[feat] implement #oid method for PKey classes (#281)

Author: kares

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

@@ -441,6 +441,11 @@ public IRubyObject sysverify(IRubyObject data, IRubyObject sign) {
         }
     }
 
+    @JRubyMethod
+    public IRubyObject oid() {
+        return getRuntime().newString("DSA");
+    }
+
     private DSAKey getDsaKey() {
         DSAKey result;
         return (result = publicKey) != null ? result : privateKey;

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

@@ -542,6 +542,11 @@ public IRubyObject dh_compute_key(final ThreadContext context, final IRubyObject
         }
     }
 
+    @JRubyMethod
+    public IRubyObject oid() {
+        return getRuntime().newString("id-ecPublicKey");
+    }
+
     private Group getGroup(boolean required) {
         if (group == null) {
             if (publicKey != null) {

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

@@ -541,6 +541,11 @@ private RubyString doCipherRSA(final Ruby runtime,
         }
     }
 
+    @JRubyMethod
+    public IRubyObject oid() {
+        return getRuntime().newString("rsaEncryption");
+    }
+
     @JRubyMethod(name="d=")
     public synchronized IRubyObject set_d(final ThreadContext context, IRubyObject value) {
         if ( privateKey != null ) {

src/test/ruby/ec/test_ec.rb

@@ -3,6 +3,11 @@
 
 class TestEC < TestCase
 
+  def test_oid
+    key = OpenSSL::PKey::EC.new
+    assert_equal 'id-ecPublicKey', key.oid
+  end
+
   def test_read_pem
     key_file = File.join(File.dirname(__FILE__), 'private_key.pem')
 

src/test/ruby/rsa/test_rsa.rb

@@ -9,6 +9,11 @@ def setup
     require 'base64'
   end
 
+  def test_oid
+    key = OpenSSL::PKey::RSA.new
+    assert_equal 'rsaEncryption', key.oid
+  end
+
   def test_rsa_private_decrypt
     key_file = File.join(File.dirname(__FILE__), 'private_key.pem')
     base64_cipher = "oj1VB1Lnh6j5Ahoq4dllIXkStZHaT9RvizB0x+yIUDtzi6grSh9vXoCchb+U\nkyLOcMmIXopv1Oe7h2te+XS63AG0EAfUhKTFVDYkm7VmcXue25MPr+P+0w+7\nWjZci4VRBLq3T2qZa3IJhQPsNAtEE1DYXnEjNe0jcFa2bu8TPNscoogo5aAw\nQGT+3cKe7A053czG47Sip7aIo+4NlJHE9kFMOTLaWi3fvv/M9/VKo3Bmm/88\n8Ai09LncNTpq787CRHw/wfjuPlQJOiLt+i7AZHBl6x0jK9bqkhPK5YwP0vmc\nuL52QLzgPxj9E78crg47iJDOgNwU/ux1/VuKnlQ9PQ==\n"