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SII Chile - FRMT Signature Computation and Add to XML

See more XML Digital Signatures Examples

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

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

#  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

$xml = New-Object 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>
#                      <FRMA algoritmo="SHA1withRSA">...</FRMA>
#                  </CAF>
#                  ...
#              </DD>
#              ... The FRMT will be added here in another example ...
#          </TED>
#    </Documento>
#  </DTE>

$success = $xml.LoadXmlFile("qa_data/xml_dsig/sii_cl/test_1.xml")
if ($success -eq $false) {
    $("Failed to load initial XML file.")
    exit
}

#  Get a reference to the "DD" element
$ddXml = $xml.FindChild("Documento|TED|DD")
if ($xml.LastMethodSuccess -eq $false) {
    $("Failed to find DD element")
    exit
}

#   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), 
$sbFlattened = New-Object Chilkat.StringBuilder
$ddXml.EmitCompact = $true
$ddXml.EmitXmlDecl = $false
$ddXml.GetXmlSb($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.

$privKey = New-Object Chilkat.PrivateKey
$success = $privKey.LoadAnyFormatFile("qa_data/rsa/rsaPrivKey_pkcs8.pem","")
if ($success -eq $false) {
    $($privKey.LastErrorText)
    exit
}

$rsa = New-Object Chilkat.Rsa
$rsa.UsePrivateKey($privKey)

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

#  Add the FRMT signature element to the XML.
$xml.UpdateChildContent("Documento|TED|FRMT",$sig)
$xml.UpdateAttrAt("Documento|TED|FRMT",$true,"algoritmo","SHA1withRSA")

#  See what we have:
$xml.EmitCompact = $false
$xml.EmitXmlDecl = $true
$($xml.GetXml())