(Swift 3,4,5...) Examine SSL/TLS Server Certificate

See more Socket/SSL/TLS Examples

Demonstrates how an application can examine and check a server's SSL/TLS 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 socket = CkoSocket()!

    // Connect to a server.
    var useTls: Bool = true
    var maxWaitMs: Int = 2000
    var success: Bool = socket.connect("www.intel.com", port: 443, ssl: useTls, maxWaitMs: maxWaitMs)
    if success == false {
        print("\(socket.lastErrorText!)")
        return
    }

    // If we get here, the TLS connection ws made..
    // In any SSL/TLS handshake, the server sends its certificate in a TLS handshake message.
    // Chilkat will keep it cached within the object that made the connection.
    // Get the server's cert and examine a few things.
    var cert: CkoCert? = socket.getSslServerCert()
    if socket.lastMethodSuccess == false {
        // This is unexpected..
        print("\(socket.lastErrorText!)")
        return
    }

    print("Distinguished Name: \(cert!.subjectDN!)")
    print("Common Name: \(cert!.subjectCN!)")
    print("Issuer Distinguished Name: \(cert!.issuerDN!)")
    print("Issuer Common Name: \(cert!.issuerCN!)")

    print("Expired: \(cert!.expired)")
    print("Revoked: \(cert!.revoked)")
    print("Signature Verified: \(cert!.signatureVerified)")
    print("Trusted Root: \(cert!.trustedRoot)")

    // Sample output:

    // Distinguished Name: C=US, ST=California, O=Intel Corporation, CN=*.intel.com
    // Common Name: *.intel.com
    // Issuer Distinguished Name: C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Organization Validation Secure Server CA
    // Issuer Common Name: Sectigo RSA Organization Validation Secure Server CA
    // Expired: False
    // Revoked: False
    // Signature Verified: True
    // Trusted Root: True

    cert = nil

}