(Swift 3,4,5...) Convert Java KeyStore to PEM

Loads a Java keystore file and saves the trusted certificate entries to a PEM file.

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

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

    let jks = CkoJavaKeyStore()!

    var jksPassword: String? = "myJksPassword"

    // Load the Java keystore from a file.  The JKS file password is used
    // to verify the keyed digest that is found at the very end of the keystore.
    // It verifies that the keystore has not been modified.
    var success: Bool = jks.loadFile(jksPassword, path: "/someDir/keyStore.jks")
    if success != true {
        print("\(jks.lastErrorText!)")
        return
    }

    // Open/create the output PEM file. 
    // This example uses Chilkat's file access class for writing the output file.
    // You may replace the file I/O lines of code with whatever is most convenient for you.
    let fac = CkoFileAccess()!
    success = fac.open(forWrite: "/pemFiles/caCerts.pem")
    if success != true {
        print("\(fac.lastErrorText!)")
        return
    }

    var numCerts: Int = jks.numTrustedCerts.intValue
    var i: Int

    var cert: CkoCert?
    var pem: String?

    // Iterate over the trusted certs, get the PEM for each,
    // and append it to the output file.
    i = 0
    while i < numCerts {
        cert = jks.getTrustedCert(i)

        // Get the certificate in PEM format.  
        pem = cert!.exportPem()

        // Append the PEM string to the open file.
        // The PEM contains only us-ascii chars..
        success = fac.appendAnsi(pem)
        if success != true {
            print("\(fac.lastErrorText!)")
            cert = nil
            return
        }

        cert = nil
        i = i + 1
    }

    // Close the output file.
    fac.fileClose()

    print("Trusted certificates saved to PEM.")

}