private static ITINKAead InitAead(string keyName)
{
TINKKeysetHandle handle = LoadOrCreateKey(keyName, CreateAeadKey);
ITINKAead aead = TINKAeadFactory.PrimitiveWithKeysetHandle(handle, out NSError error);
if (error != null)
{
throw new Exception("Failed to create Aead: " + error.LocalizedFailureReason);
}
return(aead);
}
public TinkAead(string alias)
{
// register
RegisterAead();
// load
string keyAliasName = $"{NSBundle.MainBundle.BundleIdentifier}_encrypted_user_defaults_{alias}_key";
string valueAliasName = $"{NSBundle.MainBundle.BundleIdentifier}_encrypted_user_defaults_{alias}_value";
_deterministicAead = InitDeterministicAead(keyAliasName);
_aead = InitAead(valueAliasName);
}
private void TestTink()
{
RegisterAead();
// gen key
NSError error;
var tpl = new TINKAeadKeyTemplate(TINKAeadKeyTemplates.Aes256Gcm, out error);
if (error != null)
{
Console.WriteLine("Error: " + error);
return;
}
var handle = new TINKKeysetHandle(tpl, out error);
if (error != null)
{
Console.WriteLine("Error: " + error);
return;
}
// store
var keysetName = "co.tnn.tink.demo_key";
if (!handle.WriteToKeychainWithName(keysetName, true, out error))
{
Console.WriteLine("Error: " + error);
return;
}
// load
TINKKeysetHandle handleStore = new TINKKeysetHandle(keysetName, out error);
if (error != null)
{
Console.WriteLine("Error: " + error);
return;
}
// AEAD
ITINKAead aead = TINKAeadFactory.PrimitiveWithKeysetHandle(handleStore, out error);
if (error != null)
{
Console.WriteLine("Error: " + error);
return;
}
// encrypt
NSData cipher = aead.Encrypt(NSData.FromString("hello world", NSStringEncoding.UTF8), NSData.FromString("k_value", NSStringEncoding.UTF8), out error);
if (error != null)
{
Console.WriteLine("Error: " + error);
return;
}
Console.WriteLine(cipher.GetBase64EncodedString(NSDataBase64EncodingOptions.None));
// decrypt
var plain = aead.Decrypt(cipher, NSData.FromString("k_value", NSStringEncoding.UTF8), out error);
if (error != null)
{
Console.WriteLine("Error: " + error);
return;
}
Console.WriteLine(plain.ToString(NSStringEncoding.UTF8));
}
