EasyCrypt/easycrypt
Aug 2023 – Jan 2026
7 Months active
Languages Used
CoqOCamlEasyCryptML
Technical Skills
Coqcontext managementformal verificationfunctional programmingproof assistanttesting
Oskar Goldhahn
PROFILE
Oskar Goldhahn
Oskar Goldhahn contributed to the EasyCrypt/easycrypt repository by designing and refactoring core components for formal verification and memory management. He enhanced the logic module to reduce axioms and introduced new operations for more robust theorem proving, using OCaml and Coq. Oskar improved code maintainability by generalizing formula handling and enabling explicit memory bindings in program logic statements, which allowed users to reason directly about memory states. His work included targeted bug fixes, expanded test coverage, and improved error handling, demonstrating depth in functional programming, parsing, and type system design while strengthening the reliability and extensibility of the verification pipeline.
Overall Statistics
Feature vs Bugs
70%Features
Repository Contributions
14Total
Bugs
3
Commits
14
Features
7
Lines of code
8,177
Activity Months7
Your Network
23 peopleSame Organization
@ntnu.no5
Work History
January 2026
2 Commits • 1 Features
Jan 1, 2026Month: 2026-01 — EasyCrypt/easycrypt delivered targeted improvements to memory-model reasoning focused on reliability of equivalence symmetry and variable substitutions. This month combined a critical bug fix with a new usability improvement, supported by expanded test coverage and concrete commits for traceability.
2 Commits • 1 Features
Jan 1, 2026Month: 2026-01 — EasyCrypt/easycrypt delivered targeted improvements to memory-model reasoning focused on reliability of equivalence symmetry and variable substitutions. This month combined a critical bug fix with a new usability improvement, supported by expanded test coverage and concrete commits for traceability.
January 2026
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 — EasyCrypt/easycrypt monthly summary: Key feature delivered: Two-Sided Formula Generalization. Refactored core formula handling to support a robust two-sided pattern, improving generalization, correctness, and mathematical reasoning. Commit: 4fc8b636e76ee1689c97089282809532cc4d3c5c. Major bugs fixed: none reported this month. Overall impact: strengthened the formula engine, enabling broader formal proofs and reducing edge cases in casting between single- and two-sided forms. Skills demonstrated: refactoring, pattern-based casting, formal reasoning, and maintaining API stability.
December 2025
1 Commits • 1 Features
Dec 1, 2025December 2025 — EasyCrypt/easycrypt monthly summary: Key feature delivered: Two-Sided Formula Generalization. Refactored core formula handling to support a robust two-sided pattern, improving generalization, correctness, and mathematical reasoning. Commit: 4fc8b636e76ee1689c97089282809532cc4d3c5c. Major bugs fixed: none reported this month. Overall impact: strengthened the formula engine, enabling broader formal proofs and reducing edge cases in casting between single- and two-sided forms. Skills demonstrated: refactoring, pattern-based casting, formal reasoning, and maintaining API stability.
November 2025
5 Commits
Nov 1, 2025Month: 2025-11 — Focused on robustness and correctness in EasyCrypt/easycrypt. Implemented targeted error handling and user-facing messages, improved edge-case argument handling in core modules, and expanded tests to verify correctness in PRG and Phoare logic scenarios. These changes reduce support overhead, improve reliability for users, and position the project for safer future feature work.
5 Commits
Nov 1, 2025Month: 2025-11 — Focused on robustness and correctness in EasyCrypt/easycrypt. Implemented targeted error handling and user-facing messages, improved edge-case argument handling in core modules, and expanded tests to verify correctness in PRG and Phoare logic scenarios. These changes reduce support overhead, improve reliability for users, and position the project for safer future feature work.
November 2025
October 2025
1 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for EasyCrypt/easycrypt: Delivered explicit memory bindings in program logic statements by enhancing the parser and AST to represent optional memory bindings within logical assertions. This enables users to inspect and reason about memory states directly in their logic expressions. No major bugs fixed this month; feature-driven delivery with a focus on improving memory-state reasoning and user-facing diagnostics.
October 2025
1 Commits • 1 Features
Oct 1, 2025October 2025 monthly summary for EasyCrypt/easycrypt: Delivered explicit memory bindings in program logic statements by enhancing the parser and AST to represent optional memory bindings within logical assertions. This enables users to inspect and reason about memory states directly in their logic expressions. No major bugs fixed this month; feature-driven delivery with a focus on improving memory-state reasoning and user-facing diagnostics.
September 2025
1 Commits • 1 Features
Sep 1, 2025September 2025 — Focus on invariant-based memory handling refinements in EasyCrypt/easycrypt. Delivered a foundational refactor to support invariant-bound memory with new ss_inv and ts_inv types and mapping functions, removing hardcoded memory bindings from program logic statements. This enables memory bindings to travel with invariants, improving maintainability and correctness, and sets the stage for invariant-driven reasoning across the codebase.
1 Commits • 1 Features
Sep 1, 2025September 2025 — Focus on invariant-based memory handling refinements in EasyCrypt/easycrypt. Delivered a foundational refactor to support invariant-bound memory with new ss_inv and ts_inv types and mapping functions, removing hardcoded memory bindings from program logic statements. This enables memory bindings to travel with invariants, improving maintainability and correctness, and sets the stage for invariant-driven reasoning across the codebase.
September 2025
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for EasyCrypt/easycrypt: Delivered a major Logic module refactor to enhance robustness of the SMT backend and improve maintainability. The work focused on reducing axioms, introducing a new operation choicebd, and redefining choiceb to rely on it, along with clarifications to related lemmas. Additionally, choiceb is now treated as opaque by the SMT solver to prevent regressions and strengthen soundness. These changes simplify reasoning, reduce potential regressions, and support future feature development and performance improvements in the verification pipeline.
March 2025
2 Commits • 1 Features
Mar 1, 2025March 2025 monthly summary for EasyCrypt/easycrypt: Delivered a major Logic module refactor to enhance robustness of the SMT backend and improve maintainability. The work focused on reducing axioms, introducing a new operation choicebd, and redefining choiceb to rely on it, along with clarifications to related lemmas. Additionally, choiceb is now treated as opaque by the SMT solver to prevent regressions and strengthen soundness. These changes simplify reasoning, reduce potential regressions, and support future feature development and performance improvements in the verification pipeline.
August 2023
2 Commits • 2 Features
Aug 1, 2023August 2023 — EasyCrypt/easycrypt: Delivered two key features focused on readability and context usability. The Code Readability Enhancement replaces 'axiomatized by' with '[opaque]' across definitions and adds trivial lemmas to preserve behavior (commit 4f84b7c7cc054866ca24419bd26d0f2c1f16aaec). The Context Management Enhancement adds a new 'clear' operation to remove unused items from the context with inclusion/exclusion filters, applied recursively (commit 7e6bf7318b9cc20a423efe3f5a0ad4ae9de98e67).
2 Commits • 2 Features
Aug 1, 2023August 2023 — EasyCrypt/easycrypt: Delivered two key features focused on readability and context usability. The Code Readability Enhancement replaces 'axiomatized by' with '[opaque]' across definitions and adds trivial lemmas to preserve behavior (commit 4f84b7c7cc054866ca24419bd26d0f2c1f16aaec). The Context Management Enhancement adds a new 'clear' operation to remove unused items from the context with inclusion/exclusion filters, applied recursively (commit 7e6bf7318b9cc20a423efe3f5a0ad4ae9de98e67).
August 2023
Activity
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Quality Metrics
Correctness85.8%
Maintainability84.2%
Architecture84.2%
Performance77.8%
AI Usage22.8%
Skills & Technologies
Programming Languages
CoqEasyCryptMLOCaml
Technical Skills
Abstract Data TypesAbstract Syntax TreesCode MaintainabilityCompiler DevelopmentCoqFormal VerificationLogicLogic ProgrammingMemory ManagementOCamlParsingRefactoringTheorem ProvingType System Designalgorithm design
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