public static Byte[] GetValueAsBytes(Int64 value)
{
String valueAsString = value.ToString("0");
Org.BouncyCastle.Math.BigInteger v = new Org.BouncyCastle.Math.BigInteger(valueAsString);
Byte[] x = new Byte[8];
Byte[] y = v.ToByteArray();
Array.Reverse(y);
Array.Copy(y, x, y.Length);
string forDebug = v.ToHexNumberString();
return(x);
}