(Swift 2) Create XML Signature using Java KeyStore (.jks)

Demonstrates how to create an XML digital signature using a certificate and private key from a Java KeyStore (.jks)

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

    // The SOAP XML to be signed in this example contains the following:

    // <?xml version="1.0" encoding="UTF-8" standalone="no" ?>
    // <SOAP-ENV:Envelope xmlns:SOAP-ENV="http://schemas.xmlsoap.org/soap/envelope/">
    //     <SOAP-ENV:Header>
    //         <wsse:Security xmlns:wsse="http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd" SOAP-ENV:mustUnderstand="1"></wsse:Security>
    //     </SOAP-ENV:Header>
    //     <SOAP-ENV:Body xmlns:SOAP-SEC="http://schemas.xmlsoap.org/soap/security/2000-12" SOAP-SEC:id="Body">
    //         <z:FooBar xmlns:z="http://example.com" />
    //     </SOAP-ENV:Body>
    // </SOAP-ENV:Envelope>
    // 

    // Build the XML to sign.
    // Use this online tool to generate the code from sample XML: 
    // Generate Code to Create XML

    let xml = CkoXml()
    xml.Tag = "SOAP-ENV:Envelope"
    xml.AddAttribute("xmlns:SOAP-ENV", value: "http://schemas.xmlsoap.org/soap/envelope/")
    xml.UpdateAttrAt("SOAP-ENV:Header|wsse:Security", autoCreate: true, attrName: "xmlns:wsse", attrValue: "http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd")
    xml.UpdateAttrAt("SOAP-ENV:Header|wsse:Security", autoCreate: true, attrName: "SOAP-ENV:mustUnderstand", attrValue: "1")
    xml.UpdateAttrAt("SOAP-ENV:Body", autoCreate: true, attrName: "xmlns:SOAP-SEC", attrValue: "http://schemas.xmlsoap.org/soap/security/2000-12")
    xml.UpdateAttrAt("SOAP-ENV:Body", autoCreate: true, attrName: "SOAP-SEC:id", attrValue: "Body")
    xml.UpdateAttrAt("SOAP-ENV:Body|z:FooBar", autoCreate: true, attrName: "xmlns:z", attrValue: "http://example.com")

    // Load a JavaKeyStore file containing the certificate + private key.
    let jks = CkoJavaKeyStore()
    var password: String? = "secret"
    var success: Bool = jks.LoadFile(password, path: "qa_data/jks/test_secret.jks")
    if success != true {
        print("\(jks.LastErrorText)")
        return
    }

    // Make sure we have a private key.
    if jks.NumPrivateKeys.intValue < 1 {
        print("No private key available.")
        return
    }

    // -------------------------------------------------------------------------
    // Get the certificate chain associated with the 1st (and probably only) private key in the JKS.
    var chain: CkoCertChain? = jks.GetCertChain(0)
    if jks.LastMethodSuccess != true {
        print("\(jks.LastErrorText)")
        return
    }

    var cert: CkoCert? = chain!.GetCert(0)
    if chain!.LastMethodSuccess != true {
        print("\(chain!.LastErrorText)")
        chain = nil
        return
    }

    chain = nil

    // Verify again that this cert has a private key.
    if cert!.HasPrivateKey() != true {
        print("Certificate has no associated private key.")
        cert = nil
        return
    }

    // Prepare for signing...
    // Use this online tool to generate the following code from an already-signed XML sample: 
    // Generate Code to Create an XML Signature
    let gen = CkoXmlDSigGen()

    // Indicate where the Signature will be inserted.
    gen.SigLocation = "SOAP-ENV:Envelope|SOAP-ENV:Header|wsse:Security"

    // Add a reference to the fragment of the XML to be signed.
    gen.AddSameDocRef("Body", digestMethod: "sha1", canonMethod: "EXCL_C14N", prefixList: "", refType: "")

    // (You can read about the SignedInfoPrefixList in the online reference documentation.  It's optional..)
    gen.SignedInfoPrefixList = "wsse SOAP-ENV"

    // Provide the private key for signing via the certificate, and indicate that
    // we want the base64 of the certificate embedded in the KeyInfo.
    gen.KeyInfoType = "X509Data"
    gen.X509Type = "Certificate"

    // Note: Because our certificate was loaded from a JKS which also contained the private key,
    // Chilkat automatically knows and has the private key associated with the certificate.
    // We set bUsePrivateKey to tell the SetX509Cert method to automatically use the private key
    // associated with the certificate for signing.
    var bUsePrivateKey: Bool = true
    success = gen.SetX509Cert(cert, usePrivateKey: bUsePrivateKey)
    if success != true {
        print("\(gen.LastErrorText)")
        cert = nil
        return
    }

    cert = nil

    // Everything's specified.  Now create and insert the Signature
    let sbXml = CkoStringBuilder()
    xml.GetXmlSb(sbXml)
    success = gen.CreateXmlDSigSb(sbXml)
    if success != true {
        print("\(gen.LastErrorText)")
        return
    }

    // Examine the XML with the digital signature inserted
    print("\(sbXml.GetAsString())")

}