public static byte[] EncryptData(byte[] data, byte[] key)
{
long cipherTextLength = data.Length + 16;
byte[] cipherText = new byte[cipherTextLength];
byte[] nonce = StreamEncryption.GetRandomBytes(X_NONC_ESIZE);
int result = NativeLibsodium.crypto_aead_xchacha20poly1305_ietf_encrypt(
cipherText,
out cipherTextLength,
data,
data.Length,
null, 0, null,
nonce,
key);
if (result != 0)
{
throw new EncryptionError();
}
byte[] cipherTextWithNonce = ConcatNonceAndCipherText(nonce, cipherText);
return(cipherTextWithNonce);
}