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QualityPython

Constant-Time Analysis

by trailofbits

Constant-Time Analysis is a Quality skill for Claude Code, published by trailofbits in skills.

6.6K stars567 forkson trailofbits/skillsAdded 2026/08/15Repository updated 2026/08/14
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agent-skills
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Install Constant-Time Analysis
Copy Constant-Time Analysis into your Claude Code skills folder. Run the command in your terminal, or review the source on GitHub before installing.
terminal
npx degit https://github.com/trailofbits/skills/tree/main/plugins/constant-time-analysis/skills/constant-time-analysis ~/.claude/skills/constant-time-analysis

Requires Node.js. Downloads this skill only — not the rest of the repository — into your Claude Code skills folder.

Without Node.js

git clone https://github.com/trailofbits/skills.git

Clones the whole repository, then copy the skill’s own directory into your skills folder yourself.

In this catalog

Source file
plugins/constant-time-analysis/skills/constant-time-analysis/SKILL.md in trailofbits/skills
Installs to
~/.claude/skills/constant-time-analysis
Collection
One of 25 skills cataloged from this repository
Category
Quality — 1354 skills

What Constant-Time Analysis does

Constant-Time Analysis detects timing side-channel vulnerabilities in cryptographic code by statically inspecting compiled output for variable-time instructions. Use it when implementing or reviewing crypto routines, division on secrets, or secret-dependent branches.

Constant-Time Analysis is cataloged under Quality on DirSkills. Constant-Time Analysis comes from a repository tagged agent-skills.

Documentation

README

Constant-Time Analysis

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.

When to Use

  • Implementing or reviewing a signature, encryption, KEM, or key derivation routine
  • Code applies / or % to a value derived from a key, plaintext, nonce, or token
  • The user mentions "constant-time", "timing attack", "side-channel", or "KyberSlash"
  • Reviewing functions named sign, verify, encrypt, decrypt, derive_key

This is the opening of the README. Read the full README on GitHub.

Frequently asked about Constant-Time Analysis

  • What else does trailofbits publish alongside Constant-Time Analysis?

    Constant-Time Analysis is one of 25 skills that DirSkills catalogs from trailofbits/skills, the repository it ships in. Its siblings there include Agentic Actions Auditor, Algorand Vulnerability Scanner and Audit Context Building. Each one is a separate skill with its own page in this directory, installs the same way Constant-Time Analysis does, and is maintained by trailofbits in that same repository. The rest of the collection is listed on the trailofbits/skills page.

  • How does Constant-Time Analysis compare to other Quality skills?

    Constant-Time Analysis ranks #250 by stars among the 1354 Quality skills in this catalog. The most-starred ones next to it are Benchmark, Benchmark Optimization Loop and API Design Patterns. DirSkills ranks by the star count of the repository each skill ships in, so that order reflects how popular those repositories are rather than any review of Constant-Time Analysis against them. Open each page to compare what they document and how they install.

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