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X509 serial number using java

Asked 2012-09-25T12:20:24.020
16

I need to get some data from X509 certificate.

If I open a certificate file in windows, its showing its serial number in this format.

ex. 39 65 70 eb d8 9f 28 20 4e c2 a0 6b 98 48 31 0d

The same data I am trying to obtain using java. After get it loaded, I use 

x509.getSerialNumber();
and result is : 76292708057987193002565060032465481997

So what is the difference between both of these ? I want the result as upper one.

java security x509certificate x509 certificate
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1 Answer

2

The first one is hexadecimal value of the certificate. The other one is decimal.

Now it depends on how you convert the initial certificate bytearray for printing it out.

Lets say this is your certificate:

byte[] cert = { (byte) 0xFD, (byte) 0xB1, (byte) 0xDD, ..., (byte) 0x00 };
BigInteger certVal = new BigInteger(cert);  
System.out.println("And result is  (hex): " + certVal.toString(16));
answered 2012-09-25T12:34:47.460

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