Client certificate authentication

Robert Ionescu hightronicdesign at
Mon Mar 15 11:23:54 UTC 2021

I already found the callbacks for the verification process and I am still
trying to figure it out if it is possible to change them in a way that they
will print some certificate information to determine which certificate was
Robert Ionescu

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On Fri, Mar 12, 2021 at 3:39 PM Viktor Dukhovni <openssl-users at>

> On Fri, Mar 12, 2021 at 09:06:57AM +0100, Robert Ionescu wrote:
> > With "wrong" certificate I meant "invalid certificate".  So the idea
> > was in a bigger environment with a lot of certificates, to make the
> > invalid certificate debugging easier by getting more information from
> > openssl to identify the invalid certificate easier.
> Informal words like "wrong" or "invalid" still don't convey the actual
> meaning you have in mind, but in any case, the OpenSSL library provides
> callbacks that you can use to track the progress of and report errors
> in the certificate verification process.
>     SSL_CTX_set_verify(3)
>     SSL_set_verify(3)
> --
>     Viktor.
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