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POXSLT: Obtaining or matching hashes for base64 encoded data
 

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    <p>I need to find a way to find a way to find the hash for the base64 encoded data in the XML node <strong>//note/resource/data</strong>, or somehow otherwise match it to the hash value in the node <strong>//note/content/en-note//en-media@hash</strong></p> <p><em>See below for the full XML file</em> </p> <p>Please suggest a way to {obtain|match} <strong>using XSLT</strong></p> <pre><code>4aaafc3e14314027bb1d89cf7d59a06c </code></pre> <p>{from|with} </p> <pre><code>R0lGODlhEAAQAPMAMcDAwP/crv/erbigfVdLOyslHQAAAAECAwECAwECAwECAwECAwECAwECAwEC AwECAyH/C01TT0ZGSUNFOS4wGAAAAAxtc09QTVNPRkZJQ0U5LjAHgfNAGQAh/wtNU09GRklDRTku MBUAAAAJcEhZcwAACxMAAAsTAQCanBgAIf8LTVNPRkZJQ0U5LjATAAAAB3RJTUUH1AkWBTYSQXe8 fQAh+QQBAAAAACwAAAAAEAAQAAADSQhgpv7OlDGYstCIMqsZAXYJJEdRQRWRrHk2I9t28CLfX63d ZEXovJ7htwr6dIQB7/hgJGXMzFApOBYgl6n1il0Mv5xuhBEGJAAAOw== </code></pre> <p>This sample XML file has obviously been trimmed for brevity/simplicity. The actual may contain &gt; 1 image per note, therefore the need to obtain/match hashes.</p> <p>The XML file:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE en-export SYSTEM "http://xml.evernote.com/pub/evernote-export.dtd"&gt; &lt;en-export export-date="20091029T063411Z" application="Evernote/Windows" version="3.0"&gt; &lt;note&gt; &lt;title&gt;A title here&lt;/title&gt; &lt;content&gt;&lt;![CDATA[ &lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE en-note SYSTEM "http://xml.evernote.com/pub/enml.dtd"&gt; &lt;en-note bgcolor="#FFFFFF"&gt; &lt;p&gt;Some text here (followed by the picture) &lt;p&gt;&lt;en-media hash="4aaafc3e14314027bb1d89cf7d59a06c" type="image/gif" border="0" width="16" height="16" alt="A picture"/&gt;&lt;/p&gt; &lt;p&gt;Some more text here (preceded by the picture) &lt;/en-note&gt; ]]&gt;&lt;/content&gt; &lt;created&gt;20090925T063154Z&lt;/created&gt; &lt;note-attributes&gt; &lt;author/&gt; &lt;/note-attributes&gt; &lt;resource&gt; &lt;data encoding="base64"&gt; R0lGODlhEAAQAPMAMcDAwP/crv/erbigfVdLOyslHQAAAAECAwECAwECAwECAwECAwECAwECAwEC AwECAyH/C01TT0ZGSUNFOS4wGAAAAAxtc09QTVNPRkZJQ0U5LjAHgfNAGQAh/wtNU09GRklDRTku MBUAAAAJcEhZcwAACxMAAAsTAQCanBgAIf8LTVNPRkZJQ0U5LjATAAAAB3RJTUUH1AkWBTYSQXe8 fQAh+QQBAAAAACwAAAAAEAAQAAADSQhgpv7OlDGYstCIMqsZAXYJJEdRQRWRrHk2I9t28CLfX63d ZEXovJ7htwr6dIQB7/hgJGXMzFApOBYgl6n1il0Mv5xuhBEGJAAAOw== &lt;/data&gt; &lt;mime&gt;image/gif&lt;/mime&gt; &lt;resource-attributes&gt; &lt;file-name&gt;clip_image001.gif&lt;/file-name&gt; &lt;/resource-attributes&gt; &lt;/resource&gt; &lt;/note&gt; &lt;/en-export&gt; </code></pre> <hr /> <h1>Implemented solution</h1> <p>Using concept of the solution suggested by <a href="https://stackoverflow.com/users/91822/jackem">Jackem</a>. The main difference is that I avoid creating my own Java class (and creating an extra dependency). I do the processing within the XSLT, since it's straight forward enough, <em>only referencing</em> external dependencies that come with the basic Java libraries.<br> Jackem's solution is <em>more correct</em> because it doesn't lose the leading zero in some hashes, however I found that it was much easier to take care of this elsewhere using li'l basic hackery.</p> <pre><code>&lt;xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" ... xmlns:md5="java.security.MessageDigest" xmlns:bigint="java.math.BigInteger" exclude-result-prefixes="md5 bigint"&gt; ... &lt;xsl:for-each select="resource"&gt; &lt;xsl:variable name="md5inst" select="md5:getInstance('MD5')" /&gt; &lt;xsl:value-of select="md5:update($md5inst, $b64bin)" /&gt; &lt;xsl:variable name="imgmd5bytes" select="md5:digest($md5inst)" /&gt; &lt;xsl:variable name="imgmd5bigint" select="bigint:new(1, $imgmd5bytes)" /&gt; &lt;xsl:variable name="imgmd5str" select="bigint:toString($imgmd5bigint, 16)" /&gt; &lt;!-- NOTE: $imgmd5str loses the leading zero from imgmd5bytes (if there is one) --&gt; &lt;/xsl:for-each&gt; ... </code></pre> <p>P.S. see <a href="https://stackoverflow.com/questions/1684909/xslt-convert-base64-data-into-image-files">sibling question</a> for my implementation of of the <code>base64--&gt;image file</code> conversion</p> <p><hr /> This question is a subquestion of <a href="https://stackoverflow.com/questions/1642104/evernote-export-format-enex-to-html-including-pictures">another question I have asked previously</a>.</p>
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