitive data more effectively by using the full state size for zeroization of z and d values, preventing potential data leakage and aligning with best practices. Commit: 5d44f67aafb26ea3adcd33cd6d34bc17e40466cb. Major bugs fixed: - ML-KEM zeroization hardening to ensure complete state zeroization and reduce leakage risk (commit 5d44f67aafb26ea3adcd33cd6d34bc17e40466cb). Overall impact and accomplishments: - Improved test robustness and coverage for ML-DSA/SLH-DSA/ML-KEM, reducing susceptibility to corrupted inputs and test flakiness. - Strengthened security posture by addressing potential data leakage in ML-KEM through comprehensive state zeroization. - Enhanced reliability of cryptographic tests in OpenSSL, enabling safer deployments in production environments. Technologies/skills demonstrated: - OpenSSL codebase contributions in C, cryptographic protocol testing (PCT), test harness expansion, and memory security practices. - Debugging for complex crypto test failures, secure coding, and security-focused code review. - Cross-scheme testing coordination (ML-DSA, SLH-DSA, ML-KEM) and rigorous validation of test coverage.
October 2024
1 Commits
Oct 1, 2024Worked on 0 features and fixed 1 bugs across 1 repositories.
1 Commits
Oct 1, 2024Worked on 0 features and fixed 1 bugs across 1 repositories.
October 2024
Activity
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Quality Metrics
Correctness97.6%
Maintainability87.6%
Architecture95.0%
Performance82.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
CPerl
Technical Skills
C ProgrammingC programmingCryptographyEmbedded SystemsLow-level ProgrammingScriptingSecuritySecurity ComplianceTestingcryptographynetwork security
Repositories Contributed To
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