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Marcella Hastings

PROFILE

Marcella Hastings

Marcella developed and maintained core cryptographic features for the GaloisInc/cryptol-specs repository over 14 months, delivering robust implementations of AES, AES-XTS, and key wrap modes, as well as post-quantum algorithms like ML-KEM and MLDSA. She focused on API design, formal verification, and comprehensive test coverage, using Cryptol, Bash, and YAML to ensure correctness and maintainability. Her work included optimizing CI/CD pipelines, expanding automated testing for cryptographic primitives, and refining documentation for standards compliance. By addressing both feature development and infrastructure reliability, Marcella enabled faster, safer releases and improved the security posture of cryptographic workflows in the codebase.

Overall Statistics

Feature vs Bugs

82%Features

Repository Contributions

255Total
Bugs
15
Commits
255
Features
70
Lines of code
1,618,214
Activity Months14

Work History

December 2025

4 Commits • 1 Features

Dec 1, 2025

Month: 2025-12. Focused on CI/CD reliability and performance improvements for the GaloisInc/cryptol-specs repository. Implemented CI pipeline optimizations by removing the heavy ml-dsa-87 parameter set, ensured cache saving even when docstring checks time out, improved docstring check failure reporting, and simplified cache-saving checks to speed up and stabilize CI runs. Result: faster feedback, fewer flaky builds, and more reliable release readiness for cryptol-specs.

October 2025

4 Commits • 1 Features

Oct 1, 2025

October 2025 monthly summary for GaloisInc/cryptol-specs: Expanded CI coverage for cryptographic primitives, delivering critical enhancements to test validation and overall security posture. Main features delivered include expanded CI testing for AES key wrap and XTS mode, integration of ML-KEM into CI, and addition of ML-DSA instantiations and dedicated ML-DSA-87 tests into the automated pipeline. These changes improve early detection of cryptographic regressions and accelerate safe deployment of ML-based cryptography components.

September 2025

6 Commits • 1 Features

Sep 1, 2025

Month: 2025-09. This month focused on expanding cryptographic testing in the GaloisInc/cryptol-specs CI, improving configuration, and stabilizing CI flow. Key activities included adding broader crypto test coverage, reorganizing configuration, and risk-aware adjustments to CI when encountering a known bug. This work reduces risk, speeds feedback, and sets the foundation for faster cryptography changes in production.

August 2025

21 Commits • 4 Features

Aug 1, 2025

2025-08 Monthly Summary — GaloisInc/cryptol-specs: Strengthened foundation with extensive codebase hygiene, CI reliability, and a comprehensive Keywrap feature set. Focused on API design, test coverage, and documentation to enable safer, faster releases while reducing maintenance risk and improving security posture.

July 2025

13 Commits • 4 Features

Jul 1, 2025

July 2025 monthly summary focused on correctness, test reliability, and maintainability across GaloisInc/cryptol-specs and GaloisInc/saw-script. Delivered targeted features and fixes that reduce cryptographic risk, improve CI/test coverage, and streamline maintenance, with clear business value and technical impact.

June 2025

4 Commits • 2 Features

Jun 1, 2025

In June 2025, the Cryptol-specs project focused on delivering a stronger feature set alongside improved CI/CD reliability, with a clear emphasis on business value, maintainability, and faster release readiness. The team delivered AES-XTS mode support and corresponding documentation improvements, and implemented CI/CD optimizations to reduce pipeline friction and improve feedback loops for developers and stakeholders. Key deliverables in Cryptol-specs (GaloisInc/cryptol-specs): - AES-XTS mode support and documentation improvements: Instantiation for AES-XTS mode, updated READMEs to correct inaccuracies, enhanced the SHA1 support table, and removed an outdated AES migration guide to streamline documentation. Related work aimed at ensuring secure storage capabilities and accurate developer guidance. (Commit: d93224950c30fb55492d78f9b011a44988deac9a) - CI/CD pipeline improvements: Expanded docstring validation triggers to cover PRs and master pushes with weekly scheduling; centralized docstring cache on the master branch; and simplified CI by removing the unnecessary git installation step, speeding up builds and reducing failure surfaces. Related work includes several commits advancing logic and reliability. (Commits: bf45e03af15092b44d2837b516ce5894da10f011; 40442062f351f58a32d44a6c37940307e2e69df0; 889e54e33ff75bf9e17bb8a09ab564500a1b734a)

May 2025

1 Commits • 1 Features

May 1, 2025

May 2025 monthly summary for GaloisInc/cryptol-specs: Delivered AES-256 XTS test vectors per IEEE P1619 Annex B, expanding validation coverage for XTS mode. Implemented test vectors covering encryption and decryption with defined keys, sequence numbers, plaintext, and ciphertext. The work is captured in commit 9218f153f3817e533250496fcb421afe0d367862 ('aes-xts: add test vectors for AES256-XTS'). Impact: strengthens the repository as a reliable reference for AES-XTS behavior, enabling earlier regression detection and improved interoperability with external implementations. Technologies/skills demonstrated: cryptographic testing, AES-XTS, IEEE P1619 compliance, test vector design, repository hygiene.

April 2025

19 Commits • 2 Features

Apr 1, 2025

April 2025: Delivered substantial maintainability and capability gains in cryptol-specs. Key features: AES and GCM module cleanup and test-suite modernization (including removal of deprecated AES-256-GCM, module/test reorganization, and updated documentation); Simon and Speck cipher support; ECC property correctness fixes; CI reliability improvements by resolving GitHub CLI installation in the CI pipeline to ensure docstring validations run consistently.

March 2025

5 Commits • 1 Features

Mar 1, 2025

March 2025 monthly summary focusing on cryptographic development, test reliability, and documentation improvements for GaloisInc/cryptol-specs. The month delivered targeted test suite correctness fixes and expanded cryptographic capabilities with UnconstrainedSpec-backed ECDSA P-521 support for SHA-512 and SHA3-512, complemented by documentation updates and broader test coverage. These efforts strengthen correctness, security assurances, and maintainability for deployment in crypto-sensitive apps.

February 2025

13 Commits • 3 Features

Feb 1, 2025

February 2025 monthly summary for GaloisInc/cryptol-specs: Focused delivery across cryptographic core improvements, Suite B integration, and test infrastructure to drive performance, compliance, and maintainability. Business value accrued through faster cryptographic operations, a scalable Suite B build configuration, and clearer test organization that reduces ramp time for future changes and risk in releases.

January 2025

44 Commits • 11 Features

Jan 1, 2025

Month: 2025-01 — Concise monthly summary focusing on business value and technical achievements across GaloisInc/cryptol-specs. This period delivered core cryptographic feature work, standardization efforts, expanded test coverage, and documentation/maintenance improvements that enhance interoperability, onboarding, and long-term stability.

December 2024

52 Commits • 14 Features

Dec 1, 2024

December 2024: Delivered foundational MLDSA and cryptographic utilities in GaloisInc/cryptol-specs, focusing on reliability, performance readiness, and verifiability of secure workflows. Key outcomes include a suite of low-level data handling utilities, enhanced sampling and internal correctness tooling, and substantial MLDSA core work that lays groundwork for future optimizations and wider adoption. Highlights: bit packing/unpacking utilities with property support; integer/bit/byte conversion utilities; improved hint unpack behavior; expanded rejection sampling (ball, matrix, vector) with a RejNTTPoly bug fix; encoding/decoding utilities for keys, signatures, and polynomial vectors; MLDSA NTT groundwork (naive NTT, addition/multiplication, bitreversed ordering, vectorized overloads) plus core MLDSA progress (keygen, sign, verify) and interface/module restructuring; expanded arithmetic and utilities (expand mask, modular arithmetic, decomposition, bit-slicing, hint utilities); correctness property addition; external API KATs and licensing/docs updates; bug fixes (Sloppy naming, UseHint).

November 2024

66 Commits • 23 Features

Nov 1, 2024

Concise monthly summary for 2024-11 focusing on key accomplishments, major bugs fixed, business value and technical achievements. Delivered external API surface changes for ML-KEM, expanded XMSS WOTS implementation, improved internal API hygiene and validation, fixed critical bugs, and stabilized documentation/parameters to improve production readiness.

October 2024

3 Commits • 2 Features

Oct 1, 2024

Month: 2024-10 — Monthly summary for GaloisInc/cryptol-specs focusing on delivering cryptographic key management components and improving encoding workflows. Highlights include WOTS+ key definitions with a generation function and ML-KEM encoding/decoding improvements with documentation updates and internal refactoring. No explicit bug fixes were reported this month; emphasis on security, clarity, and maintainability to support future XMSS-related work and standards alignment.

Activity

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Quality Metrics

Correctness97.4%
Maintainability97.2%
Architecture96.2%
Performance90.6%
AI Usage20.0%

Skills & Technologies

Programming Languages

BashCCryCryptolCrytpolLaTeXMarkdownSAWScriptShellTOML

Technical Skills

AESAES Key WrapAES-XTSAPI DesignAPI DevelopmentAlgorithm ImplementationAlgorithm OptimizationAlgorithm RefactoringAlgorithm RemovalAlgorithm VerificationAsymmetric EncryptionAsymmetric Key CryptographyBackend DevelopmentBug FixingBuild Configuration

Repositories Contributed To

2 repos

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

GaloisInc/cryptol-specs

Oct 2024 Dec 2025
14 Months active

Languages Used

CryptolCryLaTeXMarkdownawkCrytpolShellTOML

Technical Skills

CryptographyCryptolDocumentationFormal VerificationSoftware EngineeringAPI Design

GaloisInc/saw-script

Jul 2025 Jul 2025
1 Month active

Languages Used

CryptolSAWScriptShell

Technical Skills

Bug FixingCI/CDCode CleanupCode MaintenanceCryptographic VerificationDependency Management

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