HOW TO SIGN XML FILE IN .NET COMPACT EDITION

[AlexB47]

I need help for sign an XML files with (signature tag). Nothing problem if the platform is a standard PC but in .NET COMPACT FRAMEWORK for windows mobile 6 I have problems. First .. exist Systems.Security in .NET CF? 2.0 or 3.5? Where are? this is my code for Pc ..:

Public Function Firma(ByVal XmlFile as String) As Boolean
Dim signedXML as String = "c:\signedXML.xml"
' setup the document to sign
Dim doc As XmlDocument = New XmlDocument()
doc.Load(XmlFile)
Dim signer As SignedXml = New SignedXml(doc)

'setup the key used to sign 
Dim key As Security.Cryptography.RSA = New Security.Cryptography.RSACryptoServiceProvider()
signer.KeyInfo = New Security.Cryptography.Xml.KeyInfo()

signer.KeyInfo.AddClause(New Security.Cryptography.Xml.RSAKeyValue(key))
signer.SigningKey = key

'create a reference to the root of the document 
Dim orderRef As Security.Cryptography.Xml.Reference = New Security.Cryptography.Xml.Reference("")
orderRef.AddTransform(New Security.Cryptography.Xml.XmlDsigEnvelopedSignatureTransform())
orderRef.DigestMethod = "http://www.w3.org/2001/04/xmlenc#sha256"

signer.AddReference(orderRef)

'add transforms that only select the order items, type, and 
'compute the signature, and add it to the document 
signer.ComputeSignature()
doc.DocumentElement.AppendChild(signer.GetXml())
doc.Save(signedXML)

End Function

Alex