how to link a nickname with a keychain - swift

Question

Before, I was storing sensitive data(email, nickame, and password) in a json file. Now I am storing the email and the password into keychains ( kSecAttrAccount is the email)
But I have no ideea how can I store the nickname in the keychain. Or where can I store the nickname so it gets linked with a specific keychain.
import Foundation
import SwiftUI
func save(account: String, password: String) {
do {
try KeychainManager.save(
service: "loseamp",
account: account,
password: password.data(using: .utf8) ?? Data())
} catch {
print(error)
}
}
func getPassword(account: String, password: String) {
guard let data = KeychainManager.get(
service: "loseamp",
account: account
) else {
print("Failed to read password")
return
}
let password = String(decoding: data, as: UTF8.self)
print("read password here: \(password)")
}
class KeychainManager {
enum KeychainError: Error {
case duplicateEntry
case unknown(OSStatus)
}
static func save(service: String, account: String, password: Data) throws {
// service, account, password, class, data
let query: [String: AnyObject] = [
kSecAttrService as String: service as AnyObject,
kSecAttrAccount as String: account as AnyObject,
kSecValueData as String: password as AnyObject,
kSecClass as String: kSecClassGenericPassword
]
let status = SecItemAdd(query as CFDictionary, nil)
guard status != errSecDuplicateItem else {
throw KeychainError.duplicateEntry
}
guard status == errSecSuccess else {
throw KeychainError.unknown(status)
}
}
static func get(service: String, account: String) -> Data? {
// service, account, password, class, data
let query: [String: AnyObject] = [
kSecAttrService as String: service as AnyObject,
kSecAttrAccount as String: account as AnyObject,
kSecReturnData as String: kCFBooleanTrue,
kSecClass as String: kSecClassGenericPassword,
kSecMatchLimit as String: kSecMatchLimitOne
]
var result: AnyObject?
let status = SecItemCopyMatching(query as CFDictionary, &result)
print("Read status: \(status)")
return result as? Data
}
func update(service: String, account: String, password: Data) {
let query = [
kSecAttrService: service as AnyObject,
kSecClass as String: kSecClassGenericPassword,
kSecAttrAccount: account as AnyObject,
] as CFDictionary
let updatedData = [kSecValueData: password] as CFDictionary
SecItemUpdate(query, updatedData)
}
func delete(service: String, account: String) {
let query = [
kSecAttrService: service as AnyObject,
kSecClass: kSecClassGenericPassword,
kSecAttrAccount: account as AnyObject
] as CFDictionary
SecItemDelete(query)
}
func isEmailDuplicate(service: String, account: String) -> Bool {
let query: [String: AnyObject] = [
kSecAttrService as String: service as AnyObject,
kSecAttrAccount as String: account as AnyObject,
kSecClass as String: kSecClassGenericPassword
]
let status = SecItemAdd(query as CFDictionary, nil)
return status == errSecDuplicateItem
}
}