Binary Data Search and Compare

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I am writing a code for certificate search and compare then the result will get user DN value.

It is a user certificate which generates from external CA server. I can not use standard way to verify certificate validation because the networking is not allow to contact external CA server. Then I need to write a code to compare certificate. The problem is certificate is a binary data, what class I should call or what is the correct way to search and compare binary data.

Thank You Very Much!