/// <summary>
/// Generates the truncated SHA521 hash of the <paramref name="message"/>.
/// </summary>
/// <param name="message"></param>
public BigInteger HashMessage(string message)
{
byte[] messageBytes = Encoding.Default.GetBytes(message);
byte[] messageHash;
using (SHA512Managed sha512M = new SHA512Managed())
{
messageHash = sha512M.ComputeHash(messageBytes);
}
BigInteger e = new BigInteger(messageHash);
BigInteger z = e >> (e.BitLenght() - Curve.n.BitLenght());
if (!(z.BitLenght() <= Curve.n.BitLenght()))
{
throw new Exception("!(z.BitLenght() <= Curve.n.BitLenght())");
}
return(z);
}