constant-time-analysis SKILL.md skillA
constant-time-analysis from trailofbits/skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add trailofbits/skills/constant-time-analysis@git:20260803.9ea55c5Pins git:20260803.9ea55c5 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- trailofbits/skills
- Path
plugins/constant-time-analysis/skills/constant-time-analysis/SKILL.md- Versions recorded
- 2
- Latest version
- git:20260803.9ea55c5, committed Aug 3, 2026
- First version recorded
- Jan 14, 2026
- Size
- 13,204 bytes
- Repository stars
- 7,698
- License
- CC-BY-SA-4.0
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.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# 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` ## When NOT to Use - **Measuring** timing variance on a running binary — use the `constant-time-testing` skill from the `testing-handbook-skills` plugin, which covers dudect and statistical approaches and may not be installed. This skill inspects compiler output statically and never executes the code under test. - Non-cryptographic code, or crypto code where every input is public - High-level API usage where a vetted library owns the constant-time guarantees - Cache and other microarchitectural side channels — the assembly view cannot see them ## Language Routing …
Read the whole file at its exact version.
How to install
mdr add trailofbits/skills/constant-time-analysis@sha256:4807f710a234e252The line at the top of this page pins the label git:20260803.9ea55c5, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_spa42bhew3kaxd64)
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Versions
The registry has recorded 2 versions of this file, between Jan 14, 2026 and Aug 3, 2026, about one every 201 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260803.9ea55c5 latest | 2026-08-03 | 9ea55c5 | 13,204 B | A | view · diff |
| git:20260114.695119c | 2026-01-14 | 695119c | 9,948 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (13204 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
trailofbits/skills · 7,698 stars · license CC-BY-SA-4.0 · pushed 2026-10-22 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_spa42bhew3kaxd64 GET https://markdownregistry.com/api/v1/resolve?ref=trailofbits/skills/constant-time-analysis GET https://markdownregistry.com/api/v1/blob/4807f710a234e2520d7e163cc5a0e55785a495b2790dadcd7f0952dd6bff8d07
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.
More from trailofbits/skills
Every file in trailofbits/skills