---
title: "Constant-Time Testing - Air Market"
description: "Some cryptographic code gives away secrets by how long it takes to run. That is a timing side channel, and it is hard to spot by reading. This tests for it. Reach for it when you are auditing a crypt…"
canonical: "https://airmarket.ai/app/constant-time-testing"
---

[Air Market](/) / [Security](/category/security) / Constant-Time Testing

Skill by [Trail of Bits](/@trailofbits)

# Constant-Time Testing

Find out whether your crypto code leaks through its timing

## What this does

Some cryptographic code gives away secrets by how long it takes to run. That is a timing side channel, and it is hard to spot by reading. This tests for it. Reach for it when you are auditing a crypto implementation and want to know whether timing is one of its weaknesses.

### Top 3 things it does for you

- Check crypto code for timing side channels
- Test whether an operation runs in constant time

## Information

**Constant-Time Testing at a glance**

|  |  |
| --- | --- |
| Kind | Skill |
| Publisher | [Trail of Bits](/@trailofbits) |
| Category | [Security](/category/security) |
| Works with | Agent Skills - an open standard supported by 40+ agents |
| Size | 24 KB |
| Licence | CC-BY-SA-4.0 |
| Repository | [trailofbits/skills](https://github.com/trailofbits/skills/tree/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/constant-time-testing) |
| GitHub stars | 6,823 (as of Nov 2026) |
| Installs | 5,604, counted by skills.sh (Nov 2026) |

## Security report

**Verified.** AIR scanned this exact version of Constant-Time Testing and flagged nothing. AIR's verdict: **safe**.

**What Constant-Time Testing's check was run against**

|  |  |
| --- | --- |
| Commit | d5fe2e6a7896236c3102fd5477e833623ad70298 |
| Content hash | 95f93bfbea34981f6b5b9f595a4a7fa10a31523421121a3d661347256d0495df |
| Files read | [Browse the files at this exact commit](https://github.com/trailofbits/skills/blob/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/constant-time-testing/SKILL.md) |

A scan is named by the exact content it read, not by a version number. A different version is a different artifact, and nothing here applies to a version AIR has not scanned.

[Read the full security report for Constant-Time Testing](/security/constant-time-testing)

## About Constant-Time Testing

Constant-time testing detects timing side channels in cryptographic code.

Use it when auditing crypto implementations for timing vulnerabilities.

## What's inside

- SKILL.md - instructions
- agents/openai.yaml - data
- assets/trail-of-bits-mark.svg - template

## Questions

### Is Constant-Time Testing safe to install?

AIR scanned this exact version of Constant-Time Testing and flagged nothing. AIR's verdict: safe. The verdict is named by the content that was read, at commit d5fe2e6a7896, so it cannot drift onto a version nobody scanned. The full report is at https://airmarket.ai/security/constant-time-testing.

### How do I install Constant-Time Testing?

Open https://airmarket.ai/app/constant-time-testing on Air Market and use the install action: Air Market hands Claude a prompt naming this exact skill, and Claude sets it up. Source, pinned to the exact commit this listing describes: https://github.com/trailofbits/skills/tree/d5fe2e6a7896236c3102fd5477e833623ad70298/plugins/testing-handbook-skills/skills/constant-time-testing. Install from that link, not the branch.

## Related on Air Market

- [More Security listings](/category/security)
- [Everything by Trail of Bits](/@trailofbits)

---

Canonical URL: <https://airmarket.ai/app/constant-time-testing>