(Swift) Export Digital Certificate's Public Key

The ExportPublicKey method can be called to get a certificate's public key. It can then be saved to any of a number of formats: (1) OpenSSL DER, (2) OpenSSL PEM, (3) RSA DER, (4) XML.

Note: This example requires Chilkat v11.0.0 or greater.

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

func chilkatTest() {
    var success: Bool = false

    let cert = CkoCert()!

    // LoadFromFile will load virtually any certificate format file.
    // It will auto-recognize the format and load appropiately.
    success = cert.load(fromFile: "/Users/chilkat/testData/cer/chilkat.cer")
    if success == false {
        print("\(cert.lastErrorText!)")
        return
    }

    // Get the public key:
    let pubkey = CkoPublicKey()!
    cert.get(pubkey)

    // Save to various formats:
    success = pubkey.saveDerFile(false, path: "/Users/chilkat/testData/pubkeys/chilkat_pkcs8.der")
    if success != true {
        print("\(pubkey.lastErrorText!)")
        return
    }

    success = pubkey.savePemFile(false, path: "/Users/chilkat/testData/pubkeys/chilkat.pem")
    if success != true {
        print("\(pubkey.lastErrorText!)")
        return
    }

    success = pubkey.saveDerFile(true, path: "/Users/chilkat/testData/pubkeys/chilkat_pkcs1.der")
    if success != true {
        print("\(pubkey.lastErrorText!)")
        return
    }

    success = pubkey.saveXmlFile("/Users/chilkat/testData/pubkeys/chilkat.xml")
    if success != true {
        print("\(pubkey.lastErrorText!)")
        return
    }

    print("Public key exported to all file formats.")

}