(Swift) Get the Server Certificate, Certificate Chain, and Root CA Certificate

Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate.

Chilkat Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let http = CkoHttp()!

    // We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
    var sslCert: CkoCert? = http.getServerSslCert("nationalgeographic.com", port: 443)
    if http.lastMethodSuccess == false {
        print("\(http.lastErrorText!)")
        return
    }

    // Note: Prior to v9.5.0.50, this method would fail if the certificate chain could not 
    // be completed to the root.  Starting in v9.5.0.50, the incomplete certificate chain 
    // will be returned.  The certificate chain's ReachesRoot property can be examined to 
    // see if the chain was completed to the root.
    var certChain: CkoCertChain? = sslCert!.getChain()
    if sslCert!.lastMethodSuccess == false {
        print("\(sslCert!.lastErrorText!)")
        sslCert = nil
        return
    }

    var i: Int = 0
    var numCerts: Int = certChain!.numCerts.intValue
    while i < numCerts {
        var cert: CkoCert? = certChain!.getCert(i)
        print("SubjectDN \(i): \(cert!.subjectDN!)")
        print("IssuerDN \(i): \(cert!.issuerDN!)")
        cert = nil
        i = i + 1
    }

    // If the certificate chain reaches the root CA cert, then the last cert in the chain
    // is the root CA cert.
    if certChain!.reachesRoot == true {
        var caCert: CkoCert? = certChain!.getCert(numCerts - 1)
        print("CA Root Cert: \(caCert!.subjectDN!)")
        caCert = nil
    }

    sslCert = nil
    certChain = nil

}