On Thu, 11 Jan 2024 14:09:37 GMT, Sean Mullan <mul...@openjdk.org> wrote:

>> This enhancement simplifies and improves the performance of the Comparator 
>> that the PKIX CertPathBuilder uses to sort candidate certificates.
>> 
>> [RFC 5280](https://www.rfc-editor.org/rfc/rfc5280#section-4.2.1.1) requires 
>> that certificates include authority and subject key identifiers to 
>> facilitate cert path discovery. When the certificates comply with RFC 5280, 
>> the sorting algorithm is fast and efficient. However, there may be cases 
>> where certificates do not include the proper KIDs, for legacy or other 
>> reasons. This enhancement targets those cases and has shown an increase in 
>> performance of `CertPathBuilder.build` by up to 2x in tests involving 
>> certificates that do not contain KIDs. Specific changes include:
>> 
>> - Removed and simplified some of the steps in `PKIXCertComparator.compare` 
>> method. Some of these steps were not a good representation of common 
>> certificate hierarchies and were overly expensive to perform. 
>> - Several methods in `X500Name` and `Builder` have been made obsolete and 
>> thus removed.
>> - `X500Name` has been changed to use shared secrets instead of reflection to 
>> access non-public members of `X500Principal`, and vice-versa.
>> - The `CertificateBuilder` test code has been enhanced to set reasonable 
>> defaults for serial number and validity fields of a certificate
>
> Sean Mullan has updated the pull request incrementally with one additional 
> commit since the last revision:
> 
>   Add more comments. Remove unnecessary import.

src/java.base/share/classes/sun/security/provider/certpath/ForwardBuilder.java 
line 585:

> 583:         }
> 584: 
> 585:         return issuer.size() - anchorRdns.subList(0, i).size();

Is it exactly `issuer.size() - i`?

-------------

PR Review Comment: https://git.openjdk.org/jdk/pull/17248#discussion_r1448958382

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