RFR: 8299817: [s390] AES-CTR mode intrinsic fails with multiple short update() calls

[Martin Doerr]

On Thu, 12 Jan 2023 14:29:34 GMT, Lutz Schmidt <lucy at openjdk.org> wrote:

> This PR addresses an issue in the AES-CTR mode intrinsic on s390. When a message is ciphered in multiple, small (< 16 bytes) segments, the result is incorrect.
> 
> This is not just a band-aid fix. The issue was taken as a chance to restructure the code. though still complicated, It is now easier to read and (hopefully) understand.
> 
> Except for the new jetreg test, the changes are purely s390. There are no side effects on other platforms. Issue-specific tests pass. Other tests are in progress. I will update this PR once they are complete. 
> 
> **Reviews and comments are very much appreciated.**
> 
> @backwaterred could you please run some "official" s390 tests? Thanks.

test/hotspot/jtreg/compiler/codegen/aes/Test8299817.java line 4:

> 2:  * Copyright (c) 2022, Oracle and/or its affiliates. All rights reserved.
> 3:  * Copyright (c) 2022 SAP SE. All rights reserved.
> 4:  * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.

Wrong Copyright header! Please also update the Copyright years.

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PR: https://git.openjdk.org/jdk/pull/11967