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Constant Time Analysis

Listed
trailofbits·vlatest·security·CC-BY-SA-4.0

Rapidly assesses code snippets for potential vulnerabilities and inefficiencies without performance degradation.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add trailofbits/skills --skill constant-time-analysis -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

trailofbits

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill failed 1 of 6 checks. A failure is not proof of bad intent; it means something in the code needs a human to look at it before you run it.

  • No undeclared network calls: failed

    Contacts 1 host that is neither well-known infrastructure nor declared in the skill's frontmatter: pecl.php.net.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

    Hosts contacted

    pecl.php.netundeclared

    What it found

    • plugins/constant-time-analysis/skills/constant-time-analysis/references/php.md:17contacts pecl.php.net
      VLD_VERSION=$(curl -fsS https://pecl.php.net/package/vld |

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned trailofbits/skills at 82fe822625.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
82fe822625
Manifest
plugins/constant-time-analysis/skills/constant-time-analysis/SKILL.md
Scanned
11 files, 1,856 lines
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill enables AI agents to perform constant-time analysis. It allows for consistent and predictable execution regardless of input data, preventing information leakage based on runtime behavior. This is particularly useful when dealing with sensitive data or security-critical operations where timing variations could be exploited.

When to use it

  • Analyzing cryptographic implementations to detect timing vulnerabilities.
  • Evaluating the performance of algorithms that should have consistent execution times.
  • Debugging code where unexpected timing differences are causing issues.
  • Auditing systems for potential side-channel attacks based on timing information.

Key capabilities

  • Constant-time execution
  • Runtime analysis
  • Vulnerability detection (timing attacks)

Example prompts

  • "Analyze this cryptographic function for constant-time behavior."
  • "Can you identify any timing dependencies in this sorting algorithm?"
  • "Perform a constant-time analysis of the password comparison routine."

Tips & gotchas

This skill requires a solid understanding of security principles and potential side-channel attack vectors. It’s most effective when applied to code that handles sensitive data or performs critical operations.