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<p class="MsoNormal">Happy New Year! <o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">I am reaching out to the list about this issue of MD5 vs SHA256 hashes in EPrints.<o:p></o:p></p>
<p class="MsoNormal"><a href="https://emea01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub.com%2Feprintsug%2FEPrintsArchivematica%2Fissues%2F6&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7Cb028a475d4ef4ef6e76508d6774a9d22%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=mJTFt8wQpCNj1VycHlrqiF44fmqkwVfL3eJjsPCq%2BKA%3D&amp;reserved=0" originalSrc="https://github.com/eprintsug/EPrintsArchivematica/issues/6" shash="uKCAiOrrg9rwJfAOlDqSbT8ZZx9Ep4Cs1L1OG88tgRiVhC+CPKPcB11/CMLjK+2bVNvYprHoHc/zie14PaSfEfyGBi3NkgUxKl7iRzErfUo03AejjjEJdBhfox0gts6BqtjvvUcMPLDhurhedC7OYyPpdNSRAry+ojfXuIOxmrE=">https://github.com/eprintsug/EPrintsArchivematica/issues/6</a><o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">Based on digging into our database:<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>EPrints generates file.hash values of file.hash_type MD5 for the following derivative files:<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="font-family:&quot;Courier New&quot;"><span style="mso-list:Ignore">o<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]>indexcodes.txt<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="font-family:&quot;Courier New&quot;"><span style="mso-list:Ignore">o<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]>lightbox.jpg<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="font-family:&quot;Courier New&quot;"><span style="mso-list:Ignore">o<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]>preview.jpg<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="font-family:&quot;Courier New&quot;"><span style="mso-list:Ignore">o<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]>medium.jpg<o:p></o:p></p>
<p class="MsoListParagraph" style="margin-left:72.0pt;text-indent:-18.0pt;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style="font-family:&quot;Courier New&quot;"><span style="mso-list:Ignore">o<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]>small.jpg<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>EPrints generated file.hash value of hash_type MD5 for most (but not all) of the uploaded files (such as PDF files).&nbsp; Some of the older PDF files do not have a file.hash value stored in our database.<o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo1"><![if !supportLists]><span style="font-family:Symbol"><span style="mso-list:Ignore">·<span style="font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]>EPrints did not generate any file.hash values for the dataobj.xml files for the history objects.<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">The EPrints source code includes a function to generate MD5 and SHA256, but it looks like only the MD5 is ever called by default. &nbsp;<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">Are these findings consistent with what you have in your EPrints instance?<o:p></o:p></p>
<p class="MsoNormal">Since we have MD5 by default in EPrints, do you agree that MD5 will be sufficient for the export to Archivematica?<o:p></o:p></p>
<p class="MsoNormal">Does anyone know why some of our uploaded files would have no file.hash?&nbsp; Is that something that could have been caused by a bug EPrints that prevented hashes to be generated, but that was resolved at some point?<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal">Tomasz<o:p></o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
<p class="MsoNormal" style="background:white"><span style="font-size:8.0pt;font-family:&quot;Courier New&quot;;color:#A6A6A6">________________________________________________</span><span style="font-family:&quot;Calibri&quot;,sans-serif;color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:17.85pt;background:white">
<span style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black">Tomasz Neugebauer<br>
Digital Projects &amp; Systems Development Librarian / Bibliot</span><span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black">hécaire des Projets Numériques &amp; Développement de Systèmes<br>
Library / Bibliothèque<br>
Concordia University / Université Concordia</span><span lang="FR-CA" style="font-family:&quot;Calibri&quot;,sans-serif;color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:17.85pt;background:white">
<span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black">Tel. / Tél. 514-848-2424 ext. / poste 7738<br>
Email / courriel:&nbsp;</span><span style="font-family:&quot;Calibri&quot;,sans-serif;color:#212121"><a href="mailto:tomasz.neugebauer@concordia.ca" target="_blank"><span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:windowtext">tomasz.neugebauer@concordia.ca</span></a></span><span lang="FR-CA" style="font-family:&quot;Calibri&quot;,sans-serif;color:#212121"><o:p></o:p></span></p>
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<u><span lang="IT" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:purple"><a href="https://emea01.safelinks.protection.outlook.com/?url=http%3A%2F%2Fwww.concordia.ca%2Ffaculty%2Ftomasz-neugebauer.html&amp;data=01%7C01%7Ceprints-tech%40ecs.soton.ac.uk%7Cb028a475d4ef4ef6e76508d6774a9d22%7C4a5378f929f44d3ebe89669d03ada9d8%7C1&amp;sdata=I%2BzGJFMN3Eb704t2Cp76G2OPeChJNzdpmqaiOJ8iYVI%3D&amp;reserved=0" originalSrc="http://www.concordia.ca/faculty/tomasz-neugebauer.html" shash="VWAIF+ys2wWpLRRpH4GhTUa+MRBg5D8O1iVHAWFGe/nWdA6aSTECCKbElU5+P58oEHfwpbaL6aRPTa0Cs69p2mMaLm4P06440Jg+Lm4YBEkE2h09UGQ+dB6YtOkD9e7Vm3+rWDxl+HJvp522mkgCg0BiC1mVtSq3mFDPJ0/jomo="><span lang="FR-CA" style="color:windowtext">www.concordia.ca/faculty/tomasz-neugebauer.html</span></a></span></u><u><span lang="FR-CA" style="font-family:&quot;Calibri&quot;,sans-serif;color:#212121"><o:p></o:p></span></u></p>
<p class="MsoNormal" style="mso-margin-top-alt:0cm;margin-right:0cm;margin-bottom:12.0pt;margin-left:17.85pt;background:white">
<span lang="FR-CA" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:black">Mailing address / adresse postale:&nbsp;1455 De Maisonneuve Blvd. W.,&nbsp;LB-540-03, Montreal, Quebec H3G 1M8<br>
Street address / adresse municipale: 1400&nbsp;De Maisonneuve Blvd. W.,&nbsp;LB-540-03, Montreal, Quebec H3G 1M8</span><span lang="FR-CA" style="font-family:&quot;Calibri&quot;,sans-serif;color:#212121"><o:p></o:p></span></p>
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<u><span lang="IT" style="font-size:9.0pt;font-family:&quot;Arial&quot;,sans-serif;color:purple">library.concordia.ca<o:p></o:p></span></u></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
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