risc0/zirgen
Nov 2024 – Apr 2025
4 Months active
Languages Used
C++MLIRBazelMarkdownRust
Technical Skills
Circuit designCompiler developmentCryptographyEmbedded systemsLow-level programmingArithmetic optimization
Tim Zerrell
PROFILE
Tim Zerrell
Worked on the risc0/zirgen repository, delivering cryptographic backend enhancements and circuit design features over four months. Focused on expanding elliptic curve operations, parameterizing cryptographic primitives, and introducing field extension arithmetic for zk protocols. Used C++, Rust, and MLIR to implement memory-isolated EC point addition, modular exponentiation with increased bitwidth, and specialized multiplication for field extensions. Refactored the RSA backend to modular multiplication, improving maintainability and test coverage. Contributed comprehensive documentation and reorganized code for clarity, supporting easier onboarding and integration. The work emphasized low-level programming, arithmetic optimization, and robust testing, strengthening the foundation for scalable cryptographic workflows.
Overall Statistics
Feature vs Bugs
100%Features
Repository Contributions
9Total
Bugs
0
Commits
9
Features
5
Lines of code
2,645
Activity Months4
Your Network
12 peopleWork History
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 — Delivered a major RSA cryptography backend refactor in the risc0/zirgen repository, shifting from modular exponentiation (modpow) to modular multiplication. This included removing legacy rsa.cpp/rsa.h, introducing rsa_helper.cpp/h for testing, and migrating cryptographic artifacts from modpow65537_4096.blob to modmul_4096.blob. The change simplifies the RSA operation path, improves maintainability, enhances testability, and reduces surface area for future security enhancements across platforms.
1 Commits • 1 Features
Apr 1, 2025April 2025 — Delivered a major RSA cryptography backend refactor in the risc0/zirgen repository, shifting from modular exponentiation (modpow) to modular multiplication. This included removing legacy rsa.cpp/rsa.h, introducing rsa_helper.cpp/h for testing, and migrating cryptographic artifacts from modpow65537_4096.blob to modmul_4096.blob. The change simplifies the RSA operation path, improves maintainability, enhances testability, and reduces surface area for future security enhancements across platforms.
April 2025
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025 (risc0/zirgen) monthly summary: - Focused on delivering a major feature: Bigint Circuit Field Extension Operations for Degree-2 and Degree-4, expanding field arithmetic capabilities within the bigint circuit and enabling more versatile zk protocols. - Implemented optimized x^2+1 multiplication as part of the degree-2/degree-4 extension support, enhancing performance for cryptographic operations. - The work is associated with commit 969982e0d4b1a594296c6b6f80abbd7cb263bd4a (ZIR-325) and linked to issue #159, providing traceability and maintainability. - No major bugs reported this month; the feature rollout strengthens the foundation for broader zk-circuit capabilities and future protocol enhancements.
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025 (risc0/zirgen) monthly summary: - Focused on delivering a major feature: Bigint Circuit Field Extension Operations for Degree-2 and Degree-4, expanding field arithmetic capabilities within the bigint circuit and enabling more versatile zk protocols. - Implemented optimized x^2+1 multiplication as part of the degree-2/degree-4 extension support, enhancing performance for cryptographic operations. - The work is associated with commit 969982e0d4b1a594296c6b6f80abbd7cb263bd4a (ZIR-325) and linked to issue #159, providing traceability and maintainability. - No major bugs reported this month; the feature rollout strengthens the foundation for broader zk-circuit capabilities and future protocol enhancements.
December 2024
4 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for risc0/zirgen. Focused on strengthening the cryptographic backend, improving developer experience, and laying groundwork for scalable growth. Key features delivered: BigInt circuit documentation; cryptographic core enhancements with parameterized bitwidths and standardized APIs; precompiled prime field operations; RSA checker; codepath reorganizations; and cleanup of leftover arithmetic terms. Major impact: improved security checks, performance of cryptographic primitives, and maintainability; enabled easier onboarding and integration with bootstrap code and tooling. Technologies demonstrated: C++ cryptography primitives, precompiles, bitwidth parameterization, code organization, and documentation best practices. Business value: reduced risk through better validation, faster development cycles, and more scalable cryptographic pipelines for zk and related workflows.
4 Commits • 2 Features
Dec 1, 2024December 2024 monthly summary for risc0/zirgen. Focused on strengthening the cryptographic backend, improving developer experience, and laying groundwork for scalable growth. Key features delivered: BigInt circuit documentation; cryptographic core enhancements with parameterized bitwidths and standardized APIs; precompiled prime field operations; RSA checker; codepath reorganizations; and cleanup of leftover arithmetic terms. Major impact: improved security checks, performance of cryptographic primitives, and maintainability; enabled easier onboarding and integration with bootstrap code and tooling. Technologies demonstrated: C++ cryptography primitives, precompiles, bitwidth parameterization, code organization, and documentation best practices. Business value: reduced risk through better validation, faster development cycles, and more scalable cryptographic pipelines for zk and related workflows.
December 2024
November 2024
3 Commits • 1 Features
Nov 1, 2024Monthly performance summary for 2024-11. Focused on cryptographic EC operations in risc0/zirgen, delivering robustness, flexibility, and readiness for larger key sizes. Key features delivered include memory-isolated EC point addition, dynamic multi-curve EC acceleration, and an expanded modular exponentiation bitwidth, driving security, interoperability across curves, and future-proof cryptographic workloads.
November 2024
3 Commits • 1 Features
Nov 1, 2024Monthly performance summary for 2024-11. Focused on cryptographic EC operations in risc0/zirgen, delivering robustness, flexibility, and readiness for larger key sizes. Key features delivered include memory-isolated EC point addition, dynamic multi-curve EC acceleration, and an expanded modular exponentiation bitwidth, driving security, interoperability across curves, and future-proof cryptographic workloads.
Activity
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Quality Metrics
Correctness92.2%
Maintainability88.8%
Architecture91.2%
Performance84.4%
AI Usage20.0%
Skills & Technologies
Programming Languages
BazelC++MLIRMarkdownRust
Technical Skills
Arithmetic optimizationBigInt ArithmeticBuild SystemsBuild systemsCircuit DesignCircuit designCode GenerationCompiler developmentCryptographyDocumentationEmbedded systemsLow-level ProgrammingLow-level programmingMLIRTesting
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