Monthly summary for 2026-04 (nxp-upstream/zephyr) focusing on business value and technical achievements. Key features delivered: - MCUboot security and cryptographic enhancements: Fix manifest handling for encrypted images, remove legacy ver field from RSA context, add support for AES and CTR encryption, and expose legacy MCUboot include files to provide AES and RSA helper functions for mbedTLS cryptographic support. Commits: d0dd88c3303592fbed3586ee47bf2b15e6a87e2d; 26d4afe225d0c3cac9e1a2a639376910bd2710bd. - Mbed TLS and related repositories upgraded to official release tags: Bumped to Mbed TLS 4.1.0 and TF-PSA-Crypto 1.1.0, with mldsa-native pointing to 5772b4f4a0105694b1203abb582273f78fa951b7. Commit: c03f17d513b2b7763a287fe6b7f24c368b1d5119. - TF-PSA-Crypto: Clang compatibility and warning fixes to improve build stability across toolchains. Commit: b9b37edd2cc561cad6f782465a2a5bf5da44df4b. Major bugs fixed: - Clang-based compiler warning cleanup and stability improvements via upstream PR integration (TF-PSA-Crypto). Commit: b9b37edd2cc561cad6f782465a2a5bf5da44df4b. Overall impact and accomplishments: - Strengthened security posture by enabling encrypted image support and aligning cryptography stacks with official release baselines, reducing maintenance burden and risk. - Improved build reliability and cross-toolchain compatibility through Clang warning fixes and standardized releases, accelerating development readiness and deployment. - Clear traceability to commits and repositories enhances auditability and compliance for release management. Technologies/skills demonstrated: - MCUboot, mbedTLS (including AES/RSA helper exposure), PSA Crypto integration, and Clang-based toolchain tuning. - Release management and cross-repo coordination for security-sensitive components.

March 2026 monthly summary across nxp-upstream/zephyr, renesas/zephyr, zephyrproject-rtos/openthread, and zephyrproject-rtos/mcuboot. Focused on TF-PSA-Crypto and Mbed TLS integration with MLDSA enablement, TF-M integration refinements, entropy improvements, test stability, and governance/documentation. Deliverables span multi-repo cryptography alignment, platform compatibility, and build reliability that enable compliant, secure features for upcoming releases.

February 2026 monthly summary for renesas/zephyr: Delivered two major features to advance TF-M/PSA-Crypto compatibility and PSA API alignment in the Zephyr crypto stack, delivering tangible business value through improved security integration, reduced build fragility, and cleaner codebase.

January 2026 monthly summary: Delivered major progress across two repositories (Mbed-TLS/mbedtls-framework and renesas/zephyr), focusing on PSA Crypto migration, TLS configurability, and test/stability improvements. Achievements include migrating crypto backend to PSA by default in Zephyr, removing legacy Mbed TLS crypto, enhancing PK helpers with predefined keys and standardized error handling, and improving documentation and tooling. Bug fixes improved compatibility with TF_PSA_CRYPTO versioning. These changes strengthen security, reduce maintenance burden, and improve testing reliability, delivering business value through secure defaults, clearer debugging, and faster iteration.

December 2025 performance snapshot: Delivered security, compatibility, and stability improvements across Mbed-TLS/mbedtls-framework and renesas/zephyr, driving stronger trust, lower maintenance burden, and more flexible cryptographic configurations. Highlights include a certificate security upgrade with SHA-256 and extended validity for server5/server11; removal of deprecated secp192 support to align with TF-PSA-crypto; integration of public key helper utilities to ease key management and testing; CCM tag length configurability in the crypto driver for flexible crypto setups; and a critical AES-ECB fix on RISCV 64-bit to prevent crashes.

November 2025 performance highlights focused on security modernization, PSA-based cryptography, and data hygiene across three repositories. Delivered concrete crypto management capabilities, aligned stack to modern standards, and enabled OpenThread readiness with PSA and TLS enhancements. Implemented removal of legacy crypto dependencies where applicable, and improved test/data coverage to support future audits and releases.

Month: 2025-10. This month delivered substantial momentum in our cryptography and platform reliability initiatives across three repositories, with a clear focus on business value: stronger security posture through PSA Crypto adoption, improved test coverage and validation, and improved audio and system reliability for embedded platforms.

September 2025 monthly summary for developer performance review. Across four key repositories (espressif/TF-PSA-Crypto, linux-riscv/linux, zephyrproject-rtos/zephyr, and nrfconnect/sdk-zephyr), the team delivered critical PSA Crypto capabilities, stabilized testing, and streamlined configuration, translating to tangible business and security value. Key achievements (top 5): 1) PSA_KEY_USAGE_DERIVE_PUBLIC support added in PSA and internal handling (TF-PSA-Crypto), enabling derived-key workflows and stronger key-use semantics. (commits: 2ff00c712c8d2d9284cc94caea9558a5999b183f; 19744c1263a4615c9b04198c71d0bc94b0653479) 2) MBEDTLS_PK_CAN_DO_PSA capability implemented with PSA_ALG handling, guards, documentation, and extensive tests, delivering robust compatibility checks and wider API coverage. (representative commits: fca9cd2b0d2676c44afd3bf8cd1acedd63f3e3c0; 0faad286d761ac97042a72405a9970f94d1ad47c; c2c131439848cc54733691b7e4b997b3966dba1d; b8e9641bbf16a0321f0d2c02be3649eae2f5bc90; 7703a25d207bd79c2a40ceb6c49394bcb18d3f82; 48681bf457505e6b96fb971e7366842b22c5d1d2; 80ab560f8e9c397ff2864006ad4419956635891d; fbd58bad4630abc627d1d45083a764e962edfd78; 877c32d7de695d727aa8dedfb4887886368105d1; 7603f193f03e28994ffd03aa6f7ea19a69355b0e; 2b7c7c1be6731bd5a9d6856be7b069ba678b0ea2; 1991f7563fb57a965db62bdb90a4cf5befbb25f4; eead2229c8dd7d723310dced720658db80ce232c) 3) Test suite PSA Crypto slot management: tests and data fixes to improve reliability and regression handling, including persistent_key_destroy adjustments and slot lifecycle data stabilization. (commits: 61211c5e449a9ad537bc1ab7bb52074c81c0e7c1; 6a46d152a66f173b40596ec349b9302d60e92b4f; d1126b03e283268841647e77d6a68994b02ccef2; 3b76b8fde3f0dfdfbbd2eed3e1f47c531e07f272; 55ff0a921a1b67acb58abb140063c995de0b02c4; 656cf5c19fd882d1514d8a65ddddfb3366d87f1a) 4) PSA_CRYPTO provider abstraction and config cleanup: introduced provider-agnostic PSA Crypto usage across Zephyr and NRF SDK, plus related OpenThread/ESP32 adjustments and build-dependency simplifications. (Zephyr commits: 1bc2db575f7eb88426f5c239877cbce9f6950ba7; 46614ded36f099e0b5327c7df9967fdb75ada38b; 76037cec36554184a4ca82ffef4d4ba3bc61666e; NRF/from-tree: befc17735a873999c8bbf107d3d655c84de9d37c; 0964fc55846ed51ed117b7b1feb568c45a51601b; bd899ed455edef9eb93c078c38bdb8bed1ec5b7a; d16809413297a4cca0c7e0ba2ea8cbebafbde4cd) 5) PKCS v1.5 handling improvements and header/compatibility fixes: ensuring PKCS v1.5 is used where applicable and aligning header guards, improving cross-module interoperability. (commits: 6bd3a1331246f1b99afa6b8fb35a9a1b426cd12d; 46f82b2353a0297c986bf75ebbaa0df9ebbb5b4d; db317fc279aa5feefbafc2ddd9d6d4883c2cf593; d7fee19e83f1eb12db2a8170cd1ee58defd63ec2; 2a0dd441ecc8fd748a752f96b778a736e7b61221; 7b7b4fcde20c247279bcb51b64565ce4b37c2146) Overall impact and accomplishments: - Improved security posture with clearer key-usage semantics and broader PSA Crypto support across TF-M and Open Source stacks. - Enhanced reliability through targeted test-data fixes, regression-proofing of slot management, and removal of fragile entropy dependencies in Bluetooth driver configurations. - Streamlined configuration and maintenance by introducing PSA_CRYPTO symbol and migration/deprecation guidance, reducing build-time variability across platforms. - Stronger interoperability and maintainability via header compatibility cleanup, PKCS v1.5 handling improvements, and comprehensive changelog/documentation updates. Technologies/skills demonstrated: - C, embedded cryptography, MBed TLS, PSA Crypto APIs, and PK abstraction layers - Build/configuration improvements (Kconfig, header guards, compatibility shims) - Test automation and regression testing for cryptographic primitives - Cross-repo integration and platform-wide consistency (TF-M, Zephyr, NRF SDK, Linux)

In August 2025, delivered cross-repo improvements focused on security posture, test reliability, and hardware support. Highlights include gating P-224 EC test generation by mbedtls version, enabling flexible test handling for PSA compliance, deprecating legacy EC curves for stronger security, and enabling power-button hardware support on Zephyr-supported boards. These changes reduce risk, improve cross-version compatibility, and accelerate hardware bring-up and verification across teams.

July 2025 monthly summary for espressif/TF-PSA-Crypto focusing on PSA alignment and API enhancements. Delivered PSA-aligned ECDSA macro standardization and added a PSA-focused compatibility API, underpinned by code refactors, documentation, and tests. Result: clearer PSA integration paths, improved key-usage validation, and expanded test coverage. No separate critical bug fixes reported this month; the work improves long-term reliability and interoperability with PSA ecosystems.

June 2025 performance summary: Strengthened the crypto stack, expanded PSA integration, and improved build/test reliability across four repositories. Delivered legacy Mbed TLS crypto support on TF-M platforms, integrated PSA RSA support into the PK driver, and updated RSA data storage compatibility tests. Completed Everest driver maintenance refactors for better encapsulation, and improved Mbed TLS config auto-selection for image signing to reduce build warnings. These changes reduce crypto-path risk, improve PSA interoperability, and accelerate secure deployment pipelines across Nordic/Espressif/Arm ecosystems.

May 2025 performance summary across AmbiqMicro/ambiqzephyr, espressif/TF-PSA-Crypto, and Mbed-TLS/mbedtls-framework. Focused on delivering business-critical PSA Crypto features, removing legacy dependencies, improving reliability, and strengthening test tooling. Result: leaner configurations, fewer runtime/build errors, faster CI feedback, and enhanced security posture.

April 2025 monthly summary focused on delivering critical security features, stabilizing cross-platform entropy handling, and improving testing and framework robustness. Key outcomes include TF-PSA Crypto Zeroize support with end-to-end test coverage, PK verification behavior fixes, entropy API consolidation across platforms (including Windows), and readiness improvements for CI/demos through framework reference alignment and enhanced demo harnesses. These efforts collectively strengthen security posture, reliability, and maintainability while driving faster, safer iteration for embedded crypto workloads.

March 2025 performance summary for espressif/TF-PSA-Crypto and Mbed-TLS/mbedtls-framework. This month focused on stabilizing PSA cryptography flows, removing deprecated components, enhancing entropy handling, and improving CI/build reliability to accelerate secure development across the TF-PSA-Crypto and mbed TLS ecosystems.

February 2025 performance summary focusing on PSA Crypto integration, cross-repo test automation, TLS security enhancements, and build/test system improvements across Mbed TLS, TF-PSA-Crypto, Zephyr MCUBoot, and related projects. Delivered key features, fixed significant regressions, reduced maintenance debt, and strengthened cross-repo consistency with hands-on scripting, CMake/configuration, and security-focused improvements.

January 2025 performance highlights: Delivered targeted crypto configuration improvements, improved build/test reliability, and environment standardization across Mbed TLS, TF-PSA-Crypto, and Zephyr. These changes strengthen security posture, streamline CI and integration, and accelerate future development by clarifying options and aligning frameworks.

December 2024 monthly summary focusing on key accomplishments across telink-semi/zephyr and Mbed-TLS/mbedtls-framework. This period delivered policy-driven entropy management improvements, foundational tooling enhancements, and reliability fixes that reduce configuration drift, improve security posture, and accelerate development workflows across multiple repositories.

November 2024 monthly summary focusing on delivering practical crypto/Zephyr improvements across two repositories, stabilizing test and runtime behavior, and aligning with TF-M crypto capabilities.

October 2024: Implemented memory-optimized PSA Crypto integration via static key slots across Zephyr-related repos. Delivered statically allocated key buffers in Mbed TLS with a Kconfig option and patch-based integration, enabling reduced heap usage on memory-constrained devices. This work enhances security posture and prepares ground for future Mbed TLS releases. Documentation and traceability via west.yml patches and explicit commits.

July 2024 monthly summary for zephyrproject-rtos/mbedtls: Implemented PSA Crypto support integration in MCUboot by aligning legacy module adjustments with MCUboot and Mbed TLS cryptographic features to enable PSA-based crypto in the secure-boot path. This work established a repeatable integration pattern by adjusting build configuration and symbol usage, ensuring compatibility and reducing risk for future crypto feature deployments.