private key not available for client_cert_cb

Michael Wojcik Michael.Wojcik at
Tue Jan 12 15:30:20 UTC 2021

> From: openssl-users <openssl-users-bounces at> On Behalf Of George
> Sent: Tuesday, 12 January, 2021 00:18

> I'm running this in Windows 10 and when I load the smart card middleware
> PKCS11 DLL, I see the exception:
> Exception thrown at 0x773046D2 in GENCom.exe: Microsoft C++ exception:
> unsigned long at memory location 0x07FCFA00.

OK. If I were debugging libp11, it would be useful to know what the exception actually was, but as it is all I can say is that it seems to be a libp11 problem. As you noted further below:

> It looks like someone else using a smart card has also encountered similar
> problems in Windows but there is no real answer as to why they are occurring:
> exceptions-but

You'll probably have to just swallow the exceptions and retry until it works or your code decides to give up and return an error. Maybe one of the libp11 maintainers or someone else using the library will dig into it at some point.

Michael Wojcik

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