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(Classic ASP) Verify HMAC XML Digital SignatureDemonstrates how to validate an XML digital signature signed with an HMAC key.
<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 XML containing the Signature to be verified contains the following: ' <?xml version="1.0" encoding="UTF-8" standalone="no"?> ' <collection Id="root"> ' <album> ' <title>Questions, unanswered</title> ' <artist>Steve and the flubberblubs</artist> ' <year>1989</year> ' <t:tracks xmlns:t="http://test.xades4j/tracks"> ' <t:song length="4:05" tracknumber="1"> ' <t:title>What do you know?</t:title> ' <t:artist>Steve and the flubberblubs</t:artist> ' <t:lastplayed>2006-10-17-08:31</t:lastplayed> ' </t:song> ' <t:song length="3:45" tracknumber="2"> ' <t:title>Who do you know?</t:title> ' <t:artist>Steve and the flubberblubs</t:artist> ' <t:lastplayed>2006-10-17-08:35</t:lastplayed> ' </t:song> ' <t:song length="5:14" tracknumber="3"> ' <t:title>When do you know?</t:title> ' <t:artist>Steve and the flubberblubs</t:artist> ' <t:lastplayed>2006-10-17-08:39</t:lastplayed> ' </t:song> ' <t:song length="4:19" tracknumber="4"> ' <t:title>Do you know?</t:title> ' <t:artist>Steve and the flubberblubs</t:artist> ' <t:lastplayed>2006-10-17-08:44</t:lastplayed> ' </t:song> ' </t:tracks> ' </album> ' <ds:Signature xmlns:ds="http://www.w3.org/2000/09/xmldsig#"><ds:SignedInfo><ds:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/><ds:SignatureMethod Algorithm="http://www.w3.org/2001/04/xmldsig-more#hmac-sha256"/><ds:Reference URI="#root"><ds:Transforms><ds:Transform Algorithm="http://www.w3.org/2000/09/xmldsig#enveloped-signature"/></ds:Transforms><ds:DigestMethod Algorithm="http://www.w3.org/2001/04/xmlenc#sha256"/><ds:DigestValue>rD/g8soqKz8EiPUBhEWfcQacS0ta4ULHX3dKMEH6ZoQ=</ds:DigestValue></ds:Reference></ds:SignedInfo><ds:SignatureValue>R8dXP95VRYJBfL6d0Peogybdk27+R+JIfX8jnVu0NOI=</ds:SignatureValue></ds:Signature></collection> ' The above XML is available at https://www.chilkatsoft.com/exampleData/hmacSigned.xml ' First fetch the XML.. url = "https://www.chilkatsoft.com/exampleData/hmacSigned.xml" ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.Http") set http = Server.CreateObject("Chilkat.Http") ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.StringBuilder") set sbXml = Server.CreateObject("Chilkat.StringBuilder") success = http.QuickGetSb(url,sbXml) If (success <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( http.LastErrorText) & "</pre>" Response.End End If ' For versions of Chilkat < 10.0.0, use CreateObject("Chilkat_9_5_0.XmlDSig") set verifier = Server.CreateObject("Chilkat.XmlDSig") ' Load the XML containing the signature to be verified. success = verifier.LoadSignatureSb(sbXml) If (success <> 1) Then Response.Write "<pre>" & Server.HTMLEncode( verifier.LastErrorText) & "</pre>" Response.End End If ' Provide the HMAC key ' The HMAC key for this signature is the us-ascii bytes of the string "secret", ' It can be set in any of the following ways (and also more ways not shown here..) success = verifier.SetHmacKey("secret","ascii") ' or success = verifier.SetHmacKey("c2VjcmV0","base64") ' or success = verifier.SetHmacKey("736563726574","hex") ' Verify the signature bVerified = verifier.VerifySignature(1) Response.Write "<pre>" & Server.HTMLEncode( "Signature verified = " & bVerified) & "</pre>" %> </body> </html> |
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