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Visual FoxPro

SII XML Digital Signature

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Example for SII XML Digital Signature.

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Visual FoxPro 
LOCAL lnSuccess
LOCAL loXmlToSign
LOCAL loGen
LOCAL loXml1
LOCAL loCert
LOCAL loSbXml
LOCAL loVerifier
LOCAL lnNumSigs
LOCAL lnVerifyIdx
LOCAL lnVerified

lnSuccess = 0

lnSuccess = 1

* Load the XML to be signed.
loXmlToSign = CreateObject('Chilkat.Xml')
lnSuccess = loXmlToSign.LoadXmlFile("c:/aaworkarea/eduardo/sii_unsigned.xml")
IF (lnSuccess = 0) THEN
    ? loXmlToSign.LastErrorText
    RELEASE loXmlToSign
    CANCEL
ENDIF

* The sample XML to be signed looks like this:

* <?xml version="1.0" encoding="ISO-8859-1"?>
* <EnvioDTE xmlns="http://www.sii.cl/SiiDte" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.sii.cl/SiiDte EnvioDTE_v10.xsd" version="1.0">
* <SetDTE ID="SetDocF0T33_20240425_170512">
*  <Caratula version="1.0">
*   <RutEmisor>99999999-4</RutEmisor>
*   <RutEnvia>12345678-6</RutEnvia>
*   <RutReceptor>888888000-K</RutReceptor>
*   <FchResol>2014-08-22</FchResol>
*   <NroResol>80</NroResol>
*   <TmstFirmaEnv>2024-04-25T17:05:13</TmstFirmaEnv>
*   <SubTotDTE>
*    <TpoDTE>33</TpoDTE>
*    <NroDTE>1</NroDTE>
*   </SubTotDTE>
*  </Caratula>
* <DTE version="1.0">
* <Documento ID="F555T55">
* ...
* </Documento>
* </EnvioDTE>

loGen = CreateObject('Chilkat.XmlDSigGen')

loGen.SigLocation = "EnvioDTE|SetDTE|DTE"
loGen.SigLocationMod = 0
loGen.SigNamespacePrefix = ""
loGen.SigNamespaceUri = "http://www.w3.org/2000/09/xmldsig#"
loGen.SignedInfoCanonAlg = "C14N"
loGen.SignedInfoDigestMethod = "sha1"

* -------- Reference 1 --------
loXml1 = CreateObject('Chilkat.Xml')
loXml1.Tag = "Transforms"
loXml1.UpdateAttrAt("Transform",1,"Algorithm","http://www.w3.org/TR/2001/REC-xml-c14n-20010315")

loGen.AddSameDocRef2("F511T33","sha1",loXml1,"")

* Provide a certificate + private key. (PFX password is test123)
loCert = CreateObject('Chilkat.Cert')
lnSuccess = loCert.LoadPfxFile("qa_data/pfx/cert_test123.pfx","test123")
IF (lnSuccess <> 1) THEN
    ? loCert.LastErrorText
    RELEASE loXmlToSign
    RELEASE loGen
    RELEASE loXml1
    RELEASE loCert
    CANCEL
ENDIF

loGen.SetX509Cert(loCert,1)

loGen.KeyInfoType = "X509Data+KeyValue"
loGen.X509Type = "Certificate"

* Load XML to be signed...
loSbXml = CreateObject('Chilkat.StringBuilder')
loXmlToSign.GetXmlSb(loSbXml)

loGen.Behaviors = "IndentedSignature"

* Sign the XML...
lnSuccess = loGen.CreateXmlDSigSb(loSbXml)
IF (lnSuccess <> 1) THEN
    ? loGen.LastErrorText
    RELEASE loXmlToSign
    RELEASE loGen
    RELEASE loXml1
    RELEASE loCert
    RELEASE loSbXml
    CANCEL
ENDIF

* -----------------------------------------------

* Save the signed XML to a file.
lnSuccess = loSbXml.WriteFile("c:/temp/qa_output/signedXml.xml","utf-8",0)

? loSbXml.GetAsString()

* ----------------------------------------
* Verify the signatures we just produced...
loVerifier = CreateObject('Chilkat.XmlDSig')
lnSuccess = loVerifier.LoadSignatureSb(loSbXml)
IF (lnSuccess <> 1) THEN
    ? loVerifier.LastErrorText
    RELEASE loXmlToSign
    RELEASE loGen
    RELEASE loXml1
    RELEASE loCert
    RELEASE loSbXml
    RELEASE loVerifier
    CANCEL
ENDIF

lnNumSigs = loVerifier.NumSignatures
lnVerifyIdx = 0
DO WHILE lnVerifyIdx < lnNumSigs
    loVerifier.Selector = lnVerifyIdx
    lnVerified = loVerifier.VerifySignature(1)
    IF (lnVerified <> 1) THEN
        ? loVerifier.LastErrorText
        RELEASE loXmlToSign
        RELEASE loGen
        RELEASE loXml1
        RELEASE loCert
        RELEASE loSbXml
        RELEASE loVerifier
        CANCEL
    ENDIF

    lnVerifyIdx = lnVerifyIdx + 1
ENDDO
? "All signatures were successfully verified."

RELEASE loXmlToSign
RELEASE loGen
RELEASE loXml1
RELEASE loCert
RELEASE loSbXml
RELEASE loVerifier