RFR: 8254717: isAssignableFrom checks in KeyFactorySpi.engineGetKeySpec appear to be backwards

[Jamil Nimeh]

On Tue, 23 Feb 2021 01:47:48 GMT, Ziyi Luo <luoziyi at openjdk.org> wrote:

> All of the "isAssignableFrom" checks in "engineGetKeySpec" appear to be backwards in Java's KeyFactorySpi.engineGetKeySpec implementations. In most cases, the requested KeySpec is equal to the concrete implementation so the inversion does not matter. But there are few cases, as presented in the added jtreg test, will cause unexpected behavior (e.g., ClassCastException rather than an InvalidKeySpecException). The fix is trivial.
> 
> Co-author @SalusaSecondus

The fix itself makes sense and looks good to me.  However I think it will cause two other tests to break.  Please try running the following two tests with your changes and see if they fail for you as they did for me:
open/test/jdk/sun/security/rsa/TestKeyFactory.java
open/test/jdk/sun/security/rsa/pss/TestPSSKeySupport.java

Also just a minor nit: some of the modified files should have their copyright dates updated to 2021.

test/jdk/java/security/KeyFactory/KeyFactoryGetKeySpecForInvalidSpec.java line 2:

> 1: /*
> 2:  * Copyright (c) 2011, Amazon.com, Inc. or its affiliates. All rights reserved.

Nit: Should this be 2021?

test/jdk/java/security/KeyFactory/KeyFactoryGetKeySpecForInvalidSpec.java line 27:

> 25:  * @test
> 26:  * @bug 8254717
> 27:  * @summary Two users facing implications caused by "isAssignableFrom" checks in "engineGetKeySpec" being backwards.

Nit: I think standard practice is to have the summary be the synopsis from JDK-8254717 (isAssignableFrom checks in KeyFactorySpi.engineGetKeySpec appear to be backwards).

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PR: https://git.openjdk.java.net/jdk/pull/2682