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Hi. I'm working on a security related swift application, and I need som info from certificates stored in SecIdentities. Although I can access to SecCertificate to extract some info (serialnumber, common name, subject name) y can't find any example of function (or OSX API documentation) for other data extraction, like validity date (from/until), DER encoded public key, certificate usage policies, etc.I'm using Xcode 8.2.1 (Swift 3.0.2).Thank you in advance.