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(Classic ASP) Verify XML Signature with External URL ReferencesDemonstrates how to verify an XML digital signature that includes references to URLs where the data to be digested is on a web server.
<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> </head> <body> <% ' This example requires the Chilkat API to have been previously unlocked. ' See Global Unlock Sample for sample code. ' The signed XML we wish to verify contains external references such as this: ' <ds:Reference Id="xmldsig-e7ae7ce2-9133-4d56-bd97-0a6aef738cc2-ref0" URI="https://www.chilkatsoft.com/images/starfish.jpg"> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> ' <ds:DigestValue>AOU810yJV5Np/DnO29qpObqiTSTTCDvxGsX5ayiTYXI=</ds:DigestValue> ' </ds:Reference> ' <ds:Reference Id="xmldsig-e7ae7ce2-9133-4d56-bd97-0a6aef738cc2-ref1" URI="https://www.chilkatsoft.com/hamlet.xml"> ' <ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/> ' <ds:DigestValue>4sRRyWOzC7EOic4fQ9+Op1pa10DbgoBGjBvkq09LZmE=</ds:DigestValue> ' </ds:Reference> set verifier = Server.CreateObject("Chilkat_9_5_0.XmlDSig") set http = Server.CreateObject("Chilkat_9_5_0.Http") ' First load the signed XML set sbSignedXml = Server.CreateObject("Chilkat_9_5_0.StringBuilder") success = sbSignedXml.LoadFile("qa_data/xml_dsig_verify/signedWithExternalUrlRefs.xml","utf-8") If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( "Failed to load signed XML.") & "</pre>" Response.End End If success = verifier.LoadSignatureSb(sbSignedXml) If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( verifier.LastErrorText) & "</pre>" Response.End End If ' Iterate over each reference. If it is an external URL reference, download the data and provide it to the verifier. set sbRefUri = Server.CreateObject("Chilkat_9_5_0.StringBuilder") set bd = Server.CreateObject("Chilkat_9_5_0.BinData") numRefs = verifier.NumReferences i = 0 Do While i < numRefs If (verifier.IsReferenceExternal(i) = 1) Then sbRefUri.Clear success = sbRefUri.Append(verifier.ReferenceUri(i)) If (sbRefUri.StartsWith("https://",0) = 1) Then Response.Write "<pre>" & Server.HTMLEncode( "External URL Reference: " & sbRefUri.GetAsString()) & "</pre>" ' Download the data at the URL and provide to the verifier. success = http.DownloadBd(sbRefUri.GetAsString(),bd) If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>" Response.End End If success = verifier.SetRefDataBd(i,bd) If (success = 0) Then Response.Write "<pre>" & Server.HTMLEncode( verifier.LastErrorText) & "</pre>" Response.End End If End If End If i = i + 1 Loop ' Now that we have the external data, verify the signature.. bVerified = verifier.VerifySignature(1) If (bVerified = 0) Then Response.Write "<pre>" & Server.HTMLEncode( verifier.LastErrorText) & "</pre>" End If Response.Write "<pre>" & Server.HTMLEncode( "Signature verified = " & bVerified) & "</pre>" %> </body> </html> |
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