[Feature #10452][ruby-core:66001][ci skip]
* remove HMAC from list of digest algorithms,
* add MD5 in list of digest algorithms,
* add information about writing a C digest implementation using Digest::Base,
* add documentation for Digest::Base public methods.
* ext/digest/md5/md5init.c: add examples for MD5.
* ext/digest/rmd160/rmd160init.c: add examples for Digest::RMD160.
* ext/digest/sha1/sha1init.c: add examples for Digest::SHA1.
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in documentation examples. Patch by naleski via
https://github.com/ruby/ruby/pull/115
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rb_ to avoid name clash in writing extensions.
* ext/digest: Introduce Digest::Class and Digest::Instance for
ease of implementing subclasses and add-ons, inspried by
gotoyuzo.
* ext/digest: The Digest::Instance module now requires and assumes
that any instance be resettable and clonable, and add some
convenient instance methods such as "new()", for creating a new
copy, parameter taking "digest()" and "hexdigest()", for instant
calculation. These methods make digest instances work just like
digest classes.
* ext/digest/sha2/lib/digest/sha2.rb:
Add the Digest::SHA2 class to wrap up SHA2 variants: SHA256,
SHA384 and SHA512, hoping this module would make a decent
example of a digest subclass written in Ruby.
* ext/digest/lib/digest.rb: Adjust autoload entries for SHA2
classes.
* ext/digest/lib/digest/hmac.rb: Follow the framework updates.
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