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Asked: 2026-05-11T10:13:01+00:00

I have two certificates that I saved to disk. One is a certificate with

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I have two certificates that I saved to disk. One is a certificate with private key that I exported as a .pfx file, the other one is a certificate that I saved including its certificate chain as a PKCS#7 file (‘certchain.p7b’).

In C# I can now load the .pfx file with

  var cert = new X509Certificate2(myPfxFileStream);

(myPfxFileStream is a FileStream opened to the .pfx File for reading), however trying the same thing with the PKCs#7 Certificate fails in a CryptoGraphicException ‘Der Indexwert ist ungültig’ which translates to ‘invalid index value’.

I assume I have to parse PKCS#7 differently (it contains a chain, not a single certificate!), but how?

(Oh, by the way: Currently I have no passwords on those certficiates)

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1 Answer

  1. You will want to use the SignedCms class in the System.Security.Cryptography.Pkcs namespace.

    This blog entry will show you how to use the class:

    link update 2021: https://learn.microsoft.com/en-us/archive/blogs/shawnfa/enveloped-pkcs-7-signatures

    original link: http://blogs.msdn.com/shawnfa/archive/2006/02/27/539990.aspx

    You basically will call the Decode method, passing the bytes representing the PKCS file.

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