How to use the Reference in an XML signature?

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Questions about System.Security.Cryptography.Xml.Reference :

  • What exactly is it for?
  • How should I use the Reference? What to assign to it?
  • Do I need to use this in the signature of an XML Pq?
  • And how to use?

    • What to do here? 

    Dim reference As New Reference()
reference.Uri = ???
        
    asked by anonymous 02.04.2015 / 14:24

    1 answer

    1
  • The Reference represents the element of a digital signature of the XML defined by the specification of the digital signature (www.w3.org/TR/xmldsig-core /).

  • Some available properties font: MSDN:
    DigestMethod: Gets or sets the Digest URI Uniform Resource Identifier method.
    DigestValue: > Gets or sets the digest value of the current Reference . Id: . TransformChain Gets the transformation string of the current Reference . Type: Gets or sets the object type which is being signed. Uri: Gets or sets the Uri of the current Reference .

  • Yes together other classes, for example SignedXml . Because unsigned NFe is simply not accepted by SEFAZ.

  • Example: 

    ' Create a new XML document.
Dim doc As New XmlDocument()

' Format the document to ignore white spaces.
doc.PreserveWhitespace = False

' Load the passed XML file using it’s name.
doc.LoadXml(xmlString)

Dim tagAss = "infNFe"
Dim ref As New Reference()
Dim _Uri As XmlAttributeCollection = doc.GetElementsByTagName(tagAss).Item(0).Attributes
For Each atributo As XmlAttribute In _Uri
  If atributo.Name = "Id" Then
      ref.Uri = "#" & atributo.InnerText
  End If
Next

' Add an enveloped transformation to the reference.
Dim Envelope As New XmlDsigEnvelopedSignatureTransform()
Referencia.AddTransform(Envelope)

Dim c14 As New XmlDsigC14NTransform()
ref.AddTransform(c14)

' Add the reference to the SignedXml object.
signedXml.AddReference(ref)

' Create a new KeyInfo object
Dim keyInfo As New KeyInfo()

' Load the certificate into a KeyInfoX509Data object
' and add it to the KeyInfo object.
keyInfo.AddClause(New KeyInfoX509Data(_X509Cert))

' Add the KeyInfo object to the SignedXml object.
signedXml.KeyInfo = keyInfo
signedXml.ComputeSignature()

' Get the XML representation of the signature and save
' it to an XmlElement object.
Dim xmlDigitalSignature As XmlElement = signedXml.GetXml()

' Gravar assinatura no documento XML
doc.DocumentElement.AppendChild(doc.ImportNode(xmlDigitalSignature,True))
XMLDoc = New XmlDocument()
XMLDoc.PreserveWhitespace = False
XMLDoc = doc 
dim xmlAssinado = XMLDoc.OuterXml
    • 02.04.2015 / 18:02
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