openssl/openssl
Sep 2024 – Mar 2026
19 Months active
Languages Used
CPerlYAMLShellMakefileMarkdownPODText
Technical Skills
CC programmingQUIC protocol implementationSSL/TLS developmentconcurrency controlnetwork programming
Tomas Mraz
PROFILE
Tomas Mraz
Over 19 months, contributed to the openssl/openssl repository by delivering 53 features and resolving 51 bugs, focusing on cryptographic protocol reliability, security, and cross-platform maintainability. Work included enhancing TLS/QUIC integration, hardening memory management, and improving CI/CD automation for robust test coverage. Applied C and assembly language expertise to refactor core cryptographic routines, address memory-safety vulnerabilities, and streamline error handling. Improved Windows and ARM64 compatibility, implemented defensive programming for edge-case failures, and updated documentation to guide downstream adoption. The technical approach emphasized disciplined code review, thorough testing, and alignment with evolving security standards to support safer, more reliable deployments.
Overall Statistics
Feature vs Bugs
51%Features
Repository Contributions
168Total
Bugs
51
Commits
168
Features
53
Lines of code
8,888
Activity Months19
Your Network
380 peopleShared Repositories
365
Work History
March 2026
7 Commits • 3 Features
Mar 1, 2026March 2026 monthly summary focused on strengthening cryptographic policy controls, robustness, and PQC readiness for OpenSSL 4.0. Key outcomes include configurable cryptographic options, policy-consistent ECDH/ECDSA behavior under FIPS, robustness enhancements in ASN.1 string handling, PQC groundwork with ML-DSA assembly and updated FIPS checksums, expanded CI coverage for OpenSSL 4.0, and Windows build reliability improvements.
7 Commits • 3 Features
Mar 1, 2026March 2026 monthly summary focused on strengthening cryptographic policy controls, robustness, and PQC readiness for OpenSSL 4.0. Key outcomes include configurable cryptographic options, policy-consistent ECDH/ECDSA behavior under FIPS, robustness enhancements in ASN.1 string handling, PQC groundwork with ML-DSA assembly and updated FIPS checksums, expanded CI coverage for OpenSSL 4.0, and Windows build reliability improvements.
March 2026
February 2026
7 Commits • 2 Features
Feb 1, 2026February 2026: OpenSSL contributed reliability, maintainability, and value-driving improvements across X509 handling, error management, and test stability in the openssl/openssl repo. Delivered robust X509 extension handling with RFC3779 compatibility, cleaned up error reporting API, and strengthened test suites to ensure reliability when ciphers are disabled. These changes reduce runtime noise, improve correctness, and simplify ongoing maintenance for production deployments.
February 2026
7 Commits • 2 Features
Feb 1, 2026February 2026: OpenSSL contributed reliability, maintainability, and value-driving improvements across X509 handling, error management, and test stability in the openssl/openssl repo. Delivered robust X509 extension handling with RFC3779 compatibility, cleaned up error reporting API, and strengthened test suites to ensure reliability when ciphers are disabled. These changes reduce runtime noise, improve correctness, and simplify ongoing maintenance for production deployments.
January 2026
12 Commits • 3 Features
Jan 1, 2026January 2026 — OpenSSL (openssl/openssl) delivered focused security and reliability improvements across memory-safety hardening, cross-platform readiness, and test hygiene. Key changes include fixes to memory-safety defects and security vulnerabilities in PBMAC1 and RSA/OAEP paths, improved error handling and RFC-consistent behavior, performance-oriented refactors, and Windows-symbol exposure. Key accomplishments: - Security and memory-safety hardening: PBMAC1 salt type validation and key length enforcement addressing CVE-2025-11187; corrected alerting for extended master secret (EMS) drops; proper duplication in RSA and OAEP paths to prevent UAF/double-free; NULL current_crl handling; fixed error code collisions. - Regression and tests: Added regression test for PKCS12 with invalid PBMAC1 key length; expanded coverage around critical edge cases. - Base64 improvements: Refactored encoding for predictable lengths and performance; aligned SIMD UTF base64 tests naming. - Windows platform compatibility: Added WSAIoctl to allowed Windows platform symbols to improve compatibility. - Documentation/test hygiene: Fixed documentation typo related to CVE-2019-1551 to ensure accurate references. Overall impact: - Strengthened security posture with robust memory-safety and RFC-aligned error handling; reduced risk of UAF/double-free vulnerabilities; improved cross-platform behavior and test reliability. These changes support safer deployments and quicker remediation in response to CVEs and RFC updates. Technologies/skills demonstrated: - C-level security hardening, ASN.1 handling, memory management, cross-platform development (Windows), base64 algorithm tuning, regression testing, and documentation quality control.
12 Commits • 3 Features
Jan 1, 2026January 2026 — OpenSSL (openssl/openssl) delivered focused security and reliability improvements across memory-safety hardening, cross-platform readiness, and test hygiene. Key changes include fixes to memory-safety defects and security vulnerabilities in PBMAC1 and RSA/OAEP paths, improved error handling and RFC-consistent behavior, performance-oriented refactors, and Windows-symbol exposure. Key accomplishments: - Security and memory-safety hardening: PBMAC1 salt type validation and key length enforcement addressing CVE-2025-11187; corrected alerting for extended master secret (EMS) drops; proper duplication in RSA and OAEP paths to prevent UAF/double-free; NULL current_crl handling; fixed error code collisions. - Regression and tests: Added regression test for PKCS12 with invalid PBMAC1 key length; expanded coverage around critical edge cases. - Base64 improvements: Refactored encoding for predictable lengths and performance; aligned SIMD UTF base64 tests naming. - Windows platform compatibility: Added WSAIoctl to allowed Windows platform symbols to improve compatibility. - Documentation/test hygiene: Fixed documentation typo related to CVE-2019-1551 to ensure accurate references. Overall impact: - Strengthened security posture with robust memory-safety and RFC-aligned error handling; reduced risk of UAF/double-free vulnerabilities; improved cross-platform behavior and test reliability. These changes support safer deployments and quicker remediation in response to CVEs and RFC updates. Technologies/skills demonstrated: - C-level security hardening, ASN.1 handling, memory management, cross-platform development (Windows), base64 algorithm tuning, regression testing, and documentation quality control.
January 2026
December 2025
8 Commits • 4 Features
Dec 1, 2025December 2025 highlights a focused set of reliability, security, and CI improvements across the OpenSSL project, delivering tangible business value through more stable runtime behavior, stronger security posture, and streamlined build processes. The work demonstrates disciplined maintenance, security-first fixes, and architecture-aware refactoring that improves context management and platform hygiene.
December 2025
8 Commits • 4 Features
Dec 1, 2025December 2025 highlights a focused set of reliability, security, and CI improvements across the OpenSSL project, delivering tangible business value through more stable runtime behavior, stronger security posture, and streamlined build processes. The work demonstrates disciplined maintenance, security-first fixes, and architecture-aware refactoring that improves context management and platform hygiene.
November 2025
9 Commits
Nov 1, 2025Month 2025-11: Strengthened OpenSSL robustness, safety, and test reliability across core components. Delivered targeted fixes and feature work that reduce risk in UTF-8 processing, PKCS#12 handling, CMS/SSL test stability, and OCSP/CRL behavior, with measurable improvements to CI reliability and downstream security posture. This work emphasizes business value: fewer regressions, clearer error paths, and consistent behavior across configurations.
9 Commits
Nov 1, 2025Month 2025-11: Strengthened OpenSSL robustness, safety, and test reliability across core components. Delivered targeted fixes and feature work that reduce risk in UTF-8 processing, PKCS#12 handling, CMS/SSL test stability, and OCSP/CRL behavior, with measurable improvements to CI reliability and downstream security posture. This work emphasizes business value: fewer regressions, clearer error paths, and consistent behavior across configurations.
November 2025
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
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.
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
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.
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.
September 2024
5 Commits • 1 Features
Sep 1, 2024September 2024 performance highlights for openssl/openssl. Delivered key QUIC integration and networking reliability improvements that strengthen security, performance, and maintainability of the TLS stack and associated networking components. Key features delivered: - QUIC Polling Subsystem Enhancements: Improved immediate-mode polling for QUIC connections, with better SSL object handling, enhanced polling integration, and updated tests and documentation. Major bugs fixed: - Networking Reliability Improvements: Fixed networking component reliability issues, including enhanced error handling in the RIO notifier socket initialization and ensuring Windows Sockets API is initialized before use. Overall impact and accomplishments: - Improved connectivity reliability and resilience in QUIC-enabled workflows, reducing edge-case failures and improving diagnosability through clearer error messages and updated tests/docs. - Strengthened code quality and maintainability with targeted fixes and better initialization checks across platforms. Technologies/skills demonstrated: - C, OpenSSL internals, QUIC integration, Windows sockets initialization, robust error handling, and test/documentation coverage.
5 Commits • 1 Features
Sep 1, 2024September 2024 performance highlights for openssl/openssl. Delivered key QUIC integration and networking reliability improvements that strengthen security, performance, and maintainability of the TLS stack and associated networking components. Key features delivered: - QUIC Polling Subsystem Enhancements: Improved immediate-mode polling for QUIC connections, with better SSL object handling, enhanced polling integration, and updated tests and documentation. Major bugs fixed: - Networking Reliability Improvements: Fixed networking component reliability issues, including enhanced error handling in the RIO notifier socket initialization and ensuring Windows Sockets API is initialized before use. Overall impact and accomplishments: - Improved connectivity reliability and resilience in QUIC-enabled workflows, reducing edge-case failures and improving diagnosability through clearer error messages and updated tests/docs. - Strengthened code quality and maintainability with targeted fixes and better initialization checks across platforms. Technologies/skills demonstrated: - C, OpenSSL internals, QUIC integration, Windows sockets initialization, robust error handling, and test/documentation coverage.
September 2024
Activity
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Quality Metrics
Correctness94.8%
Maintainability92.0%
Architecture90.8%
Performance88.2%
AI Usage20.2%
Skills & Technologies
Programming Languages
AssemblyCMakefileMarkdownPODPerlShellTextYAMLplaintext
Technical Skills
API GuidanceAPI designAPI developmentBug FixBug FixingBug fixingBuild System ConfigurationBuild SystemsBuild system configurationBuild systemsCC ProgrammingC programmingCI/CDCI/CD Configuration
Repositories Contributed To
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