How do I use CryptoKit for hashing and encryption?

    import CryptoKit

    // Example of hashing using SHA256
    let inputData = "Hello, World!"
    let inputDataBytes = Data(inputData.utf8)
    let hashed = SHA256.hash(data: inputDataBytes)

    // Converting the hashed data to its hexadecimal representation
    let hashedString = hashed.map { String(format: "%02hhx", $0) }.joined()
    print("SHA256 Hash: \(hashedString)")

    // Example of encryption using Symmetric Key
    let key = SymmetricKey(size: .bits256)
    let plaintext = "This is a secret message."
    let plaintextData = Data(plaintext.utf8)

    // Encrypting the plaintext
    let sealedBox = try AES.GCM.seal(plaintextData, using: key)

    // Decrypting the ciphertext
    let decryptedData = try AES.GCM.open(sealedBox, using: key)
    let decryptedMessage = String(data: decryptedData, encoding: .utf8)

    print("Decrypted message: \(decryptedMessage ?? "Failed to decrypt")")