https://github.com/ruby/openssl/commit/8945f379b3

Since around 2018, we have been using spaces for indentation for newly
added code[1]. The mixed use of tabs and spaces has repeatedly confused
new contributors who configured their editors to use a different tab
size than 8. Since git blame can now skip specific commits, ruby/ruby
did a mass reformatting of tabs in 2022[2]. Do the same in ruby/openssl.

While at it, fix a few indentation issues, mainly in switch-case labels
and in ossl_ssl_session.c, which used doubled indentation size.

This patch contains white-space changes only. git diff -w output should
be empty.

[1] https://bugs.ruby-lang.org/issues/14246
[2] https://bugs.ruby-lang.org/issues/18891

https://github.com/ruby/openssl/commit/4d6214f507

These declarations were added to every source file because older
versions of RDoc did not resolve ancestor tree across files. Since
RDoc 6.9.0 supports this, this workaround is no longer needed.

    https://redirect.github.com/ruby/rdoc/pull/1217

https://github.com/ruby/openssl/commit/6491ce63be

Move attribute documentation out of the class-level section and into
the appropriate sections so that they attach correctly.

https://github.com/ruby/openssl/commit/61410acc50

ruby/openssl exposes OIDs to Ruby as strings in many places, but the
conversion logic has been duplicated and the behavior is inconsistent.
There are mainly two patterns:

 - Returns the short name associated with the OID/NID, or the dotted
   decimal notation if it is unknown to OpenSSL.
 - Returns the long name, or the dotted decimal notation.

These patterns are implemented using different OpenSSL APIs and that
caused subtle differences. Add helper functions ossl_asn1obj_to_string()
and ossl_asn1obj_to_string_long_name() to unify the logic.

Also, document the current behaviors where it is not yet done. The
inconsistency was likely unintentional, but since it dates back to the
original implementations, standardizing it now would cause more issues
than it resolves.

https://github.com/ruby/openssl/commit/2ea36c21a4

obj_to_asn1obj() in ossl_ts.c and ossl_asn1.c are identical. Let's
remove one in ossl_ts.c.

eASN1Error can now be made static to ossl_asn1.c.

https://github.com/ruby/openssl/commit/dcb05c40c2

With the introduction of OpenSSL 3 providers, newly implemented
algorithms do not necessarily have a corresponding NID assigned. To use
such an algorithm, it has to be "fetched" from providers using the new
EVP_*_fetch() functions.

For digest algorithms, we have to use EVP_MD_fetch() instead of the
existing EVP_get_digestbyname(). However, it is not a drop-in
replacement because:

 - EVP_MD_fetch() does not support all algorithm name aliases recognized
   by EVP_get_digestbyname().

 - Both return an EVP_MD, but the one returned by EVP_MD_fetch() is
   sometimes reference counted and the user has to explicitly release
   it with EVP_MD_free().

So, keep using EVP_get_digestbyname() for all OpenSSL versions for now,
and fall back to EVP_MD_fetch() if it fails. In the latter case, prepare
a T_DATA object to manage the fetched EVP_MD's lifetime.

https://github.com/ruby/openssl/commit/9fc2179403

In OpenSSL 3.4, TS_VERIFY_CTX_set_certs() and TS_VERIFY_CTX_set_store()
are deprecated in favor of the new functions with "set0" in the names.

The new functions have a slightly different behavior. They will free the
previous value automatically. Increment the reference counter of
X509_STORE before setting it to TS_VERIFY_CTX, and do not try to
manually unset it.

We avoided doing this to work around a bug that was present in older
versions of OpenSSL, which has now been fixed in OpenSSL 1.0.2 by commit
https://github.com/openssl/openssl/commit/bff9ce4db38b.

https://github.com/ruby/openssl/commit/ce37f7d93a

While the struct is currently still public in OpenSSL, there has been
an accessor since OpenSSL 0.9.8h. It would be nice if this accessor
could be used so that the struct can be made opaque at some point in
the future.

https://github.com/ruby/openssl/commit/812aeab2f5

Drop support for OpenSSL 1.0.2. It has reached upstream EOL in 2019-12.

Most distributions that shipped with OpenSSL 1.0.2 have also reached
EOL, or provide a newer version in the package repository:

 - RHEL 7 (EOL 2024-06)
 - Ubuntu 16.04 LTS (EOL 2021-04)
 - Amazon Linux 2 (EOL 2026-06, but OpenSSL 1.1.1 can be installed via
   the openssl11{,-devel} package)

https://github.com/ruby/openssl/commit/38ec6fd50e