(Lianja) SII Chile - FRMT Signature Computation and Add to XML

Compute the FRMT signature and add to the XML. This is the RSA signature of the SHA-1 digest of the "flattened" DD element.

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

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

loXml = createobject("CkXml")

// 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>
//                     <FRMA algoritmo="SHA1withRSA">...</FRMA>
//                 </CAF>
//                 ...
//             </DD>
//             ... The FRMT will be added here in another example ...
//         </TED>
//   </Documento>
// </DTE>

llSuccess = loXml.LoadXmlFile("qa_data/xml_dsig/sii_cl/test_1.xml")
if (llSuccess = .F.) then
    ? "Failed to load initial XML file."
    release loXml
    return
endif

// Get a reference to the "DD" element
loDdXml = loXml.FindChild("Documento|TED|DD")
if (loXml.LastMethodSuccess = .F.) then
    ? "Failed to find DD element"
    release loXml
    return
endif

//  We need to get the "flattened" DD 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), 
loSbFlattened = createobject("CkStringBuilder")
loDdXml.EmitCompact = .T.
loDdXml.EmitXmlDecl = .F.
loDdXml.GetXmlSb(loSbFlattened)

// 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.

loPrivKey = createobject("CkPrivateKey")
llSuccess = loPrivKey.LoadAnyFormatFile("qa_data/rsa/rsaPrivKey_pkcs8.pem","")
if (llSuccess = .F.) then
    ? loPrivKey.LastErrorText
    release loXml
    release loSbFlattened
    release loPrivKey
    return
endif

loRsa = createobject("CkRsa")
loRsa.ImportPrivateKeyObj(loPrivKey)

loRsa.EncodingMode = "base64"
loRsa.Charset = "iso-8859-1"
lcSig = loRsa.SignStringENC(loSbFlattened.GetAsString(),"sha1")

// Add the FRMT signature element to the XML.
loXml.UpdateChildContent("Documento|TED|FRMT",lcSig)
loXml.UpdateAttrAt("Documento|TED|FRMT",.T.,"algoritmo","SHA1withRSA")

release loDdXml

// See what we have:
loXml.EmitCompact = .F.
loXml.EmitXmlDecl = .T.
? loXml.GetXml()


release loXml
release loSbFlattened
release loPrivKey
release loRsa