private static CryptographicAttributeObjectCollection CreateAttributeCollection(
X509Certificate2 certificate,
RSA privateKey,
Action <Asn1EncodableVector> addAttributes)
{
var content = new CmsProcessableByteArray(new byte[0]);
var attributes = new Asn1EncodableVector();
addAttributes(attributes);
var signedAttributes = new AttributeTable(attributes);
var unsignedAttributes = new AttributeTable(DerSet.Empty);
var generator = new CmsSignedDataGenerator();
var keyPair = DotNetUtilities.GetRsaKeyPair(privateKey);
generator.AddSigner(
keyPair.Private,
DotNetUtilities.FromX509Certificate(certificate),
Oids.Sha256,
signedAttributes,
unsignedAttributes);
var bcSignedCms = generator.Generate(content, encapsulate: true);
var signedCms = new SignedCms();
signedCms.Decode(bcSignedCms.GetEncoded());
return(signedCms.SignerInfos[0].SignedAttributes);
}