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Krzysztof Wicher

PROFILE

Krzysztof Wicher

Worked on cryptographic and API enhancements in the dotnet/runtime repository, focusing on secure key management, post-quantum cryptography, and performance improvements. Delivered features such as ML-DSA support in COSE for signing and verification, hardware-backed TLS integration with TPM keys, and a memory-efficient ReadOnlySpan<byte> constructor for CngProperty. Leveraged C#, C++, and OpenSSL to implement native interoperability, refactor cryptographic APIs, and expand test coverage for reliability. Also contributed to dotnet-api-docs by clarifying JScriptEvaluate documentation, improving developer onboarding. The work emphasized robust cryptographic workflows, efficient system programming, and clear documentation, demonstrating depth in backend development and cryptography API design.

Overall Statistics

Feature vs Bugs

100%Features

Repository Contributions

8Total
Bugs
0
Commits
8
Features
6
Lines of code
13,552
Activity Months5

Your Network

5320 people

Work History

March 2026

1 Commits • 1 Features

Mar 1, 2026

March 2026: Delivered a memory-efficient ReadOnlySpan<byte> constructor for CngProperty in the dotnet/runtime API, with full unit tests and integration validation. This change reduces allocations in cryptographic property handling and improves runtime performance. No major bugs fixed this month. Overall impact includes stronger API performance, reliability, and measurable efficiency gains in crypto workflows. Technologies demonstrated include ReadOnlySpan<byte>, API design, unit testing, and integration with existing CNG components.

July 2025

2 Commits • 1 Features

Jul 1, 2025

July 2025: Delivered ML-DSA API enhancements in dotnet/runtime introducing byte-array APIs and Pre-hash support, enabling more flexible and secure cryptographic workflows for signatures and pre-hashed data. The work includes API refactors, input validation improvements, and expanded test coverage to ensure reliability across cryptographic paths.

June 2025

2 Commits • 1 Features

Jun 1, 2025

June 2025: Implemented ML-DSA support in COSE for signing and verification in dotnet/runtime, stabilized end-to-end ML-DSA workflows, and strengthened testing infrastructure. Refactored core components to support multiple key types/algorithms and resolved build issues related to cryptography usage, enabling more reliable ML-DSA workflows and broader security capabilities.

April 2025

1 Commits • 1 Features

Apr 1, 2025

April 2025 monthly summary focusing on improving JScriptEvaluate documentation in dotnet-api-docs to enhance developer understanding and reduce support overhead. The work aligns with ongoing standards for API documentation quality and contributes to faster onboarding for .NET developers using JScriptEvaluate.

March 2025

2 Commits • 2 Features

Mar 1, 2025

March 2025 (repo filipnavara/runtime) delivered security-focused feature work and PQC groundwork with a clear path to OpenSSL interoperability across languages. Key features delivered include TLS with TPM Key Support and OpenSSL Compatibility, and ML-DSA Post-Quantum Cryptography Support (OpenSSL Integration). Major bugs fixed include correcting providers EC export and key derivation for newer OpenSSL and adding TLS with TPM keys tests to prevent regressions. Overall impact: strengthened cryptographic security posture through hardware-backed TLS and PQC groundwork, improved cross-version OpenSSL compatibility, and established multi-language interop with C/C++ and C# wrappers. Technologies demonstrated: OpenSSL cryptography, TPM integration, cross-language native interop, cryptographic key management, and test automation.

Activity

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Quality Metrics

Correctness95.0%
Maintainability95.0%
Architecture95.0%
Performance87.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

CC#C++HaskellMarkdownXML

Technical Skills

.NET LibrariesAPI DesignC#C# DevelopmentC/C++ DevelopmentCOSECryptographyCryptography API DesignDigital SignaturesDocumentationLow-Level InteropML-DSANative InteropNative InteroperabilityOpenSSL Integration

Repositories Contributed To

3 repos

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

dotnet/runtime

Jun 2025 Mar 2026
3 Months active

Languages Used

C#XML

Technical Skills

.NET LibrariesAPI DesignCOSECryptographyDigital SignaturesML-DSA

filipnavara/runtime

Mar 2025 Mar 2025
1 Month active

Languages Used

CC#C++Haskell

Technical Skills

C# DevelopmentC/C++ DevelopmentCryptographyCryptography API DesignNative InteropNative Interoperability

dotnet/dotnet-api-docs

Apr 2025 Apr 2025
1 Month active

Languages Used

Markdown

Technical Skills

Documentation