verify globus proxy certificate

HI, I need to prepare for some codes to verify globus proxy certificate in my teaching, but I meet some problems when I try to write the c codes with OpenSSL. The codes I implemented to verify globus proxy certificate is listed as follows, but it does not work well

How to verify globus proxy certificate

HI, I need to prepare for some codes to verify globus proxy certificate in my teaching, but I meet some problems when I try to write the c codes with OpenSSL. The codes I implemented to verify globus proxy certificate is listed as follows, but it does not work well