CMS签名X509证书与Bouncy城堡

我需要把这个。net代码翻译成BouncyCastle代码，因为我需要在mono中使用

X509Certificate2 certFirmante = LoadCertFromFile("sign.p12");
ContentInfo infoContenido = new ContentInfo(argBytesMsg);
SignedCms cmsFirmado = new SignedCms(infoContenido);
CmsSigner cmsFirmante = new CmsSigner(argCertFirmante);
cmsFirmante.IncludeOption = X509IncludeOption.EndCertOnly;
cmsFirmado.ComputeSignature(cmsFirmante, true);
return cmsFirmado.Encode();

我尝试用这段代码，但签名的数据是不一样的

CmsSignedDataGenerator gen = new CmsSignedDataGenerator();
CmsEnvelopedDataStreamGenerator dataGenerator = new CmsEnvelopedDataStreamGenerator();

dataGenerator.AddKeyTransRecipient(cert);
// Make the output stream
MemoryStream outStream = new MemoryStream();
// Sign the stream
Stream cryptoStream = dataGenerator.Open(outStream, CmsEnvelopedGenerator.Aes128Cbc);
BinaryWriter binWriter = new BinaryWriter(cryptoStream);
binWriter.Write(datos);
byte[] contenido = new byte[outStream.Length];
outStream.Read(contenido, 0, Convert.ToInt32(outStream.Length));
return contenido;

byte[] Sign (byte[] argBytesMsg)
{
    var signedData = new CmsSignedDataStreamGenerator ();
    var x509certificate2 = LoadCertFromFile ("sign.p12");
    var cert = DotNetUtilities.FromX509Certificate (x509certificate2);
    var key = DotNetUtilities.GetKeyPair (x509certificate2.PrivateKey);
    signedData.AddSigner (key.PrivateKey, cert, X509ObjectIdentifiers.IdSha1.Id, null, null);
    signedData.AddCertificate (cert);
    using (var memory = new MemoryStream ()) {
        using (var stream = signedData.Open (memory, true))
            stream.Write (argBytesMsg, 0, argBytesMsg.Length);
        return memory.ToArray ();
    }
}