RFR: 8251216: Implement MD5 intrinsics on AArch64

[Ludovic Henry]

On Wed, 1 Dec 2021 13:25:49 GMT, Andrew Haley <aph at openjdk.org> wrote:

> MD5 has been proven insecure, and its weaknesses have been exploited in the field. It is disabled in many systems. I am surprised that we are thinking of accelerating it for possible future use, and that we're adding a worse-then-useless crypto algorithm to the AArch64 startup.

I wholeheartedly agree with your take. Unfortunately, it's still used on many systems, like for verifying the integrity of downloads ([Azure Blob Storage](https://docs.microsoft.com/en-us/dotnet/api/microsoft.azure.storage.blob.blobproperties.contentmd5?view=azure-dotnet-legacy) for example).

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PR: https://git.openjdk.java.net/jdk/pull/6628