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Simplest Digital Signing

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            X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser);
            store.Open(OpenFlags.ReadOnly | OpenFlags.OpenExistingOnly);
            X509Certificate2Collection certs =
                X509Certificate2UI.SelectFromCollection(store.Certificates,
                    "Certificates", "Please select certificate to use", X509SelectionFlag.SingleSelection);

            CmsSigner cms = new CmsSigner(certs[0]);
            SignedCms sig = new SignedCms(new ContentInfo(new byte[10]));

            sig.ComputeSignature(cms, false); 
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