openssl/openssl
Mar 2026 – Apr 2026
2 Months active
Languages Used
CMarkdownPerl
Technical Skills
C programmingbuffer managementnetwork programmingnetwork securitysecuritysecurity best practices
Matt Caswell
PROFILE
Matt Caswell
Worked on the openssl/openssl repository to enhance the security and reliability of TLS and DTLS protocol implementations. Focused on memory safety and protocol robustness, this developer addressed buffer overflows and use-after-free vulnerabilities in C, improving s_client and DTLS handling. They introduced a comprehensive test suite for DTLS ChangeCipherSpec messages, ensuring resilience against unexpected input. Additionally, they clarified handshake API usage and improved documentation in Markdown, while stabilizing protocol tests for environments lacking DTLS 1.2. Security hardening extended to TLS 1.3 PSK handling, with new limits and tests to defend against unauthenticated clients, reflecting a thorough approach to secure communications.
Overall Statistics
Feature vs Bugs
43%Features
Repository Contributions
9Total
Bugs
4
Commits
9
Features
3
Lines of code
262
Activity Months2
Your Network
368 peopleSame Organization
@openssl.foundation3
Shared Repositories
365
Work History
April 2026
6 Commits • 2 Features
Apr 1, 2026Month 2026-04 summary focusing on API clarity, security hardening, and stability across TLS/DTLS workflows in openssl/openssl. Key contributions corrected changelog documentation, clarified set_session_id_context usage with warnings about late in handshake, stabilized DTLS-related tests in environments without DTLS 1.2, fixed security-related issues in s_client STARTTLS, and hardened TLS 1.3 PSK handling with added tests. Result: improved developer experience, reduced test instability, and strengthened defense against PSK-based and STARTTLS-related vectors, delivering measurable business value through more robust and reliable secure communications.
6 Commits • 2 Features
Apr 1, 2026Month 2026-04 summary focusing on API clarity, security hardening, and stability across TLS/DTLS workflows in openssl/openssl. Key contributions corrected changelog documentation, clarified set_session_id_context usage with warnings about late in handshake, stabilized DTLS-related tests in environments without DTLS 1.2, fixed security-related issues in s_client STARTTLS, and hardened TLS 1.3 PSK handling with added tests. Result: improved developer experience, reduced test instability, and strengthened defense against PSK-based and STARTTLS-related vectors, delivering measurable business value through more robust and reliable secure communications.
April 2026
March 2026
3 Commits • 1 Features
Mar 1, 2026In March 2026, the openssl/openssl work focused on reinforcing DTLS robustness and memory safety, with targeted fixes and a new test suite that reduces risk and improves reliability in production deployments.
March 2026
3 Commits • 1 Features
Mar 1, 2026In March 2026, the openssl/openssl work focused on reinforcing DTLS robustness and memory safety, with targeted fixes and a new test suite that reduces risk and improves reliability in production deployments.
Activity
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Quality Metrics
Correctness100.0%
Maintainability93.2%
Architecture97.8%
Performance93.2%
AI Usage20.0%
Skills & Technologies
Programming Languages
CMarkdownPerl
Technical Skills
C programmingPerl scriptingSSL/TLSTLSbuffer managementcryptographydocumentationnetwork programmingnetwork protocolsnetwork securityprotocol developmentsecuritysecurity best practicessecurity hardeningsystem programming
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline