Certificate serialnumber?

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On 05.07.2015 14:19, David Thompson wrote:
> Quoting the man page for req(1) -- although depending on the packaging
> which I don't know for CentOS it may be a different section like 1s or 1ssl --
> and also on the web https://www.openssl.org/docs/apps/req.html
>
> -x509
>      this option outputs a self signed certificate instead of a certificate request.
> This is typically used to generate a test certificate or a self signed root CA.
> The extensions added to the certificate (if any) are specified in the
> configuration file. Unless specified using the set_serial option,
> a large random number will be used for the serial number.
>
>> would this be also an option when using openssl like this:
>>
>> openssl ca -batch -config any.cnf -name any_ca -md sha256 -startdate
>> ...  -enddate ... ....
>>
> 'ca' always uses the value currently in a 'serial' file configured in the
> configuration file, and increments it, thus using sequential numbers
> when you issue more than one cert.
as you above, "Unless specified using the set_serial option, ..."
is it the same with 'serial' file when using openssl ca ...?
I mean, would the serial be random,
when there is no 'serial' file specified, neither in the openssl.cnf nor 
at the command parameters ...

Thanks,
Walter


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