Hello trid users,
some days ago just for interest i inspect my server directories. Such
samples with CSR file name extension are Certificate Signing Requests.
All my inspected examples are described as "Unknown!" by trid (See appended
output/trid.txt).
For comparison reasons i also run other identifying tools on such examples.
The file command identifies these examples as "PEM certificate request" (See
appended output/file-5.39.txt).
So i run tridscan on these 10 undetected samples and i generate the trid
definition file csr.trid.xml. All my samples still start with typical ASCII
phrase. That is expressed inside Front Block by XML construct like:
<Bytes>2D2D2D2D2D424547494E20434552544946494341544520524551554553542D2D2D2D2D0A4D4949</Bytes>
<ASCII> - - - - - B E G I N C E R T I F I C A T E R E Q U E S T - - - - - . M I I</ASCII>
<Pos>0</Pos>
The request block contains ASCII lines with a fixed record length. Each line
is terminates with a line feed character. That is expressed by lines like:
<Pattern>
<Bytes>0A</Bytes>
<Pos>100</Pos>
</Pattern>
<Pattern>
<Bytes>0A</Bytes>
<Pos>165</Pos>
</Pattern>
The request block is terminated with a typical ASCII line. That is expressed
inside global strings section by line like:
<String>-----END CERTIFICATE REQUEST-----</String>
Some short pattern are probably generated by lucky circumstances. So i
deleted such patterns like:
<Pattern>
<Bytes>43</Bytes>
<ASCII> C</ASCII>
<Pos>42</Pos>
</Pattern>
<Pattern>
<Bytes>41</Bytes>
<ASCII> A</ASCII>
<Pos>48</Pos>
</Pattern>
Because such CSR file format is pure text, the file command use mime type
"text/plain" (see appended output/file-i-5.39.txt). But the CSR format gets
an own official mime type. That is expressed by line like:
<Mime>application/pkcs10</Mime>
Some information about that file format can be found on file formats archive
team web site. That is now expressed by reference line like:
<RefURL>
http://fileformats.archiveteam.org/wiki/PKCS10</RefURL>
With the 1 new now Certificate Signing Requests are now recognized (See
appended output/trid-v-new.txt).
TrID definition, some examples and output are stored in archive csr.zip. I
hope that my 1 XML file can be used in future version of triddefs.
With best wishes
Jörg Jenderek
