How to perform 'Async RSA Keygen' in Swift.
// Task: Async RSA Keygen
// Language: Swift
func asyncRsaKeygen() {
// Implementation for Async RSA Keygen
var result = ...; // Initialize variable
// TODO: Implement core logic here
// Step 1: Prepare data
// Step 2: Process Async RSA Keygen
print("Done");
}