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Visual FoxPro

XML-DSig Add Reference with Transforms Specified Explicitly

Demonstrates how to use the new AddSameDocRef2 method to explicitly specify the XML Transforms fragment.

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LOCAL lnSuccess
LOCAL loXmlToSign
LOCAL loGen
LOCAL loObject1
LOCAL loXml1
LOCAL loCert
LOCAL loSbXml
LOCAL loVerifier
LOCAL lnNumSigs
LOCAL lnVerifyIdx
LOCAL lnVerified

lnSuccess = 0

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

lnSuccess = 1

* Create the following XML to be signed:

* <doc>
*     <s id="s1">Some text...</s>
*     <p>Some text...</p>
*     <p class="note">A note...</p>
* </doc>

* Use this online tool to generate code from sample XML: 
* Generate Code to Create XML

loXmlToSign = CreateObject('Chilkat.Xml')
loXmlToSign.Tag = "doc"
loXmlToSign.UpdateAttrAt("s",1,"id","s1")
loXmlToSign.UpdateChildContent("s","Some text...")
loXmlToSign.UpdateChildContent("p","Some text...")
loXmlToSign.UpdateAttrAt("p[1]",1,"class","note")
loXmlToSign.UpdateChildContent("p[1]","A note...")

? loXmlToSign.GetXml()

loGen = CreateObject('Chilkat.XmlDSigGen')

loGen.SigLocation = "doc"
loGen.SigLocationMod = 0
loGen.SigId = "Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature"
loGen.SigNamespacePrefix = "ds"
loGen.SigNamespaceUri = "http://www.w3.org/2000/09/xmldsig#"
loGen.SigValueId = "Signature-78f29839-06af-448f-b479-ca46457fab1b-SignatureValue"
loGen.SignedInfoCanonAlg = "C14N"
loGen.SignedInfoDigestMethod = "sha1"

* Set the KeyInfoId before adding references..
loGen.KeyInfoId = "Signature-78f29839-06af-448f-b479-ca46457fab1b-KeyInfo"

* The following XML to be added as an Object to the Signature

* Use this online tool to generate code from sample XML: 
* Generate Code to Create XML

* <xades:QualifyingProperties Id="Signature-78f29839-06af-448f-b479-ca46457fab1b-QualifyingProperties" Target="#Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:xades="http://uri.etsi.org/01903/v1.3.2#">
*     <xades:SignedProperties Id="Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties">
*         <xades:SignedSignatureProperties>
*             <xades:SigningTime>TO BE GENERATED BY CHILKAT</xades:SigningTime>
*             <xades:SigningCertificate>
*                 <xades:Cert>
*                     <xades:CertDigest>
*                         <ds:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
*                         <ds:DigestValue>TO BE GENERATED BY CHILKAT</ds:DigestValue>
*                     </xades:CertDigest>
*                     <xades:IssuerSerial>
*                         <ds:X509IssuerName>TO BE GENERATED BY CHILKAT</ds:X509IssuerName>
*                         <ds:X509SerialNumber>TO BE GENERATED BY CHILKAT</ds:X509SerialNumber>
*                     </xades:IssuerSerial>
*                 </xades:Cert>
*             </xades:SigningCertificate>
*         </xades:SignedSignatureProperties>
*         <xades:SignedDataObjectProperties>
*             <xades:DataObjectFormat ObjectReference="#Reference-24eb6003-d41c-442c-a731-d4c58f94790b">
*                 <xades:Description/>
*                 <xades:ObjectIdentifier>
*                     <xades:Identifier Qualifier="OIDAsURN">urn:oid:1.2.840.10003.5.109.10</xades:Identifier>
*                     <xades:Description/>
*                 </xades:ObjectIdentifier>
*                 <xades:MimeType>text/xml</xades:MimeType>
*                 <xades:Encoding/>
*             </xades:DataObjectFormat>
*         </xades:SignedDataObjectProperties>
*     </xades:SignedProperties>
* </xades:QualifyingProperties>

loObject1 = CreateObject('Chilkat.Xml')
loObject1.Tag = "xades:QualifyingProperties"
loObject1.AddAttribute("Id","Signature-78f29839-06af-448f-b479-ca46457fab1b-QualifyingProperties")
loObject1.AddAttribute("Target","#Signature-78f29839-06af-448f-b479-ca46457fab1b-Signature")
loObject1.AddAttribute("xmlns:ds","http://www.w3.org/2000/09/xmldsig#")
loObject1.AddAttribute("xmlns:xades","http://uri.etsi.org/01903/v1.3.2#")
loObject1.UpdateAttrAt("xades:SignedProperties",1,"Id","Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties")
loObject1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningTime","TO BE GENERATED BY CHILKAT")
* Note: It may be that http://www.w3.org/2001/04/xmlenc#sha256 is needed in the following line instead of http://www.w3.org/2000/09/xmldsig#sha1
loObject1.UpdateAttrAt("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestMethod",1,"Algorithm","http://www.w3.org/2000/09/xmldsig#sha1")
loObject1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:CertDigest|ds:DigestValue","TO BE GENERATED BY CHILKAT")
loObject1.UpdateChildContent("xades:SignedProperties|xades:SignedSignatureProperties|xades:SigningCertificateV2|xades:Cert|xades:IssuerSerialV2","TO BE GENERATED BY CHILKAT")
loObject1.UpdateAttrAt("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat",1,"ObjectReference","#Reference-24eb6003-d41c-442c-a731-d4c58f94790b")
loObject1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Description","")
loObject1.UpdateAttrAt("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier",1,"Qualifier","OIDAsURN")
loObject1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Identifier","urn:oid:1.2.840.10003.5.109.10")
loObject1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:ObjectIdentifier|xades:Description","")
loObject1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:MimeType","text/xml")
loObject1.UpdateChildContent("xades:SignedProperties|xades:SignedDataObjectProperties|xades:DataObjectFormat|xades:Encoding","")

? loObject1.GetXml()

loGen.AddObject("",loObject1.GetXml(),"","")

* -------- Reference 1 --------

* Create the following Transforms fragment:

* Use this online tool to generate code from sample XML: 
* Generate Code to Create XML

* <ds:Transforms>
*     <ds:Transform Algorithm="http://www.w3.org/TR/2001/REC-xml-c14n-20010315"/>
*     <ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/>
*     <ds:Transform Algorithm="http://www.w3.org/TR/1999/REC-xpath-19991116">
*         <ds:XPath xmlns:ds="http://www.w3.org/2000/09/xmldsig#">not(ancestor-or-self::ds:Signature)</ds:XPath>
*     </ds:Transform>
* </ds:Transforms>

loXml1 = CreateObject('Chilkat.Xml')
loXml1.Tag = "ds:Transforms"
loXml1.UpdateAttrAt("ds:Transform",1,"Algorithm","http://www.w3.org/TR/2001/REC-xml-c14n-20010315")
loXml1.UpdateAttrAt("ds:Transform[1]",1,"Algorithm","http://www.w3.org/2000/09/xmldsig#enveloped-signature")
loXml1.UpdateAttrAt("ds:Transform[2]",1,"Algorithm","http://www.w3.org/TR/1999/REC-xpath-19991116")
loXml1.UpdateAttrAt("ds:Transform[2]|ds:XPath",1,"xmlns:ds","http://www.w3.org/2000/09/xmldsig#")
loXml1.UpdateChildContent("ds:Transform[2]|ds:XPath","not(ancestor-or-self::ds:Signature)")

* This is the "Transforms" XML fragment passed to AddSameDocRef2.
? loXml1.GetXml()

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

loGen.SetRefIdAttr("","Reference-24eb6003-d41c-442c-a731-d4c58f94790b")

* -------- Reference 2 --------
loGen.AddObjectRef("Signature-78f29839-06af-448f-b479-ca46457fab1b-SignedProperties","sha1","","","http://uri.etsi.org/01903#SignedProperties")

* -------- Reference 3 --------
loGen.AddSameDocRef("Signature-78f29839-06af-448f-b479-ca46457fab1b-KeyInfo","sha1","","","")

* 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 loObject1
    RELEASE loXml1
    RELEASE loCert
    CANCEL
ENDIF

loGen.SetX509Cert(loCert,1)

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

* 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 loObject1
    RELEASE loXml1
    RELEASE loCert
    RELEASE loSbXml
    CANCEL
ENDIF

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

* Save the signed XML to a file.
lnSuccess = loSbXml.WriteFile("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 loObject1
    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 loObject1
        RELEASE loXml1
        RELEASE loCert
        RELEASE loSbXml
        RELEASE loVerifier
        CANCEL
    ENDIF

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

RELEASE loXmlToSign
RELEASE loGen
RELEASE loObject1
RELEASE loXml1
RELEASE loCert
RELEASE loSbXml
RELEASE loVerifier