test/openssl/test_pkey: use EC keys for PKey.generate_parameters tests

OpenSSL 3.0 refuses to generate DSA parameters shorter than 2048 bits,
but generating 2048 bits parameters takes very long time. Let's use EC
in these test cases instead.

Author: rhenium

test/openssl/test_pkey.rb

@@ -27,20 +27,16 @@ def test_generic_oid_inspect
   end
 
   def test_s_generate_parameters
-    # 512 is non-default; 1024 is used if 'dsa_paramgen_bits' is not specified
-    # with OpenSSL 1.1.0.
-    pkey = OpenSSL::PKey.generate_parameters("DSA", {
-      "dsa_paramgen_bits" => 512,
-      "dsa_paramgen_q_bits" => 256,
+    pkey = OpenSSL::PKey.generate_parameters("EC", {
+      "ec_paramgen_curve" => "secp384r1",
     })
-    assert_instance_of OpenSSL::PKey::DSA, pkey
-    assert_equal 512, pkey.p.num_bits
-    assert_equal 256, pkey.q.num_bits
-    assert_equal nil, pkey.priv_key
+    assert_instance_of OpenSSL::PKey::EC, pkey
+    assert_equal "secp384r1", pkey.group.curve_name
+    assert_equal nil, pkey.private_key
 
     # Invalid options are checked
     assert_raise(OpenSSL::PKey::PKeyError) {
-      OpenSSL::PKey.generate_parameters("DSA", "invalid" => "option")
+      OpenSSL::PKey.generate_parameters("EC", "invalid" => "option")
     }
 
     # Parameter generation callback is called
@@ -59,14 +55,13 @@ def test_s_generate_key
       # DSA key pair cannot be generated without parameters
       OpenSSL::PKey.generate_key("DSA")
     }
-    pkey_params = OpenSSL::PKey.generate_parameters("DSA", {
-      "dsa_paramgen_bits" => 512,
-      "dsa_paramgen_q_bits" => 256,
+    pkey_params = OpenSSL::PKey.generate_parameters("EC", {
+      "ec_paramgen_curve" => "secp384r1",
     })
     pkey = OpenSSL::PKey.generate_key(pkey_params)
-    assert_instance_of OpenSSL::PKey::DSA, pkey
-    assert_equal 512, pkey.p.num_bits
-    assert_not_equal nil, pkey.priv_key
+    assert_instance_of OpenSSL::PKey::EC, pkey
+    assert_equal "secp384r1", pkey.group.curve_name
+    assert_not_equal nil, pkey.private_key
   end
 
   def test_hmac_sign_verify