Overview
constant-time-analysis is an open-source backend skill for Claude Code and compatible agents, published by trailofbits. Its author describes it as: “Detects timing side-channel vulnerabilities in cryptographic code. Use when implementing or reviewing crypto code, encountering division on secrets, secret-dependent branches, or constant-time programming questions in…”. The project has 6.6k stars on GitHub and is available under the CC-BY-SA-4.0 license. Add it to your setup with `/plugin marketplace add trailofbits/skills`.
What constant-time-analysis does
Compile the code, inspect the emitted assembly or bytecode for variable-time instructions, then decide which of the flagged operations actually touch secrets. The compilation step is mechanical; the triage step is the work.
What’s inside
The SKILL.md for constant-time-analysis is organised into these sections:
- When to Use
- When NOT to Use
- Language Routing
- Running the Analyzer
- Per-language coverage limits
- Prerequisites
- Interpreting Results
- Triaging Findings
- Limitations
- Real-World Impact
- References
Installation
Add constant-time-analysis to your agent with:
/plugin marketplace add trailofbits/skillsReview a skill’s source before installing it — skills can instruct your agent to run commands. This command comes from the skill’s public repository, which is the source of truth for setup steps. New to skills? Read how to install Claude Code skills.
Supported agents
- Claude Code — ships a claude code plugin marketplace
License
constant-time-analysis is published under the CC-BY-SA-4.0 license.
Strengths
- Clear CC-BY-SA-4.0 license — safe to read and adapt within its terms
- Ships in trailofbits/skills, an established project with 6,646 GitHub stars
- Works with Claude Code
- Actively maintained — repository updated in the last 90 days
Author
Topics
Frequently asked questions
- What does constant-time-analysis do?
- Detects timing side-channel vulnerabilities in cryptographic code. Use when implementing or reviewing crypto code, encountering division on secrets, secret-dependent branches, or constant-time programming questions in C, C++, Go, Rust, Swift, Java, Kotlin, C#, PHP, JavaScript, TypeScript, Python, or Ruby.
- How do I install constant-time-analysis?
- Run /plugin marketplace add trailofbits/skills in your agent, then reload your skills. Review the source at https://github.com/trailofbits/skills before installing.
- Is constant-time-analysis free to use?
- Yes. constant-time-analysis is free and open source under the CC-BY-SA-4.0 license, so you can read, run, and adapt it within that license's terms.
- Which agents does constant-time-analysis work with?
- constant-time-analysis lists Claude Code — named in its SKILL.md, its plugin marketplace or its repository topics. Skills use the portable SKILL.md format, so other agents that read that format may load it too.
- Where does constant-time-analysis come from?
- constant-time-analysis ships inside trailofbits/skills, a repository that contains 41 catalogued skills in total. The repository's 6,646 GitHub stars apply to that whole collection, not to this skill on its own.
