Swift Requires Chilkat v11.0.0+

SII Chile - FRMA Signature Computation and Add to XML

See more XML Digital Signatures Examples

Compute the FRMA signature of a <DA> element enclosed inside a <CAF> element of the XML to be signed. Swift

func chilkatTest() {
    var success: Bool = false

    //  This example assumes the Chilkat API to have been previously unlocked.
    //  See Global Unlock Sample for sample code.

    //  Also see:  Compute the FRMT Signature and Add to XML

    let xml = CkoXml()!

    //  Load the unsigned XML that contains the following:

    //  <DTE version="1.0">
    //    <Documento ID="F60T33">
    //          <TED version="1.0">
    //              <DD>
    //  		...
    //                  <CAF version="1.0">
    //                      <DA>
    //  			...
    //                      </DA>
    //  			... The FRMA will be added here ...
    //                  </CAF>
    //                  ...
    //              </DD>
    //              ... The FRMT will be added here in another example ...
    //          </TED>
    //    </Documento>
    //  </DTE>

    success = xml.loadFile(path: "qa_data/xml_dsig/sii_cl/test_0.xml")
    if success == false {
        print("Failed to load initial XML file.")
        return
    }

    //  Get a reference to the "DA" element
    var daXml: CkoXml? = xml.findChild(tagPath: "Documento|TED|DD|CAF|DA")
    if xml.lastMethodSuccess == false {
        print("Failed to find DA element")
        return
    }

    //   We need to get the "flattened" DA XML where:
    //     - No whitespace between elements.
    //     - The 5 pre-defined entities are converted.
    //     - The text is encoded in the ISO-8859-1 character set (Latin-1), 
    let sbFlattened = CkoStringBuilder()!
    daXml.emitCompact = true
    daXml.emitXmlDecl = false
    daXml!.getSb(sb: sbFlattened)

    //  Compute the SHA-1 message digest of the iso-8859-1 byte representation, 
    //  and sign it with our RSA private key, getting the result in base64 format.

    let privKey = CkoPrivateKey()!
    success = privKey.loadAnyFormatFile(path: "qa_data/rsa/rsaPrivKey_pkcs8.pem", password: "")
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    let rsa = CkoRsa()!
    rsa.usePrivateKey(privKey: privKey)

    rsa.encodingMode = "base64"
    rsa.charset = "iso-8859-1"
    var sig: String? = rsa.signStringENC(str: sbFlattened.getAsString(), hashAlg: "sha1")

    //  Add the FRMA signature element to the XML.
    xml.updateChildContent(tagPath: "Documento|TED|DD|CAF|FRMA", value: sig)
    xml.updateAttrAt(tagPath: "Documento|TED|DD|CAF|FRMA", autoCreate: true, attrName: "algoritmo", attrValue: "SHA1withRSA")

    daXml = nil

    //  See what we have:
    xml.emitCompact = false
    xml.emitXmlDecl = true
    print("\(xml.getXml()!)")

    xml.save(path: "qa_data/xml_dsig/sii_cl/test_1.xml")

}