Cryptokit

Q: What is a Claude Code skill and how does the Cryptokit skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Cryptokit is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at https://claudskills.com/learn/what-is-skill-md/.

Category: Security · Sub-category: security-misc · Last updated: 2026-05-21

Perform cryptographic operations using Apple CryptoKit. Use when hashing data with SHA256/SHA384/SHA512, generating HMAC authentication codes, encrypting with AES-GCM or ChaChaPoly, signing with P256/P384/P521/Curve25519 keys, performing ECDH key agreement, storing keys in the Secure Enclave, or migrating from CommonCrypto to CryptoKit.

From the source SKILL.md

Apple CryptoKit provides a Swift-native API for cryptographic operations: hashing, message authentication, symmetric encryption, public-key signing, key agreement, and Secure Enclave key storage. Available on iOS 13+. Prefer CryptoKit over CommonCrypto or raw Security framework APIs in all new code targeting Swift 6.3+.

What this skill does

Cryptokit is a community-contributed Claude Code skill in the security-misc sub-category. It ships as a SKILL.md file that Claude Code auto-discovers under ~/.claude/skills/cryptokit/ and loads when your prompt matches the skill's trigger.

When to invoke it: Use when hashing data with SHA256/SHA384/SHA512, generating HMAC authentication codes, encrypting with AES-GCM or ChaChaPoly, signing with P256/P384/P521/Curve25519 keys, performing ECDH key agreement, storing keys in the Secure Enclave, or migrating from CommonCrypto to CryptoKit.

Who uses this skill

The Cryptokit Claude Code skill is built for security engineers, penetration testers, DevSecOps practitioners, and development teams hardening codebases and infrastructure. It's part of ClaudSkills (also referred to as Claude Skills or Claude Code Skills) — the open community-curated registry of 116,000+ SKILL.md files for Anthropic's Claude Code agent and the wider Claude ecosystem (Claude API, Claude Agent SDK).

How to install

Free

Manual install (2 steps)

mkdir -p ~/.claude/skills/cryptokit
curl -L https://claudskills.com/skills/cryptokit/SKILL.md \
  -o ~/.claude/skills/cryptokit/SKILL.md

Or just download SKILL.md directly and drop it into ~/.claude/skills/cryptokit/. Claude Code auto-discovers it on next session.

Skills live at ~/.claude/skills/cryptokit/SKILL.md on macOS/Linux, or %USERPROFILE%\.claude\skills\cryptokit\SKILL.md on Windows. See the full install guide for step-by-step instructions.

📱 Install from your phone or desktop Telegram

Open @claudskills_bot on Telegram, tap Open Desktop App, and the desktop app installs this skill for you. Or share the bot link with a colleague — they get the same one-tap install. Learn more →

Pro

One-click install via the desktop app

The ClaudSkills desktop app installs any skill directly into ~/.claude/skills/ with one click — no terminal required. Pro starts at $9/mo or $149 lifetime.

Pro

For the full experience including quality scoring and one-click install features for each skill — upgrade to Pro.

See pricing → Download desktop app

Frequently asked questions

How do I install the Cryptokit Claude Code skill?

Install via the ClaudSkills desktop app (one click) or copy SKILL.md from the source repository to ~/.claude/skills/cryptokit/SKILL.md and restart Claude Code. Both flows are detailed at claudskills.com/install/.

What does the Cryptokit skill do?

Is this skill free to install?

Yes. ClaudSkills is an open registry — every skill keeps its source repository's license, and manual install via copy is free. ClaudSkills Pro ($9/mo, $79/yr, or $149 one-time) adds one-click install via the desktop app and a multi-signal Quality Score.

When should I use the Cryptokit skill?

Use Cryptokit when your Claude Code task falls under the Security category — specifically in the security misc area. Claude Code auto-discovers installed skills and invokes the right one based on the task description, so you can also ask Claude directly (e.g. "use Cryptokit" or describe the task and let Claude pick). Browse related skills at /category/security/.

What is a Claude Code skill and how does the Cryptokit skill fit in?

A Claude Code skill is a SKILL.md file that lives under ~/.claude/skills/<name>/ and tells the Claude Code CLI agent how to perform a specific task (instructions, prompts, allowed tools). Skills are auto-discovered at session start. Cryptokit is one of 67,000+ skills indexed in the open ClaudSkills catalog, classified under the Security category. Learn more at /learn/what-is-a-claude-skill/.

Cite this skill

If you reference this skill in a blog post, paper, or documentation, you can cite it as:

APA

ClaudSkills. (2026). Cryptokit [Claude Code skill]. ClaudSkills. https://claudskills.com/skills/cryptokit/

BibTeX

@misc{cryptokit-2026,
  author    = {ClaudSkills},
  title     = {Cryptokit [Claude Code skill]},
  year      = {2026},
  publisher = {ClaudSkills},
  url       = {https://claudskills.com/skills/cryptokit/}
}

Embed this skill

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Badge

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