[ruby/openssl] ssl: remove SSL::SSLContext#tmp_ecdh_callback

The underlying API SSL_CTX_set_tmp_ecdh_callback() was removed by
LibreSSL >= 2.6.1 and OpenSSL >= 1.1.0, in other words, it is not
supported by any non-EOL versions of OpenSSL.

The wrapper was initially implemented in Ruby 2.3 and has been
deprecated since Ruby/OpenSSL 2.0 (bundled with Ruby 2.4) with explicit
warning with rb_warn().

https://github.com/ruby/openssl/commit/ee037e1460

1 files changed, 0 insertions, 24 deletions

diff --git a/test/openssl/test_ssl.rb b/test/openssl/test_ssl.rb
index 59c94932c9..43f1fb901f 100644
--- a/test/openssl/test_ssl.rb
+++ b/test/openssl/test_ssl.rb
@@ -1603,30 +1603,6 @@ end
     end
   end
 
-  def test_tmp_ecdh_callback
-    pend "EC is disabled" unless defined?(OpenSSL::PKey::EC)
-    pend "tmp_ecdh_callback is not supported" unless \
-      OpenSSL::SSL::SSLContext.method_defined?(:tmp_ecdh_callback)
-    pend "LibreSSL 2.6 has broken SSL_CTX_set_tmp_ecdh_callback()" \
-      if libressl?(2, 6, 1)
-
-    EnvUtil.suppress_warning do # tmp_ecdh_callback is deprecated (2016-05)
-      called = false
-      ctx_proc = -> ctx {
-        ctx.ciphers = "DEFAULT:!kRSA:!kEDH"
-        ctx.tmp_ecdh_callback = -> (*args) {
-          called = true
-          OpenSSL::PKey::EC.new "prime256v1"
-        }
-      }
-      start_server(ctx_proc: ctx_proc) do |port|
-        server_connect(port) { |s|
-          assert called, "tmp_ecdh_callback should be called"
-        }
-      end
-    end
-  end
-
   def test_ecdh_curves
     pend "EC is disabled" unless defined?(OpenSSL::PKey::EC)