(Swift 2) How to Parse a X.509 Certificate and Extract its Public Key

Demonstrates how to load an X.509 certificate and extract the public key. Chilkat supports many certificate encodings:

• DER (binary) encoded certificates (.crt/.cer)
• PEM (BASE64) encoded certificates (.pem)
• Load Certificates Directly from Windows Certificate Stores
• PFX/PKCS12 (.pfx/.p12)
• Java KeyStore (.jks)
• Cryptographic Message Syntax Standard - PKCS #7 Certificates (.P7B)

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

func chilkatTest() {
    let cert = CkoCert()

    // Load a DER (binary) encoded certificate.
    // To load from a .pem or .p7b, or any other file format that contains
    // just one certificate, call LoadFromFile in exactly the same way.
    // The LoadFromFile method automatically detects the format and loads the certificate.
    var success: Bool = cert.LoadFromFile("qa_data/certs/testCert.cer")
    if success == false {
        print("\(cert.LastErrorText)")
        return
    }

    // Get the public key:
    var pubKey: CkoPublicKey? = cert.ExportPublicKey()
    if cert.LastMethodSuccess != true {
        print("\(cert.LastErrorText)")
        return
    }

    // Examine the key type.
    // A PublicKey object can contain an RSA, ECC, or DSA public key.
    // The KeyType property will contain "rsa", "ecc", or "dsa".
    print("key type = \(pubKey!.KeyType)")

    pubKey = nil

}