I'm trying to create a symmetricKey from a custom string.
My code worked well when I used SymmetricKey(size:), but I want to create symmetricKey from a custom string, so I used SymmetricKey(data:). I don't know what's wrong with my code.
func encryptAccessToken(with accessToken: String) {
guard #available(iOS 13.0, *) else { return }
guard let keyData = "myStringKey".data(using: .utf8), let data = accessToken.data(using: .utf8) else { return }
let symmetricKey = SymmetricKey(data: keyData)
do {
let encryptedData = try AES.GCM.seal(data, using: symmetricKey).combined
UserDefaults.standard.set(encryptedData, forKey: secretKey)
} catch {
print("\(error.localizedDescription)")
}
}
I answered it myself, here's the answer for someone may need this.
func encryptAccessToken(with accessToken: String) {
guard #available(iOS 13.0, *) else { return }
guard let data = accessToken.data(using: .utf8) else { return }
let myString = "myString"
let keyData = SHA256.hash(data: myString.data(using: .utf8)!)
let symmetricKey = SymmetricKey(data: keyData)
do {
let encryptedData = try AES.GCM.seal(data, using: symmetricKey).combined
UserDefaults.standard.set(encryptedData, forKey: secretKey)
} catch {
print("\(error.localizedDescription)")
}
}