EXCEEDS logo
Exceeds
Paul Elliott

PROFILE

Paul Elliott

Worked across Mbed-TLS/mbedtls-framework, espressif/TF-PSA-Crypto, and openssl/openssl to deliver cryptographic features, performance optimizations, and stability improvements. Developed robust PSA key agreement workflows and interruptible operations in C, enhancing key management and testability for embedded systems. Improved memory safety, initialization order, and encapsulation, reducing race conditions and build failures. Expanded ARM platform support and optimized AES-GCM throughput for Neoverse CPUs using low-level programming and assembly. Addressed build issues for AArch64 PAC/BTI targets, ensuring reliable deployments. Demonstrated a methodical approach to code quality, cross-repository integration, and automated testing, with a focus on cryptography, performance, and maintainability.

Overall Statistics

Feature vs Bugs

68%Features

Repository Contributions

34Total
Bugs
6
Commits
34
Features
13
Lines of code
2,857
Activity Months7

Work History

December 2025

1 Commits

Dec 1, 2025

December 2025 monthly summary for openssl/openssl focusing on business value and technical achievements. No new features released this month; major stability improvement delivered for AArch64 PAC/BTI builds. The primary deliverable was a fix to a compiler error caused by an assembly section directive, ensuring secure and reliable builds on PAC/BTI-enabled AArch64 targets.

September 2025

1 Commits • 1 Features

Sep 1, 2025

Monthly summary for 2025-09 focusing on OpenSSL development and platform support. Key outcomes: Expanded ARM platform coverage with Arm V3_AE support and performance-oriented optimizations. This aligns OpenSSL with evolving ARM ecosystems and customer workloads, enabling faster cryptographic operations on eligible devices.

February 2025

1 Commits • 1 Features

Feb 1, 2025

February 2025 OpenSSL monthly summary focusing on performance optimization: Key feature delivered: AES-GCM performance optimization for ARM Neoverse N3 and V3, via architecture-specific unrolled paths implemented in armcap.c. Enabled unroll8/unroll12 to boost encryption/decryption throughput on affected CPUs. Commit: b6dceb36e8f46c7f74db5882322eda062227ab6e.

December 2024

9 Commits • 3 Features

Dec 1, 2024

Month: 2024-12 — Delivered stabilized testing infrastructure and expanded test coverage for critical cryptographic paths in Mbed-TLS and PSA Crypto. Key features include removal of non-thread-safe TSAN interruptible ECC tests, addition of a test for invalid IOP key type handling, initialization and state tests for interruptible IOP key agreement, and alignment of test code and submodule references with external repositories to enable negative testing. Also fixed a missing abort path at the end of IOP key agreement and updated the PSA framework to support negative testing. These changes reduce race-condition exposure, increase robustness of key agreement flows, and improve release confidence through stronger test automation and framework integration.

November 2024

6 Commits • 3 Features

Nov 1, 2024

November 2024 for Mbed-TLS/mbedtls-framework focused on hardening key agreement workflows: fixed a return-code handling bug, enabled export and validation of the generated key after successful key agreement, regenerated PSA Sim API headers and updated IO enums, and added restartable IOP key agreement support in PSA key exercise. These changes improve reliability, interoperability, and security posture, reduce test failures, and establish a solid foundation for production deployments.

October 2024

13 Commits • 3 Features

Oct 1, 2024

Month: 2024-10 This month delivered meaningful cryptography stabilization and foundational quality improvements across three repositories, driving reliability, security, and maintainability for production releases. Key work focused on stabilizing initialization order, hardening test suites against memory safety issues, and tightening code encapsulation for future maintainability.

September 2024

3 Commits • 2 Features

Sep 1, 2024

Month: 2024-09 — Key cryptographic capabilities delivered and reliability improvements across two PSA Crypto projects. In Mbed-TLS/mbedtls-framework, delivered PSA Key Agreement Enhancement with psa_key_agreement(), improving shared secret setup, key destruction, and failure handling to support more robust cryptographic workflows and security testing. In espressif/TF-PSA-Crypto, delivered PSA Key Agreement Interruptible Operation (IOP) for ECC, enabling non-blocking, responsive long-running key agreement processes with improved error handling. Together, these changes strengthen key management, reduce blocking, and improve testability and security posture for PSA crypto features.

Activity

Loading activity data...

Quality Metrics

Correctness90.0%
Maintainability90.6%
Architecture87.0%
Performance84.2%
AI Usage20.0%

Skills & Technologies

Programming Languages

CGitPerlShell

Technical Skills

API DesignAPI DevelopmentARM ArchitectureBuild SystemBuild SystemsCC ProgrammingC programmingCode RefactoringCompiler DirectivesCompiler WarningsConfiguration ManagementCryptographyDebuggingEmbedded C

Repositories Contributed To

4 repos

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

Mbed-TLS/mbedtls-framework

Sep 2024 Dec 2024
4 Months active

Languages Used

CPerlGitShell

Technical Skills

C programmingcryptographyembedded systemssoftware testingAPI DesignAPI Development

espressif/TF-PSA-Crypto

Sep 2024 Dec 2024
3 Months active

Languages Used

C

Technical Skills

C programmingcryptographyembedded systemsCC ProgrammingCode Refactoring

zephyrproject-rtos/mbedtls

Oct 2024 Oct 2024
1 Month active

Languages Used

C

Technical Skills

C ProgrammingC programmingCode RefactoringCompiler WarningsCryptographyDebugging

openssl/openssl

Feb 2025 Dec 2025
3 Months active

Languages Used

C

Technical Skills

ARM ArchitectureCryptographyPerformance Optimizationembedded systemslow-level programmingperformance optimization