Classic ASP
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.
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Classic ASP
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body>
<%
success = 0

' 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

set xml = Server.CreateObject("Chilkat.Xml")

' 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.LoadXmlFile("qa_data/xml_dsig/sii_cl/test_0.xml")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to load initial XML file.") & "</pre>"
    Response.End
End If

' Get a reference to the "DA" element
' daXml is a Chilkat.Xml
Set daXml = xml.FindChild("Documento|TED|DD|CAF|DA")
If (xml.LastMethodSuccess = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( "Failed to find DA element") & "</pre>"
    Response.End
End If

'  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), 
set sbFlattened = Server.CreateObject("Chilkat.StringBuilder")
daXml.EmitCompact = 1
daXml.EmitXmlDecl = 0
success = daXml.GetXmlSb(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.

set privKey = Server.CreateObject("Chilkat.PrivateKey")
success = privKey.LoadAnyFormatFile("qa_data/rsa/rsaPrivKey_pkcs8.pem","")
If (success = 0) Then
    Response.Write "<pre>" & Server.HTMLEncode( privKey.LastErrorText) & "</pre>"
    Response.End
End If

set rsa = Server.CreateObject("Chilkat.Rsa")
success = rsa.UsePrivateKey(privKey)

rsa.EncodingMode = "base64"
rsa.Charset = "iso-8859-1"
sig = rsa.SignStringENC(sbFlattened.GetAsString(),"sha1")

' Add the FRMA signature element to the XML.
xml.UpdateChildContent "Documento|TED|DD|CAF|FRMA",sig
success = xml.UpdateAttrAt("Documento|TED|DD|CAF|FRMA",1,"algoritmo","SHA1withRSA")

' See what we have:
xml.EmitCompact = 0
xml.EmitXmlDecl = 1
Response.Write "<pre>" & Server.HTMLEncode( xml.GetXml()) & "</pre>"

success = xml.SaveXml("qa_data/xml_dsig/sii_cl/test_1.xml")

%>
</body>
</html>