Add PrivateKeyUtil class

Author: peterdettman

tls/src/main/jdk1.5/org/bouncycastle/tls/crypto/impl/jcajce/PrivateKeyUtil.java

@@ -0,0 +1,32 @@
+package org.bouncycastle.tls.crypto.impl.jcajce;
+
+import java.lang.reflect.Method;
+import java.security.PrivateKey;
+
+import org.bouncycastle.tls.ReflectionUtil;
+
+abstract class PrivateKeyUtil
+{
+    private static final Method destroy;
+
+    static
+    {
+        Method[] methods = ReflectionUtil.getMethods("java.security.PrivateKey");
+
+        destroy = ReflectionUtil.findMethod(methods, "destroy");
+    }
+
+    static void destroy(PrivateKey privateKey)
+    {
+        if (destroy != null)
+        {
+            try
+            {
+                ReflectionUtil.invokeMethod(privateKey, destroy);
+            }
+            catch (Exception e)
+            {
+            }
+        }
+    }
+}

tls/src/main/jdk1.9/org/bouncycastle/tls/crypto/impl/jcajce/PrivateKeyUtil.java

@@ -0,0 +1,17 @@
+package org.bouncycastle.tls.crypto.impl.jcajce;
+
+import java.security.PrivateKey;
+
+abstract class PrivateKeyUtil
+{
+    void destroy(PrivateKey privateKey)
+    {
+        try
+        {
+            privateKey.destroy();
+        }
+        catch (Exception e)
+        {
+        }
+    }
+}