private static Stream AttachDigestsToOutputStream(ICollection digests, Stream s)
{
Stream stream = s;
foreach (IDigest dig in digests)
{
stream = CmsSignedDataStreamGenerator.GetSafeTeeOutputStream(stream, new DigOutputStream(dig));
}
return(stream);
}
public Stream Open(Stream outStream, string signedContentType, bool encapsulate, Stream dataOutputStream)
{
if (outStream == null)
{
throw new ArgumentNullException("outStream");
}
if (!outStream.CanWrite)
{
throw new ArgumentException("Expected writeable stream", "outStream");
}
if (dataOutputStream != null && !dataOutputStream.CanWrite)
{
throw new ArgumentException("Expected writeable stream", "dataOutputStream");
}
this._messageDigestsLocked = true;
BerSequenceGenerator berSequenceGenerator = new BerSequenceGenerator(outStream);
berSequenceGenerator.AddObject(CmsObjectIdentifiers.SignedData);
BerSequenceGenerator berSequenceGenerator2 = new BerSequenceGenerator(berSequenceGenerator.GetRawOutputStream(), 0, true);
DerObjectIdentifier derObjectIdentifier = (signedContentType == null) ? null : new DerObjectIdentifier(signedContentType);
berSequenceGenerator2.AddObject(this.CalculateVersion(derObjectIdentifier));
Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(new Asn1Encodable[0]);
foreach (string identifier in this._messageDigestOids)
{
asn1EncodableVector.Add(new Asn1Encodable[]
{
new AlgorithmIdentifier(new DerObjectIdentifier(identifier), DerNull.Instance)
});
}
byte[] encoded = new DerSet(asn1EncodableVector).GetEncoded();
berSequenceGenerator2.GetRawOutputStream().Write(encoded, 0, encoded.Length);
BerSequenceGenerator berSequenceGenerator3 = new BerSequenceGenerator(berSequenceGenerator2.GetRawOutputStream());
berSequenceGenerator3.AddObject(derObjectIdentifier);
Stream s = encapsulate ? CmsUtilities.CreateBerOctetOutputStream(berSequenceGenerator3.GetRawOutputStream(), 0, true, this._bufferSize) : null;
Stream safeTeeOutputStream = CmsSignedDataStreamGenerator.GetSafeTeeOutputStream(dataOutputStream, s);
Stream outStream2 = CmsSignedDataStreamGenerator.AttachDigestsToOutputStream(this._messageDigests.Values, safeTeeOutputStream);
return(new CmsSignedDataStreamGenerator.CmsSignedDataOutputStream(this, outStream2, signedContentType, berSequenceGenerator, berSequenceGenerator2, berSequenceGenerator3));
}
