OpenSSL "req -x509 -set_serial" - Certificate Serial Number

Q

Can I sign my own CSR with a given serial number using the OpenSSL "req -x509" command?

✍: FYIcenter.com

A

Yes, you can sign you own CSR (Certificate Sign Request) with a given serial number using the OpenSSL "req -x509 -set_serial" command as shown below. Without the "-set_serial" option, the resulting certificate will have random serial number. See the example below:

C:\Users\fyicenter>\local\openssl\openssl.exe

OpenSSL> req -x509 -in rsa_test.csr -key rsa_test.key -out rsa_test.crt 
   -set_serial 1024
Enter pass phrase for rsa_test.key:fyicenter

OpenSSL> x509 -in rsa_test.crt -serial -noout
serial=0400

As you can see the given serial number is stored as a binary integer format. In the above example, 0x0400 = 1024.

⇒ OpenSSL "req -x509 -md5" - MD5 Digest for Signing

⇐ OpenSSL "req -x509 -days" - Longer Self-Signed Certificate

⇑ OpenSSL "req" Command

⇑⇑ OpenSSL Tutorials

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