Perform cryptographic operations in Swift using Apple CryptoKit.
npx skills add https://github.com/DFly7/iOS-FastAPI-Supabase-AI --skill cryptokit
Please help me install this Agent Skill. Skill: cryptokit Source: https://github.com/DFly7/iOS-FastAPI-Supabase-AI/tree/main/.agents/skills/cryptokit Command: npx skills add https://github.com/DFly7/iOS-FastAPI-Supabase-AI --skill cryptokit
Helps developers implement correct, modern cryptographic operations in Swift by providing clear patterns and safe defaults for hashing, HMAC, authenticated encryption, signing, key agreement, and Secure Enclave usage so apps avoid common crypto pitfalls.
Use the cryptokit skill to generate or import keys, derive a symmetric key with HKDF, encrypt data with AES-GCM or ChaChaPoly, and sign or verify a message.
High-intent search queries and answers about installing and using this skill.
AES-GCM encryption in Swift using CryptoKit involves generating a symmetric key, creating a nonce, and sealing data into an AES.GCM.SealedBox. You handle associated data (AAD) during encryption and use the sealed box components for safe decryption.
Migrating CommonCrypto hashing to CryptoKit SHA256 involves replacing C-style function calls with Swift's HashFunction protocol, using SHA256.hash(data:) for direct digest computation. CryptoKit provides safe defaults and constant-time verification for HMAC operations.
Secure Enclave key storage in iOS apps works by generating ECDSA or Ed25519 keys with the Secure Enclave flag, keeping private keys hardware-backed and non-extractable. You create, protect, and restore these keys while using Keychain for metadata storage.
Yes, you can use CryptoKit for ECDH key agreement and HKDF derivation by generating elliptic curve keys, performing key agreement with the peer's public key, and deriving symmetric keys using HKDF with proper salt and info parameters.
Signing and verifying messages with Ed25519 in Swift involves generating an Ed25519 private key, creating a signature for your data, and using the corresponding public key for constant-time verification to ensure message authenticity.
ChaChaPoly authenticated encryption in Swift requires careful nonce management to prevent key compromise, and sealed box components must be stored together for successful decryption. Proper key handling and storage are essential limitations to consider.
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