/// <summary><inheritDoc/></summary>
/// <exception cref="Org.BouncyCastle.Security.GeneralSecurityException"/>
public virtual byte[] Sign(byte[] message)
{
String algorithm = hashAlgorithm + "with" + encryptionAlgorithm;
ISigner sig = SignUtils.GetSignatureHelper(algorithm);
sig.InitSign(pk);
sig.Update(message);
return(sig.GenerateSignature());
}