public virtual Option <string> EncryptData(KeyMaterial receivedKeyMaterial,
AsymmetricCipherKeyPair senderKeyPair,
string content, string randomKeySender)
{
var receiverKeyBytes = EncryptorHelper.GetByteFromBase64(receivedKeyMaterial.DhPublicKey.KeyValue);
var sharedKey = EncryptorHelper.GetBase64FromByte(EncryptorHelper.GetDeriveKey((byte[])receiverKeyBytes,
senderKeyPair,
receivedKeyMaterial.Curve,
receivedKeyMaterial.CryptoAlg));
var encryptedContent = Encrypt(sharedKey, content, randomKeySender,
receivedKeyMaterial.Nonce);
return(encryptedContent == string.Empty ? Option.None <string>() : Option.Some(encryptedContent));
}
private static string Encrypt(string sharedKey, string dataToEncrypt,
string randomKeySender, string randomKeyReceiver)
{
var xorOfRandoms = EncryptorHelper.XorOfRandom(randomKeySender, randomKeyReceiver).ToArray();
var salt = xorOfRandoms.Take(20);
var iv = xorOfRandoms.TakeLast(12);
var aesKey = EncryptorHelper.GenerateAesKey(sharedKey, salt);
try
{
return(EncryptDataUseAesGcm(dataToEncrypt, aesKey.ToArray(), iv.ToArray()));
}
catch (Exception e)
{
Log.Error("Error Occured while encryption {exception}: ", e);
return("");
}
}
