X509 serial number uses Java

I need to get some data from x509 certificate

If I open a certificate file in windows, its serial number is displayed in this format

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

I'm trying to get the same data using Java After getting it loaded, I use it

x509.getSerialNumber();
and result is : 76292708057987193002565060032465481997

So what's the difference between the two? The result I want is the last one

Solution

Windows displays the hexadecimal representation of the serial number, while Java starts from x509certificate Getserialnumber() returns BigInteger result

To display BigInteger as a hexadecimal value, simply call toString (16)

BigInteger bi = new BigInteger("76292708057987193002565060032465481997");
System.out.println(bi.toString(16));

Output:

396570ebd89f28204ec2a06b9848310d