RFR: 8258588: MD5 MessageDigest in java.util.UUID should be cached

[Sean Mullan]

On Fri, 18 Dec 2020 14:42:38 GMT, PROgrm_JARvis <github.com+7693005+JarvisCraft at openjdk.org> wrote:

> > MD5 and DES were removed as SE requirements in JDK 14. See https://bugs.openjdk.java.net/browse/JDK-8214483 for more information. However, there are no plans to remove the implementations from the JDK at this time.
> 
> In this case, should a bug report be filled to require specifying behaviour for `UUID#nameUUIDFromBytes(byte[])` in case of MD5 not being present?

Perhaps it should throw `UnsupportedOperationException`, but I'll defer to someone who works in this area. It may also be useful to support type 5 UUIDs which use SHA-1.

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PR: https://git.openjdk.java.net/jdk/pull/1821