Digest algorithms for Ruby

[Samuel Williams]

I am maintaining the OpenSSL bindings for Ruby, and I'm considering
exposing SHA3 and BLAKE digests.

In addition, for the first time, I wrote some tests to test ALL algorithms
we expose, and found that "DSS", "DSS1" and "SHA" no longer exist.

I'm going to assume this algorithm is removed because it's old and/or
insecure. But I would like to seek some clarification on this because it
represents a breaking change in semantic versioning, to the extent that we
exposed these digests explicitly.

So:

- Did they exist?
- When did they stop existing?
- Are they still relevant?

Kind regards,
Samuel.
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