[fix] make sure PKey::EC#dup (copying) works

Author: kares

src/main/java/org/jruby/ext/openssl/PKeyEC.java

@@ -399,6 +399,20 @@ private void setGroup(final Group group) {
         this.curveName = this.group.getCurveName();
     }
 
+    @Override
+    public IRubyObject initialize_copy(final IRubyObject original) {
+        if (this == original) return this;
+        checkFrozen();
+
+        final PKeyEC that = (PKeyEC) original;
+        this.publicKey = that.publicKey;
+        this.privateKey = that.privateKey;
+        this.curveName = that.curveName;
+        this.group = that.group;
+
+        return this;
+    }
+
     //private static ECNamedCurveParameterSpec readECParameters(final byte[] input) throws IOException {
     //    ASN1ObjectIdentifier oid = ASN1ObjectIdentifier.getInstance(input);
     //    return ECNamedCurveTable.getParameterSpec(oid.getId());

src/test/ruby/ec/test_ec.rb

@@ -3,6 +3,50 @@
 
 class TestEC < TestCase
 
+  def test_ec_key
+    builtin_curves = OpenSSL::PKey::EC.builtin_curves
+    assert_not_empty builtin_curves
+
+    builtin_curves.each do |curve_name, comment|
+      # Oakley curves and X25519 are not suitable for signing and causes
+      # FIPS-selftest failure on some environment, so skip for now.
+      next if ["Oakley", "X25519"].any? { |n| curve_name.start_with?(n) }
+
+      key = OpenSSL::PKey::EC.generate(curve_name)
+      assert_predicate key, :private?
+      assert_predicate key, :public?
+      assert_nothing_raised { key.check_key }
+    end
+
+    key1 = OpenSSL::PKey::EC.generate("prime256v1")
+
+    # PKey is immutable in OpenSSL >= 3.0; constructing an empty EC object is deprecated
+    #if !openssl?(3, 0, 0)
+    #   key2 = OpenSSL::PKey::EC.new
+    #   key2.group = key1.group
+    #   key2.private_key = key1.private_key
+    #   key2.public_key = key1.public_key
+    #   assert_equal key1.to_der, key2.to_der
+    #end
+
+    key3 = OpenSSL::PKey::EC.new(key1)
+    assert_equal key1.to_der, key3.to_der
+
+    key4 = OpenSSL::PKey::EC.new(key1.to_der)
+    assert_equal key1.to_der, key4.to_der
+
+    key5 = key1.dup
+    assert_equal key1.to_der, key5.to_der
+
+    # PKey is immutable in OpenSSL >= 3.0; EC object should not be modified
+    #if !openssl?(3, 0, 0)
+      key_tmp = OpenSSL::PKey::EC.generate("prime256v1")
+      key5.private_key = key_tmp.private_key
+      key5.public_key = key_tmp.public_key
+      assert_not_equal key1.to_der, key5.to_der
+    #end
+  end
+
   def test_generate
     assert_raise(OpenSSL::PKey::ECError) { OpenSSL::PKey::EC.generate("non-existent") }
     g = OpenSSL::PKey::EC::Group.new("prime256v1")