iOS Security
HoangNguyen0403/agent-skills-standard
Secure iOS apps with secure storage, biometrics, and data protection.
Use Apple CryptoKit for Swift cryptographic primitives. An agent skill from dpearson2699/swift-ios-skills.
Install Cryptokit
$ npx skills add dpearson2699/swift-ios-skills --skill cryptokit -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install dpearson2699/swift-ios-skills cryptokit --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/dpearson2699/swift-ios-skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/skills/cryptokit .claude/skills/cryptokit && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "cryptokit" agent skill from https://github.com/dpearson2699/swift-ios-skills/tree/main/skills/cryptokit into .claude/skills/cryptokit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cryptokit", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/dpearson2699/swift-ios-skills/tree/main/skills/cryptokitType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add dpearson2699/swift-ios-skills --skill cryptokit -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install dpearson2699/swift-ios-skills cryptokit --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dpearson2699/swift-ios-skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/skills/cryptokit .agents/skills/cryptokit && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "cryptokit" agent skill from https://github.com/dpearson2699/swift-ios-skills/tree/main/skills/cryptokit into .agents/skills/cryptokit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cryptokit", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add dpearson2699/swift-ios-skills --skill cryptokit -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install dpearson2699/swift-ios-skills cryptokit --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dpearson2699/swift-ios-skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/skills/cryptokit .cursor/skills/cryptokit && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "cryptokit" agent skill from https://github.com/dpearson2699/swift-ios-skills/tree/main/skills/cryptokit into .cursor/skills/cryptokit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cryptokit", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/dpearson2699/swift-ios-skills.git --path skills/cryptokit--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add dpearson2699/swift-ios-skills --skill cryptokit -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install dpearson2699/swift-ios-skills cryptokit --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dpearson2699/swift-ios-skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/skills/cryptokit .gemini/skills/cryptokit && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "cryptokit" agent skill from https://github.com/dpearson2699/swift-ios-skills/tree/main/skills/cryptokit into .gemini/skills/cryptokit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cryptokit", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install dpearson2699/swift-ios-skills cryptokitInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add dpearson2699/swift-ios-skills --skill cryptokit -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/dpearson2699/swift-ios-skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/skills/cryptokit .github/skills/cryptokit && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "cryptokit" agent skill from https://github.com/dpearson2699/swift-ios-skills/tree/main/skills/cryptokit into .github/skills/cryptokit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cryptokit", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add dpearson2699/swift-ios-skills --skill cryptokit -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install dpearson2699/swift-ios-skills cryptokit --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/dpearson2699/swift-ios-skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/skills/cryptokit .opencode/skills/cryptokit && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "cryptokit" agent skill from https://github.com/dpearson2699/swift-ios-skills/tree/main/skills/cryptokit into .opencode/skills/cryptokit/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "cryptokit", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
cryptokit- GitHub stars
- 1.2k
- Token cost
- ~3.6k tokens
- SKILL.md length
- 893 words
- Files
- 3 (incl. references)
- Skills in repo
- 86
- Repo updated
- First seen
- Licence
- Custom licence
At a glance
Use Apple CryptoKit for Swift cryptographic primitives. An agent skill from dpearson2699/swift-ios-skills.
- Works in 6 steps: Using the shared secret directly as a key → Reusing nonces → Ignoring authentication tag verification → …
- Hashing with SHA-2
- SKILL.md covers Contents, Hashing, HMAC and Symmetric Encryption, plus 5 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Cryptokit is an agent skill from dpearson2699/swift-ios-skills. Use Apple CryptoKit for Swift cryptographic primitives. Use when hashing with SHA-2 or SHA-3, generating HMACs, encrypting with AES-GCM or ChaChaPoly, signing with P256/P384/P521/Curve25519 or ML-DSA keys, performing ECDH, HPKE, ML-KEM, or X-Wing key exchange, using Secure Enclave CryptoKit keys, or migrating CommonCrypto code to CryptoKit.
Its SKILL.md is about 3.6k tokens, which your agent loads only when the skill is triggered. The skill folder holds 4 other files, including reference files (for example `evals/evals.json` and `references/cryptokit-patterns.md`).
It sits in Mobile, covering Cryptography and iOS development. It works with iOS. The repository describes itself as: Agent Skills for iOS 26+, Swift 6.3, SwiftUI, and modern Apple frameworks.
When your agent uses it
- Hashing with SHA-2
- Generating HMACs
- Encrypting with AES-GCM
- Signing with P256/P384/P521/Curve25519
Example prompts
- “/cryptokit”
Workflow steps
6 steps, taken from the step headings in SKILL.md.
- Using the shared secret directly as a key
- Reusing nonces
- Ignoring authentication tag verification
- Using Insecure hashes for security
- Storing symmetric keys in UserDefaults
- Not checking Secure Enclave availability
What it can do on your machine
Read from SKILL.md and the folder at commit 8d90fd1. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md (its code samples are swift).
From the folder's file list and the shell code blocks in SKILL.md.
Network
Links to these hosts (documentation or services it may open):
sosumi.ai
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Cryptokit loads about 3.6k tokens when it runs, and up to ~7.9k if it reads all its reference files. Until then it costs about 88 tokens; SKILL.md has 893 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Its licence (Custom licence) doesn't allow us to republish the file, so here is its outline and opening line. It has 893 words (~3,558 tokens).
“Apple CryptoKit provides a Swift-native API for cryptographic operations: hashing, message authentication, symmetric encryption, public-key signing, key agreement, HPKE, quantum-secure key encapsulation/signing, and Secure Enclave-backed keys. Most core primitives are available on iOS 13+; check availability for HPKE (iOS 17+)…”
- name
- cryptokit
Files
SKILL.md and 2 other files (references) in skills/cryptokit of dpearson2699/swift-ios-skills.
- SKILL.md
- evals/evals.json
- references/cryptokit-patterns.md
Open the folder on GitHubat commit 8d90fd1
Compare with similar skills
Cryptokit next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Cryptokit this skilldpearson2699/swift-ios-skills | 1.2k | — | ~3.6k | Automated safety check: Pass | Custom licence | |
| iOS SecurityHoangNguyen0403/agent-skills-standard | 571 | — | ~500 | Automated safety check: Pass | MIT | |
| Hig Project Contextraintree-technology/hig-doctor | 143 | 5 repos | ~1.2k | Automated safety check: Pass | MIT | |
| Hig Components Contentraintree-technology/hig-doctor | 143 | 5 repos | ~1.3k | Automated safety check: Pass | MIT | |
| iOS Simulator Skilln0an/VivaDicta | 131 | 1 repos | ~2.5k | Automated safety check: Pass | MIT | |
| Inspector Implementationipedro/Inspector | 170 | — | ~729 | Automated safety check: Pass | MIT |
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Hig Project Context
raintree-technology/hig-doctor
Create or update a shared Apple design context document that other HIG skills use to tailor guidance.
Hig Components Content
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Apple Human Interface Guidelines for content display components.
iOS Simulator Skill
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21 production-ready scripts for iOS app testing, building, and automation.
Inspector Implementation
ipedro/Inspector
A skill your agent uses when an agent needs to implement or modify the Inspector library itself — panel UI, hierarchy/runtime behavior, custom property models, macros, or Example-app dogfooding.
Run iOS Simulator
iPlug2/iPlug2OOS
Build and run an iPlug2 iOS app in the iOS Simulator. An agent skill from iPlug2/iPlug2OOS.
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Related
Works with
Questions about Cryptokit
What does Cryptokit do?
Use Apple CryptoKit for Swift cryptographic primitives. An agent skill from dpearson2699/swift-ios-skills. Cryptokit is an agent skill from dpearson2699/swift-ios-skills. Use Apple CryptoKit for Swift cryptographic primitives.
When should I use Cryptokit?
Cryptokit fits situations like: hashing with SHA-2; generating HMACs; encrypting with AES-GCM; signing with P256/P384/P521/Curve25519.
How do I install Cryptokit in Claude Code?
Run `npx skills add dpearson2699/swift-ios-skills --skill cryptokit -a claude-code`. Or copy the skill folder (skills/cryptokit in dpearson2699/swift-ios-skills) into .claude/skills/cryptokit in your project. Claude Code loads it when a task matches its description.
How do I install Cryptokit in Codex?
Run `npx skills add dpearson2699/swift-ios-skills --skill cryptokit -a codex`. Or copy the skill folder (skills/cryptokit in dpearson2699/swift-ios-skills) into .agents/skills/cryptokit in your project. Codex loads it when a task matches its description.
Can I use Cryptokit in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add dpearson2699/swift-ios-skills --skill cryptokit -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/cryptokit, .gemini/skills/cryptokit, .github/skills/cryptokit and .opencode/skills/cryptokit in your project.
What does Cryptokit need to run?
SKILL.md names no scripts, command-line tools or credentials: Cryptokit is instructions for the agent only.
Does Cryptokit access the network?
SKILL.md names 1 domain. As links in the text: sosumi.ai. This is read from the text; nothing was executed.
Is Cryptokit safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Cryptokit use?
Cryptokit has a licence file (the repository's licence) that doesn't match a standard licence. Read it on GitHub before reusing the skill.
How many tokens does Cryptokit use?
About 3.6k tokens (SKILL.md is roughly 14k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 4.4k tokens, read only when the agent opens those files.
What are the alternatives to Cryptokit?
Skills that share tags, products or a category with Cryptokit: iOS Security (HoangNguyen0403/agent-skills-standard, 571 stars), Hig Project Context (raintree-technology/hig-doctor, 143 stars), Hig Components Content (raintree-technology/hig-doctor, 143 stars) and iOS Simulator Skill (n0an/VivaDicta, 131 stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Cryptokit?
dpearson2699 (a GitHub user) maintains it in dpearson2699/swift-ios-skills, which has 1,175 GitHub stars. The repository holds 86 skills in this directory. The repository was last updated on July 31, 2026.
Source: dpearson2699/swift-ios-skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.