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Billy Brumley

PROFILE

Billy Brumley

Worked on cryptographic libraries, focusing on correctness, performance, and cross-platform compatibility. In openssl/openssl, addressed RFC 8452 compliance for AES-GCM-SIV by refining zero-length message handling, aligning both software and hardware input validation, and expanding regression tests to ensure robust edge-case support. Later, optimized elliptic curve computations by reducing unnecessary field inversions, improving throughput for key operations. In open-quantum-safe/liboqs, replaced the PQClean SNTRUP761 implementation with a public-domain OpenSSH version, updating licensing, documentation, and build scripts for broader platform support. Used C and Python, emphasizing algorithm implementation, cryptography, documentation, and open-source compliance throughout the development process.

Overall Statistics

Feature vs Bugs

67%Features

Repository Contributions

3Total
Bugs
1
Commits
3
Features
2
Lines of code
11,988
Activity Months3

Work History

April 2026

1 Commits • 1 Features

Apr 1, 2026

In April 2026, the liboqs project delivered a major feature upgrade for SNTRUP761 by replacing the PQClean implementation with a public-domain OpenSSH version, driving cross-platform compatibility and easier maintenance. The change touched core KEM code and required updates to licensing, documentation, and build behavior to support Android and MSVC toolchains. Additional compatibility fixes included making VLA handling portable (alloca usage and __builtin_alloca fallback), as well as explicit_bzero adjustments. Extended tests were added (CT exception for rejection sampling) and upstream alignment efforts were strengthened through code ownership updates and co-authored commits. Overall, this work reduces dependency risk, improves portability, and demonstrates strong cross-platform engineering and adherence to open-source standards.

March 2026

1 Commits • 1 Features

Mar 1, 2026

March 2026: OpenSSL ECC performance optimization and code quality improvements in openssl/openssl. Focused on reducing computational cost in elliptic curve operations and delivering business value for key loading, serialization, and cryptographic workloads.

January 2025

1 Commits

Jan 1, 2025

January 2025 focused on correctness and RFC compliance for AES-GCM-SIV in openssl/openssl. Implemented a critical fix for zero-length message handling per RFC 8452, aligned both software and hardware input validations, and expanded test coverage to prevent regressions. The changes enhance interoperability, security, and reliability for edge-case inputs in AES-GCM-SIV implementations.

Activity

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Quality Metrics

Correctness100.0%
Maintainability86.6%
Architecture93.4%
Performance86.6%
AI Usage26.6%

Skills & Technologies

Programming Languages

CPython

Technical Skills

Algorithm implementationC programmingCryptographycryptographydocumentationopen-source complianceperformance optimization

Repositories Contributed To

2 repos

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

openssl/openssl

Jan 2025 Mar 2026
2 Months active

Languages Used

C

Technical Skills

Algorithm implementationC programmingCryptographycryptographyperformance optimization

open-quantum-safe/liboqs

Apr 2026 Apr 2026
1 Month active

Languages Used

CPython

Technical Skills

C programmingcryptographydocumentationopen-source compliance