void GetIVandKeys(int id, EncryptedFieldIds fieldId, out byte[] iv, out byte[] aesKey, out byte[] hmacKey)
{
BinaryProcedures.CreateBinaryWriter(out var ms, out var w);
w.Write(id);
w.Write((byte)fieldId);
var sha256result = _cryptoLibrary.GetHashSHA256(ms.ToArray());
var preKey = _keyProvider.HsmOperation(sha256result);
_cryptoLibrary.DeriveKeysRFC5869_32bytes(preKey, sha256result, out aesKey, out hmacKey);
iv = sha256result.Take(16).ToArray();
}
