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POhow to build complete certificate name, include serial number using openssl's index.txt
 

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    <p><strong>Problem Description:</strong> </p> <p>I need to build a regular expression / pattern to find a value that can either be decimal or hex</p> <p><strong>Background Information:</strong> </p> <p>I am trying to build a lua function that will lookup a cert in index.txt and return the serial number. Ultimately, I need to be able to take the full cert name and run the following command: </p> <blockquote> <p>openssl x509 -noout -in /etc/ssl/cert/myusername.6A756C65654063616E2E77746274732E6E6574.8F.crt -dates</p> </blockquote> <p>I have the logic to build the file name, all the way up to the serial number... which in the above example, is 8F.</p> <p>Here's what the index.txt file looks like: </p> <pre><code>R 140320154649Z 150325040807Z 8E unknown /CN=test@gmail.com/emailAddress=test@gmail.com V 160324050821Z 8F unknown /CN=test@yahoo.com/emailAddress=test@yahoo.com V 160324051723Z 90 unknown /CN=test2@yahoo.com/emailAddress=test2@yahoo.com </code></pre> <p>The serial number is field 4 in the first record, and field 3 in the rest of the records. According to the documentation <a href="https://www.openssl.org/docs/apps/x509.html" rel="nofollow">https://www.openssl.org/docs/apps/x509.html</a>, serial number can either be hex or decimal. I'm not quite sure yet how / who determines whether it's hex or decimal (i'm modifying someone else's code that uses openssl)... but I'm wondering if there's a way to check for both. I'll only be checking the value for records that are not Revoked ...aka. ones that do not have "R" in the first column.</p> <p>Thanks.</p>
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