Another quick question, I'm setting up a server ssl handshake on a device on 
which the certificate verification will sometimes fail not because the 
certificate is bad but because the time is not set properly on the device.

I'm doing an ssl verify callback that is almost identical to one of the 
examples in 
https://www.openssl.org/docs/manmaster/crypto/X509_STORE_CTX_set_verify_cb.html
I.e.

 int verify_callback(int ok, X509_STORE_CTX *ctx)
        {
        int err = X509_STORE_CTX_get_error(ctx);
        X509 *err_cert = X509_STORE_CTX_get_current_cert(ctx);
        if (err == X509_V_ERR_CERT_HAS_EXPIRED)
                {
                if (check_is_acceptable_expired_cert(err_cert)
                        return 1;
                }
        return ok;
        }

I have some other slight differences but basically what I need is an 
implementation for the (fictitious) 
"check_is_acceptable_expired_cert(err_cert)" function call.

Is there any quick way of doing this that doesn't involve completely 
reconstructing the steps for verification (and leaving one out)?  I can do that 
if I need to but this is only one part of a larger endeavour that will take 
much more time - any pointers? thanks .... N











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