
Rod Chapman developed and maintained core cryptographic libraries in the pq-code-package/mlkem-c-aarch64 and mldsa-native repositories, focusing on formal verification, performance optimization, and build automation. He implemented CBMC-based proofs and SMT solver integration to strengthen correctness and security, refactored C and ARM assembly code for safer APIs and improved maintainability, and modernized build systems using Makefile and Nix. His work included automating cross-platform builds, enforcing code style consistency, and enhancing debugging workflows. By addressing verification stability and macro hygiene, Rod delivered robust, reproducible cryptographic components, demonstrating deep expertise in C programming, formal verification, and low-level optimization for secure software.

Month: 2025-10. Focus: macro stability improvements across two codebases by migrating macro-generated variable names from __LINE__ to __COUNTER__, plus minor documentation correction. Key features delivered: mlkem-c-aarch64: replaced __LINE__-based macro variable generation with __COUNTER__ for generated names, improving proof stability against minor code changes; commit 17bdc7df125da56a5f6e5f24c229a5c7b6f7e732. mldsa-native: refactored macro definitions to use COUNTER for quantified variable naming, preventing changes from altering names and improving proof reliability; commit 46ecf314a111f081c84ea3ad171fecaa26063ca2. Major bugs fixed: reduced fragility of proofs due to __LINE__-based naming; improved documentation alignment in proof_guide.md. Overall impact and accomplishments: higher proof stability, reduced maintenance churn, and cross-repo consistency; demonstrated macro-level correctness improvements with clear business value. Technologies/skills demonstrated: C macro programming (COUNTER), preprocessor-driven refactoring, cross-repo code hygiene, and documentation governance.
Month: 2025-10. Focus: macro stability improvements across two codebases by migrating macro-generated variable names from __LINE__ to __COUNTER__, plus minor documentation correction. Key features delivered: mlkem-c-aarch64: replaced __LINE__-based macro variable generation with __COUNTER__ for generated names, improving proof stability against minor code changes; commit 17bdc7df125da56a5f6e5f24c229a5c7b6f7e732. mldsa-native: refactored macro definitions to use COUNTER for quantified variable naming, preventing changes from altering names and improving proof reliability; commit 46ecf314a111f081c84ea3ad171fecaa26063ca2. Major bugs fixed: reduced fragility of proofs due to __LINE__-based naming; improved documentation alignment in proof_guide.md. Overall impact and accomplishments: higher proof stability, reduced maintenance churn, and cross-repo consistency; demonstrated macro-level correctness improvements with clear business value. Technologies/skills demonstrated: C macro programming (COUNTER), preprocessor-driven refactoring, cross-repo code hygiene, and documentation governance.
Performance-driven monthly summary for 2025-09: Strengthened formal verification and debugging capabilities across two repos (mlkem-c-aarch64 and mldsa-native). Implemented explicit buffer bounds and guaranteed malloc failure behavior in mlkem-native CBMC proofs; added SMT file generation targets and provenance reporting for multiple provers; enhanced CBMC debugging workflows in mldsa-native with SMT-only generation and a slice-formula option; removed the --no-array-field-sensitivity flag to stabilize proof times. Result: improved safety guarantees, traceability, and cross-prover comparability, enabling faster issue detection and lower verification risk.
Performance-driven monthly summary for 2025-09: Strengthened formal verification and debugging capabilities across two repos (mlkem-c-aarch64 and mldsa-native). Implemented explicit buffer bounds and guaranteed malloc failure behavior in mlkem-native CBMC proofs; added SMT file generation targets and provenance reporting for multiple provers; enhanced CBMC debugging workflows in mldsa-native with SMT-only generation and a slice-formula option; removed the --no-array-field-sensitivity flag to stabilize proof times. Result: improved safety guarantees, traceability, and cross-prover comparability, enabling faster issue detection and lower verification risk.
July 2025 highlights API modernization and formal verification across two repositories, delivering safer cryptographic primitives, clearer interfaces, and more deterministic verification. Key outcomes include API refactors, enhanced proofs, and configurable verification tooling that reduce risk and accelerate validation cycles.
July 2025 highlights API modernization and formal verification across two repositories, delivering safer cryptographic primitives, clearer interfaces, and more deterministic verification. Key outcomes include API refactors, enhanced proofs, and configurable verification tooling that reduce risk and accelerate validation cycles.
June 2025 focused on cleaning up verification-related debt and harmonizing builds for next-gen architectures across two PQ code packages. Key outcomes include removing CBMC workarounds post-upgrade, enhancing verifier safety through API-level refactors, and enabling Neoverse-N1 optimization with updated toolchains and build configurations.
June 2025 focused on cleaning up verification-related debt and harmonizing builds for next-gen architectures across two PQ code packages. Key outcomes include removing CBMC workarounds post-upgrade, enhancing verifier safety through API-level refactors, and enabling Neoverse-N1 optimization with updated toolchains and build configurations.
May 2025 monthly performance focusing on formal verification improvements for cryptographic libraries and tooling modernization across two repositories. Deliverables emphasize faster, more reliable proofs, better reporting, and licensing clarity, with proven proficiency in formal methods and build tooling.
May 2025 monthly performance focusing on formal verification improvements for cryptographic libraries and tooling modernization across two repositories. Deliverables emphasize faster, more reliable proofs, better reporting, and licensing clarity, with proven proficiency in formal methods and build tooling.
April 2025 monthly summary focusing on key business- and technically-focused accomplishments across two repositories. Delivered code quality and compliance enhancements with a foundation for future reliability improvements.
April 2025 monthly summary focusing on key business- and technically-focused accomplishments across two repositories. Delivered code quality and compliance enhancements with a foundation for future reliability improvements.
March 2025 monthly summary focusing on delivering performance enhancements, robustness, and maintainability across two repositories: mlkem-c-aarch64 and mldsa-native. Key work included AArch64 backend optimizations and macro standardization, formal verification proofs for make_hint, and improvements to the build and test workflow. No distinct major bug fixes were reported; the month emphasized performance, correctness, and reproducibility.
March 2025 monthly summary focusing on delivering performance enhancements, robustness, and maintainability across two repositories: mlkem-c-aarch64 and mldsa-native. Key work included AArch64 backend optimizations and macro standardization, formal verification proofs for make_hint, and improvements to the build and test workflow. No distinct major bug fixes were reported; the month emphasized performance, correctness, and reproducibility.
February 2025 monthly summary for repository pq-code-package/mlkem-c-aarch64. Delivered performance optimizations and process improvements for AArch64 back-end components, focusing on INTT/NTT performance, naming consistency, and build automation to enable reproducible optimizations with SLOTHLY.
February 2025 monthly summary for repository pq-code-package/mlkem-c-aarch64. Delivered performance optimizations and process improvements for AArch64 back-end components, focusing on INTT/NTT performance, naming consistency, and build automation to enable reproducible optimizations with SLOTHLY.
January 2025: Delivered targeted improvements to the mlkem-c-aarch64 pipeline, focusing on visibility of proof results and macOS execution reliability. The changes improved debugging efficiency, reduced environment-related failures, and contributed to a more stable development and CI experience for the repository.
January 2025: Delivered targeted improvements to the mlkem-c-aarch64 pipeline, focusing on visibility of proof results and macOS execution reliability. The changes improved debugging efficiency, reduced environment-related failures, and contributed to a more stable development and CI experience for the repository.
December 2024 monthly summary for the mlkem-c-aarch64 repository focused on cross-platform build reliability for the benchmark suite. Delivered macOS GCC 14 build compatibility by adjusting compiler behavior to avoid -Wpedantic errors in void* to function pointer conversions used by dlsym, enabling the benchmark tests to compile and run. This fix removes a critical CI/build blocker and tightens cross-platform test coverage.
December 2024 monthly summary for the mlkem-c-aarch64 repository focused on cross-platform build reliability for the benchmark suite. Delivered macOS GCC 14 build compatibility by adjusting compiler behavior to avoid -Wpedantic errors in void* to function pointer conversions used by dlsym, enabling the benchmark tests to compile and run. This fix removes a critical CI/build blocker and tightens cross-platform test coverage.
November 2024: Expanded formal verification coverage and proof workflow efficiency for pq-code-package/mlkem-c-aarch64. Delivered CBMC-based proofs and contracts for message conversion and cryptographic primitives, extended verification to core primitives (indcpa_dec, unpack_ciphertext, FIPS-202 hashes), improved proof generation speed, and completed contract simplifications for maintainability. These efforts strengthen correctness, security guarantees, and development velocity for MLKEM components, enhancing reliability for deployment and certification readiness.
November 2024: Expanded formal verification coverage and proof workflow efficiency for pq-code-package/mlkem-c-aarch64. Delivered CBMC-based proofs and contracts for message conversion and cryptographic primitives, extended verification to core primitives (indcpa_dec, unpack_ciphertext, FIPS-202 hashes), improved proof generation speed, and completed contract simplifications for maintainability. These efforts strengthen correctness, security guarantees, and development velocity for MLKEM components, enhancing reliability for deployment and certification readiness.
Overview of all repositories you've contributed to across your timeline