zephyrproject-rtos/trusted-firmware-m
Nov 2024 – Aug 2025
6 Months active
Languages Used
CCMakePythonC++RSTShellccmake
Technical Skills
Bootloader DevelopmentBuild SystemsC ProgrammingCMakeConfiguration ManagementCryptography
Raef Coles
PROFILE
Raef Coles
Raef Coles developed and enhanced security-critical features for the zephyrproject-rtos/trusted-firmware-m repository, focusing on secure boot, provisioning, and cryptographic robustness. He engineered tamper detection and permanent disablement mechanisms for Remote Secure Element provisioning, implemented post-quantum cryptography support, and improved error handling and memory efficiency in embedded firmware. Using C, Python, and CMake, Raef addressed low-level driver development, build system configuration, and platform integration for new hardware. His work emphasized traceable, auditable workflows and robust device integrity, delivering maintainable solutions that strengthened supply chain trust and platform reliability. The depth of his contributions reflects strong embedded systems and security expertise.
Overall Statistics
Feature vs Bugs
78%Features
Repository Contributions
51Total
Bugs
6
Commits
51
Features
21
Lines of code
256,371
Activity Months6
Your Network
539 people
Work History
August 2025
1 Commits
Aug 1, 2025August 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m focusing on business value and technical achievements.
1 Commits
Aug 1, 2025August 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m focusing on business value and technical achievements.
August 2025
March 2025
11 Commits • 3 Features
Mar 1, 2025March 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m: Focused on hardening RSE provisioning, strengthening data integrity checks, and improving debugging visibility. Delivered a robust provisioning flow with configurability to disable automatic resets, enhanced safety against overflows in blob handling, and message-size validation to prevent tampering. Implemented double-read verification for LCM get, TP mode, and SP mode reads to detect data corruption during provisioning. Addressed build reliability with cleanup and corrected configuration, and added synchronization barriers to improve debug visibility after DCU updates in the LCM driver.
March 2025
11 Commits • 3 Features
Mar 1, 2025March 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m: Focused on hardening RSE provisioning, strengthening data integrity checks, and improving debugging visibility. Delivered a robust provisioning flow with configurability to disable automatic resets, enhanced safety against overflows in blob handling, and message-size validation to prevent tampering. Implemented double-read verification for LCM get, TP mode, and SP mode reads to detect data corruption during provisioning. Addressed build reliability with cleanup and corrected configuration, and added synchronization barriers to improve debug visibility after DCU updates in the LCM driver.
February 2025
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m focused on security-feature delivery in the provisioning workflow. Implemented Tamper Detection and Permanent Disablement for the Remote Secure Element (RSE) to protect device integrity when OTP tampering is detected during provisioning. The feature permanently disables the RSE to prevent compromised provisioning and includes automatic device-status updates on tampering (commit: e138468d90bec1be9c2bdf5a833a692e29da33f0). No major bug fixes were recorded this month; the primary effort was delivering a high-impact security control. Key achievements: - Delivered Tamper Detection and Permanent Disablement for RSE during provisioning (commit: e138468d90bec1be9c2bdf5a833a692e29da33f0). - Implemented automatic device-status updates when OTP tampering is detected to enable quick response and traceability. Overall impact and business value: - Strengthens provisioning security, reducing the risk of compromised devices entering production and improving trust in the supply chain. - Enables auditable, tamper-aware provisioning workflows, supporting compliance and customer assurance. Technologies/skills demonstrated: - Embedded security design for RSE provisioning - Tamper-detection logic and irreversible disablement mechanisms - Device state management and secure firmware development - Clear git-based traceability through commit messages.
1 Commits • 1 Features
Feb 1, 2025February 2025 monthly summary for zephyrproject-rtos/trusted-firmware-m focused on security-feature delivery in the provisioning workflow. Implemented Tamper Detection and Permanent Disablement for the Remote Secure Element (RSE) to protect device integrity when OTP tampering is detected during provisioning. The feature permanently disables the RSE to prevent compromised provisioning and includes automatic device-status updates on tampering (commit: e138468d90bec1be9c2bdf5a833a692e29da33f0). No major bug fixes were recorded this month; the primary effort was delivering a high-impact security control. Key achievements: - Delivered Tamper Detection and Permanent Disablement for RSE during provisioning (commit: e138468d90bec1be9c2bdf5a833a692e29da33f0). - Implemented automatic device-status updates when OTP tampering is detected to enable quick response and traceability. Overall impact and business value: - Strengthens provisioning security, reducing the risk of compromised devices entering production and improving trust in the supply chain. - Enables auditable, tamper-aware provisioning workflows, supporting compliance and customer assurance. Technologies/skills demonstrated: - Embedded security design for RSE provisioning - Tamper-detection logic and irreversible disablement mechanisms - Device state management and secure firmware development - Clear git-based traceability through commit messages.
February 2025
January 2025
3 Commits • 2 Features
Jan 1, 2025January 2025 focused on strengthening cryptographic robustness, enabling platform bring-up for new hardware, and expanding secure interfaces for remote execution. Delivered critical security hardening, platform groundwork, and RSE interface enhancements that lay the foundation for secure TF-M deployments and future hardware parity.
January 2025
3 Commits • 2 Features
Jan 1, 2025January 2025 focused on strengthening cryptographic robustness, enabling platform bring-up for new hardware, and expanding secure interfaces for remote execution. Delivered critical security hardening, platform groundwork, and RSE interface enhancements that lay the foundation for secure TF-M deployments and future hardware parity.
December 2024
23 Commits • 10 Features
Dec 1, 2024December 2024 monthly summary for zephyrproject-rtos/trusted-firmware-m: Delivered security-focused core updates, runtime enhancements, and tooling to improve configurability, reliability, and automation. Key features delivered include BL1 core updates and API enhancements (config, crypto API, measurement algorithm, image layout); RSE core config/runtime support with provisioning changes, platform error codes, config refactor, and OTP device status handling; CM policy flags and KRTL handling; unification of zero counting and ROTPK revocation; CC3XX strict alignment option and unique error codes; and Python tooling support for RSE and Tools including signing-request generation. Major bugs fixed include cleanup of OTP/CPAK code, a validation guard for invalid writes, and removal of the BL2 hash in BL1. Overall, these changes enhance security posture, platform reliability, and developer productivity through better configurability, clearer error codes, and automation capabilities.
23 Commits • 10 Features
Dec 1, 2024December 2024 monthly summary for zephyrproject-rtos/trusted-firmware-m: Delivered security-focused core updates, runtime enhancements, and tooling to improve configurability, reliability, and automation. Key features delivered include BL1 core updates and API enhancements (config, crypto API, measurement algorithm, image layout); RSE core config/runtime support with provisioning changes, platform error codes, config refactor, and OTP device status handling; CM policy flags and KRTL handling; unification of zero counting and ROTPK revocation; CC3XX strict alignment option and unique error codes; and Python tooling support for RSE and Tools including signing-request generation. Major bugs fixed include cleanup of OTP/CPAK code, a validation guard for invalid writes, and removal of the BL2 hash in BL1. Overall, these changes enhance security posture, platform reliability, and developer productivity through better configurability, clearer error codes, and automation capabilities.
December 2024
November 2024
12 Commits • 5 Features
Nov 1, 2024November 2024 — TrustedFirmware-M (zephyrproject-rtos/trusted-firmware-m) delivered security-focused boot and cryptography enhancements that strengthen provisioning, boot-time resilience, and memory efficiency, enabling safer industrial deployments and faster secure boot. Business value is realized through streamlined provisioning, robust boot failure handling, post-quantum readiness, and increased cryptographic capability on constrained platforms.
November 2024
12 Commits • 5 Features
Nov 1, 2024November 2024 — TrustedFirmware-M (zephyrproject-rtos/trusted-firmware-m) delivered security-focused boot and cryptography enhancements that strengthen provisioning, boot-time resilience, and memory efficiency, enabling safer industrial deployments and faster secure boot. Business value is realized through streamlined provisioning, robust boot failure handling, post-quantum readiness, and increased cryptographic capability on constrained platforms.
Activity
Loading activity data...
Quality Metrics
Correctness88.4%
Maintainability86.6%
Architecture86.4%
Performance78.8%
AI Usage20.0%
Skills & Technologies
Programming Languages
CC++CMakePythonRSTShellccmaketext
Technical Skills
API DesignARM ArchitectureBootloader DevelopmentBuild System ConfigurationBuild SystemsC ProgrammingCMakeCode RemovalConfiguration ManagementCryptographyData ProcessingDriver DevelopmentEmbedded SystemsEmbedded Systems DevelopmentError Handling
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline