Question 1

How do I generate and store an RSA key pair with SwCrypt?

Accepted Answer

Use CC.RSA.generateKeyPair() to create keys, then convert to PEM with SwKeyConvert and store securely via SwKeyStore.upsertKey() with Keychain options, as shown in the README examples for key management and storage.

Question 2

SwCrypt vs Apple's CryptoKit: which one should I use?

Accepted Answer

SwCrypt is better for compatibility with older iOS versions and OpenSSL systems, while CryptoKit is Apple's modern, Swift-only framework with better performance on newer OSes. Choose SwCrypt if you need legacy support or specific algorithms like RSA-PSS.

Question 3

Can I use SwCrypt for server-side Swift on Linux?

Accepted Answer

No, SwCrypt relies on Apple's CommonCrypto framework, which is only available on iOS and macOS. For Linux, you'd need alternative libraries like OpenSSL wrappers or SwiftCrypto.

Question 4

Is SwCrypt compatible with keys generated by OpenSSL?

Accepted Answer

Yes, SwCrypt supports reading and writing keys in PEM format with OpenSSL compatibility, including encrypted private keys, as demonstrated in the SwKeyConvert examples for conversion and decryption.

Question 5

What happens if a cryptographic function isn't available on my device?

Accepted Answer

You must check availability using functions like CC.available() or specific checks (e.g., CC.RSA.available()) before calling the function, as per the README's warning, to avoid crashes on unsupported systems.

Question 6

How to perform authenticated encryption with AES-GCM in SwCrypt?

Accepted Answer

Use CC.cryptAuth() with blockMode .gcm, specifying data, additional authenticated data (aData), key, IV, and tagLength, as shown in the README snippet for symmetric authenticating ciphers.

SwCrypt

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