Michael,

using the code: 
PdfPKCS7 sgn = new PdfPKCS7(null, chain, null, "SHA256", false); 
                DateTime cal = DateTime.Now; 
                byte[] ocsp = null; 
                byte[] sh = sgn.GetAuthenticatedAttributeBytes(signedHash,
cal, ocsp); 
                sgn.Update(sh, 0, sh.Length); 

with ocsp null, i have a "NullReference Exception" to: sgn.Update(sh, 0,
sh.Length); 

Any suggestion?

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