Hi Xuelei,

Can you elaborate under what circumstances this is useful for testing? X.509 v3 was first published in 1996, and v1 certificates should be pretty much non-existent these days (although there are some root certs that are still v1). v1 certificates do not support extensions. Adding support may cause users to (accidentally) start using them in practice, which would not be good. PKIX (RFC 3280) states that "Conforming implementations may choose to reject all version 1 and version 2 intermediate certificates." (RFC 5280, section 6.1.4 step k).

Thanks,
Sean

On 05/17/2016 12:44 AM, Wang Weijun wrote:
https://bugs.openjdk.java.net/browse/JDK-8157109 filed.

--Max

On May 17, 2016, at 12:25 PM, Xuelei Fan <xuelei....@oracle.com> wrote:

Hi,

Keytool used to generate version 1 self-signed certificates.  Now it is
mandatory to be version 3.  Default version 3 should be OK.  However, in
some circumstances (for example for testing purpose), version 1
self-signed certificate may still be useful.

It would be a low priority, but may be nice to add an option to support
specified certificate version number for certificate generation.

Thanks,
Xuelei

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