private void GenerateStoreKey(bool withDate)
{
if (_keyStore.ContainsAlias(KeyAlias))
{
return;
}
ClearSettings();
var end = Calendar.Instance;
end.Add(CalendarField.Year, 99);
if (_oldAndroid)
{
var subject = new X500Principal($"CN={KeyAlias}");
var builder = new KeyPairGeneratorSpec.Builder(Application.Context)
.SetAlias(KeyAlias)
.SetSubject(subject)
.SetSerialNumber(BigInteger.Ten);
if (withDate)
{
builder.SetStartDate(new Date(0)).SetEndDate(end.Time);
}
var spec = builder.Build();
var gen = KeyPairGenerator.GetInstance(KeyProperties.KeyAlgorithmRsa, AndroidKeyStore);
gen.Initialize(spec);
gen.GenerateKeyPair();
}
else
{
var builder = new KeyGenParameterSpec.Builder(KeyAlias, KeyStorePurpose.Decrypt | KeyStorePurpose.Encrypt)
.SetBlockModes(KeyProperties.BlockModeGcm)
.SetEncryptionPaddings(KeyProperties.EncryptionPaddingNone);
if (withDate)
{
builder.SetKeyValidityStart(new Date(0)).SetKeyValidityEnd(end.Time);
}
var spec = builder.Build();
var gen = KeyGenerator.GetInstance(KeyProperties.KeyAlgorithmAes, AndroidKeyStore);
gen.Init(spec);
gen.GenerateKey();
}
}
private void CreateKey_Credentials()
{
var generator = KeyPairGenerator.GetInstance("RSA", AndroidKeyStore);
if (Build.VERSION.SdkInt < BuildVersionCodes.M)
{
Java.Util.Calendar calendar = Java.Util.Calendar.Instance;
calendar.Add(Java.Util.CalendarField.Year, 20);
Date startDate = Java.Util.Calendar.Instance.Time;
Date endDate = calendar.Time;
#pragma warning disable 0618
var builder = new KeyPairGeneratorSpec.Builder(_context);
#pragma warning restore 0618
builder.SetAlias(KEYALIAS_CREDENTIALS);
builder.SetSerialNumber(Java.Math.BigInteger.One);
builder.SetSubject(new Javax.Security.Auth.X500.X500Principal("CN=${alias} CA Certificate"));
builder.SetStartDate(startDate);
builder.SetEndDate(endDate);
generator.Initialize(builder.Build());
}
else
{
var builder = new KeyGenParameterSpec.Builder(KEYALIAS_CREDENTIALS, KeyStorePurpose.Encrypt | KeyStorePurpose.Decrypt);
builder.SetBlockModes(KeyProperties.BlockModeEcb);
builder.SetEncryptionPaddings(KeyProperties.EncryptionPaddingRsaPkcs1);
generator.Initialize(builder.Build());
}
generator.GenerateKeyPair();
}