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(Ruby) Create XML Digital Signature using HMAC Key

Demonstrates how to create an XML digital signature using an HMAC key.

Chilkat Ruby Downloads

Ruby Library for Linux and MAC OS X

require 'chilkat'

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

#  Signs the following XML using an HMAC key.

#  <?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>
#  </collection>
# 

#  The above XML is available at https://www.chilkatsoft.com/exampleData/flubberblub.xml
#  Fetch the XML and then sign it..

url = "https://www.chilkatsoft.com/exampleData/flubberblub.xml"
http = Chilkat::CkHttp.new()
sbXml = Chilkat::CkStringBuilder.new()
success = http.QuickGetSb(url,sbXml)
if (success != true)
    print http.lastErrorText() + "\n";
    exit
end

xmlSigGen = Chilkat::CkXmlDSigGen.new()

#  The Signature will be inserted under the "collection" element.
xmlSigGen.put_SigLocation("collection")

#  Sign everything in <collection Id="root"> ... </collection>
xmlSigGen.AddSameDocRef("root","sha256","C14N","","")

#  Specify the HMAC key.
#  For example, if the HMAC key is to be the us-ascii bytes of the string "secret",
#  the HMAC key can be set in any of the following ways (and also more ways not shown here..)
xmlSigGen.SetHmacKey("secret","ascii")
#  or
xmlSigGen.SetHmacKey("c2VjcmV0","base64")
#  or
xmlSigGen.SetHmacKey("736563726574","hex")

#  Sign the XML..
success = xmlSigGen.CreateXmlDSigSb(sbXml)
if (success != true)
    print xmlSigGen.lastErrorText() + "\n";
    exit
end

#  Examine the signed XML:
print sbXml.getAsString() + "\n";

#  The output is:
# 
#  <?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>
# 

 

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