private PgpSignatureGenerator InitSignature(Stream outputStream)
{
if (PrivateKey == null)
{
return(null);
}
var signatureGenerator = new PgpSignatureGenerator(PrivateKey.GetPublicKey().Algorithm, HashAlgorithm);
signatureGenerator.InitSign(PgpSignature.BinaryDocument, PrivateKey.GetSecretKey().ExtractPrivateKey(_password.ToCharArray()));
var userId = PrivateKey.GetPublicKey().GetUserIds().OfType <string>().FirstOrDefault();
var subpacketGenerator = new PgpSignatureSubpacketGenerator();
subpacketGenerator.SetSignerUserId(false, userId);
signatureGenerator.SetHashedSubpackets(subpacketGenerator.Generate());
signatureGenerator.GenerateOnePassVersion(false).Encode(outputStream);
return(signatureGenerator);
}