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Request #53785 Way to query a X.509 certificate fingerprint
Submitted: 2011-01-19 06:38 UTC Modified: 2013-10-08 14:21 UTC
Votes:1
Avg. Score:5.0 ± 0.0
Reproduced:1 of 1 (100.0%)
Same Version:0 (0.0%)
Same OS:0 (0.0%)
From: BenBE at geshi dot org Assigned: mike (profile)
Status: Closed Package: OpenSSL related
PHP Version: 5.3.5 OS: Debian
Private report: No CVE-ID: None
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 [2011-01-19 06:38 UTC] BenBE at geshi dot org 
Description:
------------
When reading a X.509 certificate file (or fetching the certificate from an SSL connection) there is no straight forward way to query the certificate's fingerprint as shown by browsers when viewing the site's certificate.

The output of openssl_x509_parse doesn't contain the fingerprint while openssl_x509_export might contain it in a hard to parse string representation.

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 [2012-01-27 09:29 UTC] msn at searchy dot nl 
The fingerprint is nothing more than the md5 or sha1 sum of the certificate. When you take ther certificate, strip it of the begin and end tag, base64 decode the content and md5 that, you'll get the fingerprint. 

Sample code: 

$newcert = preg_replace("/-----BEGIN CERTIFICATE-----|-----END CERTIFICATE-----/","",$cert); 

$b64 = base64_decode($newcert);
echo "MD5 fingerprint: " . md5($b64) . "\n";
 [2013-10-08 14:21 UTC] mike@php.net
-Status: Open +Status: Closed -Assigned To: +Assigned To: mike
 [2013-10-08 14:21 UTC] mike@php.net 
Feature by Tjerk Meesters in master.
 
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