openssl/openssl
Aug 2025 – Feb 2026
6 Months active
Languages Used
AssemblyPerl
Technical Skills
Assembly Language ProgrammingCryptographyPerformance OptimizationRISC-VAssemblyDocumentation
zhoulu
PROFILE
Zhoulu
Contributed to the openssl/openssl repository by delivering performance optimizations and maintainability improvements for cryptographic routines on RISC-V architecture. Focused on assembly language programming, the work included optimizing AES-128-CBC and SM4-CBC decryption and encryption, introducing batch processing, instruction reordering, and efficient key handling to increase throughput and reduce latency. Enhanced code clarity and maintainability by updating assembly documentation and correcting code comments, supporting safer future development. Collaborated through peer-reviewed pull requests, ensuring alignment with OpenSSL standards. Leveraged expertise in assembly, cryptography, and performance optimization to address both low-level efficiency and long-term codebase reliability in security-critical paths.
Overall Statistics
Feature vs Bugs
67%Features
Repository Contributions
7Total
Bugs
2
Commits
7
Features
4
Lines of code
911
Activity Months6
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Shared Repositories
365
Work History
February 2026
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary focusing on maintainability improvements in cryptographic routines within the openssl/openssl repository. Implemented a targeted change to AES RISC-V decryption by clarifying how plaintext blocks are stored through updated assembly comments, enabling safer future maintenance and reducing risk of misinterpretation. The work followed OpenSSL contribution practices and involved peer reviews and merge from a related PR (30194).
1 Commits • 1 Features
Feb 1, 2026February 2026 monthly summary focusing on maintainability improvements in cryptographic routines within the openssl/openssl repository. Implemented a targeted change to AES RISC-V decryption by clarifying how plaintext blocks are stored through updated assembly comments, enabling safer future maintenance and reducing risk of misinterpretation. The work followed OpenSSL contribution practices and involved peer reviews and merge from a related PR (30194).
February 2026
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly recap for openssl/openssl: Delivered SM4-CBC decryption optimization for the RISC-V architecture. This included instruction reordering and redesigned intermediate data handling to reduce latency and improve data handling efficiency. The change was committed as f1482a709d5e7c407948f50b155c8c9b086e6566 and merged from PR 29544, with reviews by Neil Horman and Paul Dale.
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly recap for openssl/openssl: Delivered SM4-CBC decryption optimization for the RISC-V architecture. This included instruction reordering and redesigned intermediate data handling to reduce latency and improve data handling efficiency. The change was committed as f1482a709d5e7c407948f50b155c8c9b086e6566 and merged from PR 29544, with reviews by Neil Horman and Paul Dale.
December 2025
2 Commits • 1 Features
Dec 1, 2025In December 2025, delivered SM4-CBC encryption/decryption performance optimizations for OpenSSL on RISC-V. Implementations included assembly-level enhancements, batch processing of blocks, optimized key loading, and an improved IV update method, all while maintaining SM4 compliance. Two commits were merged from PRs with comprehensive code reviews by Tomas Mraz, Paul Dale, and Neil Horman, resulting in significantly higher throughput on RISC-V and more efficient cryptographic operations in OpenSSL.
2 Commits • 1 Features
Dec 1, 2025In December 2025, delivered SM4-CBC encryption/decryption performance optimizations for OpenSSL on RISC-V. Implementations included assembly-level enhancements, batch processing of blocks, optimized key loading, and an improved IV update method, all while maintaining SM4 compliance. Two commits were merged from PRs with comprehensive code reviews by Tomas Mraz, Paul Dale, and Neil Horman, resulting in significantly higher throughput on RISC-V and more efficient cryptographic operations in OpenSSL.
December 2025
November 2025
1 Commits
Nov 1, 2025Monthly performance summary for 2025-11 focusing on the openssl/openssl repository. Delivered targeted improvements to cryptographic assembly documentation, reinforcing accuracy and maintainability in a security-critical path.
November 2025
1 Commits
Nov 1, 2025Monthly performance summary for 2025-11 focusing on the openssl/openssl repository. Delivered targeted improvements to cryptographic assembly documentation, reinforcing accuracy and maintainability in a security-critical path.
September 2025
1 Commits
Sep 1, 2025September 2025 — openssl/openssl: Key features delivered: none this month. Major bugs fixed: corrected a typo in a code comment (ta to tu) in ghash-riscv64-zvkg.pl (vsetivli), no functional changes. Overall impact: improved documentation accuracy and developer understanding with unchanged runtime behavior; maintained traceability via commit 7e21ddb05e4a5fb8f2e50d9359c76fd6f3897ab6. Technologies/skills: meticulous code review, precise documentation edits, and change-traceable commits in a cryptography-focused repository.
1 Commits
Sep 1, 2025September 2025 — openssl/openssl: Key features delivered: none this month. Major bugs fixed: corrected a typo in a code comment (ta to tu) in ghash-riscv64-zvkg.pl (vsetivli), no functional changes. Overall impact: improved documentation accuracy and developer understanding with unchanged runtime behavior; maintained traceability via commit 7e21ddb05e4a5fb8f2e50d9359c76fd6f3897ab6. Technologies/skills: meticulous code review, precise documentation edits, and change-traceable commits in a cryptography-focused repository.
September 2025
August 2025
1 Commits • 1 Features
Aug 1, 2025Monthly work summary for 2025-08 focusing on feature delivery and performance improvements in openssl/openssl. Notable achievement: AES-128-CBC decryption optimization on RISC-V using Zvkned, introducing aes_128_decrypt_6 to process larger data chunks and boost throughput. Commit: 5f99d76e2854db92aa7679c7229b9bd38a297950. No major bug fixes reported for this period. Impact includes higher decryption throughput, reduced latency for cryptographic workloads on RISC-V platforms, and better energy efficiency per decrypted block. Techniques demonstrated include architecture-specific optimization, cryptographic code optimization, performance profiling, and OpenSSL codebase contributions.
August 2025
1 Commits • 1 Features
Aug 1, 2025Monthly work summary for 2025-08 focusing on feature delivery and performance improvements in openssl/openssl. Notable achievement: AES-128-CBC decryption optimization on RISC-V using Zvkned, introducing aes_128_decrypt_6 to process larger data chunks and boost throughput. Commit: 5f99d76e2854db92aa7679c7229b9bd38a297950. No major bug fixes reported for this period. Impact includes higher decryption throughput, reduced latency for cryptographic workloads on RISC-V platforms, and better energy efficiency per decrypted block. Techniques demonstrated include architecture-specific optimization, cryptographic code optimization, performance profiling, and OpenSSL codebase contributions.
Activity
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Quality Metrics
Correctness100.0%
Maintainability88.6%
Architecture97.2%
Performance100.0%
AI Usage20.0%
Skills & Technologies
Programming Languages
AssemblyPerl
Technical Skills
AssemblyAssembly Language ProgrammingCryptographyDocumentationPerformance OptimizationRISC-VRISC-V architectureassembly languagecryptographylow-level programmingperformance optimization
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