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POget X509Certificate serial number
 

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    <p>I need to get serial number of x509 certificate. The result of usage "certificate.getSerialNumber()" differs from the expected. As I see X509 certificate file specs, it should go in following format:</p> <pre><code> Certificate ::= SEQUENCE { tbsCertificate TBSCertificate, signatureAlgorithm AlgorithmIdentifier, signatureValue BIT STRING } TBSCertificate ::= SEQUENCE { version [0] EXPLICIT Version DEFAULT v1, serialNumber CertificateSerialNumber, signature AlgorithmIdentifier, issuer Name, validity Validity, subject Name, subjectPublicKeyInfo SubjectPublicKeyInfo, issuerUniqueID [1] IMPLICIT UniqueIdentifier OPTIONAL, -- If present, version shall be v2 or v3 subjectUniqueID [2] IMPLICIT UniqueIdentifier OPTIONAL, -- If present, version shall be v2 or v3 extensions [3] EXPLICIT Extensions OPTIONAL -- If present, version shall be v3 } </code></pre> <p>And I couldn't find in the begining of the file the value that is provided by certificate.getSerialNumber() method. </p> <p>And related question: When trying to display the serial with openssl it takes right value from file but adds '3' after each number.</p> <p>So my question is: How can I get the stored serial value? And where to read why and how openssl and java modifies this data.</p> <p><strong>OPENSSL</strong></p> <p>Run with:</p> <pre><code>openssl x509 -serial -noout -inform DER -in mycert.cer </code></pre> <p>Result:</p> <pre><code>serial=3030303031303030303030313030373439323639 </code></pre> <p><strong>JAVA</strong></p> <p>Code:</p> <pre><code>InputStream in = new FileInputStream("mycert.cer"); BouncyCastleProvider provider = new BouncyCastleProvider(); CertificateFactory certificateFactory = CertificateFactory.getInstance("X509", provider); X509Certificate certificate = (X509Certificate) certificateFactory.generateCertificate(in); BigInteger serialNum = certificate.getSerialNumber(); System.out.println(serialNum); </code></pre> <p>Output:</p> <pre><code>275106190557734483187066766755592068430195471929 </code></pre> <p><strong>FILE</strong></p> <p>And viewing the file, I see:</p> <pre><code>0...0..r.......000010000001007492690 . *.H.. .. </code></pre> <p>which seems to be the serial, provided by openssl but openssl mix it with '3'(after each number).</p>
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    1. COFor reference, `0x30` is the ASCII code for '0'. Likewise `0x31` for '1'...all the way up to 0x39.
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