openssl/openssl
Oct 2024 – Oct 2025
13 Months active
Languages Used
CPerlYAMLShellMakefileMarkdownPODText
Technical Skills
C ProgrammingC programmingCode analysisCryptographyPerformance TestingScripting
Tomas Mraz
PROFILE
Tomas Mraz
Tomas contributed to the openssl/openssl repository by engineering robust cryptographic features and resolving complex bugs across core security, networking, and build systems. He enhanced cross-platform stability, memory management, and test automation, often refactoring C code to improve maintainability and prevent resource leaks. His work included hardening cryptographic protocol handling, optimizing CI/CD pipelines, and addressing vulnerabilities such as double-free and buffer overread issues. Tomas applied defensive programming and conditional compilation to ensure compatibility and security across diverse environments. By updating documentation and enforcing policy correctness, he enabled safer deployments and streamlined development, demonstrating depth in C programming, OpenSSL internals, and CI workflows.
Overall Statistics
Feature vs Bugs
51%Features
Repository Contributions
120Total
Bugs
38
Commits
120
Features
40
Lines of code
6,661
Activity Months13
Your Network
238 people
Work History
October 2025
3 Commits
Oct 1, 2025October 2025 monthly summary for repository openssl/openssl. Focused on security hardening and build/config correctness across networking and crypto paths. Delivered two critical bug fixes and strengthened policy enforcement, with clear, auditable commits and improved maintainability.
3 Commits
Oct 1, 2025October 2025 monthly summary for repository openssl/openssl. Focused on security hardening and build/config correctness across networking and crypto paths. Delivered two critical bug fixes and strengthened policy enforcement, with clear, auditable commits and improved maintainability.
October 2025
September 2025
12 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for openssl/openssl: Delivered interoperability and packaging enhancements enabling co-existence of multiple OpenSSL versions alongside interop testing, implemented targeted security and correctness fixes across crypto and HTTP layers, strengthened KRB5KDF error handling with dedicated tests, and improved release efficiency through CI gating and updated documentation. Overall, these efforts improved deployment flexibility, security posture, and release reliability while reducing maintenance risk.
September 2025
12 Commits • 4 Features
Sep 1, 2025September 2025 monthly summary for openssl/openssl: Delivered interoperability and packaging enhancements enabling co-existence of multiple OpenSSL versions alongside interop testing, implemented targeted security and correctness fixes across crypto and HTTP layers, strengthened KRB5KDF error handling with dedicated tests, and improved release efficiency through CI gating and updated documentation. Overall, these efforts improved deployment flexibility, security posture, and release reliability while reducing maintenance risk.
August 2025
1 Commits
Aug 1, 2025August 2025 monthly summary for openssl/openssl: Delivered a critical memory-management fix addressing an OCSP double-free vulnerability, improving runtime stability and security of OCSP handling. The fix ensures OCSP_SINGLERESP can be safely referenced by OCSP_BASICRESP without risking a double-free.
1 Commits
Aug 1, 2025August 2025 monthly summary for openssl/openssl: Delivered a critical memory-management fix addressing an OCSP double-free vulnerability, improving runtime stability and security of OCSP handling. The fix ensures OCSP_SINGLERESP can be safely referenced by OCSP_BASICRESP without risking a double-free.
August 2025
July 2025
7 Commits • 4 Features
Jul 1, 2025Month: 2025-07 | Repository: openssl/openssl | Focus: CI automation, security/robustness improvements, and performance across backport workflow, cryptographic protocol handling, test stability, and DRBG efficiency.
July 2025
7 Commits • 4 Features
Jul 1, 2025Month: 2025-07 | Repository: openssl/openssl | Focus: CI automation, security/robustness improvements, and performance across backport workflow, cryptographic protocol handling, test stability, and DRBG efficiency.
June 2025
14 Commits • 2 Features
Jun 1, 2025Monthly summary for 2025-06 focused on delivering business value through cross-platform stability, robust memory management, and improved CI hygiene. Highlights below align with OpenSSL Open Source project priorities and performance review expectations. Key features delivered: - Windows 64-bit compatibility and build warning cleanups: Implemented across core, SSL/TLS, fuzzing, tests, demos, and config to improve cross-platform stability for Win64 builds (9 commits across libapps, libcrypto, providers, libssl, engines, apps, fuzz, test, and demos; plus an allowance for Windows symbol handling). - Documentation and deprecation guidance updates: Refined PEM and key handling guidance and corrected deprecation notices and internal docs (2 commits). - CI Windows build quality improvements: Enabled strict warning flags in Windows CI configurations to identify issues earlier (1 commit). Major bugs fixed: - Double-free and memory leak in EVP_PKEY export: Fixed double-free vulnerability and memory leak to ensure proper resource management and prevent crashes (evp_extra_test2.c; 1 commit). - Init_master_key thread-local init check: Guarded init_master_key against failed CRYPTO_THREAD_init_local calls to prevent misbehavior when thread-local initialization fails (1 commit). Overall impact and accomplishments: - Significantly improved Windows stability and reliability for OpenSSL on 64-bit platforms, reducing support incidents and enabling more predictable builds in Windows environments. - Strengthened security/posture by eliminating resource management vulnerabilities in EVP_PKEY export, contributing to safer key handling workflows. - Increased build confidence and faster triage through stricter CI checks, catching issues earlier in the development lifecycle. - Documentation accuracy and API guidance alignment help downstream developers and integrations to adopt recommended practices with fewer deprecation surprises. Technologies/skills demonstrated: - Cross-platform build hygiene, compiler warning management, and Windows-specific integration. - Memory management, including double-free and leak prevention in cryptographic key export flows. - Thread-local initialization safety patterns and defensive checks against initialization failures. - Documentation governance and API deprecation guidance. - CI/CD discipline and automated quality gates for Windows environments.
14 Commits • 2 Features
Jun 1, 2025Monthly summary for 2025-06 focused on delivering business value through cross-platform stability, robust memory management, and improved CI hygiene. Highlights below align with OpenSSL Open Source project priorities and performance review expectations. Key features delivered: - Windows 64-bit compatibility and build warning cleanups: Implemented across core, SSL/TLS, fuzzing, tests, demos, and config to improve cross-platform stability for Win64 builds (9 commits across libapps, libcrypto, providers, libssl, engines, apps, fuzz, test, and demos; plus an allowance for Windows symbol handling). - Documentation and deprecation guidance updates: Refined PEM and key handling guidance and corrected deprecation notices and internal docs (2 commits). - CI Windows build quality improvements: Enabled strict warning flags in Windows CI configurations to identify issues earlier (1 commit). Major bugs fixed: - Double-free and memory leak in EVP_PKEY export: Fixed double-free vulnerability and memory leak to ensure proper resource management and prevent crashes (evp_extra_test2.c; 1 commit). - Init_master_key thread-local init check: Guarded init_master_key against failed CRYPTO_THREAD_init_local calls to prevent misbehavior when thread-local initialization fails (1 commit). Overall impact and accomplishments: - Significantly improved Windows stability and reliability for OpenSSL on 64-bit platforms, reducing support incidents and enabling more predictable builds in Windows environments. - Strengthened security/posture by eliminating resource management vulnerabilities in EVP_PKEY export, contributing to safer key handling workflows. - Increased build confidence and faster triage through stricter CI checks, catching issues earlier in the development lifecycle. - Documentation accuracy and API guidance alignment help downstream developers and integrations to adopt recommended practices with fewer deprecation surprises. Technologies/skills demonstrated: - Cross-platform build hygiene, compiler warning management, and Windows-specific integration. - Memory management, including double-free and leak prevention in cryptographic key export flows. - Thread-local initialization safety patterns and defensive checks against initialization failures. - Documentation governance and API deprecation guidance. - CI/CD discipline and automated quality gates for Windows environments.
June 2025
May 2025
4 Commits • 2 Features
May 1, 2025May 2025 monthly summary: OpenSSL repository focused on security, stability, and clarity across core crypto paths. Delivered critical CVE remediation, improved resource management, and enhanced observability and documentation to support reliable deployments in multi-instance environments.
May 2025
4 Commits • 2 Features
May 1, 2025May 2025 monthly summary: OpenSSL repository focused on security, stability, and clarity across core crypto paths. Delivered critical CVE remediation, improved resource management, and enhanced observability and documentation to support reliable deployments in multi-instance environments.
April 2025
5 Commits • 1 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for openssl/openssl focusing on reliability, compatibility, and maintainability. Delivered targeted fixes to improve FIPS provider test compatibility, robustness of utility output, and C compatibility in demos; completed memory management cleanup to prevent leaks and dead code issues. These changes reduce risk in provider updates, improve test coverage, and align code paths with contemporary C standards.
5 Commits • 1 Features
Apr 1, 2025April 2025 (2025-04) monthly summary for openssl/openssl focusing on reliability, compatibility, and maintainability. Delivered targeted fixes to improve FIPS provider test compatibility, robustness of utility output, and C compatibility in demos; completed memory management cleanup to prevent leaks and dead code issues. These changes reduce risk in provider updates, improve test coverage, and align code paths with contemporary C standards.
April 2025
March 2025
10 Commits • 5 Features
Mar 1, 2025March 2025: OpenSSL work focused on delivering signing flexibility, stability, and release readiness for OpenSSL 3.5, with targeted feature enhancements, bug fixes, and expanded test coverage. Key outcomes include enabling ECDSA signing with digests without a registered NID in the default provider, fixing peer retention during EVP_PKEY derive, correcting qlog packet processing logic, expanding CI to test against OpenSSL 3.5 and align providers, and adding KECCAK-256 initialization tests to ensure correct hashing integration. Documentation and release notes were updated to reflect ML-KEM parameter description and 3.5 changes, supporting a smoother release.
March 2025
10 Commits • 5 Features
Mar 1, 2025March 2025: OpenSSL work focused on delivering signing flexibility, stability, and release readiness for OpenSSL 3.5, with targeted feature enhancements, bug fixes, and expanded test coverage. Key outcomes include enabling ECDSA signing with digests without a registered NID in the default provider, fixing peer retention during EVP_PKEY derive, correcting qlog packet processing logic, expanding CI to test against OpenSSL 3.5 and align providers, and adding KECCAK-256 initialization tests to ensure correct hashing integration. Documentation and release notes were updated to reflect ML-KEM parameter description and 3.5 changes, supporting a smoother release.
February 2025
21 Commits • 10 Features
Feb 1, 2025February 2025 monthly summary for openssl/openssl: Delivered targeted features and critical bug fixes, improving maintainability, security posture, and test parity across TLS/QUIC configurations, while strengthening FIPS module stability and memory-management compatibility. Key deliverables include EVP_SKEY initialization refactor, enabling DHE with TLS-1.2 and older versions in tests, and aligning default TLS/QUIC group lists. Major bugs fixed include replacing strdup with OPENSSL_strdup in ossl_rand_ctx_new and removing BIO_printf() calls from the FIPS_MODULE.
21 Commits • 10 Features
Feb 1, 2025February 2025 monthly summary for openssl/openssl: Delivered targeted features and critical bug fixes, improving maintainability, security posture, and test parity across TLS/QUIC configurations, while strengthening FIPS module stability and memory-management compatibility. Key deliverables include EVP_SKEY initialization refactor, enabling DHE with TLS-1.2 and older versions in tests, and aligning default TLS/QUIC group lists. Major bugs fixed include replacing strdup with OPENSSL_strdup in ossl_rand_ctx_new and removing BIO_printf() calls from the FIPS_MODULE.
February 2025
January 2025
23 Commits • 7 Features
Jan 1, 2025January 2025: Stabilized CI and test workflows, hardened memory safety, mitigated ECDSA timing side-channel risk, expanded KDF/KEM test coverage, and refreshed ecosystem components (ML-KEM aliases, OQS-provider, CVE disclosures) with QUIC server scaffolding improvements. These changes reduce production risk and enable safer, faster releases.
January 2025
23 Commits • 7 Features
Jan 1, 2025January 2025: Stabilized CI and test workflows, hardened memory safety, mitigated ECDSA timing side-channel risk, expanded KDF/KEM test coverage, and refreshed ecosystem components (ML-KEM aliases, OQS-provider, CVE disclosures) with QUIC server scaffolding improvements. These changes reduce production risk and enable safer, faster releases.
December 2024
10 Commits • 3 Features
Dec 1, 2024December 2024 performance highlights for openssl/openssl: delivered stability, safety, and performance improvements across CMS handling, entropy pool management, platform compatibility, and CI processes. Key outcomes include targeted bug fixes that remove unstable behavior and memory-safety risks, plus new entropy APIs that strengthen randomness quality and resistance to external input. These changes reduce risk in cryptographic workflows, improve cross‑platform reliability on ARM64_32 and Windows, and accelerate feedback via streamlined CI pipelines. Technologies demonstrated include C memory management, error handling, reference counting, RAND_POOL entropy handling, OPENSSL_STRING usage, and CI/CD optimization.
10 Commits • 3 Features
Dec 1, 2024December 2024 performance highlights for openssl/openssl: delivered stability, safety, and performance improvements across CMS handling, entropy pool management, platform compatibility, and CI processes. Key outcomes include targeted bug fixes that remove unstable behavior and memory-safety risks, plus new entropy APIs that strengthen randomness quality and resistance to external input. These changes reduce risk in cryptographic workflows, improve cross‑platform reliability on ARM64_32 and Windows, and accelerate feedback via streamlined CI pipelines. Technologies demonstrated include C memory management, error handling, reference counting, RAND_POOL entropy handling, OPENSSL_STRING usage, and CI/CD optimization.
December 2024
November 2024
7 Commits • 1 Features
Nov 1, 2024November 2024: Focused on reliability, safety, and maintainability for the OpenSSL project. Key efforts included stabilizing interop test infrastructure, hardening crypto components, deprecating unsafe BIO APIs, and improving CI labeling to reflect ABI changes. Delivered results include more reliable cross-platform tests, more robust crypto paths, safer code maintenance, and clearer build signals that reduce downstream risk for users and downstream consumers.
November 2024
7 Commits • 1 Features
Nov 1, 2024November 2024: Focused on reliability, safety, and maintainability for the OpenSSL project. Key efforts included stabilizing interop test infrastructure, hardening crypto components, deprecating unsafe BIO APIs, and improving CI labeling to reflect ABI changes. Delivered results include more reliable cross-platform tests, more robust crypto paths, safer code maintenance, and clearer build signals that reduce downstream risk for users and downstream consumers.
October 2024
3 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for openssl/openssl focusing on performance testing and benchmarking robustness. Key work centered on hardening the speed test suite and enforcing input validation to prevent architecture-specific crashes and runtime errors, thereby improving reliability and the integrity of performance measurements across platforms.
3 Commits • 1 Features
Oct 1, 2024October 2024 monthly summary for openssl/openssl focusing on performance testing and benchmarking robustness. Key work centered on hardening the speed test suite and enforcing input validation to prevent architecture-specific crashes and runtime errors, thereby improving reliability and the integrity of performance measurements across platforms.
October 2024
Activity
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Quality Metrics
Correctness93.2%
Maintainability92.2%
Architecture89.0%
Performance86.6%
AI Usage20.0%
Skills & Technologies
Programming Languages
CMakefileMarkdownPODPerlShellTextYAML
Technical Skills
API GuidanceAPI designAPI developmentBug FixBug FixingBug fixingBuild System ConfigurationBuild SystemsBuild system configurationBuild systemsC ProgrammingC programmingCI/CDCI/CD ConfigurationCode Analysis
Repositories Contributed To
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