generatekey returns symmetrickey in swift

To generate a symmetric key using AES encryption in Swift, you can use the CryptoKit framework. Here's an example function that generates a symmetric key using AES-256 encryption:

main.swift
import CryptoKit

func generateSymmetricKey() -> SymmetricKey {
    let key = SymmetricKey(size: .bits256)
    return key
}
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This function creates a SymmetricKey instance with a key size of 256 bits, which is the AES-256 standard. You can use this key to encrypt and decrypt your data with symmetric encryption.