openssl/openssl
Sep 2025 – Oct 2025
2 Months active
Languages Used
C
Technical Skills
API designC programmingCryptographySecurityTestingC Development
Daniel Kubec
PROFILE
Daniel Kubec
Kubec worked on the openssl/openssl repository, focusing on security and reliability improvements in cryptographic decryption routines. Over two months, Kubec addressed edge-case vulnerabilities by enforcing strict authentication tag requirements for AEAD ciphers such as ChaCha20-Poly1305, CCM, and GCM, ensuring decryption fails when tags are missing. Using C and OpenSSL EVP APIs, Kubec implemented robust error handling in EVP_DecryptFinal_ex() and expanded regression test coverage to validate these changes. This work reduced the risk of insecure decryption pathways and improved cryptographic correctness, demonstrating depth in C programming, cryptography, and security-focused debugging within a widely used open-source codebase.
Overall Statistics
Feature vs Bugs
0%Features
Repository Contributions
3Total
Bugs
3
Commits
3
Features
0
Lines of code
214
Activity Months2
Your Network
238 people
Work History
October 2025
1 Commits
Oct 1, 2025October 2025 monthly summary for openssl/openssl focused on security hardening of AEAD decryption. Implemented enforcement of a valid authentication tag before decryption for ChaCha20-Poly1305, CCM, and GCM, improving resistance to tag-less decryption attempts and aligning with authenticated encryption best practices. Added robust error handling so EVP_DecryptFinal_ex() raises an error when the tag is not set, preventing insecure decryption pathways.
1 Commits
Oct 1, 2025October 2025 monthly summary for openssl/openssl focused on security hardening of AEAD decryption. Implemented enforcement of a valid authentication tag before decryption for ChaCha20-Poly1305, CCM, and GCM, improving resistance to tag-less decryption attempts and aligning with authenticated encryption best practices. Added robust error handling so EVP_DecryptFinal_ex() raises an error when the tag is not set, preventing insecure decryption pathways.
October 2025
September 2025
2 Commits
Sep 1, 2025September 2025 (openssl/openssl): Security and reliability improvements focused on edge-case handling and cryptographic correctness, backed by regression tests. Key commits include 051108ee53d5b0ff5a125d32acfbc7e20899b022 (EVP_PKEY_can_sign() NULL handling) and 6387ec6d492caffa4c9bc137f1cb6c171366c7c7 (ChaCha20-Poly1305 decryption when the tag is missing). Key features delivered: none user-facing; major impact comes from correctness and security hardening. Major bugs fixed: EVP_PKEY_can_sign() path handling with NULL query result; ChaCha20-Poly1305 decryption behavior when tag is missing, aligning with AES-GCM. Overall impact: reduces cryptographic edge-case risk, improves test coverage and release confidence. Technologies/skills demonstrated: C, OpenSSL EVP APIs, regression testing, security-focused debugging and verification.
September 2025
2 Commits
Sep 1, 2025September 2025 (openssl/openssl): Security and reliability improvements focused on edge-case handling and cryptographic correctness, backed by regression tests. Key commits include 051108ee53d5b0ff5a125d32acfbc7e20899b022 (EVP_PKEY_can_sign() NULL handling) and 6387ec6d492caffa4c9bc137f1cb6c171366c7c7 (ChaCha20-Poly1305 decryption when the tag is missing). Key features delivered: none user-facing; major impact comes from correctness and security hardening. Major bugs fixed: EVP_PKEY_can_sign() path handling with NULL query result; ChaCha20-Poly1305 decryption behavior when tag is missing, aligning with AES-GCM. Overall impact: reduces cryptographic edge-case risk, improves test coverage and release confidence. Technologies/skills demonstrated: C, OpenSSL EVP APIs, regression testing, security-focused debugging and verification.
Activity
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Quality Metrics
Correctness100.0%
Maintainability93.4%
Architecture93.4%
Performance100.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
C
Technical Skills
API designC DevelopmentC programmingCryptographySecurityTesting
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